器件号	Replacement	Explanation

说明

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The MAX1680/MAX1681 inductorless switched-capacitor voltage converters either invert an input voltage of +2.0V to +5.5V or double it while supplying up to 125mA output current. They have a selectable-frequency option that allows the use of small capacitors: 4.7µF (MAX1680), 1µF (MAX1681). With their high output current capability, these charge-pump devices are suitable replacements for inductor-based regulators, which require more expensive external components and additional board space.

The devices' equivalent output resistance (typically 3.5Ω) allows them to deliver as much as 125mA with only a 440mV drop. A shutdown feature reduces quiescent current to less than 1µA. The MAX1680/MAX1681 are available in 8-pin SO packages. For devices that deliver up to 50mA in smaller µMAX® packages, refer to the MAX860/MAX861 data sheet.

MAX1680、MAX1681：典型工作电路 放大+

关键特性

• Selectable Switching Frequencies:
  • 125kHz/250kHz (MAX1680)
    
  • 500kHz/1MHz (MAX1681)
• Allow Use of Small Capacitors (1µF for the MAX1681)
• 125mA Output Current
• 3.5Ω Output Impedance
• 1µA Logic-Controlled Shutdown
• Configurable as Voltage Inverters or Doublers
• +2.0V to +5.5V Input Voltage Range
• Available in 8-Pin SO Packages
• 90% Efficiency

应用

• 接口供电
• 本地负电源
• MOSFET偏置
• 运算放大器电源