MAX8808YETA [MAXIM]
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN; 1A线性锂离子电池充电器，带有集成调整FET和采用2mm x 2mm TDFN热调节
| 型号： | MAX8808YETA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN |
| 文件： | 总13页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3670; Rev 0; 4/05
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
General Description
Features
The MAX8808X/MAX8808Y/MAX8808Z intelligent,
stand-alone constant-current/constant-voltage (CCCV),
thermally regulated linear chargers are designed for
charging a single-cell lithium-ion (Li+) battery. The
MAX8808X/MAX8808Y/MAX8808Z integrate the cur-
rent-sense circuit, MOS pass element, and thermal-reg-
ulation circuitry, and eliminate the reverse-blocking
Schottky diode to create the simplest and smallest
charging solution for handheld equipment.
♦ Stand-Alone Linear 1-Cell Li+ Battery Charger
♦ No External FET, Reverse Blocking Diode, or
Current-Sense Resistor Required
♦ Programmable Fast-Charge Current (1A max)
♦ Proprietary Die Temperature Regulation Control
(+115°C)
♦ +4.25V to +15V Input Voltage Range with Input
OVP Above +7V
The MAX8808X functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full-
charge indication. The MAX8808Y and MAX8808Z elimi-
nate the prequalification state to allow startup into a load
without a battery. Proprietary thermal-regulation circuitry
limits the die temperature when fast-charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
♦ Charge-Current Monitor for Fuel Gauging
♦ Low Dropout Voltage—300mV at 500mA
♦ Input Power-Source Detection Output (ACOK) and
Charge-Enable Input (EN or EN)
♦ Soft-Start Limits Inrush Current
♦ Charge-Status Output (CHG) for LED or
Microprocessor (µP) Interface
The MAX8808X/MAX8808Y/MAX8808Z achieve high
flexibility by providing an adjustable fast-charge current
with an external resistor. Other features include a bat-
tery charging-status indicator (CHG), an active-low con-
trol input (EN) for the MAX8808X and MAX8808Z
(active-high control input for the MAX8808Y), and an
active-low input power-source detection output (ACOK).
♦ Tiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm
(max) Height
Ordering Information
TOP
MARK
PART
PIN-PACKAGE
The MAX8808X/MAX8808Y/MAX8808Z accept a
+4.25V to +15V supply, but disable charging when the
input voltage exceeds +7V to protect against unquali-
fied or faulty AC adapters. The MAX8808X/MAX8808Y/
MAX8808Z operate over the extended temperature
range (-40°C to +85°C) and are available in a compact
8-pin thermally enhanced 2mm x 2mm TDFN package
with 0.8mm (max) height.
MAX8808XETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
MAX8808YETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
MAX8808ZETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
AAC
AAB
AAA
All devices specified over the -40°C to +85°C operating range.
+Denotes lead-free package.
*EP = Exposed paddle.
Applications
Cellular and Cordless Phones
Smartphones and PDAs
Typical Operating Circuit
4.25V TO 15V
IN
BATT
4.2V
Li+
Digital Still Cameras and MP3 Players
USB Appliances
MAX8808X
MAX8808Y
MAX8808Z
CHG
EN*
Charging Cradles and Docks
Bluetooth® Equipment
OFF
ACOK
VL
ON
ISET
GND
Pin Configuration appears at end of data sheet.
*MAX8808Y USES ACTIVE-HIGH LOGIC FOR EN.
Bluetooth is a registered trademark of Bluetooth SIG.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
ABSOLUTE MAXIMUM RATINGS
IN to GND...............................................................-0.3V to +16V
VL, BATT, EN, ACOK, CHG to GND.........................-0.3V to +6V
VL, ISET to GND.......................................................-0.3V to +4V
VL to IN................................................................-16.3V to +0.3V
IN to BATT Continuous Current.............................................1.5A
BATT Short-Circuit Duration.......................................Continuous
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Continuous Power Dissipation (T = +70°C)
A
8-Pin 2mm x 2mm TDFN (derate 15.4mW/°C
above +70°C).............................................................1234mW
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
(V = 5V, V
MAX8808Y), R
= 4.0V, R
= R
= 100kΩ to 5V, EN = unconnected (for the MAX8808X and MAX8808Z), EN = VL (for the
IN
BATT
ACOK
CHG
VL
= 2.8kΩ to GND, C = 0.47µF, C
= 1µF, T = -40°C to +85°C, unless otherwise noted. Typical values are at
BATT A
ISET
T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
0
TYP
MAX
15
UNITS
Input Voltage Range
V
V
Input Operating Range
4.25
15
6.50
60
V
V
rising
falling
40
30
IN
IN
ACOK Threshold
V
V
- V
, 10mV hysteresis (typ)
mV
V
IN
IN
BATT
10
45
Overvoltage-Lockout Trip Point
rising, 100mV hysteresis (typ)
6.5
7
7.5
Charging (I - I
)
0.8
0.23
2
IN BATT
IN Input Current
mA
Disabled
OFF state (V = V
0.50
0.065
= 4.0V)
IN
BATT
VL Output Voltage
VL Load Regulation
I
I
= 100µA
3.0
-5
V
VL
VL
= 100µA to 2mA
-30
mV
VL Undervoltage-Lockout Trip
Point
V
V
rising, 100mV hysteresis (typ)
= 0 to 4V
2.74
V
VL
1
1
10
10
IN
BATT Input Current
µA
Disabled
Maximum RMS Charge Current
Battery Regulation Voltage
1
A
RMS
I
= 1mA
4.162
4.200
2.2
4.238
V
BATT
Minimum BATT Bypass
Capacitance
µF/A
mA
Fast-Charge Current Loop
System Accuracy
V
= 3.5V
T
= 0°C to +85°C
A
418
465
512
BATT
2
_______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V = 5V, V
MAX8808Y), R
= 4.0V, R
= R
= 100kΩ to 5V, EN = unconnected (for the MAX8808X and MAX8808Z), EN = VL (for the
IN
BATT
ACOK
CHG
VL
= 2.8kΩ to GND, C = 0.47µF, C
= 1µF, T = -40°C to +85°C, unless otherwise noted. Typical values are at
BATT A
ISET
T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Percentage of the fast-charge current, V
MAX8808X
= 2.2V,
BATT
Prequal Charge Current
5
10
15
%
Die Temperature Regulation
Threshold
+115
2.5
°C
V
V
Prequal Threshold Voltage
V
rising, MAX8808X
BATT
2.3
2.7
BATT
Current-Sense Amplifier Gain,
to I
I
= 500mA, V
= 1.4V
T = 0°C to +85°C
A
0.97
1.08
1.19
mA/A
BATT
ISET
I
BATT
ISET
Regulator Dropout Voltage
(V - V
V
= 4.1V, I
= 425mA
250
430
mV
BATT
BATT
)
BATT
IN
EN/EN Logic Input Low Voltage
EN/EN Logic Input High Voltage
EN Internal Pulldown Resistor
4.25V < V < 6.5V
0.52
V
V
IN
4.25V < V < 6.5V
1.3
IN
MAX8808X and MAX8808Z only
100
200
400
1
kΩ
T
= +25°C
= +85°C
A
A
EN Input Leakage Current
MAX8808Y, V = 5.5V
µA
V
EN
T
0.002
CHG Output Low Voltage
I
= 5mA
= 5.5V
0.4
1
CHG
T
T
= +25°C
= +85°C
A
CHG Output High Leakage
Current
V
µA
V
CHG
0.002
A
ACOK Output Low Voltage
I
= 5mA
= 5.5V
0.4
1
ACOK
T
T
= +25°C
= +85°C
A
ACOK Output High Leakage
Current
V
µA
ACOK
0.002
10
A
Full-Battery Detection Current
Threshold
I
falling, percentage of the fast-charge current
5
15
%
BATT
Note 1: Specifications are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by
A
design and characterization.
_______________________________________________________________________________________
3
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Typical Operating Characteristics
(V = 5V, V
unless otherwise noted.)
= 4.0V, ACOK = EN = unconnected, R
= 2.8kΩ to GND, C = 1µF, C
= 1µF, C = 0.47µF, T = +25°C,
IN
BATT
ISET
IN
BATT
VL
A
SUPPLY CURRENT
vs. INPUT VOLTAGE
DISABLED-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
CHARGE CURRENT
vs. BATTERY VOLTAGE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
800
700
600
500
400
300
200
100
0
1000
900
800
700
600
500
400
300
200
100
0
MAX8808Y/
MAX8808Z
MAX8808X
V
V
= 5V OR
= 0V
EN
EN
0
2
4
6
8
10 12 14 16
0
2
4
6
8
10 12 14 16
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
(V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
V
BATT
CHARGE CURRENT
vs. INPUT VOLTAGE
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
1000
900
800
700
600
500
400
300
200
100
0
1000
900
800
700
600
500
400
300
200
100
0
0
2
4
6
8
10
12
14
0
50 100 150 200 250 300 350 400 450 500
(V - V ) (mV)
V
(V)
IN
IN
BAT
BATTERY REGULATION VOLTAGE
vs. AMBIENT TEMPERATURE
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
4.240
4.230
4.220
4.210
4.200
4.190
4.180
4.170
4.160
4.150
600
550
500
450
400
350
300
250
200
V
= 4V
BATT
V
= 3.2V
BATT
-40
-15
10
35
60
85
-40
-15
10
35
60
85
T
(°C)
A
T
(°C)
A
4
_______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Pin Description
PIN
1
NAME
IN
FUNCTION
Input Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to improve line
noise and input transient rejection.
2
VL
Internally Generated Logic Supply for IC. Bypass VL to GND with a 0.47µF ceramic capacitor.
Ground. Connect GND and exposed pad to a large copper ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.
3
GND
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 1.08mA
per amp of battery charging current. Set the charging current by connecting a resistor from ISET
4
5
ISET
to GND. Fast-charge current = 1302V / R
Ω.
ISET
Charging Indicator. CHG is an open-drain output that goes low (LED capable) when charging
begins. CHG is high impedance when the battery current drops below 10% of the fast-charging
current, or when the IC is disabled. Connect a pullup resistor to the µP’s I/O voltage when
interfacing with a µP logic input.
CHG
EN
Logic-Level Enable Input. Drive EN high to disable charger. Pull EN low or leave unconnected for
normal operation. EN has an internal 200kΩ pulldown resistor.
(MAX8808X/
MAX8808Z)
6
7
EN
Logic-Level Enable Input. Drive EN low to disable charger. Pull EN high for normal operation. EN
has no internal pullup or pulldown resistor.
(MAX8808Y)
Input Status Indicator. ACOK is an open-drain output that asserts low when V < +7V and (V
–
IN
IN
V
) ≥ 40mV. ACOK requires an external 100kΩ pullup resistor. ACOK is high impedance
BATT
ACOK
during shutdown.
Li+ Battery Connection. Bypass BATT to GND with a ceramic capacitor of at least 2.2µF per
ampere of charge current.
8
BATT
EP
Exposed Paddle. Connect the exposed paddle to a large ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.
—
_______________________________________________________________________________________
5
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
exceeds 2.5V, the charger soft-starts as it enters the
Detailed Description
fast-charge stage. In the MAX8808X/MAX8808Y/
The MAX8808X/MAX8808Y/MAX8808Z chargers use
MAX8808Z, the fast-charge current level is pro-
voltage, current, and thermal-control loops to charge a
grammed through a resistor from ISET to GND. As the
single Li+ cell and protect the battery (Figure 1). When
battery voltage approaches 4.2V, the charging current
a Li+ battery with a cell voltage below 2.5V is inserted,
is reduced. If the battery current drops to less than
the MAX8808X charger enters the prequalification
10% of the fast-charging current, the CHG indicator
stage where it precharges that cell with 10% of the
goes high impedance, signaling that the battery is fully
user-programmed fast-charge current (Figure 2). The
charged. The ICs then enter a constant voltage-regula-
CHG indicator output is driven low to indicate entry into
tion mode to maintain the battery at full charge.
the prequalification state. When battery voltage
4.25V TO 15V
BATT
IN
1µF
1µF
+115°C
OUTPUT DRIVER, CURRENT
SENSE, AND LOGIC
TEMP
SENSOR
ISET
2.8kΩ
V
REF
I
REF
V
I/O
IN
100kΩ
IN
MAX8808X
MAX8808Y
MAX8808Z
VL
VL
ACOK
BATT
0.47µF
EN (MAX8808Y)
UVLO
IN
V
I/O
EN
ON
REF
OVP
LOGIC
(MAX8808X/
MAX8808Z)
100kΩ
CHG
REF OK
200kΩ
N
GND
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
SHUTDOWN
CHARGER = OFF
CHG = HIGH
ASYNCHRONOUS
FROM ANYWHERE
V
BATT
< 2.5V
V
> 7V OR
> V OR
IN
V
IN
> 7V OR
V
BATT IN
MAX8808X
V
BATT
> V OR
IN
IC DISABLED
PREQUAL
10% CHARGE CURRENT
CHG = LOW
IC DISABLED
V
< 2.4V
BATT
MAX8808Y/
MAX8808Z
V
> 2.5V
BATT
FAST-CHARGE
100% CHARGER CURRENT
CHG = LOW
I
< 10%
SET
CHARGE
OF I
I
> 20%
SET
CHARGE
OF I
TOP-OFF
CHG = HIGH
TOP-OFF CONTINUES
TO REGULATE BATT AT
4.2V
Figure 2. Charge-State Diagram
Thermal Regulation
charger-control circuitry. EN has a 200kΩ internal pull-
The thermal-regulation loop limits the MAX8808X/
MAX8808Y/MAX8808Z die temperature to +115°C by
reducing the charge current as necessary. This feature
not only protects the ICs from overheating, but also
allows a higher charge current without risking damage
to the system.
down resistor.
The MAX8808Y contains an active-high enable input
(EN) to enable the charger. Drive EN high to enable the
charge-control circuitry. Drive EN low to disable the
charger-control circuitry. Do not leave EN floating. It
has no internal pullup or pulldown resistor.
EN (MAX8808X/MAX8808Z) and EN
(MAX8808Y) Charger Enable Input
The MAX8808X/MAX8808Z contain an active-low logic
input (EN) used to enable the charger. Drive EN low,
leave floating, or connect to GND to enable the
charge-control circuitry. Drive EN high to disable the
ACOK Output
The open-drain ACOK output asserts low when +4.25V
≤ V ≤ +7V and V - V ≥ 40mV. ACOK requires
BATT
an external pullup resistor (100kΩ typ). ACOK is high
IN
IN
impedance during shutdown.
_______________________________________________________________________________________
7
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Calculate R
as follows:
VL Internal Voltage Regulator
The MAX8808X/MAX8808Y/MAX8808Z linear chargers
contain an internal linear regulator to supply the power
for the IC. Bypass VL to GND with a 0.47µF ceramic
capacitor. VL is regulated to 3.0V whenever the input
voltage is above the battery voltage.
ISET
R
= 1302V / I
FASTCHG
ISET
where I
is in Amps and R
is in Ohms. ISET
ISET
FASTCHG
can be used to monitor the fast-charge current level.
The output current from ISET is 1.08mA per amp of
charging current. The output voltage at ISET is propor-
tional to the charging current:
CHG Charge-Indicator Output
CHG is an open-drain output that indicates charge sta-
tus. Table 1 describes the state of CHG during different
stages of operation. CHG is suitable for driving a
charge-indication LED. If the MAX8808X/MAX8808Y/
MAX8808Z is used in conjunction with a µP, a pullup
resistor to the logic I/O voltage allows CHG to indicate
charge status to the µP instead of driving an LED.
V
= (I
x R
) / 930
ISET
ISET
CHARGE
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged or as the thermal-regu-
lation circuitry activates.
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 1µF X5R ceramic capacitor for
most applications. Connect a 1µF ceramic capacitor
from IN to GND. Use a larger input bypass capacitor
for high charging currents to reduce supply noise.
Connect a 0.47µF ceramic capacitor from VL to GND.
Soft-Start
The soft-start algorithm activates when entering fast-
charge mode. In the MAX8808X, when the prequalifica-
tion state is complete (V
exceeds +2.5V), the
BATT
charging current ramps up in 1ms to the full charging
current. This reduces the inrush current on the input
supply. Note that the MAX8808Y and MAX8808Z do not
have a prequalification state and enter soft-start directly
after being enabled.
Thermal Considerations
The MAX8808X/MAX8808Y/MAX8808Z are available in
a thermally enhanced TDFN package with exposed
paddle. Connect the exposed paddle to a large cop-
per ground plane to provide a thermal contact
between the device and the circuit board for increased
power dissipation. The exposed paddle transfers heat
away from the device, allowing the ICs to charge the
battery with maximum current, while minimizing the
increase in die temperature.
Applications Information
Charge-Current Selection
The maximum charging current is programmed by an
external resistor connected from ISET to GND (R
).
ISET
Table 1. CHG States
EN
MAX8808X
EN
MAX8808Y
EN
MAX8808Z
V
IN
V
BATT
I
CHG
STATE
BATT
X
X
X
≤V
≥V
0
High-Impedance
Low
Shutdown
Prequal
BATT
IN
Low
Low
Low
Low
High
—
—
4.25V ≤ V ≤ 7V
<2.4V
≥2.5V
4.2V
X
10% of I
FAST
IN
High
High
High
Low
Low
Low
Low
High
4.25V ≤ V ≤ 7V
I
*
FAST
Low
Fast-Charge
Top-off
IN
4.25V ≤ V ≤ 7V
<10% of I
High-Impedance
High-Impedance
High-Impedance
IN
FAST
>7V
X
0
0
Shutdown
Disabled
X
X = Don’t care.
— = Prequal not applicable to MAX8808Y and MAX8808Z.
*I
is reduced as necessary to prevent the die temperature from exceeding +115°C.
FAST
8
_______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
greater than 7V, the internal overvoltage-protection cir-
cuitry disables charging until the input falls below 7V.
An appropriate power supply must provide at least
4.25V at the desired peak charging current. It also must
stay below 6.5V when unloaded.
DC Input Sources
The MAX8808X/MAX8808Y/MAX8808Z operate from
well-regulated DC sources. The full charging input volt-
age range is 4.25V to 7V. The device can withstand up
to 15V on the input without damage to the IC. If V is
IN
Application Circuits
V
Stand-Alone Li+ Charger
The MAX8808X/MAX8808Y/MAX8808Z provide a com-
plete Li+ charging solution. Figure 3 shows a stand-
alone Li+ battery charger. The 2.8kΩ resistor
connected to ISET sets a charging current of 465mA.
The LED connected to the CHG output indicates when
either fast-charge or precharge qualification has
begun. When the battery is full, CHG turns high imped-
ance and the LED turns off.
I/O
R2
510Ω
R3
100kΩ
4.25V TO 15V
IN
CHG
ACOK
BATT
MAX8808X
(MAX8808Y)
MAX8808Z
C1
1µF
AC-INPUT
PRESENT
INDICATOR
ENABLE
INPUT
EN (EN)
C2
1µF
4.2V
Li+
Microprocessor-Interfaced Charger
Figure 4 shows the MAX8808X as a µP co-operated Li+
battery charger. The MAX8808X begins charging the bat-
tery when EN is low. The µP can drive EN high to disable
the charger. The MAX8808X generates a ACOK signal to
indicate the presence of an input supply. CHG is used to
detect the charge status of the battery. By monitoring
ISET
VL
C3
0.47µF
R1
2.8kΩ
GND
V , the system can measure the charging current.
ISET
Figure 3. Stand-Alone Li+ Battery Charger
AC/DC
ADAPTER
IN
BATT
C2
1µF
4.2V
Li+
C1
1µF
V
I/O
MAX8808XETA
CHG
VL
GND
R3
100kΩ
SYSTEM
ACOK
C3
0.47µF
ISET
EN
R1
2.8kΩ
R2
10kΩ
CHARGE-CURRENT MONITOR
V
I/O
C4
0.1µF
R4
100kΩ
LOW: CHARGE, HIGH: FULL OR OFF
Figure 4. µP-Interfaced Li+ Battery Charger
_______________________________________________________________________________________
9
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
USB-Powered Li+ Charger
The universal serial bus (USB) provides a high-speed
serial communication port as well as power for the
remote device. The MAX8808X/MAX8808Y/MAX8808Z
can be configured to charge a battery at the highest
current possible from the host port. Figure 5 shows the
MAX8808X as a USB battery charger. To make the cir-
cuit compatible with either 100mA or 500mA USB ports,
the circuit initializes at 100mA charging current. The µP
then enumerates the host to determine its current capa-
bility. If the host port is capable, the charging current is
increased to 425mA to avoid exceeding the 500mA
USB specification.
Layout and Bypassing
Place the input capacitor as close to the device as pos-
sible. Provide a large copper ground plane to allow the
exposed paddle to sink heat away from the device.
Connect the battery to BATT as close to the device as
possible to provide accurate battery voltage sensing.
Make all high-current traces short and wide to minimize
voltage drops. A sample layout is available in the
MAX8808 evaluation kit to speed designs.
VBUS
GND
IN
BATT
C2
1µF
4.2V
Li+
C1
1µF
V
I/O
MAX8808XETA
CHG
VL
GND
R3
100kΩ
SYSTEM
ACOK
C3
0.47µF
USB PORT
ISET
EN
R2
13kΩ
R1
4kΩ
HIGH: 425mA, LOW: 100mA
N
V
I/O
R4
100kΩ
D+
D-
Figure 5. USB Battery Charger
10 ______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Pin Configuration
Chip Information
PROCESS: BiCMOS
TOP VIEW
8
7
6
5
4
MAX8808
1
2
3
TDFN
( ) INDICATES THE MAX8808Y.
______________________________________________________________________________________ 11
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
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.)
PACKAGE OUTLINE
8L TDFN EXPOSED PAD, 2x2x0.80mm
1
21-0168
A
2
12 ______________________________________________________________________________________
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
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.)
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
1.90
1.90
0.00
0.20
MAX.
0.80
2.10
2.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
DOWNBONDS
ALLOWED
PKG. CODE
T822-1
N
8
D2
E2
e
JEDEC SPEC
MO229
b
[(N/2)-1] x e
1.50 REF
0.70±0.10
1.30±0.10
0.50 TYP.
0.25±0.05
NO
PACKAGE OUTLINE
8L TDFN EXPOSED PAD, 2x2x0.80mm
2
21-0168
A
2
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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