LP4059-00

Jan.-2018

www.lowpowersemi.com

Page 2 of 9

Preliminary Datasheet

LP4059

Typical Application Circuit

VCC

CHRG

GND

BAT

SLP

PROG

VIN

BAT

1MΩ

1uF

1uF

2KΩ

Battery

LED

Functional Pin Description

Package Type

SOT23-6

DFN-6

Pin Configurations

1

2

3

6

5

4

CHRG

GND

BAT

PROG

SLP

VCC

SOT23-6

(Top View)

6

5

4

1

2

3

7

(PAD)

CHRG

SLP

TDFN-6

(Top View)

BAT

PROG

GND

VCC

Pin Description

Pin

Name

Description

SOT23-6

DFN-6

6

1

PROG

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

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

2

2

GND

Ground.

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 of the

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.

5

5

SLP

Connect to the I/O port of the MCU and connect a 1Mohm resistor to the BAT pin.

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 LP4059 detects an under voltage lockout condition or

charge complete, CHRG is forced high impedance.