NCP605, NCP606

http://onsemi.com

9

DEFINITIONS

General

All measurements are performed using short pulse low

duty cycle techniques to maintain junction temperature as

close as possible to ambient temperature.

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 techniques such that the

average junction temperature is not significantly affected.

Load Regulation

The change in output voltage for a change in output load

current at a constant temperature.

Dropout Voltage

The input to output differential at which the regulator

output no longer maintains regulation against further

reductions in input voltage. Measured when the output drops

100 mV below its nominal value. The junction temperature,

load current, and minimum input supply requirements affect

the dropout level.

Ground and Disable Currents

Ground Current is the current that flows through the

ground pin when the regulator operates without a load on its

etc. It is actually the difference between the input current

(measured through the LDO input pin) and the output load

current. If the regulator has an input pin that reduces its

internal bias and shuts off the output (enable/disable

Current Limit and Short Circuit Current Limit

Current Limit is value of output current by which output

voltage drops by 10% with respect to its nominal value.

Short Circuit Current Limit is output current value

measured with output of the regulator shorted to ground.

PSRR

Power Supply Rejection Ratio is defined as ratio of output

voltage and input voltage ripple. It is measured in decibels

(dB).

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

Turn−on and Turn−off Times

Turn−on Time is time difference measured during

power−up of the device from the moment when input

voltage reaches 90% of its operating value to the moment

when output voltage reaches 90% of its nominal value at

specific output current or resistive load.

Turn−off Time is time difference measured during

power−down of the device from the moment when input

voltage drops to 10% of its operating value to the moment

when output voltage drops to 10% of its nominal value at

specific output current or resistive load.

Enable and Disable Times

Enable Time is time difference measured during

power−up of the device from the moment when enable

voltage reaches 90% of input voltage operating value to the

moment when output voltage reaches 90% of its nominal

value at specific output current or resistive load.

Disable Time is time difference measured during

power−down of the device from the moment when enable

voltage drops to 10% of input voltage operating value to the

moment when output voltage drops to 10% of its nominal

value at specific output current or resistive load.

Line Transient Response

Typical output voltage overshoot and undershoot response

when the input voltage is excited with a given slope.

Load Transient Response

Typical output voltage overshoot and undershoot

response when the output current is excited with a given

slope between no−load and full−load conditions.

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 175

°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.