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 a 12V 3A power supply before we choose a linear circuit. But now some projects we use switching regulators. Why? It is more effective. No heat and no power down. It can drive a 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.

Recommended: 7805 regulator datasheet & pinout

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

Parts will you need

IC1LM2576-1212V 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
12V 5A power supply Regulator with LM2678-12
MJ2955 Switching Power Supply 12V 10Amp
12 Volt Low Voltage Dropout Precision Regulator with LM324
12V Switching Car PSU by UC3843 + 74LS02

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

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