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MAX1775：双输出、降压型DC-DC转换器，用于PDA/掌上电脑

双输出降压转换器，用于PDA和掌上电脑

The MAX1775 dual, step-down DC-DC converter generates both the main (+3.3V at over 2A) and core (+1.8V at up to 1.5A) supplies for a complete power solution for PDAs, subnotebooks, and other hand-held devices. The main output is adjustable from +1.25V to +5.5V. The core output is adjustable from 1V to 5V. Both switching converters operate at up to 1.25MHz for small external components and use synchronous rectifiers to achieve efficiencies up to 95%. Operation with up to 100% duty cycle provides the lowest possible dropout voltage to extend useful battery life. The MAX1775 accepts inputs from +2.7V up to +28V, allowing use with many popular battery configurations as well as AC-DC wall adapters. Digital soft-start reduces battery current surges at power-up. Both the main and core converters have separate shutdown inputs. The MAX1775 comes in a small 16-pin QSOP package. The MAX1775 evaluation kit is available to help reduce design time.

关键特性 Dual, High-Efficiency, Synchronous Rectified Step-Down Converter 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 92% Efficiency 100% (max) Duty Cycle Up to 1.25MHz Switching Frequency Input Voltage Range from +2.7V to +28V 170µA Quiescent Current 5µA Shutdown Current Digital Soft-Start Independent Shutdown Inputs

MAX1775：典型工作电路 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

• MAX1775EVKIT

质量和环境数据

• MAX1775.pdf

相关产品

• MAX1774：双路、高效率、降压型转换器，带有备用电池切换开关

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