DESCRIPTION

KEY FEA TURES

s

s

s

s

s THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

s

s

s

s

s GUARANTEED 1% VOLTAGE ACCURACY

OVER TEMPERATURE (LX8584B)

s

s

s

s

s GUARANTEED

≤≤≤≤≤ 1.2V HEADROOM AT 7A

(LX8584A)

s

s

s

s

s GUARANTEED

≤≤≤≤≤ 1.4V HEADROOM AT 7A

(LX8584/84B)

s

s

s

s

s OUTPUT CURRENT OF 7A

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 LX8584/84A/84B series ICs are low drop-

out three-terminal positive regulators with a

nominal 7A output current. This product

fast transient response. The LX8584A isguar-

anteed to have < 1.2V at 7A and the

LX8584/84B < 1.4V at 7A dropout voltage,

making them ideal to provide well regulated

outputs of 2.5V to 3.6V using a 5V input

supply. In addition, the LX8584B also of-

fers ±1% maximum voltage reference ac-

curacy over temperature. Fixed versions

are also available and are specified in the

Available Options table below.

Current limit is trimmed above 7.1A 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 LX8584/84A series products are avail-

able in both the through-hole versions of

the industry standard 3-pin TO-220 and

TO-247 power packages.

The LX1431 Programmable Reference in

conjunction with the LX8584 7A LDO prod-

ucts offer precision output voltage (see ap-

plication below) and are ideal for use in VRE

applications.

APPLICA TIONS

s PENTIUM PROCESSOR SUPPLIES

s POWER PC SUPPLIES

s MICROPROCESSOR SUPPLIES

s LOW VOLTAGE LOGIC SUPPLIES

s POST REGULATOR FOR SWITCHING SUPPLY

OF

Copyright © 1997

Rev. 1.2

4/97

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

LX8584-xx/8584A-xx/8584B-xx

1

PRODUCT HIGHLIGHT

Thick traces represent high current traces which must be low resistance /

low inductance in order to achieve good transient response.

Output Current - (A)

1.0

0

1.75

3.5

5.25

0.5

1.5

7

T

LX8584/84A

LX8584

LX8584A

µP

Load

100µF x 6

10V

AVX TYPE

TPS

1µF x 10

SMD

1k

0.1%

2.84k

W

0.1%

COL

SGND FGND

REF

LX1431

V

IN

V

OUT

ADJ

1k

W

1k

W

0.01µF

3x

330µF, 6.3V

Low ESR

Oscon Type

from Sanyo

2

3

1

6

5

8

1

3

0.1µF

50V

220µF

10V

Low ESR

from

Sanyo

5V

PLACE IN µP SOCKET CAVITY

LX8584A

V

O

7A

(See Table Below)

2

250pF

21k

1%

JP1

P ACKAGE ORDER INFORMA TION

T

Plastic TO-220

3-pin

P

Plastic TO-247

3-terminal

V

1.4V

LX8584-xxCP

LX8584-xxCV

0 to 125

LX8584B-xxCP

LX8584B-xxCV

1.2V

LX8584A-xxCP

LX8584A-xxCV

Dropout

Voltage

V

OUT

JP1

TYPICAL APPLICATION

3.50

Short

120/166MHz, VRE, 3.3V Cache

3.38

Open

75/90/100/133MHz, STND, 3.3V Cache

LX8584/A/B-00

Adjustable

LX8584/A/B-33

3.3V

Part #

Output Voltage

Other voltage options may be available —

Please contact factory for details.

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