Rev 2, Feb-04-2016

- 3 -

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Copyright © 2016 Active-Semi, Inc.

ACT2804

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

CSN2

Output current sense negative input for channel 2.

2

CSN1

Output current sense negative input for channel 1.

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 10uF or 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 BAT pin to

PGND pin with high quality ceramic capacitors on the same layer with IC.

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.