The AP1624 is multi-functional step-up DC/DCcontrollers. Large output current is possible usingan externally connected N channel MOSFET, coil,and diode.Output voltage （VOUT）is programmable with 1.23Vof standard voltage supply internal, and usingexternally connected components, output voltage（FB） can be set up at will.With a 300KHz switching frequency, the size of theexternal components can be reduced.Control switches from PFM to PWM during lightloads with the AP1624（PFM/PWM switchable）andthe series is highly efficient from light loads to largeoutput currents.