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Microsemi Corporation - 7 A LOW DROPOUT POSITIVE REGULATORS

Numéro de référence LX8584A-00CV
Description 7 A LOW DROPOUT POSITIVE REGULATORS
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX8584A-00CV fiche technique
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 8584
LX8584-xx/8584A-xx/8584B-xx
7A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
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-
sor and Power PCTM applications requiring
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.
PRODUCT HIGHLIGHT
THE APPLICATION OF THE LX8584A & LX1431 IN A
75 & 166MHZ P54C PROCESSORS USING 3.3V CACHE
32
5V VIN VOUT
LX8584A
1kW
VO 7A
(See Table Below)
3x
330µF, 6.3V
Low ESR
PLACE IN µP SOCKET CAVITY
ADJ
1
250pF
0.01µF
1kW
Oscon Type
from Sanyo
100µF x 6
10V
220µF
10V
2
3 V+
1
COL REF 8
1k
0.1%
AVX TYPE
TPS
µP
Load
Low ESR
from
Sanyo
0.1µF
50V
LX1431
SGND FGND
2.84kW
0.1%
21k
1%
JP1
1µF x 10
SMD
56
KEY FEATURES
s THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s GUARANTEED 1% VOLTAGE ACCURACY
OVER TEMPERATURE (LX8584B)
s GUARANTEED 1.2V HEADROOM AT 7A
(LX8584A)
s GUARANTEED 1.4V HEADROOM AT 7A
(LX8584/84B)
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
A P P L I C AT I O N S
s PENTIUM PROCESSOR SUPPLIES
s POWER PC SUPPLIES
s MICROPROCESSOR SUPPLIES
s LOW VOLTAGE LOGIC SUPPLIES
s POST REGULATOR FOR SWITCHING SUPPLY
D ROPOUT VOLTAGE V S.
OUTPUT CURRENT
1.5
LX8584/84A
TJ = 125°C
LX8584
1.0
LX8584A
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
Thick traces represent high current traces which must be low resistance /
low inductance in order to achieve good transient response.
0.5
0
1.75 3.5 5.25
Output Current - (A)
7
PACKAGE ORDER INFORMATION
TA (°C)
Dropout
Voltage
P
Plastic TO-220
3-pin
V
Plastic TO-247
3-terminal
0 to 125
1.4V
LX8584-xxCP
LX8584B-xxCP
LX8584-xxCV
LX8584B-xxCV
1.2V
LX8584A-xxCP
LX8584A-xxCV
"xx" refers to output voltage, please see table above.
A VA I L A B L E O P T I O N S P E R P A R T #
Part #
Output Voltage
LX8584/A/B-00
Adjustable
LX8584/A/B-33
3.3V
Other voltage options may be available —
Please contact factory for details.
Copyright © 1997
Rev. 1.2 4/97
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1

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