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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

产品详情

主要特征

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 28
# Step-Down Outputs 2
# Step-Up Outputs 1
Battery Charger Features Battery Backup
VOUT (V) (min) 1
VOUT (V) (max) 5.5
Package/Pins QSOP/28
Budgetary
Price (See Notes)
4.48
缩小

简化框图

Technical Docs

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参量

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 28
# Step-Down Outputs 2
# Step-Up Outputs 1
Battery Charger Features Battery Backup
VOUT (V) (min) 1
VOUT (V) (max) 5.5
Package/Pins QSOP/28
Budgetary
Price (See Notes)
4.48

主要特征

  • 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

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 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 at over 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.

简化框图

MAX1774:功能框图 MAX1774:功能框图 Zoom icon

Technical Docs

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