LX8580
7A V
ERY
L
OW
D
ROPOUT
P
OSITIVE
A
DJUSTABLE
R
EGULATOR
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The LX8580 is a high-performance, very
low dropout voltage regulator, designed for
use with advanced microprocessors. This
product can be used with separate voltage
supplies for the control and power sections,
allowing a power section dropout voltage
as low as 100mV. The LX8580 can also be
used in a single voltage supply configuration,
with a dropout performance similar to that
of the LX8584 (1.3V at 7A).
The LX8580 is supplied in a five-
terminal TO-220 package, which allows the
implementation of remote (Kelvin) voltage
sensing. This sensing compensates for
output voltage variations due to load
changes and resistive voltage drops in
connectors and board traces. Typical load
regulation measured at the sense pin is less
than 1mV for a load current step of 7mA
to 7A.
The LX8580 is ideal for generating a
secondary 2 - 2.5V low voltage supply on a
motherboard where a 3.3V supply is already
available.
K E Y F E AT U R E S
I
Low Dropout, 800mV Max. at 7A
Output Current in Dual Supply Mode
I
Fast Transient Response
I
Remote Sensing
!
1mV Load Regulation
!
Adjustable Output
!
No Supply Sequencing Problems in Dual
Supply Mode
A P P L I C AT I O N S
I
I
I
I
Microprocessor Supplies
3.3V to 2.5V Processor Power Supplies
High-Current Regulators
Post Regulators for Switching Supplies
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
S
P E C I A L
C
A PA B I L I T I E S O F T H E
LX8580 T
O
A
L L O W
44%
S
M A L L E R
LDO T
H E R M A L
D
I S S I PAT I O N
V
CTRL
魯
V
OUT
+ 1.3V Max
4
V
CTRL
OUTPUT
3
V
OUT
LX8580
V
PWR
魯
V
OUT
+ V
DROPOUT
5
V
PWR
SENSE
1
2
ADJUST
R
A
LOAD
R
錚?/div>
V
OUT
= V
REF
錚?/div>
1 +
B
R
A
錚?/div>
錚?/div>
錚?/div>
+ I
ADJ
x R
B
錚?/div>
R
B
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(擄C)
0 to 125
Dropout
Voltage
0.1V - 0.8V
P
Plastic TO-220
5-pin
LX8580-00CP
DD
Plastic TO-263
5-pin
LX8580-00CDD
Copyright 漏 1999
Rev. 1.0 11/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
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