Rev 9, 14-Mar-17

- 3 -

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ACT2801/ACT2801B/ACT2801C

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

HZ

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.

2

PB

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. For ACT2801B/ACT2801C, if this pin is pushed for 3s, flashlight is

enabled.

3

AGND

Logic Ground. AGND must be connected to PGND externally through ground plane.

4

nPG

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.

5

ILIM

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.

6

VIN

USB or AC adaptor input. When VIN is valid, charge and power path is enabled.

7, 8

VOUT

Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor

placed as close to the IC as possible.

9, 10

SW

Internal switch to output inductor terminal.

11

PGND

Power ground. PGND is connected to the source of low-side N-channel MOSFET and

the MOSFET’s gate driver. PGND must be connected to AGND externally through

ground plane.

12

BAT

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.

13

CSP

Positive terminal of charge current sense input. Kevin sense is required with 10nF

ceramic capacitor right across CSP and CSN pins.

14

CSN

Negative terminal of charge current sense input.

15

IOST

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.

16

ICST

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.

17

BTV

Battery termination voltage setting. Connect a resistor from this pin to AGND to

program battery charge termination voltage.

18

LED1

Battery level indicator. An internal 3.5mA sink current limit is built in.

19

LED2

Battery level indicator. An internal 3.5mA sink current limit is built in.

20

LED3

Battery level indicator. An internal 3.5mA sink current limit is built in.

21

LED4

Battery level indicator. An internal 3.5mA sink current limit is built in.

22

RIMC

Battery impendence compensation input. Connect to a resistor from this pin to APNG

to program the battery impedance.

23

BLVS

Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery

LED indication thresholds.

24

TH/FLD

TH: ACT2801

Temperature sensing input. Connect to battery thermistor terminal. If not use, put 10K

pull down resistor to AGND.

FLD: ACT2801B/ACT2801C

Open-drain flashlight driver. A internal switch can handle up to 50mA.

25

EP

Exposed pad. Must be soldered to ground on the PCB.