LX8585-xx / LX858A-xx
TM
廬
4.6A Low Dropout Positive Regulators
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
Three Terminal Adjustable or
Fixed Output
Guaranteed < 1.2V headroom
@ 4.6A (LX8585A)
Guaranteed < 1.4V headroom
@ 4.6A (LX8585)
Guaranteed < 1.3V Headroom
@ 3A
Output Current of 4.6A
Minimum
Fast Transient Response
1% Voltage Reference Initial
Accuracy
Output Short Circuit Protection
Built-In Thermal Shutdown
APPLICATIONS
The LX8585/85A Series ICs are
low dropout three-terminal regulators
with a minimum of 4.6A output
current. Pentium
廬
Processor and
Power PCTM applications requiring
fast transient response are ideally
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 controlled
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 precision output voltage
and are ideal for use in VRE
applications (see application below).
For higher current applications, see the
LX8584 data sheet.
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
T
HE
A
PPLICATION OF THE
LX8585A & LX1431
IN A
75 & 166 MH
Z
P54C P
ROCESSORS
U
SING
5V C
ACHE
3
5V
V
IN
V
OUT
2
VO 4.6A
(See Table Below)
2x
330 碌 F, 6.3V
Low ESR
Oscon Type
from Sanyo
100 碌 F x 6
10V
AVX TYPE
TPS
PLACE IN 碌P SOCKET CAVITY
Pentium Processor Supplies
Power PC Supplies
Microprocessor Supplies
Low Voltage Logic Supplies
Battery Powered Circuit
Post Regulator for Switching
Supply
CYRIX廬 6x86鈩?Supplies
AMD-K5鈩?Supplies
Available Options Per Part Number
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.
LX8585A
Part
ADJ
1
250pF
1k
惟
1k
惟
0.01 碌F
2
220 碌F
10V
Low ESR
from Sanyo
1
COL
REF
8
2.84k
惟
0.1%
1k
0.1%
3
V
+
碌P
Load
LX1431
Part
0.1 碌F
50V
21k
1%
JP1
1 碌 F x 10
SMD
SGND
5
FGND
6
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.
LX8585
LX8585
PACKAGE ORDER INFO
T
A
(擄C)
Dropout
Voltage
P
Plastic TO-220
3-Pin
RoHS Compliant
Transition DC: 0543
DD
Plastic TO-263
3-Pin
RoHS Compliant
Transition DC: 0535
0 to 125
1.4V
1.2V
LX8585-xxCP
LX8585A-xxCP
LX8585-xxCDD
LX8585A-xxCDD
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX8585-15CDD-TR)
Copyright
漏
1997
Rev. 2.2a, 2005-11-10
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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