深圳市科瑞芯电子有限公司

LPSemi/微源半导体 LP28057A ESOP-8 1A独立线性锂离子电池充电器

General Description

The LP28057A is a complete constant-current/constant- voltagelinear charger for single cell lithium-ion batteries. Its ESOP8package and low external component count make theLP28057A ideally suited for portable applications. Furthermore,the LP28057A is specifically designed to work within USBpower specifications. No external sense resistor is needed, andno blocking diode is required due to the internal MOSFETarchitecture. Thermal feedback regulates the charge current tolimit the die temperature during high power operation or highambient temperature. The charge voltage is fixed at 4.2V, andthe charge current can be programmed externally with a singleresistor. The LP28057A automatically terminates the chargecycle when the charge current drops to 1C/10th theprogrammed value after the final float voltage is reached. Whenthe input supply (wall adapter or USB supply) is removed, theLP28057A automatically enters a low current state, droppingthe battery drain current to less than 1μA. Other featuresinclude charge current monitor, automatic recharge and astatus pin to indicate charge termination and the presence of aninput voltage.

Features 

◆ Protection of Reverse Connection of Battery
◆ Programmable Charge Current Up to 1000mA
◆ No MOSFET, Sense Resistor or Blocking Diode Required
◆ Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
◆ 1μA Supply Current in Shutdown
◆ Drainage Charge Current Thermal Regulation Status Outputs for LED or System Interface
◆ Indicates Charge and Full
◆ Optional Battery Temperature Monitoring Before and During Charge Automatic Sleep Mode for Low-Power
◆ 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

产品规格书（部分）