Rev 1, May-12-2016

- 3 -

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ACT2803

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

CSN

Output current sense negative input.

2,3

CSP

Output current sense positive input.

4, 5

VOUT

Power Output Pin.

6, 7

VIN

USB or AC Adapter input.

8

OVGATE

Output to drive optional external NMOS protect IC from over voltage.

9

OVSENS

USB or AC Adapter input sense.

10

SCL

I2C clock input.

11

SDA

I2C data input.

12

PGND

Power ground. Directly connect this pin to IC thermal PAD and connect 22uF high quality

capacitors from BAT to PGND on the same layer with IC.

13

HSB

High side bias pin. Connect a 47nF ceramic capacitor from HSB to SW.

14,15

SW

Internal switch connected to a terminal of the output inductor.

16,17

BAT

BAT connection. Connect it to battery current sense positive terminal. Bypass to PGND with high

quality ceramic capacitors placed as close to the IC as possible.

18

BATS

Battery charge current sense input. Connect to charge sense resistor positive terminal with

Kevin sense.

19

BATP

Connect to charge sense resistor negative terminal and battery positive terminal.

20

BATC

Battery central point connection. Connect to dual battery cell common terminal.

21

CBD

Cell balancing discharge. Connect to a discharge resistor from this pin to battery common

terminal.

22

BATN

Battery negative terminal.

23

ICST

Fast charge current setting pin. Connect a resistor from this pin to AGND to set the charging

current. The current setting ranges from 0.5A-1.8A. The voltage at this pin reflects the charge

current and discharge current in charge mode and discharge mode, respectively.

24

TH

Temperature sensing input. Connect to a battery thermistor terminal.

25

VREG

+

5V Bias output. Connect a 1.0uF to this pin. This pin supplies up to 50mA output current. The

bias turns on in charge mode and discharge mode. Internal register bit can shut down the bias.

Bias turns off in HZ mode.

26

AGND

Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC.

27

PB

Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled

for 5 seconds.

28

LED1

Battery level indicator.