NCP500

http://onsemi.com

13

DEFINITIONS

Load Regulation

The change in output voltage for a change in output load

current at a constant temperature.

Dropout Voltage

The input/output differential at which the regulator output

no longer maintains regulation against further reductions in

input voltage. Measured when the output drops 2% below its

nominal. The junction temperature, load current, and

minimum input supply requirements affect the dropout level.

Output Noise Voltage

This is the integrated value of the output noise over a

specified frequency range. Input voltage and output load

current are kept constant during the measurement. Results

are expressed in

Quiescent Current

The current which flows through the ground pin when the

regulator operates without a load on its output: internal IC

operation, bias, etc. When the LDO becomes loaded, this

term is called the Ground current. It is actually the difference

between the input current (measured through the LDO input

pin) and the output current.

Line Regulation

The change in output voltage for a change in input voltage.

The measurement is made under conditions of low

dissipation or by using pulse technique such that the average

chip temperature is not significantly affected.

Line Transient Response

Typical over and undershoot response when input voltage

is excited with a given slope.

Thermal Protection

Internal thermal shutdown circuitry is provided to protect

the integrated circuit in the event that the maximum junction

temperature is exceeded. When activated at typically 160

°C,

the regulator turns off. This feature is provided to prevent

failures from accidental overheating.

Maximum Package Power Dissipation

The power dissipation level at which the junction

temperature reaches its maximum operating value, i.e.

125

°C.