LP4055-03

Apr.-2017

www.lowpowersemi.com

Page 2 of 8

Preliminary Datasheet

LP4055

Typical Application Circuit

Functional Pin Description

Package Type

Pin Configurations

SOT23-6 / TDFN-6

1

2

3

5

4

VCC

PROG

CHRG

GND

BAT

PROG

FULL

VCC

CHRG

GND

BAT

1

2

3

4

5

6

7

GND

SOT23-5

TDFN-6

TOP VIEW

Pin Description

Pin

Name

Description

SOT23-5

TDFN-6

1

6

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 LP4055 detects an under voltage lockout

condition or charge complete, CHRG is forced high impedance.

2

5,7

GND

Ground.

3

4

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

3

VCC

Positive Input Supply Voltage. Provide power to the charger. VCC can range from 4.5V to

6.5V and should be bypassed with at least a 1µF capacitor. When VCC drops to within 30mV

5

1

PROG

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

pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge

-

2

FULL

Open-Drain Charge Complete Status Output. When the battery charge complete, the FULL

pin is pulled low by an internal N-channel MOSFET. When the LP4055 is charging, FULL is

forced high impedance.

10uF

BATTERY

GREEN

RED

10uF

CHRG

CHRG_OK

GND

PROG

VCC

BATT

LP4055QVF

VIN

2.7K