View ltc1435f datasheet:

LTC1435 High Efficiency Low Noise Synchronous Step-Down Switching Regulator FEATURES DESCRIPTION Dual N-Channel MOSFET Synchronous Drive The LTC®1435 is a synchronous step-down switching Programmable Fixed Frequency regulator controller that drives external N-channel power Wide VIN Range: 3.5V to 36V Operation MOSFETs using a fixed frequency architecture. Burst Ultrahigh Efficiency ModeTM operation provides high efficiency at low load Very Low Dropout Operation: 99% Duty Cycle currents. A maximum duty cycle limit of 99% provides low Low Standby Current dropout operation which extends operating time in bat- Secondary Feedback Control tery-operated systems. Programmable Soft Start The operating frequency is set by an external capacitor Remote Output Voltage Sense allowing maxi