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
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
语言下载文件备注
英文MAX1775.pdfRev 2; 01/2010
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX17752.7281.255.5
  • 1.8
  • 3.3
  • Preset
  • Resistor
2ExternalYes21250QSOP/16$3.57 @1k
开发工具
质量和环境数据
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
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1775EEE停止供货MAX1775EEE+QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1775EEE+生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1775EEE+T生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1775EEE-T停止供货MAX1775EEE+TQSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1775.pdf MAX1775
MAX1775.pdf MAX1775
MAX1775.pdf MAX1775
MAX1775.pdf MAX1775
典型工作电路 MAX1775