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125mA、频率可选、开关电容电压变换器

开关频率高达1MHz,允许使用小尺寸电容

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主要特征

应用/用途

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参量

Parametric specs for Charge Pumps
Topology Doubler
Inverter
Unregulated
VIN (V) (min) 2
VIN (V) (max) 5.5
IOUT (A) (typ) 0.125
Unadj. VOUT (V) +2xVIN
-VIN
ICC (mA) (max) 4.5
Switching Frequency (kHz) 250
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.63

主要特征

  • 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/用途

  • 接口供电
  • 本地负电源
  • MOSFET偏置
  • 运算放大器电源

描述

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.

简化框图

MAX1680、MAX1681:典型工作电路 MAX1680、MAX1681:典型工作电路 Zoom icon

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