Linear Technology LTC3810H-5 step down DC/DC controller

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Linear Technology has introduced the LTC3810H-5, a high input voltage synchronous step-down DC/DC controller with guaranteed specifications for junction temperatures as high as 150°C.

The device employs a constant on-time valley current-mode control architecture, delivering low duty cycles and fast transient response with accurate cycle-by-cycle current limit without requiring a sense resistor.

This rugged controller can directly step down voltages from 60 to an output voltage ranging from 0.8 V to 93% of VIN. The 1 Ω onboard gate drivers minimise switching losses associated with driving N-channel MOSFETs at high frequency and high voltage for output currents up to 25 A.

Applications include 48 V power conversion in telecom and datacom, as well as motor vehicle and industrial systems susceptible to high surge voltages.

It features an adjustable minimum on-time that can be set to 100 ns, enabling a high step-down ratio at high frequency. The operating frequency is selectable from 100 kHz to 1 MHz or can be synchronised to an external clock over the same range. Pulse skipping operation can be configured to maintain high efficiency at light loads.

Additional features include programmable soft start or tracking, adjustable cycle-by-cycle current limit, output overvoltage protection, power good output signal and programmable undervoltage lockout.