General Description

The LP4056 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 LP4056

ideally suited for portable applications. Furthermore, the

LP4056 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 LP4056 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 LP4056

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.

Features

 Programmable Charge Current up to 1A/800mA

 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 ESOP8