Preliminary Datasheet

LP28055

LP28055 – 02

Oct.-2018

www.lowpowersemi.com

Page 1 of 7

1A Single-chip Li-ion and Li-POL Charger

General Description

The LP28055 is a complete constant-current/ constant voltage

linear charger for single cell lithium-ion batteries. Its ESOP8

package and low external component count make the LP28055

ideally suited for portable applications. No external sense

resistor is needed, and no blocking diode is required due to the

internal MOSFET architecture. Thermal feedback regulates the

charge current to limit the die temperature during high power

operation or high ambient temperature. The charge voltage is

fixed at 4.2V, and the charge current can be ISET rammed

externally with a single resistor.

The LP28055 automatically terminates the charge cycle when

the charge current drops to 1/10 setting current value after the

final float voltage is reached.

When the input supply is removed, the LP28055 automatically

enters a low current state, dropping the battery drain current to

less than < 1µA.

Other features include charge current monitor, under voltage

lockout, automatic recharge and a status pin to indicate charge

termination and the presence of an input voltage.

Order Information

LP28055 □ □ □ □

F: Pb-Free

Package Type

SP: ESOP8

Charge Voltage

Default：4.2V

Applications



Portable Media Players/Game



Power Bank



PDA/MID



Bluetooth Applications

Features



input voltage up to 28V



input Over Voltage Protection：7V



Short-circuit protection



Programmable Charge Current Up to 1000mA



< 1µA Battery Reverse Current



Protection of Reverse Connection of Battery



No MOSFET, Sense Resistor or Blocking Diode Required



Constant-Current/Constant-Voltage Operation with

Thermal Regulation to Maximize Charge Rate Without

Risk of Overheating



Programmable Charge TerminationAC Adapter Power

Good Indicator



ESOP8 Package



RoHS Compliant and 100% Lead (Pb)-Free

Typical Application Circuit

STAT2

GND

NTC

STAT1

LP28055

Battery

VIN

1K

LED1

LED2

BAT

NC

10uF

ISET

RISET

1uF

VIN

4

1

2

5

7

6

3

8

10nF

Marking Information

Device

Marking Package

Shipping

LP28055SPF

LPS

LP28055

YWX

ESOP8

2.5K/REEL

Marking indication:

Y:Production year W:Production week X: Series Number