系统板 MAXREFDES1032

5A/12V Step-Down DC-DC Converter with Integrated HS Switch and External LS Switch Using the MAX17506

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概述

概述

Input Type	V_{IN (MIN)} (V)	V_{IN (MAX)} (V)	I_OUT (A)	Single/Multiple Output	V_OUT (V)	P_OUT (W)	Topology
DC	19	40	0.3	Single	24	7.2	Flyback

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>

MAXREFDES1032 Hardware

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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.