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数码相机降压型电源

用于数码相机的完备电源方案,2节Li+电池或4节AA电池供电时可提供5路输出

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主要特征

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主要特征

  • 2.5V to 11V Input Voltage Range
  • Main DC-DC Controller
    • 94% Efficiency
    • +2.7V to +5.5V Adjustable Output Voltage
    • Up to 100% Duty Cycle
    • Independent Shutdown
  • Core DC-DC Converter
    • 94% Efficiency
    • Up to 500mA Load Efficiency
    • Output Voltage Adjustable Down to 1.25V
    • Independent Shutdown
  • Three Auxiliary DC-DC Controllers
    • Adjustable Maximum Duty Cycle
    • Independent Shutdown
  • Power, Oscillator, and Reference Outputs to Drive External Slave Controllers (MAX1801)
  • Up to 1MHz Switching Frequency
  • 3µA Supply Current in Shutdown Mode
  • Internal Soft-Start
  • Overload Protection for All DC-DC Converters
  • Compact 32-Pin TQFP Package

应用/用途

  • 数码相机
  • 数字摄像机
  • DVD播放器
  • 手持式设备
  • 网络浏览器
  • PDA

描述

The MAX1802 provides a complete power-supply solution for digital still cameras and video cameras by integrating two high-efficiency step-down DC-DC converters and three auxiliary step-up controllers. This complete solution is targeted for applications that use either three to four alkaline cells or two lithium-ion (Li+) cells.

The main step-down DC-DC controller accepts inputs from 2.5V to 11V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses a synchronous rectifier to regulate the output with up to 94% efficiency. An adjustable operating frequency (up to 1MHz) facilitates designs for optimum size, cost, and efficiency.

The core step-down DC-DC converter accepts inputs from 2.7V to 5.5V and regulates a resistor-adjustable output from 1.25V to 5.5V. It delivers 500mA with up to 94% efficiency.

The three auxiliary step-up controllers can be used to power the digital camera's CCD, LCD, and backlight. The MAX1802 also features expandability by supplying power, an oscillator signal, and a reference to the MAX1801, a low-cost slave DC-DC controller that supports step-up, single-ended primary inductance converter (SEPIC), and fly-back configurations.

The MAX1802 is available in a space-saving 32-pin TQFP package (5mm x 5mm body), and the MAX1801 is available in an 8-pin SOT-23 package. An evaluation kit (MAX1802EVKIT) featuring both devices is available to expedite designs.

简化框图

MAX1802:典型工作电路 MAX1802:典型工作电路 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