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    AST1S31HF

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    Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications
    Learn More about AST1S31HF

    Quantity $ per Unit Savings
    1 - 9$4.050%
    10 - 24$3.6410%
    25 - 99$3.4415%
    100 - 249$2.9826%
    250 - 499$2.8230%
    500$2.5437%
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    Out of stock
    $4.05
    Parameter NameParameter Value
    Input Voltage Min Volt2.8
    Input Voltage Max Volt4.0
    ECCN USEAR99
    ECCN EUNEC
    Packing TypeTape And Reel
    RoHs compliantEcopack1
    GradeAutomotive
    Package NameVFDFPN 8 3x3x1.0

    The AST1S31HF is an internally compensated 2.3 MHz fixed frequency PWM synchronous step-down regulator. The AST1S31HF operates from 2.8 V to 4 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.


    The AST1S31HF device integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.


    The peak current mode control with internal compensation deliver a very compact solution with a minimum component count.


    The AST1S31HF is available in a 3 mm x 3 mm, 8-lead VFDFPN package.

    Key features
    • AECQ100 qualified
    • 3 A DC output current
    • 2.8 V to 4 V input voltage
    • Output voltage adjustable from 0.8 V
    • 2.3 MHz switching frequency
    • Internal soft-start and enable
    • Integrated 70 mΩ and 55 mΩ power MOSFETs
    • All ceramic capacitor
    • Power Good (POR)
    • Cycle-by-cycle current limiting
    • Current foldback short-circuit protection
    • VFDFPN 3 x 3 - 8L package