TC4056A Datasheet PDF – Battery Charger IC

This post explains for the charger IC.

Part Number: TC4056A

Function: 1A Linear lithium ion battery charger

Package:  ESOP-8 , DIP-8 Type

Manufacturer: Shenzhen Fu Man Electronics


TC4056A datasheet


The TC4056A is a complete single lithium-ion battery with a constant current / constant-voltage linear charger. As a result of internal PMOSFET Architecture, coupled with anti-down charge circuit, so that no external blocking diode. Thermal feedback to automatically adjust the charging current to limit the die temperature during high power operation or high ambient temperature conditions.

The charge voltage is fixed at 4.2V , The charge current can be set by an external resistor. When the
charge current drops to the final value after reaching float voltage 1/10 Time, TC4056A The charge cycle is automatically terminated.


1. Up 1000mA Programmable charge current

2. No need MOSFET , Sense resistor or blocking diode

3. A single lithium-ion batteries, using SOP Complete Linear charger package

4. Accuracy ± 1.5% of 4.2V Predetermined charge voltage

5. Current monitor for detecting the output of battery

6. Automatic recharge

7. Dual output state of charge, and fault-free battery status display

8. Current supply in the standby mode 55uA

9. 2.9V Trickle Charge version

10. Soft-start limits inrush current


TC4056A Pinout

TC4056A pinout


• mobile phone, PDA

• MP3 , MP4 player

• Digital cameras

• E-dictionary


• Portable equipment, various chargers

Application Circuit :



TC4056A Datasheet PDF

 TC4056A pdf


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BQ24721 Datasheet PDF – Battery Pack Charger

Part Number: BQ24721

Function: High efficiency synchronous battery pack charger

Package: 32-Pin 5×5-mm QFN Type

Manufacturer: Texas Instruments

BQ24721 datasheet


The BQ24721 is a high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.





1. Integrated 5% 5-V LDO When AC Adapter Applied

2. 6-V Drive Supply Voltage for Increased Efficiency

3. Reverse Battery to Adapter Discharge Protection

4. Battery/Adapter to System Power Selector Function

5. Charge and Adapter Overcurrent Protection

6. Battery Thermistor Sense, TS, Comparators

Typical Application



1. Portable Notebook Computers
2. Portable DVD Players
3. Webpads, PC Tablets

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Other data sheets are available within the file: BQ24721C, BQ24721CRHBR, BQ24721CRHBT, BQ24721RHBR

BQ24721 Datasheet PDF Download

BQ24721 pdf