LP28052 –1.2A单节锂电池充电IC。

LP28052General Description
The LP28052 is a complete constant-current/ constantvoltage linear charger for single cell lithium-ion batteries.Its TDFN-10 package and low external component count make the LP28052 ideally suited for portable applications.Furthermore, the LP28052 is specifically designed to work within USB power specifications. Its have a over voltage protection in input with 6.5V and support over zero voltages of battery can charge enable.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 LP28052 automatically terminates the charge cycle when the charge current drops to 1/10th the ISET rammed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the LP28052 automatically enters a low current state, dropping the battery drain current to less than 2μA.The LP28052 can be put into shutdown mode, reducing the supply current to 25μA.Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.

LP28052 Features
 ·LP28052 Very Low Power Dissipation
 ·LP28052 Vin Over Voltage Protection:6.5V
 ·Short-circuit protection
 ·Programmable Charge Current Up to 1500mA
 ·No MOSFET, Sense Resistor or Blocking Diode Required
 ·Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
 ·Charges Single Cell Li-Ion Batteries Directly from USB Port
 ·25μA Supply Current in Shutdown
 ·Time Pre-charge Conditioning With Safety TimerReverse Leakage Protection Prevents Battery
 ·Drainage Charge Current Thermal Regulation StatusOutputs for LED or System Interface
 ·Indicates Charge and Fault Conditions
 ·Optional Battery Temperature Monitoring Before and During Charge Automatic Sleep Mode for Low-Power
 ·Consumption Available in SOP-8P Package
 ·RoHS Compliant and 100% Lead (Pb)-Free

LP28052 Applications
 ·Portable Media Players/MP3 players
 ·Cellular and Smart mobile phone
 ·PDA/DSC
 ·Bluetooth Applications