Preliminary Datasheet

LP28056

LP28056 – 01 Ver. 1.1 Datasheet

FEB.-2012

www.lowpowersemi.com

Page 1 of 9

1.2A Single-chip Li-ion and Li-POL Charge with OVP

General Description

The LP28056 is a complete constant-current/ constant-

voltage linear charger for single cell lithium-ion batteries.

Its TDFN-10 package and low external component count

make the LP28056 ideally suited for portable applications.

Furthermore, the LP28056 is specifically designed to work

within USB power specifications. Its have a over voltage

protection in input with 6.5V and support over zero

voltages of battery can charge enable.

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 LP28056 automatically terminates the

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

ISET rammed value after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is

removed, the LP28056 automatically enters a low current

state, dropping the battery drain current to less than 2µA.

The LP28056 can be put into shutdown mode, reducing the

supply current to 25µA.

Other features include charge current monitor, undervoltage

lockout, automatic recharge and a status pin to indicate

charge termination and the presence of an input voltage.

Order Information

LP28056 - □ □ □

F: Pb-Free

Package Type

SP: SOP-8(P)

Applications

Portable Media Players/MP3 players

Cellular and Smart mobile phone

PDA/DSC

Bluetooth Applications

Features

Very Low Power Dissipation

Vin Over Voltage Protection:6.5V

Short-circuit protection

Programmable Charge Current Up to 1200mA

No MOSFET, Sense Resistor or Blocking Diode

Required

Constant-Current/Constant-Voltage Operation with

Thermal Regulation to Maximize Charge Rate Without

Risk of Overheating

Charges Single Cell Li-Ion Batteries Directly from USB

Port

25µA Supply Current in Shutdown

Time Pre-charge Conditioning With Safety Timer

Reverse Leakage Protection Prevents Battery

Drainage Charge Current Thermal Regulation Status

Outputs for LED or System Interface

Indicates Charge and Fault Conditions

Optional Battery Temperature Monitoring Before and

During Charge Automatic Sleep Mode for Low-Power

Consumption Available in SOP-8P Package

RoHS Compliant and 100% Lead (Pb)-Free

Typical Application Circuit

1K

BATTERY

VIN

10uF

4.7uF

Rset

STAT1

7

VSS

3

STAT2

6

ISET

2

VIN

4

BATT

5

PGND

9

LP28056SPF

Marking Information

LP28056.