12V 3A Switching Regulator circuit using LM2576-12


Here is a 12V 3A Switching Regulator circuit,  or Step down DC Converter  voltage. Use IC LM2576-12 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator. Input DC Voltage 40Vmax and 16Vmin 3A.

How this circuit works
When we need to use 12V 3A power supply before we choose a linear circuit. But now some projects we use switching regulator. Why? It is more effective. No heat and no power down. It can drive 3A load with very good load regulation.

The schematic diagram of 12V 3A switching power supply using LM2576-12

The output fixed voltage of 3.3V, 5V, 12V (we use it now), 15V and an adjustable. and use a min external components.So We can substitute the popular three-terminal linear regulators IC-LM350T with the LM2576 series.

Simple Features

  1. 3.3V, 5V, 12V, 15V fix regulator version
  2. Adjustable version output voltage range 1.23V to 37V (57V for HV version) ±4% max overline and load conditions
  3. Full 3A output current
  4. Input voltage range 40V up to 60V (For HV Version)
  5. Use only 4 external components
  6. 52 kHz fixed frequency internal oscillator
  7. High efficiency
  8. Thermal shutdown and current limit protection


  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (Buck-Boost)

Read more data sheet of LM2576

But some time,we cannot make the 12V 3A Switching Regulator circuit, because the LM2576 may be expensive than LM7805 and transistor boost up current and some times you may cannot find easily it.
3A adjustable voltage regulator using LM317-2N3055
12V, 10A Regulated Power Supply Using IC 723+2N3055

You can buy LM2576 here:

See: More Power Supply Circuits

Parts will you need


IC1 LM2576-12 12V 3A SIMPLE SWITCHER 3A Step-Down Voltage Regulator
 Cin  100uF  Electrolytic Capacitor
 Cout  1000uF 25V  Electrolytic Capacitor
 D1  1N5822  Schottky Barrier Rectifier, 3.0 A, 40 V
 L1  100uH  Inductor coil


Related Links
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MJ2955 Switching Power Supply 12V 10Amp
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12V Switching Car PSU by UC3843 + 74LS02

What’s more? You can look other power supply circuits: Click Here

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