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Datasheet Microchip MIC4721YMM

Part NumberMIC4721YMM

The MIC4721 is a high efficiency PWM buck (step-down) regulators that provides up to 1


  • Download » Datasheet PDF, 834 Kb, Revision: 11-05-2015
    MIC4721 Data Sheet
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    1.5A 2MHz Integrated Switch
    Buck Regulator General Description Features The Micrel MIC4721 is a high efficiency PWM buck (stepdown) regulators that provides up to 1.5A of output
    current. The MIC4721 operates at 2MHz and has
    proprietary internal compensation that allows a closed loop
    bandwidth of over 200KHz.
    The low on-resistance internal p-channel MOSFET of the
    MIC4721 allows efficiencies up to 94%, reduces external
    components count and eliminates the need for an
    expensive current sense resistor.
    The MIC4721 operates from 2.7V to 5.5V input and the
    output can be adjusted down to 1V. The devices can
    operate with a maximum duty cycle of 100% for use in lowdropout conditions.
    The MIC4721 is available in the 10-pin MSOP package
    with a junction operating range from –40°C to +125°C.
    Data sheets and support documentation can be found on
    Micrel’s web site at: 2.7 to 5.5V supply voltage
    2MHz PWM mode
    Output current to 1.5A
    Up to 94% efficiency
    100% maximum duty cycle
    Adjustable output voltage option down to 1V
    Ultra-fast transient response ...



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




# of Outputs1
Automotive RatedNo
Duty Cycle Max1 %
Input Voltage Range2.7 - 5.5 V
Light Load Efficiency ModeNo
Operating Temperature Range-40 to +125 °C
Output Current1500 mA) Max
Output Voltage Range1 - 5.5 V
Quiescent Current0.57 mA) type
Regulator TypeStep Down (Buck)
SHUTDOWN Current2 µA
Switching Frequency2000 kHz
Synchronous RectifierNo
Vfb1 V

Eco Plan


Moldel Line

Series: MIC4721 (2)

Manufacturer's Classification

  • Power Management > Switching Regulators > Step Down up to 6V
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