This document introduces the LT ®3434, 3A monolithic buck switching regulator, which is designed to optimize efficiency over all current and voltage levels, both high and low, while having low quiescent current and low dropout. Micropower bias current and Burst Mode ® operation enable it to consume merely 100µA at zero load and 12V input. The high efficiency bipolar NPN power switch (0.1Ω) provides up to 85% efficiency at a 2A load current. Combined with high duty cycle, the low dropout of the switch maintains a regulated 3.3V output down to 4V input at all load currents.
This document is a design note (DN352) for the LT3434, a monolithic buck switching regulator designed to optimize efficiency over a wide range of currents and voltages. It features Burst Mode operation to achieve 100uA quiescent current at zero load and maintains regulation down to a 4V input voltage.
The device provides a switch current rating that supports maximum load currents of up to 2.5A.
The converter maintains a regulated 3.3V output down to 4V input at all load currents.
The device consumes merely 100uA at zero load and 12V input.