Asynchronous Boost Controller

  The FP5139B 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.FP5139BWR-LF's datasheet is the same as FP5139B
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FP5139B pinout from datasheet

Download FP5139BWR-LF datasheet