回到顶部

高效率、PWM、降压型、N沟道DC-DC控制器

产品详情

主要特征

简化框图

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

主要特征

  • 93% to 96% Efficiency for 50mA to 3A Output Currents
  • 4V to 15V Input Voltage Range
  • Low 950µA Supply Current
  • 1.4µA Shutdown Current
  • Drives External N-Channel FETs
  • Fixed-Frequency Current-Mode PWM (Heavy Loads)
  • Idle-Mode PFM (Light Loads)
  • Cycle-by-Cycle Current Limiting
  • 2V ±1.5% Accurate Reference Output
  • Adjustable Soft-Start
  • Undervoltage Lockout
  • Precision Comparator for Power-Fail or Low-Battery Warning

应用/用途

  • 5V至3.3V绿色PC应用
  • 电池供电应用
  • 蜂窝电话
  • 笔记本电脑
  • PDA及其它手持设备

描述

The MAX746 is a high-efficiency, high-current, step-down DC-DC power-supply controller that drives external N-channel FETs. It provides 93% to 96% efficiency from a 6V supply voltage with load currents ranging from 50mA up to 3A. It uses a pulse-width-modulating (PWM) current-mode control scheme to provide precise output regulation and low output noise. The MAX746's 4V to 15V input voltage range, fixed 5V/adjustable (Dual-Mode™) output, and adjustable current limit make this device ideal for a wide range of applications.

High efficiency is maintained with light loads due to a proprietary automatic pulse-skipping control (Idle-Mode™) scheme that minimizes switching losses by reducing the switching frequency at light loads. The low 950µA quiescent current and ultra-low 1.4µA shutdown current further extend battery life.

External components are protected by the MAX746's cycle-by-cycle current limit. The MAX746 also features a 2V ±1.5% reference, a comparator for low-battery detection or level translating, and soft-start and shutdown capability.

The MAX747-discussed in a separate data sheet-functions similarly to the MAX746, but drives P-channel logic level FETs.

简化框图

MAX746:典型工作电路 MAX746:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心