Pin Configura�ons

Figure 2 Pin Configura�on of FC9054(Top View)

Pin Descrip�on

Pin Name

Pin Number

CHRG

1

When the ba�ery is being charged, the CHRG pin is pulled low by an internal switch,

otherwise CHRG pin is in high impedance state.

GND

2

GND

BAT

3

Connect the posi�ve terminal of the ba�ery to BAT pin. BAT pin draws less than 2uA

current in chip disable mode or in sleep mode. BAT pin provides charge current to the

ba�ery and provides regula�on voltage of 4.2V.

Vcc

4

VIN is the power supply to the internal circuit. When VIN drops to within 30mv of the

BAT pin voltage, FC9054 enters low power sleep mode, dropping BAT pin’s current to

less than 2uA

PROG

5

precharge mode, the PROG pin’s voltage is regulated to 0.1V. When in constant charge

current mode, the PROG pin’s voltage is regulated to 1V. In all modes during charging,

the voltage on PROG pin can be used to measure the charge current as follows:

Ordering Informa�on

FC9054

Circuit Type

Packing:

Blank

：Tube

R: Tape and Reel

T : SOT-23-5

CHRG 1

GND 2

BAT 3

5 PROG

4 VCC

FC9054

2019. 05. 13

2/8

Revision No : 0