10A Adjustable voltage Regulator MSK 5012.

MSK5012 is a highly reliable adjustable voltage regulator.Whose output can be programmed using two resistors. The regulator has a very low dropout voltage(0.45v @10A  )due to the usage of MOSFET with very low Rds (ON) as the internal series pass element.The MS5012 has a high level of accuracy and ripple rejection is around 45dB. It is available in a 5 pin Sip package that is electrically isolated from the internal circuitry. This give us the freedom to fit the IC directly to the heat sink and this sort of direct heat sinking improves the thermal dissipation.


The output voltage of this circuit is adjustable from 1.3v to 36v DC.Resistors R1 and R2 are used for programming the output voltage.For all applications, value of R2 is fixed to 10K. The relationship between R1,R2 and output voltage Vout is according to the equation R1=R2(Vout/1.235)-1. C1 is a filter capacitor which is also a part of the gate drive circuit of the internal series pass MOSFET. Around three times the input voltage will appear across this capacitor and so the its voltage rating must be selected accordingly.C2 is the input filter capacitor while C3 is the output filter capacitor.

Circuit  diagram.

adjustable regulator
10A adjustable voltage regulator MSK5012


  • Input voltage 3v to 36v DC.
  • Output voltage range 13v to 36v DC.
  • Typical application of MSK5012 are high efficiency linear regulators, constant voltage/current regulators, system power supplies etc.
  • A heat sink with thermal resistance not more than 2.40 oC/W must be fitted to the MSK5012.
  • Resistance R2 is fixed at 10 K for all applications.
  • Quiescent current of MSK5012 is around 10mA.




  1. Hi Seetharaman,
    How can I insert a potentiometer to this circuit, and what value would it be?, Is it to be at R2?

  2. Bob Tower

    Where can I buy one of these MSK5012 adjustable voltage regulators to experiment with? I have not been able to find a source when googling the internet for this part number.

    • brian yarber

      hi bob. i am looking for one of these also.i deal with electronic parts everyday and i give up. you can make a similar circuit using a 555 ic
      as a PWM to drive the gate of a FET. would be alot simpler and fewer parts if we could find a msk5012. i wanted to control 12 heaters with it.

  3. Hi

    I require this circuit to regulate at 13.5 v @ >5amps

    Input at 15v

    Pls suggest for any changes in Circuit