The TP4056 is a fully integrated constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. Designed with simplicity and efficiency in mind, it requires minimal external components and is ideally suited for portable applications powered by USB. It features internal PMOSFETs and eliminates the need for an external blocking diode. Packaged in a standard SOP-8 form with a heatsink pad, the chip is compact and offers excellent thermal performance.
Features:
Supports charging of 3.7V lithium-ion and lithium-polymer batteries with a maximum charge voltage of 4.2V.
Operates over an input voltage range of 4V to 6.5V, making it ideal for USB and wall adapter use.
Programmable charging current up to 1A by using an external resistor on the PROG pin.
Integrated thermal regulation ensures safe operation by reducing charge current automatically at high temperatures.
Automatically terminates charging when the battery current drops to 1/10 of the programmed current.
Trickle charging starts when the battery voltage is below 2.9V.
Low standby current (<2μA) and shutdown current (~50μA) ensure minimal power draw when not charging.
Charge status indication via CHRG and STDBY pins to drive LEDs.
Includes undervoltage lockout, reverse battery protection, and automatic recharge functionality.
TEMP pin allows connection of a thermistor for temperature monitoring.
Commonly used in DIY battery management boards, 18650 battery packs, portable electronics, and power banks.
