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三路电荷泵TFT LCD DC-DC转换器

业内首款全电荷泵调节器,提供三路输出,用于TFT LCD供电

产品详情

主要特征

简化框图

Technical Docs

数据资料 三路电荷泵TFT LCD DC-DC转换器 Oct 01, 2000

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主要特征

  • Adjustable Outputs
    • Up to +5.5V Main High-Power Output
    • Up to +35V Positive Charge-Pump Output
    • Down to -35V Negative Charge-Pump Output
  • 200kHz to 2MHz Adjustable Switching Frequency
  • +2.7V to +4.5V Input Supply
  • Internal Power MOSFETs
  • 0.1µA Shutdown Current
  • Internal Soft-Start
  • Power-Ready Output
  • Internal Supply Sequencing
  • Fast Transient Response
  • Ultra-Thin Solution (No Inductors)
  • Thin TSSOP Package (1.1mm max)

应用/用途

  • 通信系统

描述

The MAX1747 triple charge-pump DC-DC converter provides the regulated voltages required by active matrix thin-film transistor (TFT) liquid-crystal displays (LCDs) in a low-profile TSSOP package. One high-power and two low-power charge pumps convert the +2.7V to +4.5V input supply voltage into three independent output voltages.

The primary high-power charge pump generates an output voltage (VOUT) between 4.5V and 5.5V that is regulated within ±1%. The low-power BiCMOS control circuitry and the low on-resistance (RON) power MOSFETs maximize efficiency. The adjustable switching frequency (200kHz to 2MHz) provides fast transient response and allows the use of small low-profile ceramic capacitors.

The dual low-power charge pumps independently regulate one positive output (VPOS) and one negative output (VNEG). These additional outputs use external diode and capacitor multiplier stages (as many stages as required) to regulate output voltages up to +35V and -35V.

The constant switching frequency and a proprietary regulation algorithm minimize output ripple and capacitor sizes for all three charge pumps. The MAX1747 is available in the ultra-thin TSSOP package (1.1mm max height).

简化框图

MAX1747:典型工作电路 MAX1747:典型工作电路 Zoom icon

Technical Docs

数据资料 三路电荷泵TFT LCD DC-DC转换器 Oct 01, 2000

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