MAX8804V [MAXIM]
High-Voltage, Dual-Input, USB/AC Adapter Chargers in 2mm x 3mm TDFN;
| 型号： | MAX8804V |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High-Voltage, Dual-Input, USB/AC Adapter Chargers in 2mm x 3mm TDFN |
| 文件： | 总16页 (文件大小：199K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0785; Rev 2; 4/08
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
General Description
Features
♦ Complete Chargers for Single-Cell Li+ Battery
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
intelligent, dual-input, stand-alone, constant-current,
constant-voltage (CCCV), thermally regulated linear
chargers are designed for a single-cell lithium-ion (Li+)
battery. They integrate the current-sense circuit, MOS
pass element, thermal-regulation circuitry, and overvolt-
age protection (OVP), and eliminate the reverse-block-
ing Schottky diode.
♦ Dual-Input, 30V AC Adapter/16V USB
♦ No External FET, Blocking Diode, or Sense
Resistor Required
♦ Automatic USB/AC Adapter Input Selection
♦ Easy Programmable Fast-Charge Current and
Top-Off Threshold
♦ Proprietary Die Temperature Regulation Control
♦ ±±5 Fast-Charge Current-Limit Accuracy
The MAX8804V/MAX8804W/MAX8804Z function as
stand-alone chargers to control the charging sequence
from the prequalification state through fast-charge, top-
off charge, and full-charge indication. The MAX8804Y
eliminates the prequalification state to allow startup into a
load without a battery. Proprietary thermal-regulation cir-
cuitry limits the die temperature when fast-charging or
while exposed to high ambient temperatures, allowing
maximum charging current without damaging the IC.
♦ Battery Pack Detection Input
(MAX8804V/MAX8804W)
♦ Power-Present and Charger-Status Outputs
♦ No Prequalification Charge (MAX8804Y)
♦ Tiny 2mm x 3mm Thermally Enhanced TDFN
Package
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
achieve high flexibility by providing an adjustable DC/USB
fast-charge current through a simple single-wire interface
(SET input). The chargers automatically select between
either a USB or AC adapter input source. The AC adapter
charge current is programmable from 400mA to 700mA in
50mA steps through a serial interface. The USB charge
current is programmable to 95mA, 380mA, or 475mA
through the same interface. Other features include an
active-low battery charging-status indicator (CHG), an
active-low power-OK indicator (POK), an active-low USB
input detection output (USBPWR) on the MAX8804Y/
MAX8804Z, and battery pack detection (DETBAT) on the
MAX8804V/MAX8804W.
Ordering Information
PIN-
TOP
PART
PACKAGE
MARK
MAX8804VETA+
MAX8804WETA+
MAX8804YETA+
MAX8804ZETA+
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
AAQ
AAP
AAD
AAC
*EP = Exposed paddle.
+Denotes a lead-free package.
Note: All devices are specified to operate over the -40°C to
+85°C operating temperature range.
The MAX8804V has 120mA, 140mA, 180mA, and
200mA CHG top-off threshold settings, while the
MAX8804W/MAX8804Y/MAX8804Z have 70mA, 80mA,
90mA, and 100mA.
Typical Application Circuit
+3.3V
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
accept a 4.15V to 30V DC source voltage or a 4.15V to
16V USB input voltage, but disable charging when
either input voltage exceeds 7.5V to protect against
unqualified or faulty input sources. The MAX8804V/
MAX8804W/MAX8804Y/MAX8804Z operate over the
extended temperature range (-40°C to +85°C) and are
available in a tiny 8-pin thermally enhanced 2mm x
3mm TDFN package.
AC
ADAPTER
DC
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
CHG
POK
1μF
1μF
GND
USB
USB
PORT
<USBPWR>
(DETBAT)
Applications
BAT
ENABLE/DISABLE
Cell Phones/Smartphones MP3 Players
Li+
2.2μF
AND PROGRAMMING
SET
Digital Cameras
Other Handheld Devices
NOTE: () FOR MAX8804V/MAX8804W, < > FOR MAX8804Y/MAX8804Z
Portable Media Players
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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.
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
DC to GND .............................................................-0.3V to +30V
USB to GND ...........................................................-0.3V to +16V
BAT, CHG, SET, POK, USBPWR, DETBAT
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
to GND...............................................................-0.3V to +5.5V
Continuous Power Dissipation (T = +70°C)
A
8-Pin TDFN 2mm x 3mm (derate 16.7mW/°C above +70°C)
(multilayer board).......................................................1333mW
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
= 0V) or (V
= 5V, V
= 5V), V
= unconnected, V = 0V (MAX8804V/MAX8804W), T = -40°C to
DETBAT A
DC
SET
USB
SET
BAT
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
DC AND USB
CONDITIONS
MIN
TYP
MAX
UNITS
DC Input Voltage Range
USB Input Voltage Range
0
28
14
V
V
V
V
V
0
Input Operating Range
(Notes 2, 3)
4.15
3.85
7.2
7.00
4.15
7.8
Input Undervoltage Threshold
Input Overvoltage Threshold
V
V
V
V
V
V
V
V
V
V
V
V
rising, 500mV hysteresis (typ) (Note 2)
rising, 200mV hysteresis (typ) (Note 2)
4.0
7.5
IN
IN
= 0V, I
= 0mA, charge mode
800
300
300
800
300
300
0.55
0.65
260
55
1200
550
550
1200
550
550
1.0
USB
SET
BAT
DC Input Supply Current
USB Input Supply Current
= 5V, standby mode
= 4.3V, shutdown mode
µA
µA
= V
DC
BAT
= 0V, V
= 5V, I
= 0mA, charge mode
DC
SET
BAT
= 0V, standby mode
SET
USB
= V
= 4.3V, shutdown mode
BAT
DC to BAT On-Resistance
USB to BAT On-Resistance
= 3.7V, V
= 3.6V
Ω
Ω
DC
BAT
= 3.7V, V
= 3.6V
1.2
USB
BAT
rising
145
385
IN
IN
Input to BAT Comparator
Threshold (Note 2)
mV
falling
BAT
T
T
= +25°C
4.179
4.158
4.40
4.200
4.200
4.67
0.1
4.221
4.242
4.90
A
BAT Regulation Voltage
I
= 0mA
rising
V
V
BAT
= -40°C to +85°C
A
V
BAT
Battery Removal Detection
Threshold
Hysteresis
Default and 1st to 3rd
interface pulse
475
500
525
VWY/MAX804Z
V
V
= 0V,
= 3.6V,
USB
BAT
4th to 7th interface pulse
8th to 11th interface pulse
12th to 15th interface pulse
16th to 19th interface pulse
20th to 23rd interface pulse
24th to 27th interface pulse
523
570
428
380
618
665
550
600
450
400
650
700
578
630
473
420
683
735
DC Charging Current
rising edge detection on
SET (MAX8804Y/
MAX8804Z)
mA
2
_______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
ELECTRICAL CHARACTERISTICS (continued)
((V
= 5V, V
= 0V) or (V
= 5V, V
= 5V), V
= unconnected, V
= 0V (MAX8804V/MAX8804W), T = -40°C to
DETBAT A
DC
SET
USB
SET
BAT
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Default and 1st to 3rd interface
pulse
428
450
473
V
V
= 0V,
= 3.6V,
USB
BAT
4th to 7th interface pulse
8th to 11th interface pulse
12th to 15th interface pulse
16th to 19th interface pulse
20th to 23th interface pulse
24th to 27th interface pulse
523
475
380
570
618
665
550
500
400
600
650
700
578
525
420
630
683
735
DC Charging Current
rising edge detection
on SET (MAX8804V/
MAX8804W)
mA
V
V
= 0V,
DC
Default
90
360
450
360
450
90
95
100
400
500
400
500
100
= 3.6V, rising
BAT
1st interface pulse
2nd interface pulse
Default
380
475
380
475
edge detection on SET
(MAX8804Y/
MAX8804Z)
USB Charging Current
mA
V
V
= 0V,
DC
= 3.6V, rising
BAT
1st interface pulse
2nd interface pulse
edge detection on SET
(MAX8804V/
MAX8804W)
95
Soft-Start Time
Ramping time from 0 to 500mA
250
µs
V
MAX8804V/MAX8804W/MAX8804Z only, V
300mV hysteresis (typ)
rising,
BAT
BAT Prequal Threshold
2.35
2.50
95
2.65
BAT Prequal Charge Current
BAT Leakage Current
SET
MAX8804V/MAX8804W/MAX8804Z only
mA
µA
V
= V
= 0V, V = 4.2V
BAT
2
DC
USB
V
V
rising
falling
1.6
SET
SET
Logic Input Thresholds
V
0.4
1
Logic-High Time
Pulse width required to program DC charge current
Pulse width required to program USB charge current
1000
1000
2.5
µs
µs
Logic-Low Time
1
SET DC Mode Shutdown Delay
SET USB Mode Shutdown Delay
SET Internal Pulldown Resistor
V
V
= 0V, V
= 5V, measured from V
low to high
high to low
1.5
1.5
2
2
2
ms
ms
MΩ
USB
DC
SET
SET
= 0V, V
= 5V, measured from V
2.5
DC
USB
4
POK, CHG, USBPWR (USBPWR only for MAX8804Y/MAX8804Z)
Logic Output-Voltage Low
I
= I
= I = 5mA
USBPWR
60
500
1
mV
µA
POK
CHG
V
V
V
= V
POK
USBPWR
=
CHG
T
T
= +25°C
= +85°C
0.001
A
A
Logic Output-Current High
= 5.5V,
= 0V
USB
0.01
= V
DC
DETBAT (MAX8804V/MAX8804W only)
Rising
Logic Input Theshold
Falling
1.6
V
0.4
Pullup Resistor
63
kΩ
_______________________________________________________________________________________
3
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
((V
= 5V, V
= 0V) or (V
= 5V, V
= 5V), V
= unconnected, V
= 0V (MAX8804V/MAX8804W), T = -40°C to
DETBAT A
DC
SET
USB
SET
BAT
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CHG
V
= 0V, V
= 5V
USB
60
80
100
DC
Default, 4th, 8th,
12th, 16th, 20th,
24th, 28th interface
pulse
60
80
100
1st, 5th, 9th, 13th,
17th, 21st, 25th
interface pulse
CHG Top-Off Threshold
(MAX8804W/MAX8804Y/
MAX8804Z)
I
falling, battery is
BAT
67.5
75
90
112.5
125
charged, rising edge
on SET
mA
V
V
= 5V,
DC
= 0V
USB
2nd, 6th, 10th,
14th, 18th, 22nd,
26th interface pulse
100
3rd, 7th, 11th, 15th,
19th, 23rd, 27th
interface pulse
52.7
60
70
80
87.5
100
V
= 0V, V
= 5V
USB
DC
Default, 4th, 8th,
12th, 16th, 20th,
24th, 28th interface
pulse
90
120
150
1st, 5th, 9th, 13th,
17th, 21st, 25th
interface pulse
I
falling, battery is
BAT
105
135
150
140
180
200
175
225
250
CHG Top-Off Threshold
(MAX8804V)
charged, rising edge
on SET
mA
V
V
= 5V,
DC
= 0V
USB
2nd, 6th, 10th,
14th, 18th, 22nd,
26th interface pulse
3rd, 7th, 11th, 15th,
19th, 23rd, 27th
interface pulse
DC mode
57
51
4
I
rising after top-off
BAT
CHG Hysteresis
mA
ms
is detected (Note 4)
USB mode
CHG Detection Delay
I
falls below top-off threshold
3
5
BAT
THERMAL LOOP
Junction temperature when the charge current is reduced,
T rising
J
Thermal-Regulation Set Point
Thermal-Regulation Gain
+105
°C
VWY/MAX804Z
DC charging
USB charging
-40
-24
Reduction of I
for
BAT
mA/°C
increase of T
J
Note 1: Devices are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by design
A
and characterization.
Note 2: V refers to the input for the IC. For the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z, V is V
with V = 0V or V
USB USB
IN
IN
DC
with V
= 0V.
DC
Note 3: Guaranteed by undervoltage and overvoltage threshold testing. For charge completion, the input voltage must be greater
than 4.28V.
Note 4: This hysteresis is for all charge current except 95mA. In the case of 95mA charge current, voltage-mode to current-mode
detection gives indication of charge mode.
4
_______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
Typical Operating Characteristics
(V
BAT
= 3.6V; DC charge mode: V
= 5V, V
= 0V, V
= 0V (MAX8804Y/MAX8804Z only), V
= 0V or unconnected; USB
DC
USB
DETBAT
SET
charge mode: V
= 5V, V
= 0V, V
= 5V; T = +25°C, unless otherwise noted.)
SET A
USB
DC
SUPPLY CURRENT vs. INPUT VOLTAGE
(DC CHARGING MODE)
SUPPLY CURRENT vs. INPUT VOLTAGE
(USB CHARGING MODE)
1.0
0.8
0.6
0.4
0.2
0
1.0
0.8
0.6
0.4
0.2
0
0
3
6
9
12 15 18 21 24 27 30
0
2
4
6
8
10 12 14 16
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
STANDBY-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE (USB CHARGING MODE)
DISABLED-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE (DC CHARGING MODE)
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10 12 14 16
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
CHARGE CURRENT vs. BATTERY VOLTAGE
(USB CHARGING MODE)
CHARGE CURRENT vs. BATTERY VOLTAGE
(DC CHARGING MODE)
600
500
400
300
200
100
0
200
160
120
80
40
0
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)
_______________________________________________________________________________________
5
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Typical Operating Characteristics (continued)
(V
BAT
= 3.6V; DC charge mode: V
= 5V, V
= 0V, V
= 0V (MAX8804Y/MAX8804Z only), V
= 0V or unconnected; USB
DC
USB
DETBAT
SET
charge mode: V
= 5V, V
= 0V, V
= 5V; T = +25°C, unless otherwise noted.)
USB
DC
SET
A
CHARGE CURRENT
vs. DC INPUT VOLTAGE
CHARGE CURRENT
vs. USB INPUT VOLTAGE
120
CHARGE CURRENT vs. SET PULSE
(USB CHARGING MODE) (MAX8804Y/MAX8804Z)
MAX8804Y/Z toc09
600
500
400
300
200
100
0
V
SET
90
60
30
0
1V/div
475mA
475mA
475mA
380mA
380mA
I
200mA/div
CHG
95mA
95mA
95mA
0
5
10
15
20
25
30
0
2
4
6
8
10 12 14 16
2ms/div
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
CHARGE CURRENT vs. SET PULSE
(DC CHARGING MODE) (MAX8804Y/MAX8804Z)
BATTERY REGULATION VOLTAGE
vs. AMBIENT TEMPERATURE
MAX8804Y/Z toc10
600
500
400
300
200
100
0
4.210
4.204
4.198
4.192
4.186
4.180
INPUT VOLTAGE DECREASING
USB MODE
V
SET
1V/div
DC MODE
700mA
700mA
650mA
600mA
DC MODE
200mA/div
I
CHG
550mA
500mA
USB MODE
450mA
400mA
500mA
2ms/div
0
100
200
300
400
500
-40
-15
10
35
60
85
INPUT VOLTAGE HEADROOM (mV)
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
BATTERY REGULATION VOLTAGE
vs. LOAD CURRENT
700
4.30
4.25
4.20
4.15
600
500
400
300
200
VWY/MAX804Z
DC CHARGE MODE 650mA
550mA CHARGE-CURRENT SETTING
4.10
0
-40
-15
10
35
60
85
100 200 300 400 500 600 700
LOAD CURRENT (mA)
AMBIENT TEMPERATURE (°C)
6
_______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
Pin Description
PIN
NAME
FUNCTION
MAX8804V/ MAX8804Y/
MAX8804W
MAX8804Z
Battery Connection. The IC delivers charging current and monitors battery voltage
using BAT. Bypass BAT to GND with a 2.2µF or larger ceramic capacitor. BAT is high
impedance when the IC is disabled.
1
1
BAT
Battery Pack Detection Input. Drive DETBAT low or connect it to GND to allow SET to
control the charger. Leave DETBAT unconnected to disable any charge mode.
2
—
2
DETBAT
USB Input Detection Output. USBPWR is internally pulled low if a valid voltage is
USBPWR present at USB, otherwise it is high impedance. USBPWR circuitry is active regardless
—
of SET and charger on/off status.
Power-OK Monitor. POK is an open-drain output that is internally pulled low when a
valid charging source is detected at either DC or USB. POK is high impedance when
both input voltages are less than V or V
3
3
POK
.
BAT
UVLO
DC Input Supply. Connect DC to a 4.15V to 7V charging source. Bypass DC to GND
with a 1µF or larger ceramic capacitor. DC takes priority over USB when both are valid.
4
5
6
4
5
6
DC
USB Input Source. Connect USB to a USB port. Bypass USB to GND with a 1µF or
larger ceramic capacitor.
USB
CHG
Charging-Status Output. CHG is internally pulled low when the battery is being
charged. CHG is high impedance when the charger is in top-off mode or disabled.
Enable/Disable, Charging Current, and Top-Off Threshold Set Input. Drive SET low to
enable DC charge mode and drive high to enable USB charge mode. If both DC and
USB inputs are present, SET is used for the DC charge mode only and USB charge is
disabled. SET is also used for programming the charge current and top-off threshold.
See the DC/USB Mode and Charging Current Setting section for details.
7
7
SET
8
8
GND
EP
Ground
—
—
Exposed Paddle. Connect to the GND plane for optimum thermal dissipation.
_______________________________________________________________________________________
7
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
4.15V TO 30V
DC
BAT
Li+
4.15V TO 16V
USB
+105°C
DC AND USB OUTPUT CONTROL
TEMP
SENSOR
VOLTAGE
LOOP
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
OVERVOLTAGE
PROTECTION
(DETBAT)
SET
DC
POK
CHG
POK
LOGIC
CONTROL
<USBPWR>
USB
POK
BIAS
CIRCUIT
REF
GND
NOTE: ( ) FOR MAX8804V/MAX8804W ONLY
< > FOR MAX8804Y/MAX8804Z ONLY
Figure 1. Functional Diagram
wire interface. As the battery voltage approaches 4.2V,
the charging current is reduced. If the battery current
drops below the top-off current threshold, the CHG indi-
cator goes high impedance, signaling that the battery is
fully charged. The ICs then enter a constant voltage-reg-
ulation mode to maintain the battery at full charge.
Detailed Description
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z dual-
input linear battery chargers use voltage, current, and
thermal-control loops to charge and protect a single Li+
battery. When a Li+ battery with a cell voltage below
2.5V is inserted, the MAX8804V/MAX8804W/MAX8804Z
chargers enter the prequalification stage where they
precharge that cell with 95mA (Figure 2). The CHG indi-
cator output is driven low to indicate entry into the pre-
qualification state. When battery voltage exceeds 2.5V,
the charger soft-starts as it enters the fast-charge stage.
The MAX8804Y eliminates the prequalification state and
enters fast-charge when the battery is inserted. The fast-
charge current level is programmed by a simple single-
VWY/MAX804Z
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z auto-
matically select between either a USB or AC adapter
input source. The AC adapter charge current is pro-
grammable from 400mA to 700mA in 50mA steps
through a simple single-wire interface (see Tables 2, 3,
and 4). The USB charge current is programmable to
95mA, 380mA, or 475mA through the same interface
(see Tables 5 and 6).
8
_______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
ASYNCHRONOUS
FROM ANYWHERE
= HIGH > 2ms
t
SET
FOR DC MODE
= LOW > 2ms
FOR USB MODE
STANDBY MODE
CHARGER = OFF
POK = LOW
CHG = HIGH IMPEDANCE
SHUTDOWN
CHARGER = OFF
POK = HIGH IMPEDANCE*
CHG = HIGH IMPEDANCE
V
< V < V
IN OVP
t
UVLO
SET
AND V > V
IN
BAT
ASYNCHRONOUS
FROM ANYWHERE
V
< V
IN
IN
UVLO
OVP
V
IN
< V
UVLO
OR V > V
t
= LOW > 2ms
SET
MAX8804V/
MAX8804W/
MAX8804Z
OR V > V
OR V > V
OR DETBAT = HIGH
FOR DC MODE
= HIGH > 2ms
IN
OVP
IN
BAT
IN
OR V > V
t
BAT
SET
OR DETBAT = HIGH
FOR USB MODE
PREQUALIFICATION
DEFAULT CHARGE CURRENT
MAX8804Y
= LOW > 2ms
POK = LOW
CHG = LOW
V
BAT
< 2.5V
t
SET
FOR DC MODE
= HIGH > 2ms
t
SET
FOR USB MODE
V
< 2.2V
BAT
MAX8804V/
MAX8804W/
MAX8804Z
V
> 2.5V
BAT
FAST-CHARGE
100% CHARGE CURRENT
POK = LOW
CHG = LOW
I
> I
+ 57mA FOR ALL
CHG TOP-OFF
I
< I
CHG TOP-OFF
FAST-CHARGE OPTIONS EXCEPT 95mA
CV MODE TO CC MODE FOR 95mA
FAST-CHARGE OPTION
FULL BAT
= 4.2V
V
BAT
POK = LOW
CHG = HIGH IMPEDANCE
*POK = LOW WHEN V > V
IN
OVP
Figure 2. Charger State Diagram
DC Charging
USB Charging
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z are
designed to charge a single-cell Li+ battery from a DC
source voltage between 4.15V and 7V and withstand
up to 30V maximum input voltage. The charge current
and top-off threshold are programmed with the SET
input.
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
contain a USB input that allows operation from a USB port
with voltages between 4.15V and 7V and can withstand
up to 16V maximum input voltage. Pulsing SET allows
programming a 95mA, 380mA, or 475mA maximum
charging current when using the USB input.
_______________________________________________________________________________________
9
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
DC/USB Mode and
Table 1. SET Truth Table
Charging Current Setting
SET is a logic input that sets DC/USB charging mode
and charging current. Drive SET low or leave it uncon-
nected to enable DC charging mode. Drive SET high to
enable USB charging mode (see Table 1). SET can
also be driven by series pulses to program the charg-
ing current in both DC and USB mode.
SET
V
V
CHARGER STATUS
DC
USB
0
Invalid
Invalid
Invalid Off
0
Valid
Off
DC charging mode enabled,
USB charging mode disabled
0
Valid
Invalid
DC charging mode enabled,
USB charging mode disabled
0
1
1
Valid
Invalid
Invalid
Valid
DC Charge Mode
Drive SET low or leave it unconnected to enable DC
charging mode. Subsequent pulses on SET program
the charging current and the top-off threshold. There
are seven fast-charge current options and four top-off
threshold options. Pulse SET high (1µs to 1ms pulse
width) subsequently to realize charging current and
top-off threshold programming and transition. After the
28th pulse, the MAX8804V/ MAX8804W/MAX8804Y/
MAX8804Z go into the default mode and start a new
cycle. See Tables 2, 3, and 4 and Figure 3 to set the
desired charging current and top-off threshold. Drive
SET high longer than 2ms to disable the DC charging-
control circuitry.
Invalid Off
DC charging mode disabled,
USB charging mode enabled
Invalid Off
Valid Off
Valid
1
1
Valid
Valid
Note: This table is true when DETBAT = LOW for the
MAX8804V/MAX8804W. When DETBAT = HIGH, the MAX8804W
enters shutdown.
Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT 1st
2nd
500
100
3rd
500
70
4th
550
80
5th
550
90
6th
550
100
7th
550
70
8th
600
80
9th
600
90
10th 11th 12th 13th 14th
I
(mA)
500
80
500
90
600
100
600
70
450
80
450
90
450
100
CHG
Top-Off Current
Threshold (mA)
PULSE
NUMBER
—
—
—
15th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 25th 26th 27th 28th
I
(mA)
450
70
400
80
400
90
400
100
400
70
650
80
650
90
650
100
650
70
700
80
700
90
700
100
700
70
500
80
CHG
Top-Off Current
Threshold (mA)
Table 3. MAX8804W DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT 1st
2nd
450
100
3rd
450
70
4th
550
80
5th
550
90
6th
550
100
7th
550
70
8th
500
80
9th
500
90
10th 11th 12th 13th 14th
VWY/MAX804Z
I
(mA)
450
80
450
90
500
100
500
70
400
80
400
90
400
100
CHG
Top-Off Current
Threshold (mA)
PULSE
NUMBER
—
—
—
15th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 25th 26th 27th 28th
I
(mA)
400
70
600
80
600
90
600
100
600
70
650
80
650
90
650
100
650
70
700
80
700
90
700
100
700
70
450
80
CHG
Top-Off Current
Threshold (mA)
10 ______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
Table 4. MAX8804V DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT 1st
2nd
450
180
3rd
450
200
4th
550
120
5th
550
140
6th
550
180
7th
550
200
8th
500
120
9th
500
140
10th 11th 12th 13th 14th
I
(mA)
450
120
450
140
500
180
500
200
400
120
400
140
400
180
CHG
Top-Off Current
Threshold (mA)
PULSE
NUMBER
—
—
—
15th 16th
17th 18th 19th 20th 21st 22nd 23rd 24th 25th 26th 27th 28th
I
(mA)
400
200
600
120
600
140
600
180
600
200
650
120
650
140
650
180
650
200
700
120
700
140
700
180
700
200
450
120
CHG
Top-Off Current
Threshold (mA)
DC
POK
2
3
4
24
25
26
27
28
1
> 2ms
SET
t
HIGH
700mA
(700mA)
2ms
DELAY
t
SOFTSTART
550mA
500mA
(450mA)
500mA
(450mA)
(550mA)
I
CHG
0mA
0mA
TOP-OFF
CURRENT
THRESHOLD
100mA
100mA
<180mA>
90mA
90mA
<140mA>
<180mA>
80mA
<120mA>
80mA
80mA
80mA
<120mA>
<140mA>
70mA
70mA
<120mA>
<120mA>
<200mA>
<200mA>
NOTE: ( ) FOR MAX8804V/MAX8804W
< >FOR MAX8804V
Figure 3. DC Charging Current and Top-Off Threshold Programming
______________________________________________________________________________________ 11
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
USB Charge Mode
Table 5. MAX8804Y/MAX8804Z USB
Drive SET high to enable USB charging mode when the
USB input is valid. Subsequent low pulses with 1µs to
1ms pulse width on SET program the fast charging cur-
rent from 95mA, 380mA, to 475mA for the MAX8804Y/
MAX8804Z and from 380mA, 475mA, to 95mA for the
MAX8804V/MAX8804W and then repeat new cycle as
shown in Tables 5 and 6. Drive SET low or leave it
unconnected longer than 2ms to disable USB charg-
ing-control circuitry.
Charging Current Programming by Series
Pulses
PULSE NUMBER
(mA)
DEFAULT
1st
2nd
3rd
I
95
380
475
95
CHG
Top-Off Current
Threshold (mA)
80
80
80
80
Table 6. MAX8804V/MAX8804W USB
Charging Current Programming by Series
Pulses
PULSE NUMBER
(mA)
DEFAULT
1st
2nd
3rd
I
380
475
95
380
CHG
Top-Off Current
Threshold (mA)
80
80
80
80
USB
POK
USBPWR
1
2
3
> 2ms
SET
t
LOW
2ms
DELAY
475mA
t
SOFTSTART
380mA
475mA
MAX8804Y/
MAX8804Z
95mA
95mA
380mA
I
0mA
CHG
0mA
VWY/MAX804Z
380mA
0mA
MAX8804V/MAX8804W
95mA
80mA
I
CHG
0mA
TOP-OFF
CURRENT
THRESHOLD
Figure 4. USB Charging Current Programming
12 ______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
Soft-Start
The soft-start circuitry activates when entering fast-
charge mode. In the MAX8804Y, soft-start is entered
directly after being enabled, and the charging current
ramps up in 250µs from 0 to 500mA (95mA in USB
mode). This reduces the inrush current on the input
supply. Note that the MAX8804V/MAX8804W/
MAX8804Z has a prequalification state and the charg-
ing current ramps up when the prequalification state is
USB Power Status Output (USBPWR)
(MAX8804Y/MAX8804Z Only)
USBPWR is internally pulled low when V
> V
UVLO
USB
and V
- V
> 250mV. Otherwise, it is high imped-
USB
BAT
ance. USBPWR indicates the USB input presence
regardless of SET status and charger status.
When the MAX8804Y/MAX8804Z are used in conjunction
with a µP, connect a pullup resistor between USBPWR
and the logic I/O voltage to indicate USB power status
to the µP. Alternatively, USBPWR can sink up to 5mA
for an LED USB power status indicator.
complete (V
exceeds 2.5V).
BAT
Thermal Regulation Control
The thermal-regulation loop limits the MAX8804V/
MAX8804W/MAX8804Y/MAX8804Z die temperature to
+105°C by reducing the charge current as necessary.
This feature not only protects the ICs from overheating,
but also allows a higher charge current at room temper-
ature without risking damage to the system.
Battery Pack Dectection Input
(DETBAT, MAX8804V/MAX8804W Only)
DETBAT is pulled up to an internal 3V supply through a
63kΩ resistor. Driving DETBAT low or connecting it to
GND allows SET to control the charger. When DETBAT
is left unconnected, the MAX8804V/MAX8804W enters
shutdown.
Charging-Status Output (CHG)
CHG is an open-drain output that indicates charger sta-
tus. CHG goes low during charge cycles where the
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z are in
prequalification or fast-charge mode. CHG goes high
impedance when the charge current reaches the top-
off threshold for more than 4ms, indicating charging is
done. The CHG status is latched after the top-off
threshold is reached. The latch is reset by toggling the
SET input, recycling input power, or increasing the
charging current to the top-off threshold plus 57mA
(typ).
Applications Information
Capacitor Selection
Connect a 2.2µF ceramic capacitor from BAT to GND for
proper stability. Connect a 1µF ceramic capacitor from
DC to GND. If using the USB input, bypass USB to GND
with a 1µF ceramic capacitor. Use a larger input bypass
capacitor for high charging currents to reduce supply
noise. All capacitors should be X5R dielectric or better.
Be aware that some capacitors have large voltage and
temperature coefficients and should be avoided.
When the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
are used in conjunction with a microprocessor (µP), con-
nect a pullup resistor between CHG and the logic I/O
voltage to indicate charge status to the µP. Alternatively,
CHG can sink up to 5mA for an LED charge indicator.
Thermal Considerations
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z are
available in a thermally enhanced TDFN package with
an exposed paddle. Connect the exposed paddle to a
large copper ground plane to provide a thermal contact
between the device and the PCB for increased power
dissipation. The exposed paddle transfers heat away
from the device, allowing the IC to charge the battery
with maximum current, while minimizing the die temper-
ature increase.
Power-OK Monitor (POK)
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z con-
tain an open-drain POK output that goes low when a
valid input source is detected at either DC or USB. A
valid input source is one whose voltage is greater than
4.15V and exceeds the battery voltage by 250mV. After a
valid input has been established, charging is sustained
with inputs as low as 3.5V as long as the input voltage
remains above the battery voltage by at least 40mV. POK
status is maintained regardless of SET status.
Input Sources
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
operate from well-regulated input sources. The operat-
ing input voltage range is 4.15V to 7V. The device sur-
vives DC input supply voltages up to 30V and USB
input source voltages up to 16V without damage to the
IC. If the input voltage is greater than 7.5V (typ), the IC
stops charging. An appropriate power supply must pro-
vide at least 4.2V plus the voltage drop across the
internal pass transistor when sourcing the desired max-
imum charging current:
When the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
are used in conjunction with a µP, connect a pullup resis-
tor between POK and the logic I/O voltage to indicate
power-OK to the µP. Alternatively, POK can sink up to
5mA for an LED power-OK indicator.
______________________________________________________________________________________ 13
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
V
> 4.2V + I
x R
ON
Microprocessor-Interfaced Li+ Charger
Figure 5 shows the MAX8804V/MAX8804W/MAX8804Y/
MAX8804Z as a µP-interfaced Li+ battery charger. The
µP drives SET to enable/disable DC/USB mode charg-
ing. CHG can be used to detect the charge status of a
battery.
IN(MIN)
CHARGE(MAX)
where R
is the input-to-BAT resistance (typically
ON
0.55Ω for DC or 0.65Ω for USB). Failure to meet this
requirement results in an incomplete charge or
increased charge time.
Application Circuits
Layout and Bypassing
Connect the input capacitors as close as possible to
the IC. Provide a large copper GND plane to allow the
exposed paddle to sink heat away from the IC. Connect
the battery to BAT as close as possible to the IC to pro-
vide accurate battery voltage sensing. Make all high-
current traces short and wide to minimize voltage
drops. A sample layout is available in the MAX8804Z
evaluation kit to speed designs.
Stand-Alone Li+ Charger
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z pro-
vide a complete Li+ charging solution. The Typical
Application Circuit shows the MAX8804V/MAX8804W/
MAX8804Y/MAX8804Z as a stand-alone Li+ battery
charger. The LED indicates when either fast-charge or
prequalification has begun. When the battery is fully
charged, the LED turns off.
SYSTEM I/O
MAX8804V
AC
ADAPTER
DC
CHG
MAX8804W
MAX8804Y
MAX8804Z
1μF
1μF
POK
USB PORT
USB
μP
<USBPWR>
(DETBAT)
BAT
SET
Li+
2.2μF
GND
NOTE: () FOR MAX8804V/MAX8804W
< > FOR MAX8804Y/MAX8804Z
Figure 5. Microprocessor-Interfaced Li+ Charger with the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
VWY/MAX804Z
14 ______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
VWY/MAX804Z
Pin Configuration
Chip Information
PROCESS: BiCMOS
TOP VIEW
GND SET CHG USB
8
7
6
5
Package Information
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
For the latest package outline information, go to
www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
+
8 TDFN-EP
T823+1
21-0174
1
2
3
4
DC
BAT USBPWR POK
(DETBAT)
TDFN
2mm × 3mm
() FOR MAX8804V/MAX8804W
______________________________________________________________________________________ 15
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
4/07
10/07
4/08
Initial release.
—
Added MAX8804W and Battery Pack Detection feature.
1–16
1–15
Added MAX8804V and updated DC Charge Mode section.
VWY/MAX804Z
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
Heaney
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Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, 2 X 3 MM, LEAD FREE, TDFN-8
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