AAT3685 Datasheet, PDF (2/23 Pages) Advanced Analogic Technologies – Lithium-Ion/Polymer Battery Charger

AAT3685
Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
1
2
3
4
Name
ADP/USB
BAT
GND
CHR
Type
In
In/Out
Ground
In/Out
5
EN
In
6
TS
In/Out
7
DATA
In/Out
8
STAT2
Out
9
STAT1
Out
10
PWRSEL
In
11
SETL
In/Out
12
SETH
In/Out
EP
Function
Line adapter or USB power supply input.
Battery charging and sensing.
Ground connection.
Resistor divider to set USB voltage regulation for charge reduction mode.
Leave this pin open for default 4.5V USB regulation point. Tie to ADP/USB
pin to disable this function.
Enable pin. Logic high enables the IC.
Connect to 10kΩ NTC thermistor.
Status report to microcontroller via serial interface, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
When ADP/USB is present, use this pin to toggle between SETH and SETL
charging levels.
Connect resistor here to set charge current for low-current port.
Connect resistor here to set charge current for high-current port.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TDFN33-12
(Top View)
ADP/USB ¹
BAT ²
GND ³
CHR ⁴
EN ⁵
TS ⁶
12 _SETH
11 _SETL
10 _PWRSEL
9 _STAT1
8 _STAT2
7 _DATA
2
3685.2006.10.1.3