LM2925 查看數據表（PDF） - HTC Korea
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LM2925 Datasheet PDF : 8 Pages
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Low Dropout Regulator with Delayed Reset
LM2925
DETAILED DESCRIPTION
Dropout Voltage:
Th input-output voltage differential at which the circuit ceases to regulate against further reduction in
input voltage. Measured when the outpu voltage has dropped 100mV from the nominal value obtained
at 14V in-put, 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 volt-age 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
condi-tions of low dissipation or by using pulse techniques such that the average chip temperature is
not significantly af-fected.
Load Regulation
The change inoutput voltage for a change in load current at constant chip temperature.
Long Term Stability
Output voltage stability under acceler-ated 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 inpu ripple, measured over aspecified
frequency range.
Quiescent Current
The 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 Stability of VO
The percentage change in ou-put voltage for a thermal variation from room temperature to either
temperature extreme.
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