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数字调节LCD偏置电源

业内首款可数字调节的正、负LCD偏置电源

产品详情

主要特征

简化框图

Technical Docs

数据资料 数字调节LCD偏置电源 Jan 01, 1998

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主要特征

  • 1.8V to 20V Battery Input Voltage
  • Automatic Disable when Display Logic is Shut Down
  • Extremely Small QSOP Package
  • 32-Level Internal DAC
  • SMBus Serial Interface (MAX1621)
  • Positive or Negative Output Voltage

应用/用途

  • 笔记本电脑
  • 掌上电脑
  • PDA及其它手持设备
  • 便携式数据收集终端

描述

The MAX1620/MAX1621 convert a 1.8V to 20V battery voltage to a positive or negative LCD backplane bias voltage. Backplane bias voltage can be automatically disabled when the display logic voltage is removed, protecting the display. These devices use very little PC board area, come in ultra-small QSOP packages, and require only small, low-profile external components.

Output voltage can be set to a desired positive or negative voltage range with external resistors, and adjusted over that range with the on-board digital-to-analog converter (DAC) or with a potentiometer. The MAX1620/ MAX1621 include a 5-bit DAC, allowing digital software control of the bias voltage. The MAX1620 uses up/down digital signaling to adjust the DAC, and the MAX1621 uses the System Management Bus (SMBus™) 2-wire serial interface.

These devices use a low-cost, external, N-channel MOSFET power switch or NPN transistor, and can be configured for positive or negative output voltages. Operating current is a low 150µA, typically provided from a display's logic supply of 3.0V to 5.5V. The MAX1620/MAX1621 are available in a 16-pin QSOP package.

简化框图

MAX1620、MAX1621:典型工作电路 MAX1620、MAX1621:典型工作电路 Zoom icon

Technical Docs

数据资料 数字调节LCD偏置电源 Jan 01, 1998

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