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MAX1681：125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

Up to 1MHz Switching Frequency Allows Small Capacitors

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.

Key Features 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: Typical Operating Circuit Applications/Uses Interface Power Supplies Local Negative Supplies MOSFET Bias Op-Amp Power Supplies

DataSheet

Parametrics

Quality and Environmental Data

• MAX1681.pdf

Related Products

• MAX860：50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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