Buck Converter Calculator
Calculate component values and operating parameters for your buck converter design
Input Parameters
Input Voltage (V
IN
) - Volts
Output Voltage (V
OUT
) - Volts
Output Current (I
OUT
) - Amps
Switching Frequency - kHz
Output Voltage Ripple - %
Inductor Current Ripple - %
High-Side MOSFET R
DS(on)
- mΩ
Low-Side MOSFET R
DS(on)
- mΩ
MOSFET R
θJC
(Junction-to-Case) - °C/W
Ambient Temperature - °C
Max Junction Temperature - °C
Design Results
Duty Cycle (D)
-
Inductance (L)
-
-
Output Capacitor (C
OUT
)
-
ESR should be low for minimal ripple
Input Capacitor (C
IN
)
-
Recommended minimum
MOSFET RMS Currents
-
Estimated Conduction Loss
-
MOSFET Specifications
-
Heatsink Requirements
-
Design Considerations
Typical inductor ripple current: 20-40% of output current
Higher switching frequency allows smaller L and C, but increases switching losses
Select MOSFETs with adequate voltage rating (1.5× V
IN
minimum) and low R
DS(on)
Use low-ESR capacitors (ceramic or polymer) for best ripple performance
Add input capacitance for high-frequency filtering and bulk energy storage
Consider dead-time control to prevent shoot-through in synchronous operation
Thermal management is critical - ensure adequate heatsinking for MOSFETs
Created By
M.Senthilkumar
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