LX8585-XX

Manufacturer Part NumberLX8585-XX
Description4.6A Low Dropout Positive Regulators
ManufacturerMICROSEMI [Microsemi Corporation]
LX8585-XX datasheet
 
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TM
D E S C R I P T I O N
The LX8585/85A Series ICs are
low dropout three-terminal regulators
with a minimum of 4.6A output
®
current.
Pentium
Processor
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
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
PPLICATION OF THE
75 & 166 MH
P54C P
Z
3
2
V
V
5V
IN
OUT
Part
LX8585A
1k Ω
ADJ
0.01 µF
1k Ω
1
250pF
2
1
COL
3
8
220 µF
V
V
V
+
+
+
REF
10V
Low ESR
Part
from Sanyo
LX1431
0.1 µF
SGND FGND
50V
5
6
V
JP1
OUT
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.
Dropout
T
(°C)
A
Voltage
0 to 125
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8585-15CDD-TR)
Copyright © 1997
Rev. 2.2a, 2005-11-10
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
®
4.6A Low Dropout Positive Regulators
short-circuit current. On-chip thermal
limiting provides protection against any
possible overload that would create
and
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.
http://www.microsemi.com
LX8585A & LX1431
IN A
U
5V C
ROCESSORS
SING
ACHE
V O 4.6A
PLACE IN µP SOCKET CAVITY
(See Table Below)
2x
330 µ F, 6.3V
Low ESR
Oscon Type
from Sanyo
100 µ F x 6
10V
AVX TYPE
1k
TPS
µP
0.1%
Load
2.84k Ω
21k
0.1%
1%
1 µ F x 10
SMD
JP1
Typical Application
P A C K A G E O R D E R I N F O
Plastic TO-220
P
3-Pin
RoHS Compliant
Transition DC: 0543
1.4V
LX8585-xxCP
1.2V
LX8585A-xxCP
Microsemi
Integrated Products Division
LX8585-xx / LX858A-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 < 1.2V 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
A P P L I C A T I O N S
Pentium Processor Supplies
Power PC Supplies
Microprocessor Supplies
Low Voltage Logic Supplies
Battery Powered Circuit
Post Regulator for Switching
Supply
CYRIX® 6x86™ Supplies
AMD-K5™ 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.
Plastic TO-263
DD
3-Pin
RoHS Compliant
Transition DC: 0535
LX8585-xxCDD
LX8585A-xxCDD
Page 1

LX8585-XX Summary of contents

  • Page 1

    ... Plastic TO-220 P 3-Pin RoHS Compliant Transition DC: 0543 1.4V LX8585-xxCP 1.2V LX8585A-xxCP Microsemi Integrated Products Division LX8585-xx / LX858A- RODUCTION ATA HEET Three Terminal Adjustable or Fixed Output Guaranteed < 1.2V headroom @ 4.6A (LX8585A) Guaranteed < 1.4V headroom @ 4.6A (LX8585) Guaranteed < ...

  • Page 2

    ... A 60°C/W MBIENT JA , θ T 3.0°C θ A 60°C/W MBIENT JA x θ Microsemi Integrated Products Division LX8585-xx / LX858A- RODUCTION ATA HEET TAB is GND ADJ/GND ACKAGE (Top View) TAB is GND ...

  • Page 3

    ... T = 125°C, 1000hrs OUT 25°C, 10Hz < f < 10kHz OUT(RMS forced below its nominal value by 100mV. OUT Microsemi Integrated Products Division LX8585-xx / LX858A- RODUCTION ATA HEET ≤ ≤ T 70°C except where A LX8585/85A Min Typ Max 1 ...

  • Page 4

    ... Figure 3 – 5V Regulator With Shutdown LX8585-33/85A-33 IN OUT GND Figure 4 – Fixed 3.3V Output Regulator ) Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET LX8585/85A OUT IN V ADJ R1 121Ω C2 100µ 1.25V 1 + ...

  • Page 5

    ... SOA circuit, based on the large input-to-output voltage across the regulator at the time the short circuit is removed from the output. Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET Minumum Load ...

  • Page 6

    ... When the circuit is connected as shown in Figure 7, the parasitic resistance appears as its actual value, rather than the higher R LX8585/85A very small and ADJ Figure 7 – Connections For Best Load Regulation Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET LX8585/85A OUT V OUT ADJ V ...

  • Page 7

    ... T 11W(2.7 C/W 1.0 J **Although the device can operate up to 150°C junction recommended for long term reliability to keep the junction temperature below 125°C whenever possible. Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET = 5.0A OUT = 50° ΘCS ΘSA ...

  • Page 8

    ... K T 5.84 U 0.508 Note: 1. Dimensions do not include mold flash or protrusions; J these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET I ILLIMETERS NCHES MAX MIN MAX 15.88 0.560 0.625 10 ...

  • Page 9

    ... 14. Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. dimension shall not include solder coverage. Microsemi Integrated Products Division LX8585-xx / LX858A- ATA HEET I ILLIMETERS NCHES MAX MIN MAX 10.67 0.395 0.420 9 ...

  • Page 10

    ... Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 1997 Rev. 2.2a, 2005-11-10 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 LX8585-xx / LX858A-xx ® 4.6A Low Dropout Positive Regulators P RODUCTION ...