5A/12V step-down DC-DC converter using MAX17506 with integrated HS switch and external LS switch

The MAX17506 is a high-efficiency switching regulator that delivers up to 5A load current at output voltages from 0.9V to (0.9 x V_IN). The device integrates the highside MOSFET and operates over 4.5V to 60V, making it ideal for on-board point-of load and post-regulation applications.

The device features a peak current-mode control architecture. Built-in compensation across the output voltage range eliminates the need for external compensation components. The feedback regulation accuracy over -40°C to +125°C is ±1.4%.

Output overload hiccup protection and cycle-by-cycle peak-current limit provide for ultra-safe operation in short-circuit conditions.

Key Features

• No Schottky-Synchronous Operation
• Internal Compensation for Any Output Voltage
• Built-In Soft-Start
• 100kHz to 2.2MHz Adjustable Switching Frequency
• 3.5μA Shutdown Current
• Hiccup or Latchoff Mode Overload Protection
• Programmable EN/UVLO Threshold
• Overtemperature Protection/li>

This board is not available for purchase.

In this document a step-down DC-DC converter using the MAX17506 is demonstrated for a 12V output application. The power supply delivers up to 5A at 12V.

Designed, Built, Tested

This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a step-down (buck) DC-DC converter using Maxim’s MAX17506 current-mode controller. The power supply has been built and tested, details of which follow later in this document.

Design Resources