LIN D
O C
#:
8585
LX8585-xx/8585A-xx
4 . 6 A L
OW
D
R O P O U T
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 LX8585/85A Series ICs are low drop-
out three-terminal regulators with a mini-
mum of 4.6A output current. Pentium
廬
Processor and Power PC
TM
applications
requiring fast transient response are ide-
ally suited for this product family. The
LX8585A is
guaranteed to have < 1.2V
at 4.6A,
while the LX8585 are specified
for 1.4V, making them ideal to provide
well regulated outputs of 2.5V to 3.6V
using a 5V input supply. Fixed versions
are also available and specified in the
Available Options table below.
Current limit is trimmed above 4.6A to
ensure adequate output current and con-
trolled short-circuit current. On-chip
thermal limiting provides protection
against any possible overload that would
create excessive junction temperatures.
The LX8585/85A family is available in
both through-hole and surface-mount
versions of the industry standard 3-pin
TO-220 / TO-263 power packages.
The LX1431 Programmable Reference
and LX8585A Series products offer pre-
cision output voltage and are ideal for
use in VRE applications (see application
below). For higher current applications,
see the LX8584 data sheet.
K E Y F E AT U R E S
s
THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s
GUARANTEED < 1.2V HEADROOM AT 4.6A
(LX8585A)
s
GUARANTEED < 1.4V HEADROOM AT 4.6A
(LX8585)
s
GUARANTEED < 1.3V HEADROOM AT 3A
s
OUTPUT CURRENT OF 4.6A MINIMUM
p
FAST TRANSIENT RESPONSE
p
1% VOLTAGE REFERENCE INITIAL
ACCURACY
p
OUTPUT SHORT CIRCUIT PROTECTION
p
BUILT-IN THERMAL SHUTDOWN
A P P L I C AT I O N S
s
s
s
s
s
s
s
s
PENTIUM PROCESSOR SUPPLIES
POWER PC SUPPLIES
MICROPROCESSOR SUPPLIES
LOW VOLTAGE LOGIC SUPPLIES
BATTERY POWERED CIRCUIT
POST REGULATOR FOR SWITCHING SUPPLY
CYRIX
廬
6x86
TM
SUPPLIES
AMD-K5
TM
SUPPLIES
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
T
HE
A
PPLICATION OF THE
LX8585A & LX1431
IN A
75 & 166MH
Z
P54C P
ROCESSORS
U
SING
5V C
ACHE
5V
3
V
IN
V
OUT
2
V
O
4.6A
(See Table Below)
PLACE IN 碌P SOCKET CAVITY
LX8585A
1k鈩?/div>
ADJ
1
250pF
2
220碌F
10V
Low ESR
from
Sanyo
0.1碌F
50V
3
V
+
1
COL
REF
8
2.84k鈩?/div>
0.1%
1k鈩?/div>
0.01碌F
2x
330碌F, 6.3V
Low ESR
Oscon Type
from Sanyo
100碌F x 6
10V
AVX TYPE
TPS
A
VA I L A B L E
O
P T I O N S
Part #
碌P
Load
PER
P
AR T
#
1k
0.1%
Output
Voltage
Adjustable
1.5V
3.3V
LX8585/85A-00
LX8585/85A-15
LX8585/85A-33
LX1431
21k
1%
JP1
1碌F x 10
SMD
SGND
5
FGND
6
Other voltage options may be available 鈥?/div>
Please contact factory for details.
V
OUT
3.50
3.38
JP1
Short
Open
TYPICAL APPLICATION
120/166MHz, VRE, 5V Cache
75/90/100/133MHz, STND, 5V Cache
Thick traces represent high current traces which must be low resistance / low
inductance traces 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
Dropout
T
A
(擄C)
P
Plastic TO-220
DD
Plastic T0-263
Voltage
3-pin
3-pin
0 to 125
1.4V
1.2V
LX8585-xxCP
LX8585A-xxCP
LX8585-xxCDD
LX8585A-xxCDD
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8585A-00CDDT)
"xx" refers to output voltage, please see table above.
Copyright 漏 1997
Rev. 2.2 12/97
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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