CS8281 datasheet(3/6 Pages) CHERRY

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Definition of Terms

VIN

ENABLE

VOUT

System

Condition

60V

2.4V

Turn

Load

Dump

Low VIN

Line Noise, Etc.

VOUT2

Short

Circuit

Thermal

Shutdown

Turn

Off

14V

2.0V

0.8V

14V

26V

31V

2.4V

VOUT

Short

Circuit

Typical Circuit Waveform

PACKAGE LEAD #

LEAD SYMBOL

FUNCTION

Package Lead Description

5 Lead D2PAK

1VIN

Supply voltage to IC, usually direct from battery.

2VOUT1

5V regulated output which is activated by ENABLE input.

Gnd

Ground connection.

4VOUT2

Standby output 5V, 100mA capability; always on.

ENABLE

CMOS compatible input lead; switches VOUT1. When ENABLE is

high, VOUT1 is active.

Current Limit

Peak current that can be delivered to the output.

Dropout Voltage

The input-output voltage differential at which the circuit

ceases to regulate against further reduction in input volt-

age. Measured when the output voltage has dropped

100mV from the nominal value obtained at 14V input,

dropout voltage is dependent upon load current and junc-

tion temperature.

Input Output Differential

The voltage difference between the unregulated input volt-

age and the regulated output voltage for which the regula-

tor will operate.

Input Voltage

The DC voltage applied to the input terminals with respect

to ground.

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 condi-

tions after 1000 hours with maximum rated voltage and

junction temperature.

Quiescent Current

The part of the positive input current that does not con-

tribute to the positive load current. i.e., 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.

Short Circuit Current Limit

Peak current that can be delivered by the output when

forced to 0V.

Temperature Stability of VOUT

The percentage change in output voltage for a thermal varia-

tion from room temperature to either temperature extreme.

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