，3.0v 升压12v2a ，3.0v ～4.2v 锂电池升压12v2a ，fp5208      the fp5208 fp5208a and fp5208b are boost topology switching regulator for wide operating  voltage applications. they provide built-in gate driver pin for driving external n-mosfet. the  non-inverting input of error amplifier connects to a 0.6v precision reference voltage. they have  programmable softstart time set by external capacitors. fp5208 and fp5208b have programmable  frequency set by external resistors. fp5208a and fp5208b have programmable current detection and  over current protection set by external resistors.         the fp5208a and fp5208b are available in the small footprint dfn-12l package to fit in  space-saving pcb layout for application fields. features wide