ACT2803
Rev 1, May-12-2016
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
CSN
Output current sense negative input.
Output current sense positive input.
Power Output Pin.
2,3
4, 5
6, 7
CSP
VOUT
VIN
USB or AC Adapter input.
8
9
OVGATE Output to drive optional external NMOS protect IC from over voltage.
OVSENS USB or AC Adapter input sense.
10
11
SCL
SDA
I2C clock input.
I2C data input.
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.
12
PGND
13
HSB
SW
High side bias pin. Connect a 47nF ceramic capacitor from HSB to SW.
Internal switch connected to a terminal of the output inductor.
14,15
16,17
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.
BAT
Battery charge current sense input. Connect to charge sense resistor positive terminal with
Kevin sense.
18
BATS
19
20
21
22
BATP
BATC
CBD
Connect to charge sense resistor negative terminal and battery positive terminal.
Battery central point connection. Connect to dual battery cell common terminal.
Cell balancing discharge. Connect to a discharge resistor from this pin to battery common
terminal.
BATN
Battery negative terminal.
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.
23
24
25
ICST
TH
Temperature sensing input. Connect to a battery thermistor terminal.
+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.
VREG
26
27
AGND
PB
Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC.
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.
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