Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Total gate charge (nC)

Required number input.

Allowed supply droop (V)

Required number input.

Size the bootstrap capacitor with the documented rule C >= 10 x Qg / dV, returned in microfarads. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Bootstrap capacitance (uF)

The resulting bootstrap capacitance returned as a number.

• Capacitance, ESR, leakage, ripple rating, lifetime, and self-resonance vary with frequency, temperature, DC bias, aging, dielectric, package, and mounting. Nominal capacitance alone does not determine in-circuit impedance or reliability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Mixer P1dB Rule

  Estimate the 1 dB compression point of a mixer from its IP3 using the documented mixer-specific rule that P1dB sits 10.5 dB below the third-order intercept.

• P1dB Estimate

  Estimate the 1 dB compression point from IP3 using the documented rule P1dB(dBm) = IP3(dBm) - 9.6.

• Decoupling Cap Value

  Compute the decoupling capacitance C = I x dt / dV needed to supply a transient current for a droop time within an allowed droop voltage.