NR3012 [MAXIM]
PMIC with Integrated Charger and Smart Power Selector for Handheld Devices; PMIC集成充电器和智能电源选择器的手持设备
| 型号： | NR3012 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | PMIC with Integrated Charger and Smart Power Selector for Handheld Devices |
| 文件： | 总44页 (文件大小：829K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0885; Rev 0; 8/07
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
General Description
Features
The MAX8671X integrated power-management IC
(PMIC) is ideal for use in portable media players and
other handheld devices. In addition to five regulated
output voltages, the MAX8671X integrates a 1-cell lithi-
um ion (Li+) or lithium polymer (Li-Poly) charger and
Smart Power Selector™ with dual (AC-to-DC adapter
and USB) power inputs. The dual-input Smart Power
Selector supports end products with dual or single
power connectors. All power switches for charging and
switching the system load between battery and external
power are included on-chip. No external MOSFETs are
required.
♦ 16V-Tolerant USB and DC Inputs
♦ Automatically Powers from External Power or
Battery
♦ Operates with No Battery Present
♦ Single-Cell Li+/Li-Poly Charger
♦ Three 2MHz Step-Down Regulators
Up to 96% Efficiency
♦ Two Low I Linear Regulators
Q
♦ Output Power-Up Sequencing
♦ Thermal-Overload Protection
Maxim’s Smart Power Selector makes the best use of
limited USB or AC-to-DC adapter power. Battery
charge current and input current limit are independent-
ly set. Input power not used by the system charges the
battery. Charge current and DC current limit are pro-
grammable up to 1A while USB input current can be set
to 100mA or 500mA. Automatic input selection switches
the system load from battery to external power. Other
features include overvoltage protection, charge status
and fault outputs, power-OK monitors, charge timer,
and battery thermistor monitor. In addition, on-chip
thermal limiting reduces battery charge rate to prevent
charger overheating.
Ordering Information
PKG
CODE
PART
TEMP RANGE PIN-PACKAGE
40 Thin QFN-EP*
5mm x 5mm
MAX8671XETL+ -40°C to +85°C
T4055-1
+Denotes a lead-free package.
*EP = Exposed paddle.
Simplified Applications Circuit
The MAX8671X offers adjustable voltages for all out-
puts. Similar parts with factory-preset output voltages
are also available (contact factory for availability).
MAX8671X
DC
SYS
AC-TO-DC
ADAPTER
Applications
Portable Audio Players
GPS Portable Navigators
USB
USB
+
Li+/LiPo
BATTERY
ON
EN
OFF
OUT1
1V TO V
425mA
OUT1
OUT2
OUT3
SYS
SYS
SYS
PWM
OUT2
1V TO V
425mA
PEN1
PEN2
USUS
CEN
OUT3
1V TO V
425mA
μP
OUT4
0.6V TO V
180mA
CST1
CST2
DOK
OUT4
OUT5
SYS
UOK
OUT5
0.6V TO V
SYS
180mA
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table of Contents
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Simplified Applications Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Smart Power Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
System Load Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USB Power Input (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USB Power-OK Output (UOK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
USB Suspend (USUS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DC Power Input (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DC Power-OK Output (DOK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Battery Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Battery Regulation Voltage (BVSET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Charge Enable Input (CEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Charge Status Outputs (CST1, CST2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Charge Timer (CT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Setting The Charger Currents (CISET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Step-Down Converters (REG1, REG2, REG3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Dropout and Minimum Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Input Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Output Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Step-Down Converter Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Linear Regulators (REG4, REG5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
VL Linear Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Enable/Disable (EN) and Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Soft-Start/Inrush Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Active Discharge in Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Undervoltage and Overvoltage Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
USB/DC UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
USB/DC OVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SYS UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
REG4/REG5 UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Thermal Limiting and Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Smart Power Selector Thermal-Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Regulator Thermal-Overload Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Battery Charger Thermistor Input (THM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
PCB Layout and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Chip Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
MA8671X
2
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Table of Contents (continued)
Tables
Table 1. Input Limiter Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 2. DC Current Limit for Standard Values of R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DISET
Table 3. Charge Status Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 4. Charge Times vs. C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
CT
Table 5. Ideal Charge Currents vs. Charge Setting Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 6. Suggested Inductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 7. 5mm x 5mm x 0.8mm Thin QFN Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 8. Trip Temperatures for Different Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figures
Figure 1. MAX8671X Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 2. Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3. USB Power-OK Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4. Programming DC Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 5. DC Power-OK Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 6. Li+/Li-Poly Charge Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 7. Charger State Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 8. Programming Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 9. Monitoring the Battery Charge Current with the Voltage from CISET to AGND . . . . . . . . . . . . . . . . . . 32
Figure 10. Step-Down Converter Maximum Output Current Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 11. Enable/Disable Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 12. Enable and Disable Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 13. REG5 Disable Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 14. Thermistor Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 15. Package Marking Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
_______________________________________________________________________________________
3
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ABSOLUTE MAXIMUM RATINGS
USB, DC, PEN1 to AGND.......................................-0.3V to +16V
SYS, BAT, PV1, PV2, PV3 to AGND..........................-0.3V to +6V
PG1, PG2, PG3, AGND .........................................-0.3V to +0.3V
PV1, PV2, PV3 to SYS............................................-0.3V to +0.3V
VL to AGND...........................................................-0.3V to +4.0V
OUT5, FB5 to AGND .................................-0.3V to (V
+ 0.3V)
PV5
LX1, LX2, LX3 Continuous RMS Current (Note 1).................1.5A
BAT Continuous Current .......................................................1.5A
SYS Continuous Current .......................................................1.5A
Continuous Power Dissipation (T = +70°C)
A
CISET, DISET, BVSET, CT, THM to AGND..-0.3V to (V + 0.3V)
40-Pin, 5mm x 5mm, Thin QFN (derate 35.7mW/°C
VL
PV4, PV5, BP, FB1, FB2, FB3 to AGND ....-0.3V to (V
+ 0.3V)
above +70°C)..............................................................2857mW
Operating Junction Temperature.....................................+150°C
Storage Junction Temperature Range ..............-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
SYS
PEN2, USUS, CEN, EN, PWM to AGND ..................-0.3V to +6V
CST1, CST2, DOK, UOK to AGND...........................-0.3V to +6V
OUT4, FB4 to AGND .................................-0.3V to (V
+ 0.3V)
PV4
MA8671X
Note 1: LX_ has internal clamp diodes to PG_ and PV_. Applications that forward bias these diodes must take care not to exceed
the package power dissipation limits.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC POWER INPUT (V
= 5.0V, EN = low)
DC
Operating voltage
Withstand voltage
4.1
0
6.6
14
DC Voltage Range
V
V
V
DC
V
= 6V, USUS = low, CEN = high, system
DC
SYS Regulation Voltage
V
5.2
5.3
5.4
SYS_REG
current is less than the input current limit
DC Undervoltage Threshold
DC Overvoltage Threshold
V
V
V
rising, 500mV typical hysteresis
rising, 400mV typical hysteresis
PEN1 = low,
3.95
6.8
4.00
6.9
4.05
7.0
V
V
DCL
DC
DC
V
DCH
90
95
100
500
PEN2 = low,
USUS = low
PEN1 = low,
PEN2 = high,
USUS = low
PEN1 = high,
V
= 6V, V
= 5V
SYS
DC
USB unconnected,
CEN = low,
DC Current Limit
I
mA
DCLIM
T
= +25°C,
450
475
A
VL = no load
(Note 3)
950
3
1000
1050
6
R
= 3kΩ
DISET
R
Resistance Range
kΩ
DISET
PEN1 = low, USUS = high
0.11
1.1
USUS = low, CEN = low;
I
= 0mA, I
= 0mA, EN = low;
BAT
SYS
DC Quiescent Current
I
mA
DCIQ
VL no load
USUS = low, CEN = high;
0.7
15
I
= 0mA, V = 0V, VL no load
EN
SYS
Minimum DC-to-BAT Voltage
Headroom
V
falling, 200mV hysteresis
0
0
30
mV
DC
Minimum DC-to-SYS Voltage
Headroom
V
V
falling, 200mV hysteresis
15
30
mV
DC
DC
DC-to-SYS Dropout Resistance
R
DS
= 5V, I
= 400mA, USUS = low
0.325
0.600
Ω
SYS
4
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.0
35
MAX
UNITS
ms
Starting DC when no USB present
Starting DC with USB present
DC-to-SYS Soft-Start Time
t
SS-D-S
µs
Die temperature at which current limit is
reduced
DC Thermal-Limit Temperature
DC Thermal-Limit Gain
+100
5
°C
Amount of input current reduction above
thermal-limit temperature
%/°C
USB POWER INPUT (V
= 5.0V, EN = low)
USB
Operating voltage
Withstand voltage
4.1
0
6.6
14
USB Voltage Range
V
V
V
USB
V
= 6V, USUS = low, CEN = high,
USB
SYS Regulation Voltage
V
system current is less than the input current
limit
5.2
5.3
5.4
SYS_REG
USB Undervoltage Threshold
USB Overvoltage Threshold
V
V
V
rising, 500mV hysteresis
rising, 400mV hysteresis
3.95
6.8
4.0
6.9
4.05
7.0
V
V
USBL
USB
USB
V
USBH
PEN2 = low,
USUS = low
V
= 6V, V
= 5V, DC
SYS
USB
90
95
100
500
unconnected, CEN = low,
USB Current Limit
I
mA
USBLIM
T
A
= +25°C,
= 0A (Note 3)
PEN2 = high,
USUS = low
450
475
0.11
1.1
I
VL
USUS = high
USUS = low, CEN = low;
2.0
1.3
30
I
= 0mA, I
= 0mA, VL no load
BAT
USB Quiescent Current
I
SYS
mA
USBIQ
USUS = low, CEN = high;
= 0mA, VL no load
0.7
15
15
I
SYS
Minimum USB-to-BAT Voltage
Headroom
V
falling, 200mV hysteresis
falling, 200mV hysteresis
0
0
mV
mV
USB
Minimum USB-to-SYS Voltage
Headroom
V
V
30
USB
USB
USB-to-SYS Dropout Resistance
USB-to-SYS Soft-Start Time
R
US
= 5V, I
= 400mA, USUS = low
0.325
1.0
0.600
Ω
SYS
t
ms
SS-U-S
Die temperature at which current limit is
reduced
USB Thermal-Limit Temperature
USB Thermal-Limit Gain
100
5
°C
Amount of input current reduction above
thermal-limit temperature
%/°C
SYSTEM (V
= 5.0V, EN = low)
DC
System Operating Voltage Range
System Undervoltage Threshold
V
2.6
5.5
V
V
SYS
V
SYS falling, 100mV hysteresis
2.45
2.50
2.55
UVLO_SYS
_______________________________________________________________________________________
5
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
BAT is sourcing
105mA
MIN
TYP
MAX
UNITS
65
82
115
BAT-to-SYS Reverse Regulation
Voltage
DC or USB and BAT
are sourcing current
V
mV
BSREG
BAT is sourcing
905mA
130
0
MA8671X
DC and USB unconnected, EN = low,
10
10
V
= 4V
BAT
V
= V
= 5V, USUS = high,
USB
DC
0
PEN1 = low, EN = low, V
= 4V
BAT
DC and USB unconnected, EN = high,
= 4V (step-down converters are not in
dropout), PWM = low (Note 4)
I
I
I
I
I
+
+
+
+
+
PV1
PV2
PV3
PV4
PV5
I
155
425
285
V
BAT
µA
Quiescent Current
DC and USB unconnected, EN = high,
V
= 2.8V (at least one step-down
550
320
BAT
converter is in dropout), PWM = low (Note 4)
SYS
V
V
= V
= 5V, USUS = high, EN = high,
USB
DC
180
9
= 4V, PWM = low (Note 4)
BAT
DC and USB unconnected, EN = high,
mA
V
= 4.0V, PWM = high
BAT
BATTERY CHARGER (V
= 5.0V, EN = low)
DC
BAT-to-SYS On-Resistance
R
V
= 0V, V
= 4.2V, I = 1A
SYS
0.08
4.200
4.200
4.100
4.100
4.350
4.350
-120
0.16
4.221
4.242
4.121
4.141
4.376
4.398
-70
Ω
BS
USB
BAT
T
A
= +25°C
4.174
4.145
4.073
4.047
4.325
4.297
-170
BVSET = VL or
BVSET unconnected
T
T
T
T
T
= -40°C to +85°C
= +25°C
A
A
A
A
A
BAT Regulation Voltage
(Figure 6)
BVSET = AGND
V
V
BATREG
= -40°C to +85°C
= +25°C
R
= 49.9kΩ to
BVSET
AGND
= -40°C to +85°C
BAT Recharge Threshold
V
(Note 5)
mV
V
BATRCHG
BAT Prequalification Threshold
V
V
rising, 180mV hysteresis, Figure 6
BAT
2.9
3.0
3.1
BATPRQ
Guaranteed by BAT fast-charge current
limit
R
Resistance Range
3
15
kΩ
CISET
CISET Voltage
V
R
= 7.5kΩ, I = 267mA, Figure 9
BAT
0.9
1.0
1.1
V
CISET
CISET
6
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Low-power USB charging from the USB
MIN
TYP
MAX
UNITS
87
92
100
input, DC unconnected, R
PEN2 = low, USUS = low
= 3kΩ,
CISET
Low-power USB charging from the DC
input, R = 3kΩ, PEN1 = low,
PEN2 = low, USUS = low
87
92
100
500
500
230
425
850
CISET
High-power USB charging from the USB
input, DC unconnected, R
PEN2 = high, USUS = low
= 3kΩ,
450
450
170
375
750
472
472
200
400
802
CISET
High-power USB charging from the DC
input, R = 3kΩ, PEN2 = high,
BAT Fast-Charge Current Limit
mA
CISET
USUS = low
AC-to-DC adapter charging from the DC
input, R = 3kΩ, R = 15kΩ,
DISET
CISET
PEN1 = high
AC-to-DC adapter charging from the DC
input, R = 3kΩ, R = 7.5kΩ,
DISET
CISET
PEN1 = high
AC-to-DC adapter charging from the DC
input, R = 3kΩ, R = 3.74kΩ,
DISET
CISET
PEN1 = high
BAT Prequalification Current
Top-Off Threshold
V
= 2.5V, R
= 3.74kΩ
65
20
82
30
100
40
mA
mA
BAT
CISET
CISET
T
A
= +25°C, R
= 3.74kΩ (Note 6)
No DC or USB power
connected
0
1
+5
+5
EN = low,
= +25°C
BAT Leakage Current
Charger Soft-Start Time
µA
T
A
DC and/or USB power
connected, CEN = high
-5
Slew rate
450
1.10
0.22
0.88
mA/ms
ms
Time from 0mA to 500mA
Time from 0mA to 100mA
Time from 100mA to 500mA
t
SS_CHG
Timer Accuracy
C
= 0.15µF
-20
+20
350
%
CT
CISET voltage when the fast-charge timer
suspends; 300mV translates to 20% of the
maximum fast-charge current limit
Timer Suspend Threshold
250
300
750
mV
CISET voltage when the fast-charge timer
suspends; 750mV translates to 50% of the
maximum fast-charge current limit
Timer Extend Threshold
700
800
mV
_______________________________________________________________________________________
7
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
33
MAX
UNITS
min
min
s
Prequalification Time
Fast-Charge Time
Top-Off Time
t
C
C
= 0.15µF
= 0.15µF
PQ
CT
CT
t
t
660
15
FC
TO
MA8671X
THERMISTOR INPUT (THM) (V
= 5.0V, EN = low)
DC
% of
THM Threshold, Cold
V
V
V
V
rising, 65mV hysteresis
falling, 65mV hysteresis
73.0
74.0
28.4
75.5
30.0
THMC
THMH
THM
THM
V
VL
% of
THM Threshold, Hot
27.0
V
VL
THM = AGND or VL, T = +25°C
-0.100
0.001 +0.200
0.01
A
THM Input Leakage Current
I
µA
THM
THM = AGND or VL, T = +85°C
A
POWER SEQUENCING (Figures 11 and 12)
EN to REG3 Enable Delay
REG1 Soft-Start Time
t
120
2.6
0.4
2.6
2.6
0.3
3.0
3.0
µs
D1
t
ms
ms
ms
ms
ms
ms
ms
SS1
REG3 to REG1/2 Delay
t
D2
REG2 Soft-Start Time
t
t
SS2
SS3
REG3 Soft-Start Time
REG1/2 to REG4 Delay
t
D3
REG4 Soft-Start Time
t
SS4
SS5
REG5 Soft-Start Time
t
REGULATOR THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T rising
J
+165
15
°C
°C
REG1—SYNCHRONOUS STEP-DOWN CONVERTER
Input Voltage
PV1 supplied from SYS
V
V
mA
V
SYS
Maximum Output Current
FB1 Voltage
L = 4.7µH, R = 0.13Ω (Note 7)
425
0.997
1
L
(Note 8)
1.012
1.028
Adjustable Output Voltage Range
V
V
SYS
T
T
= +25°C
= +85°C
-50
-5
-5
+50
A
A
FB1 Leakage Current
V
= 1.012V
nA
FB1
Load Regulation
PWM mode
4.4
1
%/A
%/D
mΩ
mΩ
Line Regulation
PWM mode (Note 9)
p-Channel On-Resistance
n-Channel On-Resistance
V
V
= 4V, I
= 4V, I
= 180mA
165
200
330
400
PV1
PV1
LX1
LX1
= 180mA
p-Channel Current-Limit
Threshold
0.555
0.615
0.675
A
8
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Skip Mode Transition Current
(Note 10)
60
mA
n-Channel Zero-Crossing
Threshold
10
mA
Maximum Duty Cycle
100
12.5
2.0
%
%
Minimum Duty Cycle
PWM mode
Internal Oscillator Frequency
1.8
0.5
2.2
2.0
MHz
Internal Discharge Resistance in
Shutdown
EN = low, resistance from LX1 to PG1
1.0
kΩ
REG2—SYNCHRONOUS STEP-DOWN CONVERTER
Input Voltage
PV2 supplied from SYS
V
V
mA
V
SYS
Maximum Output Current
FB2 Voltage
L = 4.7µH, R = 0.13Ω (Note 7)
425
0.997
1
L
(Note 8)
1.012
1.028
Adjustable Output Voltage Range
V
V
SYS
T
T
= +25°C
= +85°C
-50
-5
-50
4.4
1
+50
A
A
FB2 Leakage Current
V
= 1.012V
nA
FB2
Load Regulation
PWM mode
%/A
%/D
mΩ
mΩ
Line Regulation
PWM mode (Note 9)
p-Channel On-Resistance
n-Channel On-Resistance
V
V
= 4V, I
= 180mA
200
150
400
265
PV2
PV2
LX2
LX2
= 4V, I
= 180mA
p-Channel Current-Limit
Threshold
0.555
0.615
60
0.675
A
Skip Mode Transition Current
(Note 10)
mA
mA
n-Channel Zero-Crossing
Threshold
10
Maximum Duty Cycle
100
12.5
2.0
%
%
Minimum Duty Cycle
PWM mode
Internal Oscillator Frequency
1.8
0.5
2.2
2.0
MHz
Internal Discharge Resistance in
Shutdown
EN = low, resistance from LX2 to PG2
1.0
kΩ
REG3—SYNCHRONOUS STEP-DOWN CONVERTER
Input Voltage
PV3 supplied from SYS
V
V
mA
V
SYS
Maximum Output Current
FB3 Voltage
L = 4.7µH, R = 0.13Ω (Note 7)
425
0.997
1
L
(Note 8)
1.012
1.028
Adjustable Output Voltage Range
V
V
SYS
T
T
= +25°C
= +85°C
-50
-5
+50
A
A
FB3 Leakage Current
Load Regulation
V
= 1.012V
nA
FB2
-50
4.4
PWM mode
%/A
_______________________________________________________________________________________
9
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Line Regulation
PWM mode (Note 9)
(Note 10)
1
%/D
p-Channel Current-Limit
Threshold
0.555
0.615
60
0.675
A
MA8671X
Skip Mode Transition Current
mA
mA
n-Channel Zero-Crossing
Threshold
10
p-Channel On-Resistance
n-Channel On-Resistance
Maximum Duty Cycle
V
V
= 4V, I
= 4V, I
= 180mA
= 180mA
230
120
100
12.5
2.0
460
210
mΩ
mΩ
%
PV3
PV3
LX3
LX3
Minimum Duty Cycle
PWM mode
%
Internal Oscillator Frequency
1.8
0.5
2.2
2.0
MHz
Internal Discharge Resistance in
Shutdown
EN = low, resistance from LX3 to PG3
1.0
kΩ
REG4—LINEAR REGULATOR
PV4 Operating Range
V
1.7
V
V
V
PV4
SYS
PV4 Undervoltage Lockout
Threshold
V
rising, 100mV hysteresis
1.55
1.60
1.65
PV4
FB4 Voltage
No load
= 0.6V
0.582
-50
0.600
-5
0.618
+50
V
T
T
= +25°C
= +85°C
A
A
FB4 Leakage Current
V
nA
FB4
-5
PV4 to OUT4, V
PV4 to OUT4, V
= 3.3V
= 2.0V
0.45
0.75
230
235
PV4
Drop-Out Resistance
Current Limit
Ω
1.8
PV4
V
V
= 0.54V
= 0V
200
265
FB4
FB4
mA
10Hz to 100kHz;
Output Noise
PSRR
120
µV
C
V
= 3.3µF, I
set for 1.8V
= 10mA, V
= 2V,
RMS
OUT4
OUT4
OUT4
PV4
f = 1kHz, I
= 10mA, V
= 2V,
PV4
OUT4
67
50
V
set for 1.8V
OUT4
dB
f = 10kHz, I
= 10mA, V
= 2V,
OUT4
set for 1.8V
PV4
V
OUT4
Internal Discharge Resistance in
Shutdown
EN = low, resistance from OUT4 to AGND
0.5
1.0
2.0
kΩ
10 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REG5—LINEAR REGULATOR
PV5 Operating Range
V
1.7
V
V
V
PV5
SYS
PV5 Undervoltage Lockout
Threshold
V
rising, 100mV hysteresis
1.55
1.60
1.65
PV5
FB5 Voltage
No load
0.582
-50
0.600
-5
0.618
+50
V
T
T
= +25°C
= +85°C
A
A
FB5 Leakage Current
V
= 0.6V
nA
FB5
-5
V
V
V
V
to OUT5, V
to OUT5, V
= 0.54V
= 3.3V
= 2.0V
0.45
0.75
230
235
PV5
PV5
FB5
FB5
PV5
PV5
Drop-Out Resistance
Current Limit
Ω
1.8
200
265
mA
= 0V
10Hz to 100kHz,
Output Noise
PSRR
C
V
= 2.2µF, I
set for 3.3V
= 10mA, V
= 3.5V,
180
µV
RMS
OUT5
OUT5
OUT5
PV5
f = 1kHz, I
= 10mA, V
= 3.5V,
PV5
OUT5
62
44
V
set for 3.3V
OUT5
dB
f = 10kHz, I
= 10mA, V
= 3.5V,
OUT5
set for 3.3V
PV5
V
OUT5
Internal Discharge Resistance in
Shutdown
EN = low, resistance from OUT5 to AGND
0.5
3.0
1.0
2.0
3.6
0.6
kΩ
VL—LINEAR REGULATOR
VL Voltage
V
I
= 0mA to 3mA
VL
3.3
V
VL
LOGIC (UOK, DOK, PEN1, PEN2, USUS, CEN, CST1, CST2, EN, PWM)
V
5.5V
or V
= 4.1V to 6.6V, V
= 2.6V to
= 2.6V to
USB
DC
SYS
SYS
Logic Input-Voltage Low
Logic Input-Voltage High
V
V
V
or V
= 4.1V to 6.6V, V
USB
DC
1.3
5.5V
T
T
= +25°C
= +85°C
0.001
0.01
10
1
A
Logic Input Leakage Current
Logic Output-Voltage Low
V
= 0V to 5.5V
= 5.5V
µA
mV
µA
LOGIC
A
I
= 1mA
30
1
SINK
T
T
= +25°C
= +85°C
0.001
0.01
A
Logic Output-High Leakage
Current
V
LOGIC
A
TRI-STATE INPUT (BVSET)
BVSET Input-Voltage Low
V
V
or V
= 4.1V to 6.6V
= 4.1V to 6.6V
0.3
V
V
USB
USB
DC
DC
V
-
VL
BVSET Input-Voltage Mid
or V
1.2
1.2
______________________________________________________________________________________ 11
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, LX_ unconnected; V
= V /2, V
= V
= 0V, V
= 4V, CEN = low, USUS = low, EN = high,
BAT
THM
L
PG_
AGND
V
R
= V
= 3.3V, V
VL
= 0V, C
CT
= 1µF, C
BP
= 1µF, C
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
= 3kΩ,
PEN1
CISET
PEN2
PWM
OUT4
OUT5
SYS
DISET
= 3kΩ, C = 0.1µF, C = 0.15µF, C = 0.01µF, V
= 1.1V, V
= 1.1V, V
= 1.1V, T = -40°C to +85°C, unless other-
FB3 A
FB1
FB2
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
= 4.1V to 6.6V
MIN
TYP
MAX
UNITS
V
V
-
V
+
VL
VL
BVSET Input-Voltage High
V
or V
USB DC
0.3
0.3
Internal BVSET Pullup Resistance
52.5
50
kΩ
MA8671X
External BVSET Pulldown
Resistance for Midrange Voltage
R
45
55
kΩ
BVSET
Note 2: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed through cor-
A
relation using statistical quality control (SQC) methods.
Note 3: The USB/DC current limit does not include the VL output current. See the VL Linear Regulator section for more information.
Note 4: Quiescent current excludes the energy needed for the REG1–REG5 external resistor-dividers. All typical operating charac-
teristics include the energy for the REG1–REG5 external resistor-dividers. For the circuit of Figure 1, the typical quiescent
current with DC and USB unconnected, EN = high, V
= 4V, and PWM = low is 175µA.
BAT
Note 5: The charger transitions from done to fast-charge mode at this BAT recharge threshold (Figure 7).
Note 6: The charger transitions from fast-charge to top-off mode at this top-off threshold (Figure 7).
Note 7: The maximum output current is guaranteed by correlation to the p-channel current-limit threshold, p-channel on-resistance,
n-channel on-resistance, oscillator frequency, input voltage range, and output voltage range. The parameter is stated for a
4.7µH inductor with 0.13Ω series resistance. See the Step-Down Converter Output Current section for more information.
Note 8: The step-down output voltages are 1% high with no load due to the load-line architecture. When calculating the external
resistor-dividers, use an FB_ voltage of 1.000V.
Note 9: Line regulation for the step-down converters is measured as ΔV
/ΔD, where D is the duty cycle (approximately
OUT
V
/V ).
OUT IN
Note 10:The skip mode current threshold is the transition point between fixed-frequency PWM operation and skip mode operation.
The specification is given in terms of output load current for inductor values shown in the typical application circuits.
12 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Typical Operating Characteristics
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
QUIESCENT CURRENT
vs. DC OR USB SUPPLY VOLTAGE
QUIESCENT CURRENT
vs. DC OR USB SUPPLY VOLTAGE
USB QUIESCENT CURRENT
vs. USB SUPPLY VOLTAGE, USB SUSPEND
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
CHARGER ENABLED
NO BATTERY INPUT
VOLTAGE AT DC OR
USB WITH THE
OTHER INPUT LEFT
UNCONNECTED
CHARGER ENABLED
NO BATTERY INPUT
VOLTAGE AT DC OR
USB WITH THE
OTHER INPUT LEFT
UNCONNECTED
FALLING
FALLING
RISING
RISING
USB VOLTAGE RISING
0
2
4
6
8
10 12 14 16
0
2
4
6
8
10 12 14 16
0
2
4
6
8
10 12 14 16
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
USB VOLTAGE (V)
BATTERY LEAKAGE CURRENT
vs. BATTERY VOLTAGE WHEN
REGULATORS ARE POWERED FROM USB
BATTERY LEAKAGE CURRENT
vs. BATTERY VOLTAGE
0.8
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
NO EXTERNAL POWER
0.7 EN = LOW
CEN = HIGH
0.6
0.5
0.4
0.3
0.2
0.1
0
V
V
= 5V
= 0V
USB
DC
PEN1 = PEN2 = 1
EN = 1
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
______________________________________________________________________________________ 13
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
CHARGE CURRENT vs. BATTERY
VOLTAGE WITH USB INPUT
CHARGE CURRENT
vs. BATTERY VOLTAGE
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
V
V
= 5.0V
V
V
= 5.0V
USB
USB
= 0V
PEN1 = 1
PEN2 = 1
= 0V
DC
DC
PEN1 = 1, PEN2 = 1
R
CISET
= 10kΩ
MA8671X
R
CISET
= 6.04kΩ
PEN2 = 0
3.5
0
0
2.0
2.5
3.0
4.0
4.5
2.0
2.5
3.0
3.5
4.0
4.5
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
CHARGE CURRENT vs. AMBIENT
TEMPERATURE, LOW POWER DISSIPATION
CHARGE CURRENT vs. AMBIENT
TEMPERATURE, HIGH IC POWER DISSIPATION
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
500
450
400
350
300
250
200
150
100
50
500
4.50
4.45
4.40
4.35
4.30
4.25
4.20
4.15
4.10
4.05
4.00
V
V
= 5V
= 0V
USB
DC
450
400
350
300
250
200
150
100
50
PEN2 = 1
PEN2 = 1
PEN1 = 1
PEN2 = 0
BVSET = VL
NO LOAD
V
V
V
= 6.5V
= 0V
= 3.1V
USB
DC
BAT
V
V
V
= 5.0V
= 0V
= 4.0V
USB
DC
BAT
PEN1 = 1
PEN1 = 1
PEN2 = 0
10
PEN2 = 0
10
0
0
-40
-15
35
60
85
-40
-15
35
60
85
-40
-15
10
35
60
85
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
V
SYS
vs. SYS CURRENT
V
SYS
vs. SYS CURRENT
V
SYS
vs. SYS CURRENT
4.10
4.05
4.00
3.95
3.90
3.85
3.80
5.50
5.00
4.50
4.00
3.50
3.00
5.50
5.00
4.50
4.00
3.50
3.00
DC OPEN, USB OPEN, V = 4.0V
BAT
THE SLOPE SHOWS THE SYSTEM LOAD
SWITCH HAS AN ON-RESISTANCE OF 81mΩ.
DC OPEN, V
PEN1 = 1, PEN2 = 0, CHARGER DISABLED
= 5.1V, V = 4.0V
BAT
DC OPEN, V
PEN1 = 1, PEN2 = 0, CHARGER DISABLED
= 5.1V, V = 4.0V
USB
USB
BAT
0
200
400
600
800
1000
0
200
400
600
800
1000
0
200
400
600
800
1000
SYS CURRENT (mA)
SYS CURRENT (mA)
SYS CURRENT (mA)
14 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
USB CONNECT (50mA SYS LOAD)
USB DISCONNECT (50mA SYS LOAD)
USB CONNECT (NO SYS LOAD)
MAX8671X toc15
MAX8671X toc16
MAX8671X toc14
5V/div
500mA/div
V
5V/div
V
USB
5V/div
500mA/div
V
USB
USB
I
USB
I
USB
I
USB
500mA/div
2V/div
4.14V
4.14V
4.0V
4.14V
4.0V
2V/div
5V/div
4.0V
0mA
V
V
2V/div
5V/div
SYS
V
SYS
SYS
5V/div
V
UOK
V
UOK
V
UOK
+50mA
I
I
BAT
BAT
I
500mA/div
-425mA CHARGING
2ms/div
BAT
500mA/div
+50mA
-425mA CHARGING
2ms/div
-475mA CHARGING
2ms/div
500mA/div
50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT
50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT
0mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT
USB RESUME
USB SUSPEND
MAX8671X toc18
MAX8671X toc17
V
V
I
USUS
USB
5V/div
5V/div
500mA/div
500mA/div
2V/div
I
USB
USB
4.14V
4.14V
4.0V
4.0V
2V/div
V
SYS
V
SYS
CST1
CST2
5V/div
5V/div
V
V
V
V
5V/div
5V/div
CST1
CST2
+50mA
+50mA
I
BAT
500mA/div
-425mA
I
BAT
-425mA
500mA/div
400μs/div
50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT
400μs/div
50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT
______________________________________________________________________________________ 15
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
AC-TO-DC ADAPTER CONNECT
WITH NO USB
AC-TO-DC ADAPTER DISCONNECT
WITH USB
AC-TO-DC ADAPTER CONNECT WITH USB
MAX8671X toc20
MAX8671X toc21
MAX8671X toc19
4.14V
4V
4.14V
1A
V
V
SYS
SYS
V
4.14V
4.0V
4V
SYS
2V/div
2V/div
5V/div
500mA/div
1A
1A
500mA/div
500mA/div
I
I
DC
DC
I
DC
MA8671X
I
500mA/div
500mA/div
USB
I
USB
500mA/div
500mA/div
I
BAT
+160mA
I
BAT
500mA/div
-840mA
-330mA
-330mA
+160mA
I
BAT
-840mA
-840mA
400μs/div
20ms/div
400μs/div
25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC
25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC LIMIT
25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC
LIMIT
LIMIT, R
= 3.01kΩ
DISET
POWER-UP SEQUENCING
MAX8671X toc22
5V/div
V
EN
5V/div
5V/div
V
OUT1
V
V
OUT2
2V/div
OUT3
5V/div
5V/div
5V/div
V
V
OUT4
OUT5
V
VL
I
USB
50mA/div
4ms/div
16 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
REG1 DROPOUT VOLTAGE
vs. LOAD CURRENT
REG1 EFFICIENCY vs. LOAD CURRENT
REG1 LOAD REGULATION
2.900
2.880
2.860
2.840
2.820
2.800
2.780
2.760
2.740
2.720
2.700
200
180
160
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
THE NOMINAL INDUCTOR DC RESISTANCE
IS 140mΩ. THE NOMINAL p-CHANNEL
RESISTANCE OF THE REGULATOR IS
200mΩ AT 2.8V AND 185mΩ AT 3.3V.
THE SLOPE OF THE LINE SHOWS
THAT THE TOTAL DROPOUT
R
FBH
R
FBL
= 182kΩ
= 100kΩ
PWM = 0
V
OUT1
= 2.8V
RESISTANCE OF AN AVERAGE
PART, BOARD, INDUCTOR
COMBINATION IS
330mΩ AT 3.3V
AND 354mΩ
AT 2.8V.
V
= 3.3V
OUT1
60
V
= 2.8V
OUT1
PWM = 1
= 2.8V
V
OUT1
40
SYS IS 100mV BELOW THE
REG1 NOMINAL REGULATION
VOLTAGE.
20
V
= 4V
BATT
0
1
10
100
1000
0
50
100
150
200
250
0
100
200
300
400
500
LOAD CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
REG1 LIGHT-LOAD SWITCHING
WAVEFORMS (PWM = 1)
REG1 HEAVY-LOAD SWITCHING
WAVEFORMS
REG1 LIGHT-LOAD SWITCHING
WAVEFORMS (PWM = 0)
MAX8671X toc27
MAX8671X toc28
MAX8671X toc26
20mV/div
(AC-COUPLED)
V
V
OUT1
V
OUT1
OUT1
10mV/div
10mV/div
(AC-COUPLED)
V
2V/div
V
2V/div
V
LX1
2V/div
LX1
LX1
0
0
0
100mA/div
100mA/div
200mA/div
I
I
LI
I
LI
LI
0
0
0
20mA LOAD
20mA LOAD
20mA LOAD
200ns/div
400ns/div
4μs/div
REG1 LINE TRANSIENT
REG1 LOAD TRANSIENT
MAX8671X toc30
MAX8671X toc29
5.3V
2V/div
50mV/div
(AC-COUPLED)
3.3V
3.3V
V
OUT1
V
SYS
250mA
25mA
V
I
25mA
20mV/div
OUT1
OUT1
100mA/div
25mA LOAD
100μs/div
20μs/div
______________________________________________________________________________________ 17
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
REG2 LOAD REGULATION
REG2 EFFICIENCY vs. LOAD CURRENT
100
1.60
1.55
1.50
1.45
1.40
90
80
70
60
50
40
30
20
10
0
PWM = 0
V
OUT2
= 1.5V
PWM = 1
= 1.5V
MA8671X
V
OUT2
V
BATT
= 4.0V
0
50
100
150
200
250
1
10
100
1000
OUTPUT CURRENT (mA)
LOAD CURRENT (mA)
REG3 EFFICIENCY vs. LOAD CURRENT
REG3 LOAD REGULATION
100
90
80
70
60
50
40
30
20
10
0
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
R
FBH
R
FBL
= 20kΩ
= 100kΩ
PWM = 0
V
OUT2
= 1.2V
PWM = 1
V
OUT2
= 1.2V
V
= 4.0V
BATT
1
10
100
1000
0
50
100
150
200
250
LOAD CURRENT (mA)
OUTPUT CURRENT (mA)
OUT3 LIGHT-LOAD SWITCHING
WAVEFORMS (PWM = 0)
OUT3 HEAVY-LOAD SWITCHING
WAVEFORMS
OUT3 LOAD TRANSIENT
MAX8671X toc37
MAX8671X toc35
MAX8671X toc36
PWM = 0
20mV/div
10mV/div
V
OUT1
V
OUT1
V
OUT1
100mV/div
2V/div
0
2V/div
0
V
LX1
V
LX1
250mA
10mA LOAD
25mA
25mA
I
OUT1
100mA/div
I
L1
I
L1
200mA/div
200mA/div
250mA LOAD
10μs/div
400ns/div
40μs/div
18 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Typical Operating Characteristics (continued)
(Circuit of Figure 1, I = 0mA, T = +25°C, unless otherwise noted.)
VL
A
REG4 LOAD REGULATION
REG4 LOAD TRANSIENT
REG4 LINE TRANSIENT
MAX8671X toc40
MAX8671X toc39
2.554
R
R
= 316kΩ
FBH
FBL
2.552
2.550
2.548
2.546
2.544
2.542
2.540
2.538
2.536
2.534
5.3V
= 100kΩ
2V/div
V
50mV/div
PV4
3.3V
3.3V
V
OUT4
150mA
100mV/div
50mA
50mA
10mV/div
V
OUT4
I
OUT4
V
V
= V = 4V
SYS
PV4
PV = SYS
13.4Ω LOAD
= 2.5V
V
= 4V
OUT4
SYS
100
50
OUTPUT CURRENT (mA)
0
150
40μs/div
100μs/div
REG5 LOAD REGULATION
REG5 LOAD TRANSIENT
MAX8671X toc42
3.260
3.258
3.256
3.254
3.252
3.250
3.248
3.246
3.244
3.242
50mV/div
V
OUT5
150mA
100mV/div
50mA
50mA
I
OUT5
V
V
= 5V,
= 3.3V
USB
OUT5
V
= 5V
USB
3.240
0
100
OUTPUT CURRENT (mA)
50
150
40μs/div
______________________________________________________________________________________ 19
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Pin Description
PIN
NAME
FUNCTION
USB Suspend Digital Input. As shown in Table 1, driving USUS high suspends the DC or USB inputs
if they are configured as a USB power input.
1
USUS
DC Power Input. DC is capable of delivering 1A to SYS. DC supports both AC adaptors and USB
2
3
4
5
DC
USB
FB5
PV5
inputs. As shown in Table 1, the DC current limit is controlled by PEN1, PEN2, USUS, and R
.
DISET
USB Power Input. USB is capable of delivering 0.5A to SYS. As shown in Table 1, the USB current
limit is controlled by PEN1, PEN2, and USUS.
MA8671X
Feedback Input for REG5. Connect FB5 to the center of a resistor voltage-divider from OUT5 to
AGND to set the REG5 output voltage from 0.6V to V
.
PV5
Power Input for REG5. Connect PV5 to SYS, or a supply between 1.7V and V . Bypass PV5 to
SYS
power ground with a 1µF ceramic capacitor.
6
7
8
OUT5
PG2
LX2
Linear Regulator Power Output. OUT5 is internally pulled to AGND by 1kΩ in shutdown.
Power Ground for the REG2 Step-Down Regulator
Inductor Switching Node for REG2. LX2 is internally pulled to PG2 by 1kΩ in shutdown.
Power Input for the REG2 Step-Down Regulator. Connect PV2 to SYS. Bypass PV2 to PG2 with a
4.7µF ceramic capacitor.
9
PV2
CEN
FB2
DOK
FB4
Active-Low Charger Enable Input. Pull CEN low to enable the charger, or drive CEN high to disable
charging. The battery charger is also disabled when USUS is high.
10
11
12
13
Feedback Input for REG2. Connect FB2 to the center of a resistor voltage-divider from the REG2
output capacitors to AGND to set the output voltage from 1V to V
.
SYS
Active-Low, Open-Drain DC Power-OK Output. DOK is low when V is within its valid operating
DC
range.
Feedback Input for REG4. Connect FB4 to the center of a resistor voltage-divider from the REG4
output capacitors to AGND to set the output voltage from 0.6V to V
.
PV4
Reference Noise Bypass. Bypass BP with a low-leakage 0.01µF ceramic capacitor for reduced noise
on the LDO outputs.
14
15
16
BP
OUT4
PV4
Linear Regulator Power Output. OUT4 is internally pulled to AGND in shutdown.
Power Input for REG4. Connect PV4 to SYS, or a supply between 1.7V and V . Bypass PV4 to
SYS
power ground with a 1µF ceramic capacitor.
Battery Regulation Voltage Set Node. Drive BVSET low to set the regulation voltage to 4.1V. Connect
BVSET to VL or leave unconnected to set the regulation voltage to 4.2V. Connect BVSET to AGND
through a 50kΩ resistor to set the regulation voltage to 4.350V.
17
BVSET
18
19
AGND
FB1
Ground. AGND is the low-noise ground connection for the internal circuitry.
Feedback Input for REG1. Connect FB1 to the center of a resistor voltage-divider from the REG1
output capacitors to AGND to set the output voltage from 1V to V
.
SYS
Regulator Enable Input. Drive EN high to enable all regulator outputs. The sequencing is shown in
Figure 11. Drive EN low to disable the regulators.
20
21
22
EN
PWM
PV1
Forced-PWM Input. Connect PWM high for forced-PWM operation on REG1, REG2, and REG3.
Connect PWM low for auto PWM operation. Do not change PWM on-the-fly. See the PWM section
for more information.
Power Input for the REG1 Step-Down Regulator. Connect PV1 to SYS. Bypass PV1 to PG1 with a
4.7µF ceramic capacitor.
20 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Pin Description (continued)
PIN
23
NAME
LX1
FUNCTION
Inductor Switching Node for REG1. LX1 is internally pulled to PG1 by 1kΩ in shutdown.
Power Ground for the REG1 Step-Down Regulator
24
PG1
PG3
LX3
25
Power Ground for the REG3 Step-Down Regulator
26
Inductor Switching Node for REG3. LX3 is internally pulled to PG3 by 1kΩ in shutdown.
Power Input for the REG3 Step-Down Regulator. Connect PV3 to SYS. Bypass PV3 to PG3 with a
4.7µF ceramic capacitor.
27
PV3
IC Supply Output. VL is an LDO output that powers the MAX8671X internal battery-charger circuitry.
VL provides 3.3V at 3mA to power external circuitry when DC or USB is present. Connect a 0.1µF
capacitor from VL to AGND.
28
VL
Feedback Input for REG3. Connect FB3 to the center of a resistor voltage-divider from the REG3
29
30
31
FB3
output capacitors to AGND to set the output voltage from 1V to V
.
SYS
DC Input Current-Limit Select Input. Connect a resistor from DISET to AGND (R
current limit. See Table 2 for more information.
) to set the DC
DISET
DISET
CISET
Charge Rate Select Input. Connect a resistor from CISET to AGND (R
) to set the fast-charge
CISET
current limit, prequalification-charge current limit, and top-off threshold.
Charge Timer Programming Node. Connect a capacitor from CT to AGND (C ) to set the time
CT
required for a fault to occur in fast-charge or prequalification modes. Connect CT to AGND to disable
the fast-charge and prequalification timers.
32
CT
Thermistor Input. Connect a negative temperature coefficient (NTC) thermistor that has a good
thermal contact with the battery from THM to AGND. Connect a resistor equal to the thermistor
resistance at +25°C from THM to VL. Charging is suspended when the battery is outside the hot or
cold limits.
33
34
THM
BAT
Positive Battery Terminal Connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly
battery.
System Supply Output. Bypass SYS to power ground with a 10µF ceramic capacitor.
When a valid voltage is present at USB or DC and not suspended (USUS = low), SYS is limited to
5.3V (V
). When the system load (I
allowing both the external power source and the battery service SYS.
) exceeds the input current limit, SYS drops below V
SYS-REG
SYS BAT
35
SYS
by V
BSREG
SYS is connected to BAT through an internal system load switch (R ) when a valid source is not
BS
present at USB or DC.
36
37
PEN1
CST2
Input Current-Limit Control 1. See Table 1 for more information.
Open-Drain Charger Status Output 2. CST1 and CST2 indicate four different charger states. See
Table 3 for more information.
Active-Low, Open-Drain USB Power-OK Output. UOK is low when V
range.
is within its valid operating
USB
38
UOK
Open-Drain Charger Status Output 1. CST1 and CST2 indicate four different charger states. See
Table 3 for more information.
39
40
—
CST1
PEN2
EP
Input Current-Limit Control 2. See Table 1 for more information.
Exposed Paddle. Connect the exposed paddle to AGND. Connecting the exposed paddle does not
remove the requirement for proper ground connections to AGND, PG1, PG2, and PG3.
______________________________________________________________________________________ 21
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
2
35
SYS
BAT
DC
AC-TO-DC ADAPTER
SYS
10μF
4.7μF
3
34
USB
VBUS
BAT
VL
4.7μF
0.1μF
4.7μF
3.3V
3mA
VL
10kΩ
28
VL
33
THM
MA8671X
18
15
16
10kΩ
β = 3380K
T
AGND
+
Li+/Li-Poly
1.8V
MAX8671X
180mA
OUT4
PV4
OUT4
4.7μH
0.6A
2.8V
425mA
OUT1
121kΩ
60.4kΩ
23
OUT2
1.0μF
2.2μF
LX1
182kΩ
100kΩ
13
19
22
2x
10μF
FB4
FB1
PV1
SYS
3.3V
180mA
OUT5
6
5
4.7μF
OUT5
PV5
24
8
SYS
1.0μF
2.0V
425mA
OUT2
PG1
LX2
274kΩ
60.4kΩ
2.2μF
4.7μH
0.6A
100kΩ
100kΩ
4
FB5
11
9
2x
10μF
FB2
PV2
SYS
ON
20
21
EN
OFF
4.7μF
7
1.2V
425mA
OUT3
PG2
LX3
PWM
26
4.7μH
0.6A
36
20kΩ
PEN1
PEN2
USUS
CEN
40
1
29
27
FB3
PV3
2x
10μF
SYS
10
100kΩ
4.7μF
IO
4x
560kΩ
5%
μP
25
17
14
PG3
BVSET
39
37
12
38
CST1
CST2
DOK
BP
0.01μF
3kΩ
30
31
DISET
UOK
CISET
CT
3kΩ
32
0.15μF
EP
Figure 1. MAX8671X Typical Application Circuit
22 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
SYS
DC
DOK
DISET
PEN1
Li+/Li-Poly BATTERY
SMART
POWER
CHARGER AND
SYSTEM LOAD
SWITCH
PEN2
USUS
SELECTOR
BAT
BVSET
UOK
USB
CST2
CST1
THM
CEN
HIGHEST
VOLTAGE
SELECTOR
CT
CISET
IN
SMART POWER
SELECTOR AND
CHARGER BIAS
VL
OUT
3.3V
LDO
MAX8671X
AGND
PV4
PV1
LX1
REG4
LDO
OUT4
FB4
REG1
DC-DC
PG1
FB1
BP
PV2
LX2
REF
REG2
DC-DC
PG2
FB2
PV5
OUT5
FB5
EN
REG5
LDO
PV3
LX3
REG3
DC-DC
PG3
FB3
PWM
Figure 2. Functional Diagram
______________________________________________________________________________________ 23
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
When the system load requirements exceed the
Detailed Description
input current limit, the battery supplies supple-
The MAX8671X highly integrated PMIC is ideally suited
mental current to the load through the internal sys-
for use in portable audio player and handheld applica-
tem load switch.
tions. As shown in Figure 2, the MAX8671X integrates
• When the battery is connected and there is no exter-
nal power input, the system (SYS) is powered from
the battery.
USB power input, AC-to-DC adapter power input (DC),
Li+/Li-Poly battery charger, three step-down regulators,
two linear regulators, and various monitoring and status
outputs. The MAX8671X offers adjustable output volt-
ages for all outputs.
• When an external power input is connected and
there is no battery, the system (SYS) is powered
from the external power input.
MA8671X
Smart Power Selector
The MAX8671X Smart Power Selector seamlessly dis-
tributes power between the two current-limited external
inputs (USB and DC), the battery (BAT), and the sys-
tem load (SYS). The basic functions performed are:
The dual-input Smart Power Selector supports end
products with dual and single external power inputs.
For end products with dual external power inputs, con-
nect these inputs directly to the DC and USB nodes of
the MAX8671X. For end products with a single input,
connect the single input to the DC node and connect
USB to ground or leave it unconnected. In addition to
AC-to-DC adapters current limits, the DC input also
supports USB current limit to allow for end products
• With both an external power supply (USB or DC)
and battery (BAT) connected:
When the system load requirements are less than
the input current limit, the battery is charged with
residual power from the input.
Table 1. Input Limiter Control Logic
DC INPUT
CURRENT
LIMIT
USB INPUT
CURRENT
LIMIT
MAXIMUM
CHARGE
CURRENT*
POWER SOURCE
DOK
UOK
PEN1
PEN2
USUS
Lower of I
CHGMAX
AC-to-DC Adapter at
DC Input
and
L
L
X
X
H
L
X
L
X
L
I
DCLIM
I
DCLIM
Lower of I
CHGMAX
USB input off,
DC input has
priority
100mA
and
100mA
USB Power at DC Input
Lower of I
CHGMAX
and
500mA
L
L
X
X
L
L
L
X
H
X
L
L
H
L
500mA
Suspend
0
Lower of I
CHGMAX
and
100mA
H
100mA
500mA
USB Power at USB
Input, DC Unconnected
Lower of I
CHGMAX
No DC input
H
L
X
H
L
and
500mA
H
H
L
X
X
X
X
H
X
Suspend
0
0
DC and USB
Unconnected
H
No USB input
*Charge current cannot exceed the input current limit. Charge can be less than the maximum charge current if the total SYS load
exceeds the input current limit.
X = Don’t care.
24 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
with a single power input to operate from either an AC-
to-DC adapter or USB host (see Table 1).
USB voltage is below the battery voltage, it is consid-
ered invalid. The USB power input is disconnected
when the USB voltage is invalid. As shown in Table 1,
when power is available at the DC input, it has priority
over the USB input. Bypass USB to ground with at least
a 4.7µF capacitor.
A thermal-limiting circuit reduces the battery charger
rate and external power-source current to prevent the
MAX8671X from overheating.
System Load Switch
An internal 80mΩ (R ) MOSFET connects SYS to BAT
when no voltage source is available at DC or USB.
When an external source is detected at DC or USB, this
switch is opened and SYS is powered from the valid
input source through the Smart Power Selector.
To support USB power sources at the USB input drive
PEN2 and USUS to select between three internally set
USB-related current limits as shown in Table 1. Choose
100mA for low-power USB mode. Choose 500mA for
high-power USB mode. Choose suspend to reduce the
USB current to 0.11mA (typ) for both USB suspend
mode and unconfigured OTG mode. To comply with
the USB 2.0 specification, each device must be initially
configured for low power. After USB enumeration, the
device can switch from low power to high power if
given permission from the USB host. The MAX8671X
does not perform enumeration. It is expected that the
system communicates with the USB host and com-
mands the MAX8671X through its PEN1, PEN2, and
USUS inputs. When the load exceeds the input current
limit, SYS drops to 82mV below BAT and the battery
supplies supplemental load current.
BS
When the system load requirements exceed the input
current limit, the battery supplies supplemental current
to the load through the internal system load switch. If
the system load continuously exceeds the input current
limit, the battery does not charge, even though external
power is connected. This is not expected to occur in
most cases because high loads usually occur only in
short peaks. During these peaks, battery energy is
used, but at all other times the battery charges.
USB Power Input (USB)
USB is a current-limited power input that supplies the
system (SYS) up to 500mA. The USB to SYS switch is a
linear regulator designed to operate in dropout. This lin-
ear regulator prevents the SYS voltage from exceeding
The MAX8671X reduces the USB current limit by 5%/°C
when the die temperature exceeds +100°C. The sys-
tem load (I
) has priority over the charger current, so
SYS
input current is first reduced by lowering charge cur-
rent. If the junction temperature still reaches +120°C in
spite of charge current reduction, no input current is
drawn from USB; the battery supplies the entire load
5.3V. USB is typically connected to the V
line of the
BUS
universal serial bus (USB) interface. As shown in Table
1, USB supports three different current limits that are
set with the PEN2 and USUS digital inputs. These cur-
rent limits are ideally suited for use with USB power.
and SYS is regulated below BAT by V . Note that
BSREG
this on-chip thermal-limiting circuit is not related to and
operates independently from the thermistor input.
The operating voltage range for USB is 4.1V to 6.6V,
but it can tolerate up to 14V without damage. When the
USB input voltage is below the undervoltage threshold
, 4V typ) it is considered invalid. Similarly, if the
USB voltage is above the overvoltage threshold
(V , 6.9V typ) it is considered invalid. When the
If the USB power input is not required, connect USB to
ground or leave it unconnected. When both DC and
USB inputs are powered, the DC input has priority.
(V
USBL
USBH
______________________________________________________________________________________ 25
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
must provide the 3.3V termination to the USB trans-
ceivers’ pullup resistors. This 3.3V termination can
come from the MAX8671X’s VL output or REG5. Both
remain enabled in USB suspend.
USB Power-OK Output (UOK)
As shown Figure 3, the USB power-OK output (UOK) is
an active-low open-drain output. The UOK output pulls
low when the voltage from USB to AGND (V
) is
USB
(typically
between V
4.0V).
(typically 6.9V) and V
USBH
USBL
DC Power Input (DC)
DC is a current-limited power input that supplies the
system (SYS) up to 1A. The DC-to-SYS switch is a lin-
ear regulator designed to operate in dropout. This lin-
ear regulator prevents the SYS voltage from exceeding
5.3V. As shown in Table 1, DC supports four different
current limits that are set with the PEN1, PEN2, and
USUS digital inputs. These current limits are ideally
suited for use with AC-to-DC wall adapters and USB
power. The operating voltage range for DC is 4.1V to
6.6V, but it can tolerate up to 14V without damage.
When the DC input voltage is below the undervoltage
The USB power-OK circuitry remains active in thermal
overload and USB suspend. If the USB power-OK out-
put feature is not required, connect UOK to ground or
leave unconnected.
MA8671X
USB Suspend (USUS)
As shown in Table 1, driving USUS high suspends the
DC or USB inputs if they are configured as a USB
power input. The suspend current is 110µA when USUS
is driven high allowing the MAX8671X to comply with
the USB 1.1/2.0 specification for USB suspend as well
as the USB OTG specification for an unconfigured
device. If an external input (USB or DC) is connected to
the MAX8671X and suspended, the SYS node is sup-
ported by the battery. The DOK, UOK, and VL circuits
remain active in USB suspend mode.
threshold (V
, 4V typ), it is considered invalid.
DCL
Similarly, if the DC voltage is above the overvoltage
threshold (V , 6.9V typ), it is considered invalid.
DCH
When the DC voltage is below the battery voltage, it is
considered invalid. The DC power input is disconnect-
ed when the DC voltage is invalid. As shown in Table 1,
when power is available at the DC input, it has priority
over the USB input. Bypass DC to ground with at least
a 4.7µF capacitor.
A common assumption is that REG5 is disabled in USB
suspend. This is not true. REG5 is not affected by the
USB suspend mode. While in suspend, a USB device
USB
MAX8671X
V
USBL
USB
UNDERVOLTAGE
4.0V RISING (typ)
500mV HYST
UOK
USB
OVERVOLTAGE
V
USBH
AGND
6.9V RISING (typ)
400mV HYST
Figure 3. USB Power-OK Logic
26 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
To support common 500mA to 1000mA wall adapters
Table 2. DC Current Limit for Standard
at the DC input, pull PEN1 high. With PEN1 pulled high,
Values of R
DISET
the DC current limit is set by an external resistor from
DISET to AGND (R
current capability of the AC-to-DC adapter (I
follows:
). Choose R
based on the
DISET
DISET
R
(kΩ)
I
(mA)
R
(kΩ)
I
(mA)
DISET
DCLIM
DISET
DCLIM
) as
ADPTR
3.01
997
4.32
694
3.09
3.16
3.24
3.32
3.40
3.48
3.57
3.65
3.74
3.83
3.92
4.02
4.12
4.22
971
949
926
904
882
862
840
822
802
783
765
746
728
711
4.42
4.53
4.64
4.75
4.87
4.99
5.11
5.23
5.36
5.49
5.62
5.76
5.90
6.04
679
662
647
632
616
601
587
574
560
546
534
521
508
497
1.5V
R
≥ 2000×
DISET
I
ADPTR
For the selected value of R
, calculate the DC cur-
DISET
rent limit (I
) as follows (Table 2, Figure 4):
DCLIM
1.5V
I
= 2000×
DCLIM
R
DISET
To support USB power sources at the DC input, pull
PEN1 low. With PEN1 low, drive PEN2 and USUS to
select between three internally set USB-related current
limits as shown in Table 1. Choose 100mA for low-
power USB mode. Choose 500mA for high-power USB
mode. Choose suspend to reduce the DC current to
0.11mA (typ) for both USB suspend mode and uncon-
figured OTG mode. To comply with the USB 2.0 specifi-
cation, each device must be initially configured for low
power. After USB enumeration, the device can switch
from low power to high power if given permission from
the USB host. When the load exceeds the current limit,
DC INPUT CURRENT LIMIT vs.
DC INPUT CURRENT-LIMIT RESISTOR
1000
900
PEN1 = HIGH
SYS drops below BAT by V
plies supplemental load current.
and the battery sup-
BSREG
If the DC power input is not required, connect DC to
ground or leave it unconnected.
800
The MAX8671X reduces the USB and DC current limits
by 5%/°C when the die temperature exceeds +100°C.
700
600
500
The system load (I
) has priority over the charger cur-
SYS
rent, so input current is first reduced by lowering charge
current. If the junction temperature still reaches +120°C
in spite of charge-current reduction, no input current is
drawn from USB and DC; the battery supplies the entire
3.0
3.5
4.0
4.5
(kΩ)
5.0
5.5
6.0
R
load and SYS is regulated below BAT by V . Note
BSREG
DISET
that this on-chip thermal-limiting circuit is not related to
and operates independently from the thermistor input.
Figure 4. Programming DC Current Limit
DC Power-OK Output (DOK)
As shown in Figure 5, the DC power-OK output (DOK)
is an open-drain, active-low output. The DOK output
The DC power-OK circuitry remains active in thermal
overload and DC suspend. If the DC power-OK output
feature is not required, connect DOK to ground or leave
disconnected.
pulls low when the voltage from DC to AGND (V ) is
DC
between V
4.0V).
(typically 6.9V) and V
(typically
DCH
DCL
______________________________________________________________________________________ 27
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
DC
MAX8671X
V
DCL
USB
UNDERVOLTAGE
4.0V RISING (TYP)
500mV HYST
DOK
USB
OVERVOLTAGE
MA8671X
V
DCH
AGND
6.9V RISING (TYP)
400mV HYST
Figure 5. DC Power-OK Logic
The MAX8671X automatically reduces charge current
to prevent input overload. MAX8671X also reduces
charge current when in thermal regulation (see the
Thermal Limiting and Overload Protection section for
more information).
Battery Charger
Figure 6 shows the typical Li+/Li-Poly charge profile for
the MAX8671X, and Figure 7 shows the battery charger
state diagram.
With a valid DC and/or USB input, the battery charger
initiates a charge cycle when the charger is enabled. It
first detects the battery voltage. If the battery voltage is
less than the prequalification threshold (3.0V), the
charger enters prequalification mode in which the bat-
tery charges at 10% of the maximum fast-charge cur-
rent while deeply discharged. Once the battery voltage
rises to 3.0V, the charger transitions to fast-charge
mode and applies the maximum charge current. As
charging continues, the battery voltage rises until it
approaches the battery regulation voltage (selected
with BVSET) where charge current starts tapering
down. When charge current decreases to 4% of the
maximum fast-charge current, the charger enters a
brief 15s top-off state and then charging stops. If the
battery voltage subsequently drops below the battery
Battery Regulation Voltage (BVSET)
BVSET allows the maximum battery charge voltage to
be set to 4.1V, 4.2V, or 4.350V. Drive BVSET low to set
the regulation voltage to 4.1V. Connect BVSET to VL or
leave unconnected to set the regulation voltage to 4.2V.
Connect BVSET to AGND through a 45kΩ to 55kΩ
resistor (R
BVSET
resistor is acceptable.
) to set the regulation voltage to
BVSET
4.350V. R
accuracy is not critical. A 51kΩ 5%
Charge Enable Input (CEN)
CEN is a digital input. Driving CEN high disables the
battery charger. CEN does not affect the USB or DC
current limit. Driving USUS high also disables the bat-
tery charger when charging from a USB source (PEN1
= low).
regulation voltage by V
the timers reset.
, charging restarts and
BATRCHG
In many systems, there is no need for the system
controller (typically a microprocessor (µP)) to disable
the charger because the MAX8671X independently
manages the charger power path. In these situations,
CEN can be connected to ground. Do not leave
CEN unconnected.
The battery charge rate is set by several factors:
• Battery voltage
• USB/DC input current limit
• Charge setting resistor, R
CISET
• System load (I
)
SYS
• Die temperature
28 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
FAST-CHARGE
(CONSTANT CURRENT)
TOP-OFF
PREQUALIFICATION
FAST-CHARGE
(CONSTANT VOLTAGE)
DONE
V
BATREG
V
BATPRQ
I
CHGMAX
I
PQ
I
TO
0
HIGH-Z
LOW
CST[1:2] = 11
CST[1:2] = 00
FOR SIMPLICITY, THIS FIGURE ASSUMES THAT I ~ 0mA
SYS
Figure 6. Li+/Li-Poly Charge Profile
______________________________________________________________________________________ 29
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
NO INPUT POWER
CST [1:2] = 11
1.5V
USB AND DC = INVALID
I
=
x
2000
CHGMAX
R
CISET
UOK = 0, DOK = 0
I
= 0mA
CHG
USB AND/OR DC = INVALID
ANY STATE
CHARGER DISABLED
CST[1:2] = 11
UOK AND/OR DOK = 1
CEN = 1
OR
USUS = 1
MA8671X
I
= 0mA
CHG
THERMISTOR SUSPEND
= 0mA
CST[1:2] = 01
UOK AND/OR DOK = 1
CEN = 0
USUS = 0
IC SETS TIMER = 0
I
CHG
THM OUT OF RANGE
IC SUSPENDS TIMER
t > t
PREQUAL
PREQUALIFICATION
CST[1:2] = 00
UOK AND/OR DOK = 1
THM WITHIN RANGE
IC RESUMES TIMER
TIMER FAULT
CST [1:2] = 10
I
= I
/10
CHG CHGMAX
I
= 0mA
CHG
UOK AND/OR DOK = 1
V
< 2.82V
V
> 3.0V
BAT
BAT
IC SETS TIMER = 0
IC SETS TIMER = 0
THM OUT OF RANGE
IC SUSPENDS TIMER
THERMISTOR SUSPEND
I
= 0mA
CHG
t > t
FST-CHG
CST[1:2] = 01
UOK AND/OR DOK = 1
FAST-CHARGE
CST[1:2] = 00
I
< I
x 53%
CHG CHGMAX
OR V = V
IC RESUMES TIMER
BAT
BATREG
UOK AND/OR DOK = 1
THM WITHIN RANGE
IC RESUMES TIMER
I
< I
x 50%
AND V < V
BAT BATREG
CHG CHGMAX
I
< I
x 4%
CHG CHGMAX
I
> I
x 7%
CHG CHGMAX
IC EXTENDS TIMER BY 2x
AND V = 4.2V
BAT
IC SETS TIMER = 0
IC SETS TIMER = 0
TIMER EXTEND
TOP-OFF
CST[1:2] = 11
CST [1:2] = 00
THM OUT OF RANGE
(I x 20%) < I
< (I
x 50%)
CHGMAX
SET
CHG
UOK AND/OR DOK = 1
V
<
BAT
V
BAT
= V
BATREG
(V
+ V
)
BATREG
BATRCHG
IC SETS TIMER = 0
THERMISTOR SUSPEND
I
= 0mA
I
< I
BAT
x 20%
BATREG
CHG
CHG CHGMAX
AND V < V
t > 15s
I
< I
x 23%
BATREG
CHG CHGMAX
CST[1:2] = 01
UOK AND/OR DOK = 1
THM WITHIN RANGE
AND V = V
BAT
IC SUSPENDS TIMER
IC RESUMES TIMER
DONE
CST[1:2] = 11
UOK AND/OR DOK = 1
t > 15s
(V
+ V
) < V ≤ V
BATRCHG BAT BATREG
BATREG
TIMER SUSPEND
CST [1:2] = 00
I
= 0mA
CHG
I
< (I
x 20%)
CHGMAX
CHG
Figure 7. Charger State Diagram
charge status to the µP. Alternatively, CST1 and CST2
sink up to 20mA each for LED charge indicators.
If the charge status output feature is not required, connect
CST1 and CST2 to ground or leave them unconnected.
Charge Status Outputs (CST1, CST2)
CST1 and CST2 are open-drain charger status outputs.
Their function is shown in Table 3 and Figure 7. When
the MAX8671X is used with a µP, pull CST1 and CST2
up to the system logic voltage with resistors to indicate
30 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Table 3. Charge Status Outputs
Table 4. Charge Times vs. C
CT
t
(min)
t
(min)
FC
CST1
CST2
CHARGING
STATE
FC
C
(nF)
t
(min)
PQ
CT
100% to 50%
50% to 20%
Prequalification or
fast charge
0
0
Yes
68
15.0
299
440
660
968
2068
598
880
100
150
220
470
22.0
33.0
0
1
1
0
No
No
Thermistor suspend
Timer fault
1320
1936
4136
48.4
No input power or
top-off or
103.4
1
1
No
done
Note: CST1 and CST2 are active-low, open-drain outputs. “0”
indicates that the output device is pulling low. “1” indicates
that the output is high impedance.
CHARGE, PREQUALIFICATION,
AND TOP-OFF CURRENT
vs. CHARGE SETTING RESISTOR
Charge Timer (CT)
As shown in Figure 7, a fault timer prevents the battery
from charging indefinitely. In prequalification and fast-
charge modes, the timer is controlled by the capaci-
1000
100
10
I
CHGMAX
tance at CT (C ). The MAX8671X supports values of
CT
C
CT
from 0.01µF to 1µF. Calculate the prequalification
and fast-charge times as follows (Table 4, Figure 8):
I
PQ
I
TO
C
CT
t
t
= 33min ×
PQ
FC
0.15μF
C
0.15μF
CT
= 660min ×
1
0
5
10
15
R
CISET
(kΩ)
When the charger exits fast-charge mode, a fixed 15s
top-off mode is entered:
Figure 8. Programming Charge Current
t
=15s
TO
While in the constant-current fast-charge mode (Figure
6), if the MAX8671X reduces the battery charge current
due to its internal die temperature or large system
loads, it slows down the charge timer. This feature elim-
inates nuisance charge timer faults. When the battery
charge current is between 100% and 50% of its pro-
grammed fast-charge level, the fast-charge timer runs
at full speed. When the battery charge current is
between 50% and 20% of the programmed fast-charge
level, the fast-charge timer is slowed by 2x. Similarly,
when the battery charge current is below 20% of the
programmed fast-charge level, the fast-charge timer is
paused. The fast-charge timer is not slowed or paused
when the charger is in the constant voltage portion of
its fast-charge mode (Figure 6) where charge current
reduces normally.
Connect CT to AGND to disable the prequalification
and fast-charge timers. With the internal timers of the
MAX8671X disabled, an external device, such as a µP,
can control the charge time through the CEN input.
Setting the Charger Currents (CISET)
As shown in Table 5 and Figure 9, a resistor from
CISET to ground (R
) sets the maximum fast-
CISET
charge current (I
), the charge current in pre-
CHGMAX
qualification mode (I ), and the top-off threshold (I ).
PQ
TO
The MAX8671X supports values of I
200mA to 1000mA. Select the R
from
CHGMAX
as follows:
CISET
1.5V
R
= 2000×
CISET
I
CHGMAX
______________________________________________________________________________________ 31
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table 5. Ideal Charge Currents vs.
Charge Setting Resistor
MONITORING THE BATTERY CHARGE
CURRENT WITH V
CISET
R
(kΩ)
I
(mA)
I
(mA)
I
(mA)
40
30
24
20
17
15
13
12
11
10
9
CISET
CHGMAX
1000
746
PQ
TO
R
CISET
V
CISET
=
x I
BAT
2000
3.01
4.02
4.99
6.04
6.98
8.06
9.09
10.0
11.0
12.1
13.0
14.0
15.0
100
75
60
50
43
37
33
30
27
25
23
21
20
1.5
601
497
430
MA8671X
372
330
300
0
273
248
1.5V
DISCHARGING
0
x
2000
231
R
CISET
BATTERY CHARGING CURRENT (A)
214
9
200
8
Figure 9. Monitoring the Battery Charge Current with the
Voltage from CISET to AGND
Determine I
by considering the characteristics
CHGMAX
directly to the CISET pin that exceeds 10pF. If filtering of
the charge current monitor is necessary, include a resis-
tor of 100kΩ or more between CISET and the filter
capacitor to preserve charger stability.
of the battery. It is not necessary to limit the charge cur-
rent based on the capabilities of the expected AC-to-
DC adapter or USB charging input, the system load, or
thermal limitations of the PCB. The MAX8671X automat-
ically lowers the charging current as necessary to
accommodate these factors.
Step-Down Converters
(REG1, REG2, REG3)
REG1, REG2, and REG3 are high-efficiency 2MHz cur-
rent-mode, step-down converters with adjustable out-
puts. Each REG1, REG2, and REG3 step-down
converter delivers at least 425mA.
For the selected value of R
, calculate I
,
CHGMAX
CISET
I , and I as follows:
PQ TO
1.5V
I
= 2000×
CHGMAX
The step-down regulator power inputs (PV_) must be
connected to SYS. The step-down regulators operate
R
CISET
I
=10%×I
PQ
CHGMAX
= 4%×I
CHGMAX
with V
from 2.6V to 5.5V. Undervoltage lockout
SYS
I
TO
ensures that the step-down regulators do not operate
with SYS below 2.6V (typ).
In addition to setting the charge current, CISET also pro-
vides a means to monitor battery charge current. The
CISET output voltage tracks the charge current delivered
to the battery, and can be used to monitor the charge
rate, as shown in Figure 9. A 1.5V output indicates the
battery is being charged at the maximum set fast-charge
current, and 0V indicates no charging. This voltage is
also used by the charger control circuitry to set and
monitor the battery current. Avoid adding capacitance
See the Enable/Disable (EN) and Sequencing section
for how to enable and disable the step-down convert-
ers. When enabled, the MAX8671X gradually ramps
each output up during a soft-start time. Soft-start elimi-
nates input current surges when regulators are
enabled.
See the PWM section for information about the step-
down converters control scheme.
32 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
The MAX8671X uses external resistor-dividers to set the
step-down output voltages between 1V and V . Use at
least 10µA of bias current in these dividers to ensure no
change in the stability of the closed-loop system. To set
the output voltage, select a value for the resistor con-
reduces switching noise in the controller. The imped-
ance of the input capacitor at the switching frequency
must be less than that of the source impedance of the
supply so that high-frequency switching currents do not
pass through the input source.
SYS
nected between FB_ and AGND (R
). The recom-
FBL
The step-down regulator power inputs are critical dis-
continuous current paths that require careful bypass-
ing. In the PCB layout, place the step-down regulator
input bypass capacitors as close as possible to each
pair of switching regulator power input pins (PV_ to
PG_) to minimize parasitic inductance. If making con-
nections to these caps through vias, be sure to use
multiple vias to ensure that the layout does not insert
excess inductance or resistance between the bypass
cap and the power pins.
mended value is 100kΩ. Next, calculate the value of the
resistor connected from FB_ to the output (R ):
FBH
V
1.0V
⎛
⎞
⎠
OUT
R
=R
×
−1
⎟
⎜
⎝
FBH
FBL
REG1, REG2, and REG3 are optimized for high, medi-
um, and low output voltages, respectively. The highest
overall efficiency occurs with V1 set to the highest out-
put voltage and V3 set to the lowest output voltage.
The input capacitor must meet the input ripple current
requirement imposed by the step-down converter.
Ceramic capacitors are preferred due to their low ESR
and resilience to power-up surge currents. Choose the
input capacitor so that its temperature rise due to input
ripple current does not exceed about +10°C. For a
step-down DC-DC converter, the maximum input ripple
current is half of the output current. This maximum input
ripple current occurs when the step-down converter
PWM
The MAX8671X operates in either auto-PWM or forced-
PWM modes. At light load, auto PWM switches only as
needed to supply the load to improve light-load effi-
ciency of the step-down converter. At higher load cur-
rents (~100mA), the step-down converter transitions to
fixed 2MHz switching. Forced PWM always operates
with a constant 2MHz switching frequency regardless
of the load. This is useful in low-noise applications.
Permanently connect PWM high for forced-PWM appli-
cations or low for auto-PWM applications. Do not
change PWM on-the-fly.
operates at 50% duty factor (V = 2 x V
).
IN
OUT
Bypass each step-down regulator input with a 4.7µF
ceramic capacitor from PV_ to PG_. Use capacitors
that maintain their capacitance over temperature and
DC bias. Ceramic capacitors with an X7R or X5R tem-
perature characteristic generally perform well. The
capacitor voltage rating should be 6.3V or greater.
Step-Down Dropout and Minimum Duty Cycle
All the step-down regulators are capable of operating
in 100% duty-cycle dropout; however, REG1 has been
optimized for this mode of operation. During 100%
duty-cycle operation, the high-side p-channel MOSFET
turns on constantly, connecting the input to the output
Step-Down Output Capacitors
The output capacitance keeps output ripple small and
ensures control loop stability. The output capacitor
must have low impedance at the switching frequency.
Ceramic, polymer, and tantalum capacitors are suit-
able, with ceramic exhibiting the lowest ESR and lowest
high-frequency impedance. The MAX8671X requires at
least 20µF of output capacitance, which is best
achieved with two 10µF ceramic capacitors in parallel.
through the inductor. The dropout voltage (V ) is cal-
DO
culated as follows:
V
DO
= I (R + R )
LOAD P L
where:
RP = p-channel power switch RDS(ON)
RL = external inductor ESR
As the case sizes of ceramic surface-mount capacitors
decrease, their capacitance vs. DC bias voltage char-
acteristic becomes poor. Due to this characteristic, it is
possible for 0805 capacitors to perform well while 0603
capacitors of the same value might not. The MAX8671X
requires a nominal output capacitance of 20µF; howev-
er, after their DC bias voltage derating, the output
capacitance must be at least 15µF.
The minimum duty cycle for all step-down regulators is
12.5% (typ), allowing a regulation voltage as low as 1V
over the full SYS operating range. REG3 is optimized
for low duty-cycle operation.
Step-Down Input Capacitors
The input capacitor in a step-down converter reduces
current peaks drawn from the power source and
______________________________________________________________________________________ 33
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Step-Down Inductor
Choose the step-down regulator inductance to be
4.7µH. The minimum recommended saturation current
requirement is 600mA. In PWM mode, the peak induc-
tor currents are equal to the load current plus one half
of the inductor ripple current. The MAX8671X works
well with physically small inductors. See Table 6 for
suggested inductors.
where:
V
OUT
= output voltage
I
= target (desired) output current—cannot
OUTTAR
be more than the minimum p-channel current-limit
threshold
R
= n-channel on-resistance
N
R = p-channel on-resistance
P
The peak-to-peak inductor ripple current during PWM
operation is calculated as follows:
R = external inductor’s ESR
L
V
IN
= input voltage—MAXIMUM
MA8671X
V
(V
− V
)
2) Use the following equation to calculate the maximum
OUT SYS
OUT
I
=
P−P
output current (I
):
OUTMAX
V
× f ×L
SYS
S
V
(1−D)
OUT
I
−
where fS is the 2MHz switching frequency.
LIM
2× f ×L
I
=
OUTMAX
The peak inductor current during PWM operation is cal-
culated as follows:
1−D
1+(R +R )
N
L
2× f ×L
I
P−P
2
I
=I
+
L_PEAK LOAD
where:
LIM
I
= p-channel current-limit threshold—MINIMUM
V
= output voltage
Step-Down Converter Output Current
The three MAX8671X step-down regulators each pro-
vide at least 425mA of output current when using a rec-
ommended inductor (Table 6). To calculate the
maximum output current for a particular application and
inductor use the following two-step process (as shown
in Figure 10):
OUT
D = approximate duty cycle derived from step 1
f = oscillator frequency—MINIMUM
L = external inductor’s inductance—MINIMUM
R
= n-channel on-resistance
N
R = external inductor’s ESR
L
1) Use the following equation to calculate the approxi-
mate duty cycle (D):
V
V
+I
(R +R )
(R −R )
OUT OUTTAR N L
D =
+I
IN OUTTAR N P
Table 6. Suggested Inductors
INDUCTANCE
(µH)
CURRENT RATING
MANUFACTURER
SERIES
ESR (Ω)
DIMENSIONS (mm)
(mA)
CDRH2D11HP
CDH2D09
NR3012
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
190
218
130
190
160
240
130
180
750
700
770
750
740
700
880
640
3.0 x 3.0 x 1.2 = 10.8mm3
3.0 x 3.0 x 1.0 = 9.0mm3
3.0 x 3.0 x 1.2 = 10.8mm3
3.0 x 3.0 x 1.0 = 9.0mm3
2.8 x 2.6 x 1.2 = 8.7mm3
2.8 x 2.6 x 1.0 = 7.3mm3
3.0 x 2.8 x 1.2 = 10.8mm3
3.0 x 2.8 x 1.0 = 8.4mm3
Sumida
Taiyo Yuden
TDK
NR3010
VLF3012
VLF3010
DE2812C
DE2810C
TOKO
34 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
TO FIND THE MAXIMUM OUTPUT CURRENT FOR REG3 WITH V = 3.2V TO 5.3V, V
=1.2V, L = 4.7μH
IN
OUT
20%, AND R =130mΩ:
L
V
V
+I
(R +R ) 1.2V + 0.425A(0.12Ω + 0.13Ω)
OUT OUTTAR N L
D =
=
= 0.249
+I
(R −R )
5.3V + 0.425A(0.12Ω − 0.23Ω)
1.2V(1− 0.249)
IN OUTTAR
N
P
V
(1−D)
0.555A −
OUT
I
−
−6
6
LIM
2×(1.8×10 Hz)×(4.7×10 H× 0.8)
1− 0.249
2× f ×L
I
=
=
= 0.482A
OUTMAX
1−D
1+(R +R )
1+(0.12Ω + 0.13Ω)
N
L
6
−6
2× f ×L
2×(1.8×10 Hz)×(4.7×10 H× 0.8)
Figure 10. Step-Down Converter Maximum Output Current Example
mended value is 60.4kΩ. Next, calculate the value of
the resistor connected from FB_ to the output (R ):
Linear Regulators (REG4, REG5)
The REG4 and REG5 linear regulators have low quies-
cent current, and low output noise. Each regulator sup-
plies up to 180mA to its load. Bypass each LDO output
with a 2.2µF or greater capacitor to ground. If V4 or V5
is set to less than 1.5V, bypass the output with 3.3µF or
greater.
FBH
⎛ V
⎞
⎠
OUT
R
=R
×
−1
⎟
⎜
FBH
FBL
⎝
0.6V
For REG4, an external 0.01µF bypass capacitor from
BP to AGND in conjunction with a 150kΩ internal resis-
tor creates a 110Hz lowpass filter for noise reduction.
BP is a high-impedance node and requires a low-leak-
age capacitor. For example, a leakage of 40nA results
in a 1% error.
Each linear regulator has an independent power input
(PV4 and PV5) with an input voltage range from 1.7V to
V
(V
can be up to 5.5V). Voltages below the
SYS
SYS
input undervoltage lockout threshold (1.6V) are invalid.
The regulator inputs can be driven from an efficient
low-voltage source, such as a DC-DC output, to opti-
mize efficiency (see the following equation). Bypass
each LDO input with a 1µF or greater capacitor to
ground:
VL Linear Regulator
VL is the output of a 3.3V linear regulator that powers
MAX8671X internal circuitry. VL is internally powered
from the higher of USB or DC and automatically powers
up when either of these power inputs exceeds approxi-
mately 1.5V. When the higher of the DC and USB sup-
ply is between 1.5V and 3.3V, VL operates in dropout.
VL automatically powers down when both the USB and
DC power inputs are removed. Bypass VL to AGND
with a 0.1µF capacitor.
V
V
OUT
Efficiency
≈
LDO
IN
REG5 is intended to power the system USB transceiver
circuitry and is only active when USB power is avail-
able. REG4 is powered from the battery when power is
not available at DC or USB.
VL remains on even when USB and/or DC are in over-
voltage or undervoltage lockout, when SYS is in under-
voltage lockout, and also during thermal faults.
See the Enable/Disable (EN) and Sequencing section
for how to enable and disable the linear regulators.
When enabled, the linear regulators soft-start by ramp-
ing their outputs up to their target voltage in 3ms. Soft-
start limits the inrush current when the regulators are
enabled.
VL sources up to 3mA for external loads. If VL is not
used for external loads, the MAX8671X’s USB/DC cur-
rent limit guarantees compliance with the USB 2.0 input
current specifications. If VL is used for external loads,
USB/DC currents increase and might exceed the limits
outlined in the USB 2.0 specification. For example, if the
USB to SYS current is limited to 95mA and VL is sourc-
The MAX8671X uses external resistor-dividers to set
the LDO output voltages between 0.6V and V
. Use
PV_
at least 10µA of bias current in these dividers to ensure
no change in the stability of the closed-loop system. To
set the output voltage, select a value for the resistor
ing 3mA, I
is 98mA. Similarly, if the USB input is sus-
USB
pended and VL is sourcing 3mA, I
is 3mA.
USB
connected between FB_ and AGND (R
). The recom-
FBL
______________________________________________________________________________________ 35
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
SYS
SYSOK
2.5V FALLING
100mV HYST
PV4
DIE TEMP
MAX8671X
PV4OK
PV5OK
DT165
1.6V RISING
100mV HYST
+165°C
PV5
USB
MA8671X
SOFT-START
REG3
1.6V RISING
100mV HYST
USBOVLO
USBUVLO
REGON
OK
REG3OK
REG1OK
EN
6.9V RISING
400mV HYST
USBPOK
SOFT-START
REG1
4.0V RISING
500mV HYST
REGON
REG3OK
OK
EN
DC
DCOVLO
DCUVLO
SOFT-START
REG2
6.9V RISING
400mV HYST
DCPOK
OK
REG2OK
EN
4.0V RISING
500mV HYST
SOFT-START
REG4
REGON
REG3OK
REG1OK
REG2OK
PV4OK
EN
2MHz
OSC
REG4OK
OK
EN
BIAS
&
REF
DT165
SYSOK
SOFT-START
REG5
64 CYCLE
DELAY
(32ms)
REGON
REGON
REG3OK
REG1OK
REG2OK
REG4OK
PV5OK
REG5OK
OK
EN
Figure 11. Enable/Disable Logic
REG1–REG5. REG5 is intended to power the system
USB transceiver circuitry, which is only active when
USB power is available. Therefore, a valid source must
be on either the USB or DC input for REG5 to enable.
Enable/Disable (EN) and Sequencing
Figures 11, 12, and 13 show how the five MAX8671X
regulators are enabled and disabled. With a valid SYS
voltage and die temperature, asserting EN high
enables REG1–REG4. Pulling EN low disables
36 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
V
DC
V
USB
V
VL
V
< V < (V
SYS
OR V )
USB DC
BAT
V
SYS
V
V
BAT
BAT
t
D1
V
EN
t
SS1
V
OUT1
t
SS2
V
OUT2
t
D2
t
SS3
V
OUT3
t
D3
t
SS4
V
OUT4
t
SS5
V
OUT5
INTERNAL
DISCHARGE
RESISTORS
HIGH-Z
HIGH-Z
V
UOK
HIGH-Z
HIGH-Z
V
DOK
Figure 12. Enable and Disable Waveforms
The VL regulator is not controlled by EN. It is powered
from the higher of USB or DC and automatically powers
up when either of the power inputs exceeds approxi-
mately 1.5V. Similarly, VL automatically powers down
when both the USB and DC power inputs are removed.
ages, and to fully comply with the USB 2.0 specifica-
tions. All USB, DC, and charging functions implement
soft-start. The USB and DC nodes only require 4.7µF of
input capacitance. Furthermore, all regulators imple-
ment soft-start to avoid transient overload of power
inputs (Figure 12).
Soft-Start/Inrush Current
The MAX8671X implements soft-start on many levels to
control inrush current, to avoid collapsing supply volt-
______________________________________________________________________________________ 37
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ing range. When the USB voltage is less than the USB
UVLO threshold (4.0V typ), the USB input is discon-
nected from SYS, and UOK goes high impedance.
When the DC voltage is less than the DC UVLO thresh-
old (4.0V typ), the DC input is disconnected from SYS,
and DOK goes high impedance. In addition, when both
USB and DC are in UVLO, the battery charger is dis-
abled, and BAT is connected to SYS through the inter-
nal system load switch. REG1–REG4 are allowed to
operate from the battery without power at USB or DC.
REG5 is intended to power the system USB transceiver
circuitry, which is only active when USB power is avail-
able. Therefore, a valid source must be present on
either the USB or DC input for REG5 to enable.
Active Discharge in Shutdown
Each MAX8671X regulator (REG1–REG5) has an inter-
nal 1kΩ resistor that discharges the output capacitor
when the regulator is off. The discharge resistors
ensure that the load circuitry powers down completely.
The internal discharge resistors are connected when a
regulator is disabled and when the device is in UVLO
with an input voltage greater than 1.0V. With an input
voltage less than 1.0V, the internal discharge resistors
are not activated.
MA8671X
Undervoltage and Overvoltage Lockout
USB/DC UVLO
Undervoltage lockout (UVLO) prevents an input supply
from being used when its voltage is below the operat-
UNPLUGGING USB WITH NOTHING TO DISCHARGE C (V = 3.3V). V5 SET FOR 3.3V
USB BAT
UNPLUG
EVENT
5V
RAPID DISCHARGE UNTIL V
DECAYS
USB
TO THE HIGHER OF 3.5V OR V + 5OmV
BAT
V
USB
3.5V
SLOW DISCHARGE AS THE MAX8671X
DRAWS USB QUIESCENT CURRENT
HIGH-Z
V
UOK
V5
t
DDREG5 = 120μs (typ)
IF V ≥ 3.4V, V WILL REGULATE TO 3.3V
BAT
PV5
IF V ≤ 3.4V, V WILL BE SLIGHTLY LESS
BAT
PV5
THAN V (DROPOUT)
BAT
Figure 13. REG5 Disable Detail
38 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
USB/DC OVLO
Overvoltage lockout (OVLO) prevents an input supply
from being used when its voltage exceeds the operat-
ing range. Both USB and DC withstand input voltages
up to 14V. When the USB voltage is greater than the
USB OVLO threshold (6.9V typ), the USB input is dis-
connected from SYS, and UOK goes high impedance.
When the DC voltage is greater than the DC OVLO
threshold (6.9V typ), the DC input is disconnected from
SYS, and DOK goes high impedance. In addition, when
both DC and USB are in OVLO, the battery charger is
disabled, and BAT is connected to SYS through the
internal system load switch. REG1–REG4 are allowed to
operate from the battery when USB and DC are in over-
voltage lockout. The VL supply remains active in OVLO.
REG5 is intended to power the system USB transceiver
circuitry, which is only active when USB power is avail-
able. A valid source must be present on either the USB
or DC input for REG5 to enable.
Smart Power Selector Thermal-Overload Protection
The MAX8671X reduces the USB and DC current limits
by 5%/°C when the die temperature exceeds +100°C.
The system load (I
) has priority over the charger
SYS
current, so input current is first reduced by lowering
charge current. If the junction temperature still reaches
+120°C in spite of charge-current reduction, no input
current is drawn from USB and DC; the battery supplies
the entire load and SYS is regulated 82mV (V
)
BSREG
below BAT. Note that this on-chip thermal-limiting cir-
cuit is not related to and operates independently from
the thermistor input.
Regulator Thermal-Overload Shutdown
The MAX8671X disables all regulator outputs (except
VL) when the junction temperature rises above +165°C,
allowing the device to cool. When the junction tempera-
ture cools by approximately 15°C, the regulators
resume the state indicated by the enable input (EN)
by repeating their soft-start sequence. Note that this
thermal-overload shutdown is a fail-safe mechanism;
proper thermal design should ensure that the junction
temperature of the MAX8671X never exceeds the
absolute maximum rating of +150°C.
SYS UVLO
A UVLO circuit monitors the voltage from SYS to
ground (V
). When V
falls below V
(2.5V
SYS
SYS
UVLO_SYS
typ), REG1–REG5 are disabled. V
has a
UVLO_SYS
100mV hysteresis. The VL supply remains active in SYS
UVLO.
Battery Charger Thermistor Input (THM)
The THM input connects to an external negative tem-
perature coefficient (NTC) thermistor to monitor battery
or system temperature. Charging is suspended when
the thermistor temperature is out of range. Additionally,
the charge timers are suspended and charge status
indicators report that the charger is in thermistor sus-
pend (CST[1:2] = 01). When the thermistor comes back
into range, charging resumes and the charge timer
continues from where it left off. Table 8 shows THM
temperature limits for various thermistor material con-
stants. If the battery temperature monitor is not
REG4/REG5 UVLO
A UVLO circuit monitors the PV4 and PV5 LDO power
inputs. When the PV_ voltage is below 1.6V, it is invalid
and the LDO is disabled.
Thermal Limiting and Overload Protection
The MAX8671X is packaged in a 5mm x 5mm x 0.8mm
40-pin thin QFN. Table 7 shows the thermal character-
istics of this package. The MAX8671X has several
mechanisms to control junction temperature in the
event of a thermal overload.
required, bias THM midway between V and AGND
L
with a resistive divider—100kΩ 5% resistors are rec-
ommended. Biasing THM midway between V and
L
Table 7. 5mm x 5mm x 0.8mm Thin QFN
Thermal Characteristics
AGND bypasses this function.
SINGLE-LAYER PCB MULTILAYER PCB
1777.8mW
2857.1mW
Continuous
Power
Dissipation
Derate 22.2mW/°C
above +70°C
45°C/W
Derate 35.7mW/°C
above +70°C
28°C/W
*θ
JA
θ
1.7°C/W
1.7°C/W
JC
*θ is specified according to the JESD51 standard.
JA
______________________________________________________________________________________ 39
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table 8. Trip Temperatures for Different Thermistors
THERMISTOR BETA (ß [K])
3000
10
3250
10
3500
10
3750
10
4250
10
4250
10
R
R
R
(kΩ)
(kΩ)
(kΩ)
TB
TP
TS
Open
Short
10
Open
Short
10
Open
Short
10
Open
Short
10
Open
Short
10
120
Short
10
Resistance at +25°C [kΩ]
Resistance at +50°C [kΩ]
Resistance at 0°C [kΩ]
4.59
25.14
4.30
27.15
4.03
29.32
3.78
31.66
3.32
36.91
3.32
36.91
MA8671X
Nominal Hot Trip
Temperature [°C]
55
-3
53
-1
51
0
49
2
46
5
45
0
Nominal Cold Trip
Temperature [°C]
VL
CEN
R
TB
0.74 x VL
ALTERNATE THERMISTOR
CONFIGURATION
COLD
HOT
THM
TEMPERATURE
SUSPEND
0.284 x VL
R
TS
T
R
TP
ESD
DIODE
T
BOTH COMPARATORS
HAVE 65mV HYSTERESIS
MAX8671X
AGND
Figure 14. Thermistor Input
Since the thermistor monitoring circuit employs an
external bias resistor from THM to VL (R in Figure
where:
TB
R
= The resistance in ohms of the thermistor at tem-
T
14), any resistance thermistor can be used as long as
perature T in Celsius
the value of R is equivalent to the thermistor’s +25°C
TB
R
= The resistance in ohms of the thermistor at
25
+25°C
resistance. For example, with a 10kΩ at +25°C thermis-
tor, use 10kΩ at R , and with a 100kΩ at +25°C ther-
TB
mistor, use 100kΩ at R . The general relation of
β = The material constant of the thermistor that typically
ranges from 3000K to 5000K
TB
thermistor resistance to temperature is defined by the
following equation:
T = The temperature of the thermistor in °C that corre-
sponds to R
T
⎧
⎫
1
1
⎛
⎝
⎞
⎠
R =R × e β
−
⎨ ⎜
⎟⎬
T
25
T +273 298
⎩
⎭
40 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
THM threshold adjustment can be accommodated by
changing R , connecting a resistor in series and/or in
TB
TOP VIEW
parallel with the thermistor, or using a thermistor with dif-
ferent material constant (β). For example, a +45°C hot
threshold and 0°C cold threshold can be realized by
using a 10kΩ thermistor with a β of 4250K and connect-
ing 120kΩ in parallel. Since the thermistor resistance
near 0°C is much higher than it is near +50°C, a large
parallel resistance lowers the cold threshold, while only
slightly lowering the hot threshold. Conversely, a small
series resistance raises the cold threshold, while only
8671XE
TLyww
+ aaaa
THIN QFN
5mm x 5mm x 0.8mm
slightly raising the hot threshold. Raising R
lowers
TB
both the hot and cold thresholds, while lowering R
raises both thresholds.
TB
Figure 15. Package Marking Example
PCB Layout and Routing
Good printed circuit board (PCB) layout is necessary to
achieve optimal performance. Refer to the MAX8671
evaluation kit for Maxim’s recommended layout.
• The REG4 LDO is a high-performance LDO with
high PSRR and low noise and care should be used
in the layout to obtain the high performance.
Generally, the REG4 LDO is powered from a step-
down regulator output, and therefore, its input
capacitor should be bypassed to the power ground
plane. However, its output capacitor should be
bypassed to the analog ground plane.
Use the following guidelines for the best results:
• Use short and wide traces for high-current and dis-
continuous current paths.
• The step-down regulator power inputs are critical
discontinuous current paths that require careful
bypassing. Place the step-down regulator input
bypass capacitors as close as possible to each
switching regulator power input pair (PV_ to PG_).
• BP is a high impedance node and leakage current
into or out of BP can affect the LDO output accuracy.
Package Marking
The top of the MAX8671X package is laser etched as
shown in Figure 15:
• Minimize the area of the loops formed by the step-
down converters’ dynamic switching currents.
• “8671XETL” is the product identification code. The
full part number is MAX8671XETL; however, in this
case, the “MAX” prefix is omitted due to space
limitations.
• The exposed paddle (EP) is the main path for heat
to exit the IC. Connect EP to the ground plane with
thermal vias to allow heat to dissipate from the
device.
• “yww” is a date code. “y” is the last number in the
Gregorian calendar year. “ww” is the week number
in the Gregorian calendar. For example:
• The MAX8671X regulator feedback nodes are sensi-
tive high-impedance nodes. Keep these nodes as
short as possible and away from the inductors.
“801” is the first week of 2008; the week of
January 1st, 2008
• The thermistor node is high impedance and should
be routed with care.
“052” is the fifty-second week of 2010; the
week of December 27th, 2010.
• Make power ground connections to a power ground
plane. Make analog ground connections to an ana-
log ground plane. Connect the ground planes at a
single point.
“aaaa” is an assembly code and lot code.
“+” denotes lead-free packaging and marks
the pin 1 location.
Chip Information
PROCESS: BiCMOS
______________________________________________________________________________________ 41
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
20
31
32
33
EN
CISET
CT
19 FB1
18 AGND
THM
17
16
BVSET
PV4
BAT 34
MA8671X
35
36
37
38
39
40
SYS
PEN1
CST2
UOK
MAX8671X
15 OUT4
14
BP
13 FB4
12
DOK
11 FB2
CST1
PEN2
EXPOSED PADDLE (EP)
+
1
2
3
4
5
6
7
8
9
10
THIN QFN
5mm x 5mm x 0.8mm
42 ______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MA8671X
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
______________________________________________________________________________________ 43
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
MA8671X
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
44 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products. Inc.
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