TOP POWER ASIC Releases Linear Li-lon Battery Charger TP4057 with Highest Input up to 9V and Programmable Charging Current up to 500mA
The TP4057 from TOP POWER ASIC is a complete linear charger for single cell lithium-ion batteries. This chip with reverse battery protection and power supply reverse connect protection. Its SOT23-6 package and low external component count make the TP4057 ideally suited for portable applications. Furthermore, the TP4057 Linear Li-lon Battery Charger can work with USB and wall adapter.
Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The full charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The TP4057 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage reaches.
When the input supply (wall adapter or USB supply) is removed, the TP4057 automatically enters a low current state, dropping the battery drain current to less than 1μA. The TP4057 can be put into shutdown mode, reducing the supply current to 65μA. Other features include under voltage lockout, automatic recharge, and two status pins to indicate charge termination.
FEATURES
Programmable charging current up to 500mA
No MOSFET, sense resistor, or isolating diode required
Lithium-ion batteries Reverse battery protection
Maximize Charge Rate Without Risk of Overheating
For Single Cell titanic acid Lithium-Ion Batteries
Constant-current and constant-voltage control
Charges Single Cell Li-Ion Batteries Directly from USB Port
Preset Charge Voltage with 1% Accuracy
The highest input can be up to 9V
Automatic Recharge
Two Charge Status Output Pins
C/10 Charge Termination
40μA Supply Current in Shutdown
Available in 6-Lead SOT-23 Package
APPLICATIONS
Miniature lithium battery
Cellular phone、PAD、MP3 player
Bluetooth application
TYPICAL APPLICATION
Figure 1 500mA Single lithium battery charger
Note: The proposed R1 dissipation resistor, can get a larger charge current, and also improve the reliability of the machine. Resistance is selected according to the actual situation (0 ~ 0.6Ω).
Full Charge Cycle (600mAh Battery)
ABSOLUTE MAXIMUM RATINGS
VCC：-0.3V～9V
PROG：-0.3V～VCC+0.3V
BAT：-4.2V～9V
CHRG：-0.3V～9V
STDBY：-0.3V～9V
BAT Pin Current：500mA
PROG Pin Current：800uA
Maximum Junction Temperature：145℃
Operating Ambient Temperature Range：-40℃～85℃
Storage Temperature Range：-65℃～125℃
Lead Temperature(Soldering, 10sec)：260℃
ELECTRICAL CHARACTERISTICS
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