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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

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 28
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 1.8
3.3
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 1250
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.05
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 28
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 1.8
3.3
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 1250
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.05

主要特征

  • 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

应用/用途

  • 手持式计算机
  • 网络浏览器
  • PDA
  • POS终端
  • 亚笔记本电脑

描述

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.

简化框图

MAX1775:典型工作电路 MAX1775:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心