8181 datasheet(2/8 Pages) ALLEGRO

2 / 8 page

8181

LOW-DROPOUT,

5 V REGULATOR

115 Northeast Cutoff, Box 15036

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

Maximum Allowable Output Current in Milliamperes with VI = 10 V, TJ = 150°C*

dc (Duty Cycle)

100%

90%

80%

70%

60%

50%

40%

30%

20%

°C

370

415

465

530

620

745

930

1000

°C

295

330

370

425

495

595

745

995

1000

°C

235

265

295

340

395

475

595

795

1000

°C

190

215

240

275

320

385

485

645

970

*IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(5 • 67 • dc)

Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R-JA = R-JT =

°C/W. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated

but should be avoided.

FUNCTIONAL BLOCK DIAGRAM

12-13

Dwg. FS-012

BIAS

DRIVE

BANDGAP

REF.

ERROR

AMP

4-5

ENABLE

OUT

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.

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