TPOWER TP4057

TP4057 is a single-cell lithium-ion battery constant-current/constant-voltage linear charger. Its simple external application circuit makes it ideal for portable device applications, suitable for operation with USB power supplies and adapter power supplies. An internal reverse-charge protection circuit eliminates the need for an external isolation diode. Thermal feedback automatically adjusts the charging current to limit the die temperature during high-power operation or high ambient temperature conditions. The TP4057 has a charge termination voltage of 4.2V, and the charging current can be set via an external resistor. When the charging current drops to 1/10 of the programmed value, the TP4057 automatically terminates the charging process. When the input voltage is removed, the TP4057 automatically enters a low-current standby state, reducing the standby current to 3μA.

• Maximum charge current: 600mA
• No MOSFET, sense resistor, or isolation diode required
• Thermal regulation for maximum charge rate
• Automatic recharge
• Precharge voltage: 4.2V
• C/10 charge termination
• 2.9V trickle charge threshold
• Separate charge and end-of-charge indicator control signals
• Package: SOT23-6L

• Mobile phones, PDAs, MP3/MP4 players
• Bluetooth headsets, GPS devices
• Charging docks
• Digital cameras, mini speakers, and other portable devices