8187

LOW-DROPOUT,

3.3 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

100

115

125

145

150

150

150

150

150

50

°C

80

90

100

115

135

150

150

150

150

70

°C

65

70

80

90

110

130

150

150

150

85

°C

50

60

65

75

85

105

130

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.

FUNCTIONAL BLOCK DIAGRAM

Dwg. FS-012-4

BIAS

DRIVE

BANDGAP

REF.

ERROR

AMP

TAB

OUT

3

Copyright © 1995, 2000 Allegro MicroSystems, Inc.