MAXREFDES1039：64W和48W、双路输出、DC-DC Buck转换器

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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	36	51	2 to 4	Multiple	16 to 24	48 to 64	Synchronous Buck

The MAX17559 is a dual-output, synchronous step-down controller that drives nMOSFETs. The device uses a constant- frequency, peak-current-mode architecture. The two outputs can be configured as independent voltage rails. Input capacitor size is minimized by running the two outputs 180° out of phase. The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback or latch-off limits MOSFET power dissipation under short-circuit conditions. The IC provides independent adjustable soft-starts/stops for each output and can start up monotonically into a pre-biased output. The IC can be configured in either PWM or DCM modes of operation, depending on whether constant-frequency operation or light-load efficiency is desired. The IC operates over the -40°C to +125°C temperature range and is available in a lead(Pb)-free, 7mm x 7mm, 32-pin TQFP, package.

Key Features

Wide 4.5V to 60V Input Voltage Range
Wide 0.8V to 24V Output Voltage Range
RSENSE or Inductor DCR Current-Sensing
Fixed 180° Out-of-Phase Operation
Adjustable 100kHz to 2.2MHz Switching Frequency
Independent Enable and PGOOD
Available in a Lead(Pb)-Free 7mm x 7mm, 32-Pin TQFP Package
Enhances Power Efficiency

Low-Impedance Gate Drives for High Efficiency

DCM Operation at Light Loads
Auxiliary Bootstrap LDO
Operates Reliably in Adverse Industrial Environments
Independent Adjustable Soft-Start/Stop or Tracking
Current Selectable Foldback or Latch-off Limits
MOSFET Heat Dissipation During a Short-Circuit Condition
Operates Over the -40°C to +125°C Temperature Range
Output Overvoltage and Overtemperature Protections

MAXREFDES1039 Board

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This board is not available for purchase.

An offline DCM flyback converter using the MAX17595 is demonstrated for a 4.5V DC output application. The power supply delivers up to 4.5A at 4.5V.

Designed, Built, Tested

This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a dual output buck converter using the Maxim MAX17559 current-mode controller. The power supply has been built and tested, details of which follow later in this document.