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Datasheet Microchip MIC2179-3.3YSM

Part NumberMIC2179-3.3YSM

The Micrel MIC2179 is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications


  • Download » Datasheet PDF, 362 Kb, Revision: 11-05-2015
    MIC2179 - 1.5A Synchronous Buck Regulator
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    Micrel, Inc. MIC2179 MIC2179
    1.5A Synchronous Buck Regulator General Description Features The Micrel MIC2179 is a 200kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications.
    The MIC2179 operates from a 4.5V to 16.5V input and features
    internal power MOSFETs that can supply up to 1.5A output
    current. It can operate with a maximum duty cycle of 100%
    for use in low-dropout conditions. It also features a shutdown
    mode that reduces quiescent current to less than 5ВµA.
    The MIC2179 achieves high efficiency over a wide output
    current range by operating in either PWM or skip mode. The
    operating mode is externally selected, typically by an intelligent system, which chooses the appropriate mode according
    to operating conditions, efficiency, and noise requirements.
    The switching frequency is preset to 200kHz and can be
    synchronized to an external clock signal of up to 300kHz.
    The MIC2179 uses current-mode control with internal current
    sensing. Current-mode control provides superior line regulation and makes the regulator control loop easy to compensate.
    The output is protected with pulse-by-pulse current limiting
    and thermal shutdown. Undervoltage lockout turns the output
    off when the input voltage is less than 4.5V.
    The MIC2179 and is packaged in a 20-lead SSOP package
    with an operating temperature range of –40°C to +85°C. 4.5V to 16.5V input voltage range Dual-mode operation for high efficiency (up to 96%) PWM mode for > 150mA load current Skip mode for <150mA load current 150mΩ internal power MOSFETs at 12V input 200kHz preset switching frequency Low quiescent current 1.0mA in PWM mode 600µA in skip mode < 5µA in shutdown mode Current-mode control Simplified loop compensation Superior line regulation 100% duty cycle for low dropout operation Current limit Thermal shutdown Undervoltage lockout Typical Application Applications High-efficiency, battery-powered supplies
    Buck (step-down) dc-to-dc converters
    Cellular telephones
    Laptop computers ...



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




# of Outputs1
Automotive RatedNo
Duty Cycle Max1 %
Input Voltage Range4.5 - 16.5 V
Light Load Efficiency ModeYes
Operating Temperature Range-40 to +85 °C
Output Current1500 mA) Max
Output Voltage Range1.245 - 16.5 V
Quiescent Current0.6 mA) type
Regulator TypeStep Down (Buck)
SHUTDOWN Current1 µA
Switching Frequency200 kHz
Synchronous RectifierYes
Vfb1.245 V

Eco Plan


Moldel Line

Series: MIC2179 (6)

Manufacturer's Classification

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

Other Names:

MIC21793.3YSM, MIC2179 3.3YSM

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