Industry White Paper

Monolithic 65 V, 8 A Step-Down Regulators with Fast Transient Response and Ultralow EMI Emissions

August 24, 2022 by Analog Devices
Topics Covered
  • Wide Input Range and High Output Current Monolithic Solution
  • Small Minimum On-Time and High Step-Down Ratio

Design Note Overview


When designing buck converters for 48 V bus systems, power supply engineers are inclined to choose controller solutions (external MOSFETs) over much smaller monolithic regulators (internal MOSFETs), since few monolithic regulators are able to handle such high input voltages and most are limited to output currents less than 5 A. The LT8645S/LT8646S monolithic regulators break this mold.

In this design note by Analog Devices, learn about the LT8645S and LT8646S are 65 V synchronous step-down monolithic regulators, capable of supporting 8 A outputs. Their Silent Switcher® 2 architecture enables exceptional EMI performance regardless of layout. The LT8646S features RC external compensation to optimize transient responses.