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Datasheet Microchip LM2574-3.3YN

Part NumberLM2574-3.3YN

The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators


  • Download » Datasheet PDF, 191 Kb, Revision: 11-05-2015
    LM2574 - 52 kHz Simple 0.5A Buck Regulator
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    LM2574 Micrel, Inc. LM2574
    52kHz Simple 0.5A Buck Regulator General Description Features The LM2574 family is a series of easy to use п¬Ѓxed and adjustable switching voltage regulators. The LM2574 contains
    all of the active circuitry necessary to construct a stepdown
    (buck) switching regulator and requires a minimum of external
    The LM2574 is available in 3.3V and 5V п¬Ѓxed output versions, or an adjustable version with an output voltage range
    of 1.23V to 37V. Output voltage is guaranteed to В±4% for
    specified input and load conditions.
    The LM2574 can supply 0.5A while maintaining excellent
    line and load regulation. The output switch includes cycleby-cycle current limiting, as well as thermal shutdown for full
    protection under fault conditions.
    An external shutdown connection selects operating or standby
    modes. Standby current is less than 200ВµA.
    Heat sinks are generally unnecessary due the regulator’s
    high efficiency. Adequate heat transfer is usually provided
    by soldering all package pins to a printed circuit board.
    The LM2574 includes internal frequency compensation and
    an internal 52kHz п¬Ѓxed frequency oscillator guaranteed to
    В±10% of the frequency.
    Circuits constructed around the LM2574 use a standard
    series of inductors which are available from several different
    All support documentation can be found on Micrel’s web site ...



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




# of Outputs1
Automotive RatedNo
Duty Cycle Max0.98 %
Input Voltage Range4 - 40 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 Frequency52 kHz
Synchronous RectifierNo
Vfb1.23 V

Eco Plan


Moldel Line

Series: LM2574 (4)

Manufacturer's Classification

  • Power Management > Switching Regulators > Step Down up to 75V

Other Names:

LM25743.3YN, LM2574 3.3YN

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