Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change

divided by the total temperature range.

Note 2: Regulations are measured at constant junction temperature, using pulse testing with a low duty

cycle. Changes in output voltage due to heating effects are covered under the specification for thermal

regulation.

guaranteed by design to 0.2%. For LND2931-15 16V<= Vin <=26V.

Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2%

below its nominal value measured at 1V differential.

Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is

the sum of the ground pin current and output load current.

Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation,

excluding load or line regulation effects. Specifications are for a 50mA load pulse (1.25W pulse) for

T=10ms.

Note 8: Vshutdown

LND2931

BLOCK DIAGRAM AND TYPICAL APPLICATIONS

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

5V

L

OUTPUT

+

1.23 V

Reference

-

INPUT

GROUND

Unregulated DC

I

<= 100mA

+

See

Application

Hints

ERROR

AMPLIFIER

+

60k

182k

Figure 1: Fixed Regulator

+

Vout 1.2A->24A

1

Unregulated DC

From

CMOS

or

TTL

3.3

F

SHUTDOWN

ERROR

AMPLIFIER

7

L

60k

8

2,3,6,7

FEEDBACK

+

+

-

INPUT

5

GROUND

OUTPUT

1.23 V

Reference

+

I

<= 100mA

µ

0.01 F

µ

Figure 2:Adjustable Regulator

R2

+

R1