is a boost topology Switching Regulator
control IC for battery-powered applications. The FP5139B
includes a totem-pole single output stage for driving NPN Transistor
or N-MOS, high Precision Reference
voltage(0.5V) to compare output voltage with feedback amplifier, an internal duty time control for controlling the minimum duty cycle, programmable soft start with short circuit protection function and logic level control for operating mode or standby mode.