System Board 7125

MAXREFDES1202: Dual-Phase Buck Converter with Inductor DCR Current Sensing Using the MAX17558

 Download Reference Design Document

Designed, Built, Tested

The Reference Design Document provides a detailed systematic technical guide to designing a Dual-Phase Buck Converter with Inductor DCR Current Sensing Using the MAX17558. The hardware is shown in the photo above. The hardware was built and tested, details of which are available in the linked Schematic, Bill of Materials and PCB Artwork. It was tested by Maxim’s expert applications engineering team in a state-of-the-art design lab and the Test Results are fully documented.


Input Type VIN (MIN)
Isolated/Non-Isolated Topology
DC 15 55 30 Single 12 360 Non-Isolated Synchronous Buck

The MAXREFDES1202 is a dual-phase, buck converter reference design developed using the MAX17558, MAX15019A, and MAX17552. This reference design is rated to operate over a wide input voltage range from 15V to 55V. The design can deliver an output power of 360W at 12V.

Key Features

  • Very High Efficiency > 95% at Full Load
  • Very Low Line Regulation < 0.1% and Very Low Load Regulation < 0.25%
  • Inductor DCR Current Sensing
  • Output-Voltage Ripple < 0.5% at VIN (nom)
  • Overshoot < 3% for 50% Step Load
MAXREFDES1202 Hardware Enlarge+

This board is not available for purchase.



PCB Layout

Bill of Materials

Test Results


60V, Dual-Output, Synchronous Step-Down Controller

  • Wide Range of Operation
  • Enhances Power Efficiency
  • Operates Reliably in Adverse Industrial Environments

60V, 100mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22μA No-Load Supply Current

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