This IC is Battery Charger.
Part Number: TP4054
Marking : 54b
Function: Linear Li-lon Battery Charger with Thermal Regulation in SOT
Package: SOT23-5 Type
Manufacturer: NanJing Top Power
The TP4054 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its SOT package and low external component count make the TP4054 ideally suited for portable applications. Furthermore, the TP4054 can work within USB and wall adapter. No external sense resistor is needed, and no blocking diode is required due to the internal PMOSFET architecture and have prevent to negative Charge Current Circuit. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature.
1. Programmable Charge Current Up to 800mA
2. No MOSFET, Sense Resistor or Blocking Diode Required
3. Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
4. Charges Single Cell Li-Ion Batteries Directly from USB Port
1. Cellular Telephones, PDAs, MP3 Players
2. Charging Docks and Cradles
3. Blue tooth Applications
Other data sheets are available within the file: TP-4054