The LTC3769 operates over an input voltage range of 4.5V to 60V during start-up, maintaining operation down to 2.3VIN after start-up and can regulate an output as high as 60V. The low 28µA quiescent current extends run time in battery powered applications when in standby mode. In applications where the input voltage may exceed the regulated output voltage, the LTC3769 keeps the synchronous MOSFET continuously ON so that the output voltage follows the input voltage, with minimal power loss. The LTC3769’s current-mode architecture enables a selectable frequency from 50kHz to 900kHz, or it can be synchronized to an external clock from 75kHz to 850kHz. The LTC3769 is available in 20-lead TSSOP and 24-pin 4mm x 4mm QFN packages. Four temperature grades are available, with operation from –40°C to 125°C for the extended and industrial grades, a high temperature automotive range of –40°C to 150°C, and a military grade of –55°C to 150°C.