LM2930

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SNVS745D – APRIL 1998 – REVISED APRIL 2013

Definition of Terms

Dropout Voltage: The input-output voltage differential at which the circuit ceases to regulate against further

reduction in input voltage. Measured when the output voltage has dropped 100 mV from the nominal value

obtained at 14V input, dropout voltage is dependent upon load current and junction temperature.

Input Voltage: The DC voltage applied to the input terminals with respect to ground.

Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated

output voltage for which the regulator will operate.

Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made

under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not

significantly affected.

Load Regulation: The change in output voltage for a change in load current at constant chip temperature.

Long Term Stability: Output voltage stability under accelerated life-test conditions after 1000 hours with

maximum rated voltage and junction temperature.

Output Noise Voltage: The rms AC voltage at the output, with constant load and no input ripple, measured over

a specified frequency range.

Quiescent Current: That part of the positive input current that does not contribute to the positive load current.

The regulator ground lead current.

Ripple Rejection: The ratio of the peak-to-peak input ripple voltage to the peak-to-peak output ripple voltage.

temperature to either temperature extreme.

Maximum Power Dissipation (TO-220)

(1)

Thermal resistance without a heat sink for junction to case temperature is 3°C/W and for case to ambient temperature is 50°C/W for the

TO-220, 73°C/W for the SFM. If the SFM package is used, the thermal resistance can be reduced by increasing the P.C. board copper

area thermally connected to the package. Using 0.5 square inches of copper area,

is 37°C/W; and with 1.6 or more square inches of copper area,

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