SYSTEM BOARD 7307

MAXREFDES1255: 4-Switch Buck-Boost Converter


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Input Type VIN (MIN)
(V)
VIN (MAX)
(V)
IOUT
(A)
Single/Multiple
Output
VOUT
(V)
POUT
(W)
Isolated/Non-Isolated Topology
DC 5 36 5 Single 12 60 Non-Isolated 4-Switch Buck-Boost

Introduction

MAXREFDES1255 is a 4-switch buck-boost converter that gives a positive step-up/stepdown output voltage. It uses MAX20048 IC, a current-mode buck-boost controller, which drives four MOSFETs to generate positive buck-boost output. This reference design can operate from 5V to 36V input and deliver up to 5A of load current at 12V output. This design targets automotive applications.

Key Features

  • High efficiency of 90%
  • Very low line and load regulation < 0.5%
  • Output voltage ripple 1% at nominal VIN
  • Internal soft-start
MAXREFDES1255 Board Enlarge+

Designed–Built–Tested

This document describes the hardware above. It provides a detailed, systematic technical guide to design a 4-switch buck-boost converter using Maxim’s MAX20048current-mode controller.

Schematic

Fab Assembly

Test Results


 
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MAX20048
Automotive 40V, 55µA IQ, 2.2MHz, H-Bridge Buck-Boost Controller

  • Meets Stringent Automotive Quality and Reliability Requirements
  • Efficient Solution in a Small Solutions Size
  • Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements