TP4056 is a double switch buck single cell 4. 2V lithium battery charge management chip. TP4056 have 5V-18V wide input voltage, dual battery trickle charge into pre-charge the maximum charge current up to 1A. TP4056 with a frequency of 400kHz switching mode makes it possible to use a smaller outer Suo device and the large current charging still maintain a smaller amount of heat. TP4056 built-in power PMOSFET, anti-intrusion circuit, so no anti-intrusion protection and other external Schottky diode. Features: - 4.2v lithium rechargeable single - Programmable charge current. 0. 1A-1A - Programmable steady precharge current 10% -100%. - Wide operating voltage, maximum reach 8V - Red and green LED charge status indicator - Chip temperature protection, overcurrent protection, undervoltage protection - Battery temperature protection, reverse battery shutdown, short circuit protection - Switching frequency 400Khz, usable inductance 22uH and more Maximum Ratings: - BAT Short-Circuit Duration: Continuous - Operating environment Temperature range: -40 ° -85 ° - Storage temperature range: -65 ° - 125 ° Watch video instruction and download datasheet: http://bit.ly/tc4056