ACT2801/ACT2801C
Rev 2, 15-Apr-14
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
Boost/high-Z mode enable pin, internally pulled up by a 3MΩ resistor to battery. When
HZ pin is pulled ground, boost is enabled if VIN is not present.
1
HZ
Push button input, connect a push button from this pin to AGND, internally pulled up
by a 3MΩ resistor to battery. PB starts up boost converter if HZ pin is grounded and
VIN is not present. When this pin is pushed for 100ms, LED1-4 indicators are enable
2
PB
for 5 seconds. For ACT2801C, if this pin is pushed for 3s, Flashlight is enabled.
3
4
AGND
nPG
Logic Ground.
Drive external P-FET to protect output short circuit and leakage during shutdown. nPG
pin is pulled up to VOUT internally. nPG pin is pulled low if VOUT is in the range.
Input current limit setting pin. Connect a resistor from this pin to AGND to set the input
current limit. The current setting ranges from 0.5A-2.0A.
5
6
ILIM
VIN
USB or AC adaptor input. When VIN is valid, charge and power path is enabled.
Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor
placed as close to the IC as possible.
7, 8
9, 10
11
VOUT
SW
Internal switch to output inductor terminal.
Power ground. PGND is connected to the source of low-side N-channel MOSFET and
the MOSFET’s gate driver.
PGND
Battery input. Connected to the battery pack positive terminal to provide power in High-
Z mode. Bypass to PGND with a high quality ceramic capacitor placed as close to the
IC as possible.
12
BAT
Positive terminal of charge current sense input. Kevin sense is required with 10nF
ceramic capacitor right across CSP and CSN pins.
13
14
15
CSP
CSN
IOST
Negative terminal of charge current sense input.
Output current setting. Connect a resistor from this pin to AGND to set output constant
current. The current setting ranges from 0.5A-1.5A.
Fast charge current setting pin. Connect a resistor from this pin to AGND to set the
charge current. The current setting ranges from 0.5A-1.5A.
16
17
ICST
BTV
Battery termination voltage setting. Connect a resistor from this pin to AGND to
program battery charge termination voltage.
18
19
20
21
LED1
LED2
LED3
LED4
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery impendence compensation input. Connect to a resistor from this pin to APNG
to program the battery impedance.
22
23
RIMC
BLVS
Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery
LED indication thresholds.
TH: ACT2801
Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K
pulled down resistor.
24
TH/FLD
EP
FLD: ACT2801C
Open-drain Flashlight driver. A internal switch can handle up to 50mA.
25
Exposed pad. Must be soldered to ground on the PCB.
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