LP4054

Aug.-2017

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 1 of 7

Preliminary Datasheet

LP4054

500mA Standalone Linear Li-Ion Battery Charger

General Description

The LP4054 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 LP4054

ideally suited for portable applications. Furthermore, the

LP4054 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 LP4054 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 LP4054

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

LP4054

□ □ □

F

:Pb-Free

Package Type

B5:SOT23-5

Applications



Portable Media Players/MP3 players



Cellular and Smart mobile phone



PDA/DSC



Bluetooth Applications

Features

 Programmable Charge Current Up to 500mA

 No MOSFET, Sense Resistor or Blocking Diode Required

 Constant-Current/Constant-Voltage Operation with

Thermal Regulation to Maximize

 Charge Rate Without Risk of Overheating

 4.2V 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

 Package in SOT23-5

Typical Application Circuit

Marking Information

Part

Marking

Package

Shipping

LP4054B5F

LPS

BFYWX

SOT23-5

3K/REEL

Marking indication:

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

+

1uF

+

10uF

LED

5K

BATT

LP4054B 5F

2

4

5

3

1

GND

VIN

ISET

BAT

CHRG

R

Vin