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MAX1681：125mA、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

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.

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

MAX1680、MAX1681：典型工作电路 应用 接口供电 本地负电源 MOSFET偏置 运算放大器电源

数据手册DataSheet

关键参数

技术资料

• Charge Pump Converts -5V to +5V
• Relay Driver Requires Only 25% Power
• Doubler/Inverter Charge Pumps Divide by Two
• Charge Pump Doubles Negative Voltage
• DC-DC Conversion Without Inductors
• Properties of the Charge-Pump Voltage Splitter

质量和环境数据

• MAX1681.pdf

相关产品

• MAX860：50mA、频率可选的开关电容电压变换器

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