LIN D
O C
#:
8584
LX8584-xx/8584A-xx/8584B-xx
7A L
OW
D
ROPOUT
P
OSITIVE
R
E G U L AT O R S
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
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
廬
Proces-
sor and Power PC
TM
applications requiring
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 鹵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.
K E Y F E AT U R E S
s
THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s
GUARANTEED 1% VOLTAGE ACCURACY
OVER TEMPERATURE (LX8584B)
s
GUARANTEED
鈮?/div>
1.2V HEADROOM AT 7A
(LX8584A)
s
GUARANTEED
鈮?/div>
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
PRODUCT HIGHLIGHT
A P P L I C AT I O N S
s
s
s
s
s
PENTIUM PROCESSOR SUPPLIES
POWER PC SUPPLIES
MICROPROCESSOR SUPPLIES
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SWITCHING SUPPLY
T
HE
A
PPLICATION OF THE
LX8584A & LX1431
IN A
75 & 166MH
Z
P54C P
ROCESSORS
U
SING
3.3V C
ACHE
5V
3
V
IN
V
OUT
2
V
O
7A
(See Table Below)
PLACE IN 碌P SOCKET CAVITY
LX8584A
1kW
ADJ
1
250pF
2
220碌F
10V
Low ESR
from
Sanyo
0.1碌F
50V
3
V
+
1
COL
REF
8
2.84kW
0.1%
1kW
0.01碌F
3x
330碌F, 6.3V
Low ESR
Oscon Type
from Sanyo
100碌F x 6
10V
AVX TYPE
TPS
D
R O P O U T
V
O L TA G E V S
.
O
UTPUT
C
URRENT
碌P
Load
1.5
1k
0.1%
LX8584/84A
T
J
= 125擄C
LX1431
SGND
5
FGND
6
21k
1%
JP1
1碌F x 10
SMD
Input / Output Differential - (V)
LX8584
1.0
LX8584A
V
OUT
3.50
3.38
JP1
Short
Open
TYPICAL APPLICATION
120/166MHz, VRE, 3.3V Cache
75/90/100/133MHz, STND, 3.3V Cache
0.5
Thick traces represent high current traces which must be low resistance /
low inductance in order to achieve good transient response.
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(擄C)
Dropout
Voltage
1.4V
1.2V
0
1.75
3.5
5.25
7
Output Current - (A)
A
VA I L A B L E
O
P T I O N S
Part #
LX8584/A/B-00
LX8584/A/B-33
PER
P
ART
#
P
Plastic TO-220
3-pin
LX8584-xxCP
LX8584B-xxCP
LX8584A-xxCP
V
Plastic TO-247
3-terminal
LX8584-xxCV
LX8584B-xxCV
LX8584A-xxCV
Output Voltage
Adjustable
3.3V
0 to 125
Other voltage options may be available 鈥?/div>
Please contact factory for details.
"xx" refers to output voltage, please see table above.
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright 漏 1997
Rev. 1.2 4/97
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
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