Constant-current/constant-voltage Linear Charger for Single Cell Lithiumion Batteries Suitable for Portable Applications

时间： 2021-08-08 来源：LowPowerSemi

技术问答

LowPowerSemi's LP28056S is a complete constant-current / constant-voltage linear charger for single cell lithiumion batteries. Its ESOP-8 package and low external component count make the LP28056S ideally suited for portable applications. 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 LP28056S automatically terminates the charge cycle when the charge current drops to 1/10th the R_ISET rammed value after the final float voltage is reached. When the input supply is removed, the LP28056S automatically enters a low current state, dropping the battery drain current to less than 1µA. The LP28056S can be put into shutdown mode, reducing the supply current to 1µA.

Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.

Features

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

4.2V Charge Voltage with ± 1% Accuracy

1µA Supply Current in Shutdown

Short-circuit protection

Consumption Available in ESOP-8 Package

RoHS Compliant and 100% Lead (Pb)-Free

Applications

Portable Media Players/MP3 players

Cellular and Smart mobile phone

PDA/DSC

Bluetooth Applications

Order Information

Typical Application Circuit

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微源半导体（LPSemi）电源芯片/音频功放/MOS管/协议芯片选型指南

目录- 公司简介电源芯片协议芯片音频功放 MOS管

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