Overview

Features and Benefits

  • 400mA Guaranteed Output Current
  • Internal Synchronous Rectifier for >90% Efficiency
  • Tiny 6-Pin SOT23 Package
  • Available in 6-Pin TDFN Package (MAX1920)
  • Up to 1.2MHz Switching Frequency for Small External Components
  • 50µA Quiescent Supply Current
  • 0.1µA Logic-Controlled Shutdown
  • 2V to 5.5V Input Range
  • Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921)
  • Adjustable Output Voltage (MAX1920)
  • ±1.5% Initial Accuracy
  • Soft-Start Limits Startup Current
  • Product Details

    The MAX1920/MAX1921 step-down converters deliver over 400mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (50µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination makes the MAX1920/MAX1921 excellent high-efficiency alternatives to linear regulators in space-constrained applications.

    Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.

    The MAX1920 provides an adjustable output voltage (1.25V to 4V). The MAX1921 provides factory-preset output voltages (see the Selector Guide). Both are available in space-saving 6-pin SOT23 packages. The MAX1920 is also available in a 6-pin TDFN package.

    Applications

    • Battery-Powered Applications
    • CDMA Power Amplifier Supply
    • Next-Generation Wireless handsets
    • PDAs, Palmtops, and Handy Terminals

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Evaluation Kits (1)

    Reference Designs (1)

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    PCN-PDN Information

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