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Tools ›MC34063A Calculator

MC34063A DC-DC Buck/Boost Calculator

The MC34063A is a popular, low-cost switching regulator IC. Use this tool to calculate component values for step-up (boost) and step-down (buck) configurations.

Converter Mode

Step-Up (Boost) Step-Down (Buck)

Min Input Voltage Vin (V)

Output Voltage Vout (V)

Max Output Current Iout (A)

Switching Frequency f (kHz) Recommended range: 20 kHz to 100 kHz

Output Ripple Voltage Vripple (Vpp)

Key Formulas

Feedback equation:

Vout = 1.25 × (1 + R2 / R1)

Current limit sense:

Rsc = 0.3 / Ipeak

Design Notes

The peak current limit is typically 1.5A. For higher load currents, use an external power NPN transistor or P-channel MOSFET driver.
Select inductors with a saturation current rating higher than the calculated Ipeak value.
CT sets the frequency. Keep CT above 100 pF for stable startup.

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