描述 Description

The LP28021S is a complete constant-current/ constant voltage linear charger for single cell lithium-ion battery. Its TDFN-10 package and low external component count make the LP28021S 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 programmed externally with a single resistor. The LP28021S automatically terminates the charge cycle when the charge current drops to 1/10 setting current value after the final float voltage is reached. When the input supply is removed, the LP28021S automatically enters a low current state, dropping the battery drain current to less than 1μA. Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin.

特性 Features

? Input Voltage up to 30V
? Battery Maximum Voltage up to 20V
? Input Over Voltage Protection：6.2V
? Short-circuit protection
? Programmable Charge Current up to 1A
? 1μA Battery Reverse Current
? Protection of Reverse Connection of Battery
? No MOSFET, Sense Resistor or Blocking Diode
Required
? Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
? TDFN-10 3*3mm Package
? RoHS Compliant and 100% Lead (Pb)-Free

應(yīng)用 Application

? Portable Media Players/Game
? Power Bank
? PDA/MID
? Bluetooth Applications