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开关电容电压反相器

无电感电源,用于寻呼LCD

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主要特征

应用/用途

简化框图

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主要特征

  • 5-Pin SOT23-5 Package
  • 95% Voltage Conversion Efficiency
  • Inverts Input Supply Voltage
  • 60µA Quiescent Current (MAX828)
  • +1.5V to +5.5V Input Voltage Range
  • Requires Only Two Capacitors
  • 25mA Output Current

应用/用途

  • 电池供电应用
  • 蜂窝电话
  • 手持终端、PDA
  • 医疗仪器
  • 小型LCD板

描述

The ultra-small MAX828/MAX829 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz. Their high efficiency (greater than 90% over most of the load-current range) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and board-level voltage-conversion applications.

The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.

For a similar device with logic-controlled shutdown, refer to the MAX1719/MAX1720/MAX1721. For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX® package.

简化框图

MAX828、MAX829:典型工作电路 MAX828、MAX829:典型工作电路 Zoom icon

技术文档

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