LX8584-33 MICROSEMI [Microsemi Corporation], LX8584-33 Datasheet

LX8584-33

Manufacturer Part Number

LX8584-33

Description

7 A LOW DROPOUT POSITIVE REGULATORS

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

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Rev. 1.2

H E

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

out three-terminal positive regulators with a

nominal 7A output current. This product

family is ideally suited for Pentium

sor and Power PC

fast transient response. The LX8584A is guar-

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.

4/97

220µF

10V

Low ESR

from

Sanyo

N F I N I T E

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

0 to 125

(°C)

low inductance in order to achieve good transient response.

LX8584A

75 & 166MH

3.50

3.38

0.1µF

50V

ADJ

OUT

P A C K A G E O R D E R I N F O R M A T I O N

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

OUT

250pF

applications requiring

PPLICATION OF THE

Dropout

SGND

Voltage

O W E R

Open

1.4V

1.2V

Short

LX1431

P R O D U C T H I G H L I G H T

JP1

COL

FGND

F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

P54C P

D E S C R I P T I O N

REF

O F

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

Proces-

0.01µF

11861 W

2.84k

LX8584A-xxCP

LX8584B-xxCP

0.1%

120/166MHz, VRE, 3.3V Cache

Plastic TO-220

3-pin

LX8584-xxCP

ROCESSORS

N N O V A T I O N

LX8584A & LX1431

TYPICAL APPLICATION

0.1%

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.

able in both the through-hole versions of

the industry standard 3-pin TO-220 and

TO-247 power packages.

conjunction with the LX8584 7A LDO prod-

ucts offer precision output voltage (see ap-

plication below) and are ideal for use in VRE

applications.

330µF, 6.3V

ESTERN

Oscon Type

from Sanyo

Current limit is trimmed above 7.1A to

The LX8584/84A series products are avail-

The LX1431 Programmable Reference in

JP1

Low ESR

21k

(See Table Below)

SING

VENUE

3.3V C

LX8584A-xxCV

LX8584B-xxCV

Plastic TO-247

3-terminal

LX8584-xxCV

, G

PLACE IN µP SOCKET CAVITY

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

IN A

ARDEN

ACHE

1µF x 10

SMD

100µF x 6

AVX TYPE

7 A L

10V

TPS

ROVE

O W

R O D U C T I O N

, CA. 92841

Load

µP

R O P O U T

VA I L A B L E

Other voltage options may be available —

Part #

LX8584/A/B-00

LX8584/A/B-33

1.5

1.0

0.5

Please contact factory for details.

p FAST TRANSIENT RESPONSE

p 1% VOLTAGE REFERENCE INITIAL

p OUTPUT SHORT CIRCUIT PROTECTION

p BUILT-IN THERMAL SHUTDOWN

THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

GUARANTEED 1% VOLTAGE ACCURACY

OVER TEMPERATURE (LX8584B)

GUARANTEED

(LX8584A)

GUARANTEED

(LX8584/84B)

OUTPUT CURRENT OF 7A

ACCURACY

EVALUATION BOARD AVAILABLE:

REQUEST LXE9001 EVALUATION KIT

PENTIUM PROCESSOR SUPPLIES

POWER PC SUPPLIES

MICROPROCESSOR SUPPLIES

LOW VOLTAGE LOGIC SUPPLIES

POST REGULATOR FOR SWITCHING SUPPLY

LX8584/84A

O S I T I V E

K E Y F E A T U R E S

A P P L I C A T I O N S

1.75

R O P O U T

P T I O N S P E R

A T A

Output Current - (A)

U T P U T

Output Voltage

1.2V HEADROOM AT 7A

1.4V HEADROOM AT 7A

LIN D

3.5

Adjustable

E G U L A T O R S

O L TA G E V S

H E E T

U R R E N T

3.3V

LX8584

O C

A R T

5.25

#: 8584

LX8584A

= 125°C

Related parts for LX8584-33

LX8584-33 Summary of contents

Page 1

... The LX8584/84A/84B series ICs are low drop- out three-terminal positive regulators with a nominal 7A output current. This product family is ideally suited for Pentium ® Proces- TM sor and Power PC applications requiring fast transient response ...

Page 2

... LX8584-xx/8584A-xx/8584B- Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Maximum Output Current ............................................................................................. 8A Operating Junction Temperature Plastic (P Package) ................................................................................................ 150° ...

Page 3

... LX8584/84B LX8584/84B Minimum Load Current Maximum Output Current Temperature Stability Long Term Stability RMS Output Noise (% OUT LX8584-33/84A-33/84B-33 (3.3V Fixed) Parameter Symbol Output Voltage LX8584/84A-33 LX8584B-33 Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Ripple Rejection (Note 3) Quiescent Current ...

Page 4

... LX8584-xx/8584A-xx/8584B-xx The LX8584/84A/84B series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of a voltage regulator: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165° ...

Page 5

... Peff P where: R When the circuit is connected as shown in Figure 3, the parasitic resistance appears as its actual value, rather than the higher R LX8584/84A/84B FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION LX8584/84A/84B OUT IN V OUT ADJ V R1 REF I ADJ 50µA R2 ...

Page 6

... DROPOUT (MAX) for the installed regulator. THERMAL CONSIDERATIONS The LX8584/84A/84B regulators have internal power and thermal limiting circuitry designed to protect each device under overload conditions. For continuous normal load conditions, however, maximum junction temperature ratings must not be exceeded important to give careful consideration to all sources of thermal resistance from junction to ambient ...

Page 7

... FIGURE 6 — 5V REGULATOR WITH SHUTDOWN LX8584/84A/84B-33 OUT IN IN GND FIGURE 7 — FIXED 3.3V OUTPUT REGULATOR ) DROPOUT (MAX) Pentium is a registered trademark of Intel Corporation. Power trademark of International Business Machines Corporation LX8584/84A/84B OUT IN ADJ R1 121 C1* 10µ 1.25V 1 + OUT ...

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