UB2017

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 13

www.unisonic.com.tw

QW-R502-868.a

MARKING INFORMATION

PACKAGE

VOLTAGE CODE (Note)

MARKING

SOT-25

AA: 4.2V

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

CHRG

Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is

pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a

weak pull-down of approximately 20uA is connected to the CHRG pin, indicating an “AC

present” condition.

2

GND

Ground.

3

BAT

Charge Current Output. Provides charge current to the battery and regulates the final

float voltage to 4.2V.

4

4.25V to 6.5V and should be bypassed with at least a 1μF capacitor.

5

CHRGT

Open-Drain Charge Termination Status Output. When the battery is charging, the

CHRGT pin is pulled high by an external component such as an LED. After the charging

is completed, this pin is pulled low by internal N-channel MOSFET and it can be used

as a charging termination indicator.

6

PROG

Charge Current Program, Charge Current Monitor and Shutdown Pin.