TP4055 is a complete single-cell lithium-ion battery charger with reverse polarity protection of battery positive and negative poles, using constant current and constant voltage linear control. Its SOT package and low external component count make the TP4055 ideal for portable applications. TP4055 can work with USB power and adapter power.

External sense resistors and blocking diodes are not required due to the use of an internal PMOSFET architecture, coupled with a reverse charge protection circuit. Thermal feedback automatically adjusts the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The full voltage is fixed at 4.2V, while the charge current can be set externally with a resistor. When the battery reaches 4.2V, the charging current drops to the set value of 110, and the TP4055 will automatically terminate the charging.

When the input voltage (AC adapter or USB power supply) is removed, the TP4055 automatically enters a low current state

state, the battery leakage current is below 2uA. Additional features of the TP4055 include a charge current monitor, undervoltage lockout, automatic

automatic recharge and a status pin to indicate end of charge and input voltage

Features

Lithium battery positive and negative polarity reverse protection;

Programmable charging current up to 500mA;

No MOSFETs, sense resistors or blocking diodes required;

·For single-cell lithium-ion battery

Constant current constant voltage operation with thermal regulation that maximizes charging rate without danger of overheating;

· Single-cell Li-ion battery can be charged directly from the USB port;

The highest input can reach 9V;

4.2V preset charging voltage with an accuracy of ±1%;

· Automatic recharging;

1 open-drain output pin for state of charge;

·C10 charging termination;

The power supply current in standby mode is 40uA;

2.9V trickle charge;

Soft start limits inrush current;

• Available in a 5-pin SOT-23 package.

application

·Charging stand

·mobile power

Cell phones, PDAs, MP3 players

·Bluetooth application

typical application

500mA Single Cell Li-Ion Battery Charger

Absolute Maximum Ratings

·Input power supply voltage (VCC): -0.3V～9V

·PROG: -0.3V～VCC+0.3V

·BAT: -4.2V～7V

·CHRG: -0.3V～10V

BAT short circuit duration: continuous

·BAT pin current: 500mA

·PROG pin current: 800uA

·Maximum junction temperature: 145℃

·Working environment temperature range: -40℃～85℃

·Storage temperature range: -65℃～125℃

·Pin temperature (soldering time 10 seconds): 260℃

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