2/3

ISSUED DATE :2004/12/06

REVISED DATE :

Pin Descriptions

Name

I/O

PIN#

FUNCTION

Vin

I

1

The input pin of regulator .Typically a large storage capacitor is connected from

this pin to ground to insure that the input voltage does not sag below the minimum

dropout voltage during the load transient response .This pin must always be 1.3V

higher than Vout in order for the device to regulate properly.

Gnd

I

2

A resistor divider from this pin to the Vout pin and ground sets the output voltage

(Ground only for fixed mode)

Vout

O

3

The output of the regulator, A minimum of 10uF capacitor must be connected from

this pin to ground to insure stability.

Absolute Maximum Ratings

Symbol

Parameter

Ratings

Unit

Vin

DC Supply Voltage

6.4 to 12

V

PD

Power Dissipation

Internally Limited

TST

Storage Temperature

-65 ~ + 150

:

TOP

Operating Junction Temperature Range

0 ~ + 150

:

Electrical Characteristics

PARAMETER

CONDITIONS

MIN

TYP

MAX UNIT

Output Voltage

Vout

Io=10mA,Tj=25 ,6.5V Vin 12V

:

4.900 5.000 5.100

V

Line Regulation

Io=10mA,6.5V<Vin<12V,Tj=25 :

-

-

0.2

%

Load Regulation

Vin=8V,0mA<Io<1A,TJ=25 (Note 1,2)

:

-

40

50

mV

Dropout Voltage

Io=1A,( Vout=0.1% Vout)

-

1.3

1.4

V

Current Limit

Vin-Vout=5V

1.1

-

-

A

Minimum Load Current

0

Tj 125

:

:

-

5

10

mA

Thermal Regulation

:

-

0.008

0.04 %/W

Ripple Rejection

-

60

70

dB

Temperature Stability

-

0.5

-

%

JA Thermal Resistance

Junction–to-Ambient(No

heat sink ;No air flow)

-

117

-

/w

:

JC Thermal Resistance

Junction-to-Case

Control Circuitry/Power Transistor

-

15

-

/w

:

Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation

are measured at a constant junction Temperature by low duty cycle pulse testing .Load regulation is measured at the

output lead =1/18” from the package.

Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W.Power dissipation is

determined by the difference between input and output and the output current .Guaranteed maximum power

dissipation will not be available over the full input/output range.

Note 3: Quiescent current is defined as the minimum output current required in maintaining regulation .At 12V input/output