System Board 6722

MAXREFDES1198: Ultra-Miniature 4.5V to 36V Input and 3.3V, 2A, High-Efficiency, Synchronous Step-Down DC-DC Converter Reference Design

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Input Type VIN (MIN)
Isolated/Non-Isolated Topology
DC 4.5 36 2 Single 3.3 6.6 Non-Isolated Buck

The MAX17632 family of parts (MAX17632A, MAX17632B, and MAX17632C) includes high-efficiency, high-voltage, synchronous step-down DC-DC converters with integrated MOSFETs operating over an input-voltage range of 4.5V to 36V. These parts can deliver current up to 2A. The MAX17632A and MAX17632B are fixed 3.3V and fixed 5V output parts, respectively. The MAX17632C is an adjustable output voltage (0.9V to 90% of VIN) part. Built-in compensation across the output-voltage range eliminates the need for external compensation components. The MAX17632 features peak-current-mode control architecture. The device can be operated in forced pulse width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions.

Key Features

  • Wide 4.5V to 36V Input
  • 3.3V Output
  • Up to 2A Output Current
  • Fully Assembled and Tested
  • Proven PCB Layout
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Designed, Built, Tested

This document provides a detailed systematic technical guide for the design of a buck converter using the MAX17632 for smaller size. Refer to the MAX17632 IC data sheet and MAX17632A EV kit data sheet for device operation details. The converter design has been built and tested, details of which follow later in this document.

Design Resources


4.5V to 36V, 2A, High-Efficiency, Synchronous Step-Down DC-DC Converter

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