1.Explanation

TP4057-42 is suitable for single-cell lithium battery charger, with battery positive and negative pole reverse connection protection, using constant current/constant voltage linear control. TP4057-42 is suitable for USB power supply and adapter power supply work. TP4057-42 adopts internal PMOSFET architecture, plus anti-reverse charging circuit, does not require external detection resistor and isolation diode. Thermal feedback can automatically adjust the charging current. The charging current can be set externally via a resistor. When reaching 4.2V, the charging current drops to 1/10 of the set value, TP4057-42 will automatically terminate the charging

2.Detailed introduction of TP4057-42
TP4057-42 is suitable for single-cell lithium battery charger, with battery positive and negative pole reverse connection protection, using constant current/constant voltage linear control. TP4057-42 is suitable for USB power supply and adapter power supply work.
TP4057-42 adopts internal PMOSFET architecture, plus anti-reverse charging circuit, does not require external detection resistor and isolation diode. Thermal feedback can automatically adjust the charging current. The charging current can be set externally via a resistor. When the battery reaches 4.2V, the charging current drops to 1/10 of the set value, and the TP4057-42 will automatically terminate charging.
When the input voltage (AC adapter or USB power supply) is removed, the TP4057-42 automatically enters a low current state, and the battery leakage current is below 2uA. Other features of the TP4057 include charging current monitoring, undervoltage lockout, automatic recharge, and two status pins for indicating the end of charging and input voltage access

3.TP4057-42 application
·Charging base
·Programmable charging current up to 500mA;
·Cell phone, PDA, MP3 player
·Bluetooth application
·For single cell lithium ion battery
TP4057-42 features
·Reverse connection protection of positive and negative poles of lithium battery;
No MOSFET, sense resistor or isolation diode required;
·Constant current/constant voltage operation, and has no danger of overheating
Thermal regulation function to maximize the charging rate under dangerous conditions;
·Single lithium-ion battery can be charged directly from the USB port;
· 4.2V preset charging voltage with accuracy of ±1%;
·The highest input can reach 9V;
·Automatic recharge;
· 2 open-drain output pins in charge state;
·C/10 charge termination;
·The power supply current in standby mode is 40uA;
· 2.9V trickle charging device version;
· Soft start limits inrush current; 400
Full charge cycle of mA current (600mAh)
·Adopt 6-lead SOT-23 package.
TP4057-42 excellent maximum rating
·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℃
·Lead temperature (solder time 10 seconds): 260℃

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