60V Synchronous Step-Down DC/DC Controller Specified Up to 150C

Linear Technology Corp.'s LTC3810H-5 is a high inputvoltage synchronous step-down dc/dc controller with guaranteed specificationsfor junction temperatures as high as 150C. This device employs a constanton-time valley current-mode control architecture, delivering low duty cyclesand fast transient response with accurate cycle-by-cycle current limit withoutrequiring a sense resistor. This rugged controller can directly step downvoltages from 60V to an output voltage ranging from 0.8V to 93 percent of VIN. The powerful 1 Ohm onboard gate drivers minimize switching lossesassociated with driving N-channel MOSFETs at high frequency and high voltagefor output currents up to 25A. Applications include 48V power conversion intelecom and datacom, as well as automotive and industrial systems susceptibleto high surge voltages.

The LTC3810-5 features an adjustable minimum on-time that can be set as low as100ns, enabling a high
step-down ratio at high frequency. The operating frequency is selectable from100kHz to 1MHz or can be synchronized to an external clock over the same range.Pulse skipping operation can be configured to maintain high efficiency at lightloads. Additional features include programmable soft start or tracking,adjustable cycle-by-cycle current limit, output overvoltage protection, powergood output signal and programmable under voltage lockout.

The LTC3810H-5 is offered in a 5 x 5mm QFN-32 package, with 1,000 piece pricingstarting at $3.76 each.

60V Synchronous Step-Down DC/DC Controller Specified Up to 150C