LP4055-03

Apr.-2017

www.lowpowersemi.com

Page 1 of 8

Preliminary Datasheet

LP4055

800mA Linear Li-Ion Battery Charger

with Protection of Reverse Connection of Battery

General Description

The LP4055 is a complete constant-current/constant- voltage

linear charger for single cell lithium-ion batteries. Its SOT23-5

package and low external component count make the LP4055

ideally suited for portable applications. Furthermore, the

LP4055 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 LP4055 automatically terminates the charge cycle

when the charge current drops to 1/10th the programmed value

after the final float voltage is reached. When the input supply

(wall adapter or USB supply) is removed, the LP4055

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.

Order Information

LP4055 □ □ □ □ □

BAT Voltage

Default: 4.2V

43: 4.35V

F: Pb-Free

Package Type

B5: SOT23-5

QV:TDFN-6

Features



Programmable Charge Current Up to 800mA



No MOSFET, Sense Resistor or Blocking Diode Required



Protection of Reverse Connection of Battery



Constant-Current/Constant-Voltage Operation with

Thermal Regulation to Maximize



Charge Rate Without Risk of Overheating



4.2V /4.35V Charge Voltage with ± 1% Accuracy



Charge Current Monitor Output for Gas Gauging



Automatic Recharge



2.9V Trickle Charge Threshold



C/10 Charge Termination



Output OCP



Charging OTP

Applications



Portable Media Players/MP3 players



Cellular and Smart mobile phone



PDA/DSC



Bluetooth Applications

Marking Information

Part

Marking

Package

Shipping

LP4055B5F

LP4055QVF

LPS

BBYWX

SOT23-5

TDFN-6

3K/REEL

Marking indication:

Y:Production year W:Production week X:Production batch.