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Buck / Boost Converter Calculator
Size the inductor, output capacitor, and peak switch current for a continuous-conduction buck or boost power stage from your input/output conditions and target ripple.
Buck requires Vin > Vout. Values clamp automatically if they cross.
Duty cycle
50.0%
D = Vout / Vin
Inductor ripple current
0.60 A
ΔIL = ripple ratio × IL,avg
Minimum inductor
6.67 µH
L = (Vin − Vout) × D / (fsw × ΔIL)
Minimum output capacitor
25.0 µF
Cout = ΔIL / (8 × fsw × ΔVout)
Peak inductor / switch current
2.30 A
IL,peak = IL,avg + ΔIL / 2
Switching period
3.33 µs
T = 1 / fsw
On-time / off-time
1.67 µs / 1.67 µs
Ton = D × T, Toff = (1 − D) × T
Buck: D = Vout / Vin
ΔI_L = ripple ratio × Iout
L = (Vin − Vout) × D / (fsw × ΔI_L)
Cout = ΔI_L / (8 × fsw × ΔVout)
I_L,peak = Iout + ΔI_L / 2