LP4054

Aug.-2017

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www.lowpowersemi.com

Page 2 of 7

Preliminary Datasheet

LP4054

Functional Pin Description

Package Type

Pin Configurations

SOT23-5

VIN

GND

STAT

BAT

ISET

1

2

3

4

5

Top View

Pin

Name

Description

1

CHRG

Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled

low by an internal N-channel MOSFET. When the LP4054 detects an under voltage lockout

condition or charge complete, CHRG is forced high impedance.

2

GND

Ground.

3

BAT

Charge Current Output. Provides charge current to the battery and regulates the final float

voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage .

4

VIN

Positive Input Supply Voltage.

5

ISET

Charge Current Program and Charge Current Monitor Pin. The charge current is

programmed by connecting a 1% resistor, RISET, to ground. When charging in

constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be

used to measure the charge current using the following formula: IBAT=1000/RISET