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Datasheet Microchip MIC9131YQS

Part NumberMIC9131YQS

The MIC9131 is a current-mode PWM controller that efficiently converts -48V telecom voltages to logic levels


  • Download » Datasheet, PDF, 933 Kb, Revision: 11-09-2015
    MIC9131 Data Sheet
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    MIC9131 Micrel, Inc. MIC9131
    High-Voltage, High-Speed Telecom
    DC-to-DC Controller General Description Features The MIC9131 is a current-mode PWM controller that efficiently
    converts –48V telecom voltages to logic levels. The MIC9131
    features a high voltage start-up circuit that allows the device to
    be connected to input voltages as high as 180V. The high input
    voltage capability protects the MIC9131 from line transients
    that are common in telecom systems. The start-up circuitry
    also saves valuable board space and simplifies designs by
    integrating several external components.
    The MIC9131 is capable of high speed operation. Typically
    the MIC9131 can control a sub-25ns pulse width on the gate
    out pin. Its internal oscillator can operate over 2.5MHz, with
    even higher frequencies available through synchronisation.
    The high speed operation of the MIC9131 is made safe by
    the very fast, 34ns response from current sense to output,
    minimizing power dissipation in a fault condition.
    The MIC9131 allows for the designs of high efficiency power
    supplies. It can achieve efficiencies over 90% at high output
    currents. Its low 1.3mA quiescent current allows high efficiency
    even at light loads.
    The MIC9131 has a maximum duty cycle of 75%. For designs
    requiring a maximum duty cycle of 50%, refer to the MIC9130. ...



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




Current Limit / Short Circuit ProtectionTrue
Duty Cycle Max0.75 %
Enable PinTrue
External Clock SyncTrue
Input UVLO Typ1.22 V
Internal Voltage BiasTrue
Iq Off0.1 µA
Maximum Input Voltage180 V
Maximum Output Voltage4.85 V
Minimum Input Voltage9 V
Minimum Output Voltage4.85 V
Operating FrequencyAdj. to 2.5MHz Hz
Operating Supply Current1 mA
Operating Temperature Range-40 to +125 °C
Soft StartTrue
Supported Outputs1
Supported TopologiesForward,Flyback
Typical Tolerance±3 %

Eco Plan


Moldel Line

Series: MIC9131 (4)

Manufacturer's Classification

  • Power Management > PWM Controllers > Flyback/Fwd/Push-Pull Products
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