TM
D E S C R I P T I O N
The LX8584/84A/84B series ICs
are
low
dropout
three-terminal
positive regulators with a nominal 7A
output current. This product family is
ideally suited for Pentium® Processor
and
Power
PCTM
applications
requiring fast transient response. The
LX8584A is guaranteed 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,
LX8584B also offers ±1% maximum
voltage reference accuracy over
temperature. Fixed versions are also
available and are specified in the
Available Options table below.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
P R O D U C T H I G H L I G H T
T
A
HE
PPLICA TION OF THE
75 & 166 MH
P54C P
Z
3
2
V
V
5V
IN
OUT
LX8584A
1kΩ
ADJ
0.01µF
1kΩ
1
250pF
2
1
COL
3
8
220µF
V
V
V
+
+
+
REF
10V
Low ESR
LX1431
from
Sanyo
0.1µF
50V
SGND FGND
5
6
V
JP1
OUT
3.50
Short
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.
P A C K A G E O R D E R I N F O
P
T
(°C) Dropout Voltage
J
1.4V
0 to 125
1.2V
Note: xx refers to output voltage, please see table to right. Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8584-xxCP-TR)
Copyright © 1997
Rev. 1.3, 2005-11-11
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
®
7A Low Dropout Positive Regualtors
Current limit is trimmed above 7.1A
to ensure adequate output current and
controlled short-circuit current. On-chip
thermal limiting provides protection
against any combination of overload
that would create excessive junction
temperatures. The LX8584/84A series
products are available in both the
through-hole versions of the industry
standard 3-pin TO-220 and TO-247
power
packages.
The
LX1431
Programmable Reference utilzed in
conjunction with the LX8584 7A LDO
the
products offer precision output voltage
(see application below) and are ideal for
use in VRE applications.
http://www.microsemi.com
LX8584A & LX1431
IN A
U
3.3V C
ROCESSORS
SING
ACHE
V
7A
PLACE IN µP SOCKET CAVITY
O
(See Table Below)
3x
330µF, 6.3V
Low ESR
Oscon Type
from Sanyo
100µF x 6
10V
AVX TYPE
1k
TPS
µP
0.1%
Load
2.84kΩ
21k
0.1%
1%
1µF x 10
SMD
JP1
TYPICAL APPLICATION
120/166MHz, VRE, 3.3V Cache
Plastic TO-220
3 pin
RoHS Compliant
Transition DC: 0543
LX8584-xxCP
LX8584B-xxCP
LX8584A-xxCP
Microsemi
Integrated Products Division
LX8584x-xx
P
D
S
RODUCTION
ATA
HEET
K E Y F E A T U R E S
Three Terminal Adjustable or
Fixed Output
Guaranteed 1% Voltage
Accuracy over Temperature
(LX8584B)
Guaranteed < 1.2V Headroom
at 7A (LX8584A)
Guaranteed < 1.4V Headroom
at 7A (LX8584/84B)
Output Current of 7A
Fast Transient Response
1% Voltage Reference Initial
Accuracy
Output Short Circuit Protection
Built-in Thermal Shutdown
Evaluation Board Available:
Request LXE9001 Evaluation
Kit
A P P L I C A T I O N S
Pentium™ Processor Supplies
Power PC™ Supplies
Microprocessor Supplies
Low Voltage Logic Supplies
Post Regulator for Switching
Supply
D
V
.
ROPOUT
OLT AGE VS
O
C
UTPUT
URRENT
1.5
LX8584/84A
T
J
LX8584
1.0
LX8584A
0.5
0
1.75
3.5
5.25
Output Current - (A)
A V A I L A B L E O P T I O N S
Output
Part #
Voltage
LX8584/A/B-00
Adjustable
LX8584/A/B/-33
3.3V
Other voltage options may be available –
please contact factory for details.
= 125 °C
7
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