General Description
The TP4057 is a highly advanced Lithium-Ion (Li-Ion) and Lithium–Polymer (Li-Pol) linear charge management controller for use in cost sensitive and portable applications. It combines high accuracy constant-current and constant- voltage regulation, cell preconditioning, temperature monitoring, automatic charge termination, charge-status indication, in a space-saving MSOP-8 package.
The TP4057 applies a constant current up to 1A to the battery and the charge current can be programmed externally with a sense-resistor.
The TP4057 automatically terminates the charge cycle when the charge current drops to the charge termination threshold (ITERM) after the charge-regulation voltage is reached.
When the input supply is removed , the TP4057 automatically enters a low-power sleep mode. A battery charge state output pin is provided to indicate battery charge status through a display LED. The battery charge status output is a serial interface which may also be read by a system microcontroller.

Features
● 4.5V-15V Wide Input Voltage Range
● Ideal for Single Cell (4.1V or 4.2V) and Dual-Cell (8.2V or 8.4V) Li-Ion or Li-Pol Batteries
● Preset Charge Voltage with ±1% Accuracy
● Programmable Charge Current up to 1A
● Constant-Current/Constant Voltage Operation
● Preconditioning of Low Voltage Cells
● Optional Cell-Temperature Monitoring Before and During Charge
● Charge Status Output for Single of Dual Led or Host Processor Interface
● Automatic Battery Recharge
● Charge Termination by Minimum Current
● Automatic Low-Power Sleep Mode When Input Power is Removed
● Available in MSOP-8 Package
● RoHS Compliant and 100% Lead (Pb)-Free

Applications
● Cellular Phones / PDAs/ MP3 Players/DSC
● Handheld Instruments