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    ST1S40IPHR

    ST1S40IPHR

    ST1S40IPUR

    ST1S40IPUR

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    ST1S40IDR

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    3 A DC step-down switching regulator
    Learn More about ST1S40IDR

    Quantity $ per Unit Savings
    1 - 9$2.230%
    10 - 24$2.029%
    25 - 99$1.9015%
    100 - 140$1.6227%
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    In stock
    $2.23
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    Parameter NameParameter Value
    Input Voltage Min Volt4.0
    Input Voltage Max Volt18.0
    ECCN USEAR99
    ECCN EUNEC
    Packing TypeTape And Reel
    RoHs compliantEcopack2
    GradeIndustrial
    Package NameSO-8

    The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.


    The ST1S40 integrates a 95 mΩ high side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.


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


    The ST1S40 is available in VFQFPN 4 mm x 4 mm 8 lead package, HSOP-8 and standard SO-8 package.

    Key features
    • 3 A DC output current
    • 4.0 V to 18 V input voltage
    • Output voltage adjustable from 0.8 V
    • 850 kHz switching frequency
    • Internal soft-start
    • Integrated 95 mΩ and 69 mΩ Power MOSFETs
    • All ceramic capacitor
    • Enable
    • Cycle-by-cycle current limiting
    • Current fold back short-circuit protection
    • VFQFPN4x4-8L, HSOP-8, and SO-8 and packages
    Associated Products