MAX1921

PRODUCTION

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

Part Models
10
1ku List Price
Starting From $1.78
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Part Details

  • 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
  • MAX1921
    Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
    MAX1920, MAX1921: Typical Operating Circuit
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    Documentation

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    Evaluation Kits

    MAX1921EVKIT

    Evaluation Kit for the MAX1920, MAX1921

    Features and Benefits

    • 2V to 5.5V Input Voltage Range
    • Output Voltage
      • 1.8V Fixed Output Voltage (MAX1921EUT18-T)
      • Adjustable Output Voltage (MAX1920EUT-T)
      • Other Fixed-Output Voltages (MAX1921EUT_ _-T)
    • Output Current
      • Guaranteed 400mA at >2.5V Input Voltage
    • IC Shutdown Current
      • 0.1µA (typ)
    • Surface-Mount Components
    • Fully Assembled and Tested

    Product Details

    The MAX1921 evaluation kit (EV kit) provides a fixed 1.8V output voltage from a 2V to 5.5V input source and delivers up to 400mA output current. The MAX1921 is a step-down switching regulator with an internal power switch and synchronous rectifier in a tiny SOT23 package.

    The MAX1921 EV kit is a fully assembled and tested surface-mount circuit board. The MAX1921 EV kit can also be used to evaluate other fixed-output voltage versions of the MAX1921 or the MAX1920, which is a step-down switching regulator with an adjustable output voltage. Additional pads on the board are provided for external feedback resistors to set different output voltages, 1.25V to VIN.

    Applications

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

    MAX1921EVKIT
    Evaluation Kit for the MAX1920, MAX1921

    Reference Designs

    maxrefdes117fig00
    MAXREFDES117 Circuits from the lab

    Heart-Rate and Pulse-Oximetry Monitor

    Features and Benefits

    • Optical Heart-Rate Monitor and Pulse Oximetry Solution
    • Tiny 12.7mm x 12.7mm (0.5in x 0.5in) Board Size
    • Low Power
    • Device Drivers
    • Free Algorithm
    • Example C Source Code For Arduino And mbed Platforms
    • Test Data

    Competitive Advantages

    • Highly-integrated, small-size sensor
    • Non-chest based heart-rate/SpO2 detection
    • Ultra-low power consumption
    MAXREFDES117
    Heart-Rate and Pulse-Oximetry Monitor
    maxrefdes117fig00
    maxrefdes117fig01

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