MAX1774 - 双路、高效率、降压型转换器，带有备用电池切换开关

MAX1774是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1774是双路、高效率、降压型转换器，带有备用电池切换开关，本站介绍了MAX1774的封装应用图解、特点和优点、功能等，并给出了与MAX1774相关的Maxim元器件型号供参考。

MAX1774 - 双路、高效率、降压型转换器，带有备用电池切换开关 - DC-DC开关调节器 - 双输出降压型DC-DC转换器，用于PDA/掌上电脑，提供自动电池切换 - 美信半导体

产品概述

The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.

The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V atover 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs.

When the AC adapter power is removed, an external P-channel MOSFET switches input to the main battery. When the main battery is low, the backup step-up converter sustains the main output voltage. When the backup battery can no longer deliver the required load, the system shuts down safely to prevent damage. Four on-board voltage detectors monitor the status of the AC adapter power, main battery, and backup battery.

The MAX1774 evaluation kit is available to help reduce design time.

关键特性

以下关键特性由Maxim美信半导体提供：

Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters

Thin, Small (1mm High) QFN Package

Step-Up Converter for Backup Battery

Main Power

Adjustable from +1.25V to +5.5V

Over 2A Load Current

Up to 95% Efficiency

Core Power

Adjustable from 1V to 5V

Internal Switches

Up to 1.5A Load Current

Up to 91% Efficiency

Automatic Main Battery Switchover

100% (max) Duty Cycle

Up to 1.25MHz Switching Frequency

Input Voltage Range from +2.7V to +28V

Four Low-Voltage Detectors

170µA Quiescent Current

8µA Shutdown Current

Digital Soft-Start

Independent Shutdown Inputs

热门应用

手持式计算机

网络浏览器

PDA

POS终端

亚笔记本电脑

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