System Board 6794

MAXREFDES1174: -24V/150mA, Negative Output Power Supply Using the MAX17501

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Input Type VIN (MIN)
Isolated/Non-Isolated Topology
DC 22 30 0.15 Single -24 3.6 Non-Isolated Buck

The MAXREFDES1174 is centered around the MAX17501 ultra small, high-efficiency, high-voltage, synchronous stepdown DC-DC converter with integrated MOSFETs. This design provides a -24V output and up to 150mA of load current with an input voltage range of 22V to 30V. Unlike a traditional design, this reference design is configured to work in a buck-boost topology to produce negative output voltage from positive input voltage.

Industrial control equipment such as programmable logic controllers, I/O modules, mass flow controllers, and various other sensors and supporting systems use analog components like amplifiers and multiplexers that operate on negative supply voltage. The MAXREFDES1174 is designed to demonstrate the operation and principles on how to use the MAX17501 can be used to provide a negative supply voltage.

Key Features

  • No Schottky-synchronous operation for high efficiency and reduced cost
  • Ultra-compact layout
  • All-ceramic capacitors
  • Reduces power dissipation
MAXREFDES1174 Board Enlarge+

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Designed, Built, Tested

This document describes the hardware shown above. It provides a detailed systematic technical guide for the design of the MAXREFDES1174 using the MAX17501 synchronous step-down DC-DC converter for applications that required negative supply voltage. Refer to the MAX17501 IC data sheet for device operation details. The power supply has been built and tested, details of which follow later in this document.

Design Resources


60V, 500mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter

  • Eliminates External Components and Reduce Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation