5V 1A 2.1A 3 USB Mobile Power Bank Charger Module Charging Circuit Board Step Up Boost Power Supply Module DIY

Charging and discharging of synchronous switch ? 2.1a Synchronous Boost conversion, 2.1a synchronous switch charging ? boost efficiency up to 92% ? charging efficiency up to 93% ? built in power path management, supporting charging while charging ? adaptive charging current regulation, matching all adapters ? charging voltage accuracy: ± 30mV ? support 4.20v/4.35v battery (selected by external resistance) power display ? support 4 / 3 / 2 / 1 LED power display with rich functions ? key on ? built in lamp drive, no current limiting resistor required ? automatic detection of low power consumption of mobile phone insertion and extraction ? intelligent identification of load, automatic standby ? minimum standby power consumption less than 30uabom ? power MOS is built-in, single inductor realizes multiple protection of charge and discharge, high reliability ? output overcurrent, overvoltage and short circuit protection ? input over-voltage, overcharge, over discharge and over-current discharge protection ? over temperature protection of the whole machine ESD 4KV