Design Support

 

Super Cap is becoming very popular in many applications since its unique feature like more recharge cycle, better transient capacity, simpler charger management and less environment pollution. Typical multi-cell Cap in series requires buck boost topology to charge from empty to full when VIN is below 5V. BQ25703A is good device which can perform quick charging, power path and protection function in single chip. This paper discusses how to use it and some considerations in real application.