LX8585-XX_05 Datasheet, PDF (1/10 Pages) Microsemi Corporation – 4.6A Low Dropout Positive Regulators

LX8585-xx / LX858A-xx
TM
®
4.6A Low Dropout Positive Regulators
PRODUCTION DATA SHEET
DESCRIPTION
The LX8585/85A Series ICs are short-circuit current. On-chip thermal
low dropout three-terminal regulators limiting provides protection against any
with a minimum of 4.6A output possible overload that would create
current. Pentium^® Processor and excessive junction temperatures. The
Power PCTM applications requiring LX8585/85A family is available in both
fast transient response are ideally through-hole and surface-mount
suited for this product family. The versions of the industry standard 3-pin
LX8585A is guaranteed to have < TO-220 / TO-263 power packages.
1.2V at 4.6A, while the LX8585 are The LX1431 Programmable
specified for 1.4V, making them ideal Reference and LX8585A Series
to provide well regulated outputs of products offer precision output voltage
2.5V to 3.6V using a 5V input supply. and are ideal for use in VRE
Fixed versions are also available and applications (see application below).
specified in the Available Options For higher current applications, see the
table below. Current limit is trimmed LX8584 data sheet.
above 4.6A to ensure adequate output
current and controlled
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
THE A PPLICATION OF THE LX8585A & LX1431 IN A
75 & 166 MHZ P54C PROCESSORS USING 5V CACHE
3
2
5V
V_IN
V_OUT
VO 4.6A
PLACE IN µP SOCKET CAVITY
(See Table Below)
LXP8a58r5t A
ADJ
1
250pF
1k Ω
1k Ω
0.01 µF
2x
330 µ F, 6.3V
Low ESR
Oscon Type
from Sanyo
100 µ F x 6
10V
220 µF
10V
Low ESR
from Sanyo
2
3 _V+
1
COL
REF ⁸
1k
0.1%
LPX1a4r3t1
2.84k Ω
21k
AVX TYPE
TPS
µP
Load
0.1%
1%
1 µ F x 10
0.1 µF
50V
SGND FGND
SMD
JP1
5
6
KEY FEATURES
ƒ Three Terminal Adjustable or
Fixed Output
ƒ Guaranteed < 1.2V headroom
@ 4.6A (LX8585A)
ƒ Guaranteed < 1.4V headroom
@ 4.6A (LX8585)
ƒ Guaranteed < 1.3V Headroom
@ 3A
ƒ Output Current of 4.6A
Minimum
ƒ Fast Transient Response
ƒ 1% Voltage Reference Initial
Accuracy
ƒ Output Short Circuit Protection
ƒ Built-In Thermal Shutdown
APPLICATIONS
ƒ Pentium Processor Supplies
ƒ Power PC Supplies
ƒ Microprocessor Supplies
ƒ Low Voltage Logic Supplies
ƒ Battery Powered Circuit
ƒ Post Regulator for Switching
Supply
ƒ CYRIX® 6x86™ Supplies
ƒ 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.
V_OUT
JP1
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.
T_A (°C)
0 to 125
Dropout
Voltage
1.4V
1.2V
PACKAGE ORDER INFO
Plastic TO-220
P _3-Pin
Plastic TO-263
DD _3-Pin
RoHS Compliant
Transition DC: 0543
RoHS Compliant
Transition DC: 0535
LX8585-xxCP
LX8585-xxCDD
LX8585A-xxCP
LX8585A-xxCDD
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
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Page 1