View ltc1435af datasheet:

LTC1435A High Efficiency Low Noise Synchronous Step-Down Switching Regulator FEATURES DESCRIPTION Dual N-Channel MOSFET Synchronous Drive The LTC®1435A 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. A wide Low Minimum On-Time (?300ns) for High duty cycle range of 5% to 99% allows high VIN to low VOUT Frequency, Low Duty Cycle Applications DC/DC conversion, as well as low dropout operation that Very Low Dropout Operation: 99% Duty Cycle extends operating time in battery-operated systems. Burst Low Standby Current ModeTM operation provides high efficiency at low load Secondary Feedback Control currents. Programmable Soft