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ECB及LCD偏置电源,带有精确的输出电压及温度补偿

高精度偏置电源,允许使用低成本彩色ECB LCD

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主要特征

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主要特征

  • High-Accuracy Reference Voltage (±1%)
  • ±11ppm/°C Output Voltage Drift
  • On-Chip Temperature Sensor Output
  • Accurate Voltage and Temperature Provide:
    • Consistent ECB Colors
    • Consistent LCD Gray-Scale Contrast
  • +2.7V to +5.5V Input Voltage Range
  • Output Voltage Range
    • +2.5V to +16V in Internal Feedback Mode
    • Programmable in External Feedback Mode
  • Dynamic Control of the Output Voltage
  • 67µA Supply Current
  • 0.4µA Shutdown Current
  • 10-Pin µMAX Package (1.09mm max height)
  • Evaluation Kit Available (MAX1729EVKIT)

应用/用途

  • 蜂窝电话
  • ECB显示器偏置与彩色调节
  • LCD显示器偏置与对比度调节
  • PDA及其它手持设备

描述

The MAX1729 micropower step-up/step-down DC-DC converter is ideally suited for electrically controlled birefringence (ECB) and liquid-crystal-display (LCD) bias-supply generation. It provides step-up/step-down voltage conversion and reduces output ripple by using a step-up DC-DC converter followed by a linear regulator. This architecture permits a physically smaller inductor than those used in competing SEPIC and flyback topologies. This device features low quiescent current (67µA typical). A logic-controlled shutdown mode further reduces quiescent current to 0.4µA typical.

The MAX1729 features an input that dynamically adjusts the output voltage to control display color or contrast. It offers two feedback modes: internal and external. Internal feedback mode allows output voltages between 2.5V and 16V, and is specifically designed to hold temperature drift to ±11ppm/°C. External feedback mode allows the MAX1729 output voltage range to be tailored for various displays.

An on-chip temperature sensor with a positive temperature coefficient provides compensation for LCD/ECB display temperature characteristics. In internal feedback mode, the buffered temperature sensor output is read and used to adjust the output voltage via a digital control signal. External feedback mode features an additional compensation method in which the temperature output is summed directly into the feedback network to provide first-order negative temperature compensation of the output voltage. The MAX1729 is available in the space-saving 10-pin µMAX package.

简化框图

MAX1729:典型工作电路 MAX1729: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