DESCRIPTION

KEY FEA TURES

s

s

s

s

s THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

s

s

s

s

s GUARANTEED

≤≤≤≤≤ 1V HEADROOM AT 5A

s

s

s

s

s OUTPUT CURRENT OF 5A

p FAST TRANSIENT RESPONSE

p 1% VOLTAGE REFERENCE INITIAL

ACCURACY

p OUTPUT SHORT-CIRCUIT PROTECTION

p BUILT-IN THERMAL SHUTDOWN

s EVALUATION BOARD AVAILABLE:

REQUEST LXE9001 EVALUATION KIT

The LX8554 series ICs are very low drop-

out three-terminal positive regulators with

5A rated output current. This product fam-

ing fast transient response. The LX8554

is guaranteed to have a dropout volt-

age under 1V at 5A load, making it ideal

to provide well-regulated outputs of 2.5V

to 3.6V with input supply as low as 4.75V.

Fixed versions are also available and are

specified in the Available Options table

below.

Current limit is trimmed above 5.1A to

ensure adequate output current and con-

trolled short-circuit current. On-chip ther-

mal limiting provides protection against

any combination of overload that would

create excessive junction temperatures.

The LX8554 series products are avail-

able in both through-hole and surface-

mount versions of industry standard 3-pin

TO-220 / TO-263 power packages.

The LX8554 family of products are ideal

for use in multiple processor applications

where output voltage is jumper selected.

The LX8554 ICs offer precision output as

well as low supply operation (see appli-

cation below). For higher current appli-

cations see the LX8584 series of products.

APPLICA TIONS

s PENTIUM PROCESSOR SUPPLIES

s POWER PC SUPPLIES

s MICROPROCESSOR SUPPLIES

s LOW VOLTAGE LOGIC SUPPLIES

s BATTERY POWERED CIRCUIT

s POST REGULATOR FOR SWITCHING SUPPLY

OF

Copyright © 1997

Rev. 1.1

1/97

FOR FUR THER INFORMA TION CALL (714) 898-8121

LX8554-xx

1

P ACKAGE ORDER INFORMA TION

T

0 to 125

LX8554-xxCP

LX8554-xxCDD

Plastic TO-220

3-pin

P

Plastic T0-263

3-pin

DD

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX8554-00CDDT)

"xx" refers to output voltage, please see table above.

PRODUCT HIGHLIGHT

JP1

JP2

OUTPUT VOLTAGE

Open

Open

3.6V

Open

Short

3.45V

Short

Short

3.3V

LX8554

OUT

ADJ

R1

121

W

1%

1500µF, 6.3V

Sanyo MVGX Series

3x 1500µF

6.3V

Sanyo

MVGX Series

V

4.75

IN

JP1

JP2

200

W

1%

13

W

1%

14.7

W

1%

V

O

(See Table Below)

V

REF

V

1 +

+ I

R2

R1

R2

LX8554-00

Adjustable

LX8554-33

3.3V

Part #

Output

Voltage

Other voltage options may be available —

Please contact factory for details.