LX8585-00 View Datasheet(PDF) - Microsemi Corporation
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LX8585-00 Datasheet PDF : 8 Pages
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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 #: 8585
LX8585-xx/8585A-xx
4.6A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA 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®
Processor and Power PCTM 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.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
THE APPLICATION OF THE LX8585A & LX1431 IN A
75 & 166MHZ P54C PROCESSORS USING 5V CACHE
3
2
5V
VIN
VOUT
LX8585A
1kΩ
VO 4.6A
(See Table Below)
2x
330µF, 6.3V
Low ESR
PLACE IN µP SOCKET CAVITY
ADJ
1
250pF
0.01µF
1kΩ
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
LX1431
2.84kΩ
21k
0.1%
1%
0.1µF
50V
SGND FGND
JP1
1µF x 10
SMD
5
6
KEY FEATURES
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 PENTIUM PROCESSOR SUPPLIES
s POWER PC SUPPLIES
s MICROPROCESSOR SUPPLIES
s LOW VOLTAGE LOGIC SUPPLIES
s BATTERY POWERED CIRCUIT
s POST REGULATOR FOR SWITCHING SUPPLY
s CYRIX® 6x86TM SUPPLIES
s AMD-K5TM SUPPLIES
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8585/85A-00
Adjustable
LX8585/85A-15
1.5V
LX8585/85A-33
3.3V
Other voltage options may be available —
Please contact factory for details.
V
JP1
OUT
TYPICAL APPLICATION
3.50 Short
120/166MHz, VRE, 5V Cache
3.38 Open 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.
PACKAGE ORDER INFORMATION
TA (°C)
Dropout
Voltage
P
Plastic TO-220
3-pin
DD
Plastic
3-pin
T0-263
0 to 125
1.4V
LX8585-xxCP
LX8585-xxCDD
1.2V
LX8585A-xxCP
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.
LINFINITY MICROELECTRONICS INC.
Copyright © 1997
Rev. 2.2 12/97
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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