View ltc14367afa datasheet:

LTC1436A LTC1436A-PLL/LTC1437A High Efficiency Low Noise Synchronous Step-Down Switching Regulators FEATURES DESCRIPTION The LTC®1436A/LTC1437A are synchronous step-down Maintains Constant Frequency at Low Output Currents Dual N-Channel MOSFET Synchronous Drive switching regulator controllers that drive external Programmable Fixed Frequency (PLL Lockable) N-channel power MOSFETs in a phase lockable, fixed Wide VIN Range: 3.5V to 36V Operation frequency architecture. The Adaptive PowerTM output stage Low Minimum On-Time (?300ns) for High selectively drives two N-channel MOSFETs at frequencies Frequency, Low Duty Cycle Applications up to 400kHz while reducing switching losses to maintain Very Low Dropout Operation: 99% Duty Cycle high efficiencies at low output currents.