MAX746中文资料高效率、PWM、降压型、N沟道DC-DC控制器数据手册ADI规格书

描述 Description

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.

特性 Features

• 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 Application

• 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

简介

MAX746属于集成电路（IC）的视频处理。由ADI制造生产的MAX746视频处理一种集成电路 (IC) 半导体器件，设计用于在放大、增强、编码器和解码器（编解码器）、缓冲、校准、处理、信号调节、调制与解调、转换、传输、伽玛校正、切换、OSD、数字化和多路复用等应用中处理音频和/或视频信号。