8182

LOW-DROPOUT,

3 V REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

MAXIMUM ALLOWABLE OUTPUT CURRENT with device mounted on 2.24" x 2.24"

(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.

Maximum Allowable Output Current in Milliamperes with V

dc (Duty Cycle)

T

A

100%

90%

80%

70%

60%

50%

40%

30%

20%

25

°C

150

150

150

150

150

150

150

150

150

50

°C

150

150

150

150

150

150

150

150

150

70

°C

145

150

150

150

150

150

150

150

150

85

°C

120

130

150

150

150

150

150

150

150

*I

Output current rating can be increased (to 150 mA maximum) by heat sinking or reducing the input voltage. Conditions that produce excessive

junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided.

Dwg. FS-012-2

BIAS

DRIVE

BANDGAP

REF.

ERROR

AMP

IN

ENABLE

OUT

IN

OUT

7

2

8

1

3

COMP

RESET

5

GND

4

6

1.23 V

–

+

For proper operation, terminals 1 and 8 should be externally connected together,

terminals 2 and 7 should be externally connected together.

FUNCTIONAL BLOCK DIAGRAM

W

Copyright © 1994 Allegro MicroSystems, Inc.