Overview  The LA1631A is an  easy to use  synchronous stepdown Buck, which  integrated with highside and low-side  power MOSFETs. The  LA1631A can provide  up to 1A of output current efficiently with  current-mode control for fast loop  response.  Wide 4.5V to 48V input range  accommodates a variety of power meter  step-down applications. LA1631A uses  high duty cycle and low dropout mode for  low power meter input voltage conditions.  The LA1631A achieves high power  conversion efficiency over a wide load  range by scaling down the switching  frequency under light-load conditions to  reduce switching and gate driving losses.  The LA1631A has built-in full protection  features, cycle-by-cycle current limit,  hiccup mode short-circuit protection, and  thermal shutdown in case of excessive  power dissipation. LA1631A is available in  a cost-effective SOT23-6 package.