LP28057A – 00

Jan.-2019

www.lowpowersemi.com

Page 1 of 7

Preliminary Datasheet

LP28057A

General Description

The LP28057A 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

LP28057A ideally suited for portable applications. Furthermore,

the LP28057A is specifically designed to work within USB

power specifications. 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 programmed externally with a single

resistor. The LP28057A automatically terminates the charge

cycle when the charge current drops to 1C/10th the

programmed value after the final float voltage is reached. When

the input supply (wall adapter or USB supply) is removed, the

LP28057A automatically enters a low current state, dropping

the battery drain current to less than 1µA. Other features

include charge current monitor, automatic recharge and a

status pin to indicate charge termination and the presence of an

input voltage.

Order Information

LP28057A

F: Pb-Free

Package Type

SP: ESOP-8

Default:4.2V

Applications



Portable Media Players/MP3 players



Cellular and Smart mobile phone



PDA/DSC



Bluetooth Applications

Features



Protection of Reverse Connection of Battery



Programmable Charge Current Up to 1000mA



No MOSFET, Sense Resistor or Blocking Diode Required



Constant-Current/Constant-Voltage Operation with

Thermal Regulation to Maximize Charge Rate Without

Risk of Overheating



1µA Supply Current in Shutdown



Drainage Charge Current Thermal Regulation Status

Outputs for LED or System Interface



Indicates Charge and Full



Optional Battery Temperature Monitoring Before and

During Charge Automatic Sleep Mode for Low-Power



Consumption Available in ESOP-8 Package



RoHS Compliant and 100% Lead (Pb)-Free

Typical Application Circuit

ISET

STAT2

VBAT

STAT1

Battery

10uF

VIN

RSET

2K

VSS

10uF

VIN

EN

ON

OFF

Marking Information

Device

Marking

Package

Shipping

LP28057ASPF

LPS

LP28057A

YWX

ESOP-8

4K/REEL

Y: Y is year code. W: W is week code. X: X is series number.