システムボード MAXREFDES1020

High Efficiency, Current Mode, Synchronous DC-DC Converter with a 0.68V/4A Output


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Input Type VIN (MIN)
(V)
VIN (MAX)
(V)
IOUT
(A)
Single/Multiple
Output
VOUT
(V)
POUT
(W)
Topology
DC 2.7 4.5 4 Single 0.68 2.7 Synchronous Buck

The MAX15118 high-efficiency, current-mode step-down regulator with integrated power switches operates from 2.7V to 5.5V and delivers up to 18A output current in a small 2mm x 3mm package. The MAX15118 offers excellent efficiency with skip mode capability at lightload conditions, yet provides unmatched efficiency under heavy load conditions. The combination of small size and high efficiency makes this device suitable for both portable and nonportable applications.

The MAX15118 uses a current-mode control architecture with a high-gain transconductance error amplifier, which allows a simple compensation scheme and enables a cycle-by-cycle current limit with fast response to line and load transients. A factory-trimmed switching frequency of 1MHz (PWM operation) allows for a compact, all-ceramic capacitor design.

Integrated switches with low on-resistance ensure high efficiency at heavy loads while minimizing critical inductances.

Key Features

  • ±1% Feedback Accuracy Over Load, Line, and Temperature
  • Input Undervoltage Lockout
  • Programmable Soft-Start
  • Adjustable Soft-Start
  • External Reference Input
  • Selectable Skip Mode Option for Improved Efficiency at Light Loads
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A current-mode synchronous buck is demonstrated using the MAX15118 for a 0.68V DC output application. The power supply delivers up to 6A at 0.68V

Designed, Built, Tested

This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a synchronous buck using Maxim’s MAX15118 current-mode controller. The power supply has been built and tested, details of which follow later in this document.

Design Resources

 
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MAX15118
高効率、18A、電流モード同期ステップダウンレギュレータ、スイッチ内蔵

  • 連続出力電流:18A
  • フィードバック精度:±1% (全負荷、ライン、および全温度範囲)
  • 動作電源電圧:2.7V~5.5V