DC-DC Converter Calculators

Buck Converter Calculator

Inputs

Input Voltage: V

Output Voltage: V

Inductance: µH

Switching Freq: MHz

Vds(hi): V

Vds(lo): V

Outputs

iL(p-p): A

Duty Cycle: %

Ton: µs

Boost Converter Calculator

Inputs

Input Voltage: V

Output Voltage: V

Inductance: µH

Switching Freq: MHz

Vds(hi): V

Vds(lo): V

Load Current: A

Outputs

IL(avg): A

iL(p-p): A

Duty Cycle: %

Ton: µs

Inverting Buck-Boost Calculator

Inputs

Input Voltage: V

Output Voltage:

−

V

Output Current: A

Inductance: µH

Switching Freq: MHz

Outputs

IL(avg): A

ΔIL: A

Duty Cycle: %

Resistor Divider Calculator

Top Voltage: V

Middle Voltage: V

Bottom Voltage: V

Top Resistor: kΩ (0.00 mW)

Bottom Resistor: kΩ (0.00 mW)

Resistor Ratio: —

Current: 0.00 mA

Snap to closest standard values:

Standard Resistor Pairs:

Top R (kΩ)	Bottom R (kΩ)	Ratio	Ratio Error	Vmid (V)	Current (mA)	Current Error
Select a tolerance button to see standard resistor pairs

Standard Resistor Finder

Target Resistor Value: kΩ

Voltage (for Current): V

Find Standard Values (Tolerance):

Nearby Standard Resistor Values:

Standard Value (kΩ)	Error (%)	Current (mA)
Enter a target resistor and select a tolerance.

PCB Calculator

Copper Trace Resistance

Temperature: °C

Trace Length: mm

Trace Width: mm

Copper Thickness: µm

Resistance: mΩ

Via Resistance

Temperature: °C

Outer Diameter: mm

Wall Thickness: mm

Via Height: mm

Resistance: mΩ

Wafer Die Cost Calculator

Die Specifications

Die XY Area: mm²

Die Size X: mm

Die Size Y: mm

Saw Street: µm

Yield: %

Rds(on) x mm²: mΩ·mm²

Wafer Specifications

Wafer Size: mm

Edge Keepout: mm

Wafer Cost: $

Performance Metrics

Gross Die Per Wafer: dies

Yielded Die Per Wafer: dies

Yielded Cost Per Die: $

Die Area: mm²

Cents/mm² of Wafer: ¢/mm²

Power FET cents·mΩ: ¢·mΩ

Thermal Resistance Calculator

Calculates the thermal resistance of a rectangular prism along the Z-direction.

X Dimension: mm

Y Dimension: mm

Z Dimension: mm

Thermal Conductivity: W/(m·K)

Thermal Resistance: K/W

RLC Calculator

RC Time Constant & Cutoff Frequency

Calculates the time constant (τ) and cutoff frequency (f_c) of an RC circuit.

Resistance (R): × 10^ Ω

Capacitance (C): × 10^ F

Time Constant (τ): × 10^ s

Cutoff Frequency (f_c): × 10^ Hz

Reactance Calculator

Calculate capacitive reactance (X_c = 1/(2πfC)) or inductive reactance (X_L = 2πfL) or related variables. Provide the known values and click calculate for the unknown.

Frequency (f): × 10^ Hz

Capacitance (C): × 10^ F

Inductance (L): × 10^ H

Capacitive Reactance (X_c): × 10^ Ω

Inductive Reactance (X_L): × 10^ Ω

LC Resonance Calculator

Calculate the resonant frequency (f₀ = 1/(2π√(LC))) or related LC components. Provide two values to solve for the third.

Inductance (L): × 10^ H

Capacitance (C): × 10^ F

Resonant Frequency (f₀): × 10^ Hz

Coupled Inductor Ripple

Calculates the ripple current for discrete (`dIL_DL`) and coupled (`dIL_CL`) inductors in a multiphase buck converter topology, based on input/output voltages, inductance values, frequency, and phase count.

Input Voltage (V_IN): V

Output Voltage (V_OUT): V

Mutual Inductance (L_m):

Self Inductance (L):

Switching Frequency (F_S):

Number of Phases (N_ph):

Results

Duty Cycle (D): %

Figure of Merit (FOM):

Discrete Ripple (dIL_DL): A

Coupled Ripple (dIL_CL): A

Inductor Volume Estimator

Typical k₁ values (Isat at 20% inductance drop): 1.1 — Molded metal powder (Coilcraft XGL, Würth WE-MAPI), 0.3 — Ferrite drum core (Bourns SRN, Coilcraft MSS), 0.15 — Multilayer ceramic / thin-film (Murata DFE)

Estimates based on molded metal powder inductors. Accuracy ±30% for volume, ±25% for DCR. Ideal D = Vout/Vin (ignores switch drops). FET parameters auto-estimated from Vin/Iout — ±50% accuracy. Cap estimates assume 1% ripple, 50% load step / 3% droop, BW = fsw/5, with 2× ceramic derating. Best for directional fsw tradeoff guidance, not design sign-off.

Levels (N): Number of switch levels in a multi-level converter (e.g. flying capacitor, FCML). N=2 is a standard buck. Higher N divides Vin across (N-1) switch pairs, reducing per-switch voltage stress and required inductance. Switching frequency is the effective rate seen by the inductor — at N=3 each switch runs at half that rate.