The LTC3899 operates from an input voltage of 4.5V to 60V during start-up and maintains operation down to 2.2V after start-up. The boost and buck converters can produce output voltages up to 60V with efficiencies as high as 95%. In applications where the input voltage may exceed the boost regulated output voltage, the LTC3899 keeps the synchronous boost MOSFET on continuously so that the output voltage follows the input voltage with minimal power loss. The LTC3899 can be configured for Burst Mode® operation, reducing quiescent current to 29µA for one channel and 39µA for all three channels, with outputs in regulation in standby, a useful feature for preserving battery run times. The powerful 1 Ω onboard, all N-channel, gate drivers minimize MOSFET switching losses and provide for output currents of more than 10A per channel, limited only by external components. The LTC3899’s constant frequency current mode architecture enables a fixed frequency from 50kHz to 900kHz, or it can be synchronized to an external clock from 75kHz to 850kHz. Additional features include an onboard LDO for IC power and gate drive, output voltage tracking or adjustable soft start and a Power Good signal.