This design note introduces the LTC3890 high effi ciency dual output step-down converter that can produce 3.3V and 8.5V outputs from a 9V to 60V rail. This 50μA quiescent current device can produce two output voltages ranging from 0.8V to 24V when powered from an input voltage of 4V to 60V. The device features up to 99% duty cycle capability for low voltage dropout applications, adjustable soft-start or voltage tracking and selectable continuous, pulse-skip- ping or Burst Mode® operation with a no-consumption standby mode.
This document is Design Note 479 for the Linear Technology LTC3890, a high performance synchronous buck DC/DC switching regulator controller. The device features integrated N-channel MOSFET drivers and operates with a phase-lockable fixed frequency between 50kHz and 900kHz.
The device operates when powered from an input voltage of 4V to 60V.
It can produce two output voltages ranging from 0.8V to 24V.
The device has a no-load quiescent current of only 50uA.