Enter the Potential Barrier Height, Width, Particle Energy, and Mass into the Quantum Tunneling Probability Calculator to get the Tunneling Probability, Transmission Coefficient, Decay Constant, and Wave Function behavior.
Minimum Input Voltage
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Voltage Headroom
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Power Dissipation
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Efficiency
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Junction Temperature
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If the input voltage falls below the minimum required voltage (Vout + Vdropout), the LDO will go out of regulation. The output voltage will drop and become unstable, potentially causing your circuit to malfunction.
Dropout voltage is primarily determined by the internal resistance of the LDO's pass element. As load current increases, the voltage drop across this internal resistance increases according to Ohm's law (V = I × R).
Yes, but consider the power dissipation. With a large voltage drop, the LDO will dissipate significant power as heat (P = (Vin - Vout) × Iload). You'll need adequate heat sinking and thermal management.
Quiescent current is the current consumed by the LDO itself for its internal operation. It affects efficiency, especially at light loads, and is important for battery-powered applications where every microamp counts.
Output capacitors provide stability and improve transient response. Different LDO architectures have specific ESR (Equivalent Series Resistance) requirements for their output capacitors to maintain stability and prevent oscillation.
Calculate the junction temperature using: Tj = Ta + (Pd × θJA). If Tj exceeds the maximum junction temperature rating (typically 125-150°C), you need better thermal management like a heatsink or copper pour.
Dropout voltage is the minimum voltage difference required across the LDO for regulation. Headroom is the actual voltage difference you have (Vin - Vout). Headroom should be greater than dropout for stable operation.
LDO efficiency (Vout/Vin × 100%) determines how much input power is wasted as heat. Low efficiency means more power dissipation, higher temperatures, and shorter battery life in portable applications.