CS8251ET7 View Datasheet(PDF) - Cherry semiconductor

Part Name

Description

View to exact match

CS8251ET7

10V/5V Low Dropout Dual Regulator with Independent Output Enables

Cherry semiconductor 

PACKAGE PIN #

7 Lead TO-220

1

2

3

4

5

6

7

Package Pin Description

PIN SYMBOL

FUNCTION

ENABLE1

ENABLE 2

VOUT2

Gnd

Sense

VCC

VOUT1

ENABLE control for the 10V, 1A output

ENABLE control for the 5V, 250mA output

5V ±5%, 250mA regulated output

Ground

Sense feedback for the primary 10V output

Supply voltage, usually from battery

10V ±5%, 1A regulated output

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 100mV from the nominal value obtained

at 14V input, dropout voltage is dependent upon load

current and junction temperature.

Current Limit: Peak current that can be delivered to the output.

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 tech-

niques 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 accelerat-

ed 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: 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 VOUT: The percentage change in out-

put voltage for a thermal variation from room temper-

ature to either temperature extreme.

Typical Circuit Waveform

VIN 14V

74V

31V

24V

5V

2.0V

ENABLE1,2

0.8V

VOUT1,2 0V

10V,5V

System

Condition

Turn

On

Load

Dump

10V,5V

5V,7.5V

10V,5V

0V

Low VIN

Line Noise, Etc.

VOUT

Short

Circuit

14V

10V,5V

0V

10V,5V

0V

Thermal

Shutdown

Turn

Off

3

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