LX8587X-XX Datasheet, PDF (1/11 Pages) Microsemi Corporation – 3A Low Dropout Positive Regulators

LX8587x-xx
®
3A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
DESCRIPTION
The LX8587/87A Series ICs are positive Current limit is trimmed about 3.1A to
regulators designed to provide 3A output ensure adequate output current and
current. Pentium® Processor and Power controlled short-circuit current. On-chip
PC™ applications requiring fast transient thermal limiting provides protection against
response are ideally suited for this product any combination of overload conditions that
family.
would create excessive junction
The LX8587A is guaranteed to have temperatures.
<1.2 dropout at 3A and the LX8587 < 1.3V The LX8587/87A family of products are
at the same current, making them ideal to available in the TO-220 through hole, the
provide well-regulated outputs of 2.5V to TO-263 surface-mount, and the TO-252
3.6V using a 5V input supply. Fixed surface-mount packages. For higher current
versions are also available and specified in applications see the LX8585 and the
the Available Options table below.
LX8584 data sheets.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
TYPICAL APPLICATION OF THE LX8587/87A IN A 5V TO 3.3V MOTHERBOARD
IN
V_IN > 4.75V
+
*1500µF
6MV1500GX
Sanyo
LX8587A
ADJ
200Ω
1%
OUT
121Ω
1%
+
3.3V
at 3A
1500µF
2x 6MV1500GX
Sanyo
The output capacitors must be low ESR and low ESL type for good transient response.
KEY FEATURES
ƒ Three-Terminal Adjustable Or
Fixed Output
ƒ Guaranteed < 1.2V Headroom At
3A (LX8587A)
ƒ Guaranteed < 1.3V Headroom At
3A (LX8587)
ƒ Output Current of 3A
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 Post Regulator for Switching
Supply
ƒ ASIC & Low Voltage Chipset
Supplies
ƒ Graphics & Sound Cards
ƒ Processor I/O Supply
PART #
LX8587/87A-00
OUTPUT
VOLTAGE
Adjustable
LX8587/87A-15
1.5V
LX8587/87A-33
3.3V
Table 1 - Available Options
T_A (°C)
0 to 125
Max Dropout
Voltage
1.3V
1.2V
PACKAGE ORDER INFO
DT
Plastic TO-252
(D-Pak) 3-Pin
P
Plastic TO-220
3-Pin
RoHS Compliant
Transition DC: 0532
RoHS Compliant
Transition DC: 0543
LX8587-xxCDT
LX8587-xxCP
LX8587A-xxCDT
LX8587A-xxCP
DD
Plastic TO-263
3-Pin
RoHS Compliant
Transition DC: 0535
LX8587-xxCDD
LX8587A-xxCDD
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8587-00CP-TR)
Copyright © 2000
Rev. 2.0a, 2005-10-25
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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