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Datasheet Microchip MIC4574-3.3YN

Part NumberMIC4574-3.3YN

The MIC4574 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators


  • Download » Datasheet PDF, 468 Kb, Revision: 11-05-2015
    MIC4574 Data Sheet
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    MIC4574 Micrel, Inc. MIC4574
    200kHz Simple 0.5A Buck Regulator General Description Features The MIC4574 is a series of easy to use fixed and adjustable
    BiCMOS step-down (buck) switch-mode voltage regulators.
    The 200kHz MIC4574 duplicates the pinout and function of
    the 52kHz LM2574. The higher switching frequency may
    allow up to a 2:1 reduction in output filter inductor size.
    The MIC4574 is available in 3.3V, and 5V fixed output
    versions or a 1.23V to 20V adjustable output version. Both
    versions are capable of driving a 0.5A load with excellent line
    and load regulation.
    The feedback voltage is guaranteed to В±2% tolerance for
    adjustable versions, and the output voltage is guaranteed to
    В±3% for fixed versions, within specified voltages and load
    conditions. The oscillator frequency is guaranteed to В±10%.
    In shutdown mode, the regulator draws less than 200ВµA
    standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault
    This series of simple switch-mode regulators requires a
    minimum number of external components and can operate
    using a standard series of inductors. Frequency compensation is provided internally. Fixed 200kHz operation 3.3V, 5V, and adjustable output versions Voltage over specified line and load conditions:
    Fixed version: В±3% max. output voltage
    Adjustable version: В±2% max. feedback voltage Guaranteed 0.5A switch current Wide 4V to 24V input voltage range Wide 1.23V to 20V output voltage range Requires minimum external components < 200ВµA typical shutdown mode 75% efficiency (adjustable version > 75% typ.) Standard inductors and capacitors are
    25% of typical LM2574 values Thermal shutdown Overcurrent protection 100% electrical thermal limit burn-in Applications Simple high-efficiency step-down (buck) regulator ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)




# of Outputs1
Automotive RatedNo
Duty Cycle Max0.95 %
Input Voltage Range4 - 24 V
Light Load Efficiency ModeNo
Operating Temperature Range-40 to +85 °C
Output Current500 mA) Max
Output Voltage Range1.23 V
Quiescent Current5 mA) type
Regulator TypeStep Down (Buck)
SHUTDOWN Current50 µA
Switching Frequency200 kHz
Synchronous RectifierNo
Vfb1.23 V

Eco Plan


Moldel Line

Series: MIC4574 (3)

Manufacturer's Classification

  • Power Management > Switching Regulators > Step Down up to 36V

Other Names:

MIC45743.3YN, MIC4574 3.3YN

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