The LTC3857/LTC3858 are low IQ, high efficiency dual output controllers that can be used for a wide range of input and output voltages. They have different output voltage ranges, currents, and operating modes to meet different application requirements.
This document describes the LTC3857 and LTC3858, versatile low quiescent current (Iq) 2-phase dual output synchronous buck controllers. These devices are designed for applications demanding high efficiency and minimal power loss over a broad range of load currents, from virtually no load to many amps.
| Input Supply Range | 4V to 38V (40V abs max) |
|---|---|
| Output Voltage Range | 0.8V to 24V (28V abs max) |
The main differences are in short-circuit operation and light load operation; specifically, the LTC3857 has output voltage tracking during start-up while the LTC3858 does not.
The device features a maximum 99% duty cycle capability, allowing low dropout operation for low input/high output voltage applications.