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MAX1774：双路、高效率、降压型转换器，带有备用电池切换开关

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

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 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

MAX1774：功能框图 应用 手持式计算机 网络浏览器 PDA POS终端 亚笔记本电脑

数据手册DataSheet

关键参数

开发工具

• MAX1774EVKIT

技术资料

• DAC Makes Controller Programmable
• Protection From Blackouts: Dirt Cheap to Fully Integrated

相关产品

• MAX1775：双输出、降压型DC-DC转换器，用于PDA/掌上电脑

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