Microsemi Corporation LX8580-00CP Datasheet
LX8580
V
T
7A V
ERY LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
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
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
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.
PRODUCT HIGHLIGHT
SPECIAL CAPABILITIES OF THE LX8580 TO ALLOW 44%
SMALLER LDO THERMAL DISSIPATION
P RODUCTION DATA SHEET
■■
■ Low Dropout, 800mV Max. at 7A
■■
Output Current in Dual Supply Mode
■■
■ Fast Transient Response
■■
■■
■ Remote Sensing
■■
! 1mV Load Regulation
! Adjustable Output
! No Supply Sequencing Problems in Dual
Supply Mode
APPLICATIONS
■ Microprocessor Supplies
■ 3.3V to 2.5V Processor Power Supplies
■ High-Current Regulators
■ Post Regulators for Switching Supplies
CTRL
³ V
+ 1.3V Max
OUT
4
V
CTRL
OUTPUT
3
V
OU
LX8580
5
V
V
PWR
³ V
OUT
+ V
DROPOUT
PWR
SENSE
ADJUST
2
R
V
= V
OUT
REF
B
1 + + I
R
A
x R
ADJ
B
R
B
PACKAGE ORDER INFORMATION
T
(°C)
A
0 to 125 0.1V - 0.8V LX8580-00CP LX8580-00CDD
Dropout
Voltage
Plastic TO-220
P
5-pin
1
R
A
LOAD
Plastic TO-263
DD
5-pin
Copyright © 1999
Rev. 1.0 11/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN A VENUE, GARDEN G ROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
LX8580
V
PRODUCT DATABOOK 1996/1997
7A V
ERY LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation ......................................................................................Internally Limited
V
Input Voltage ........................................................................................................... 7V
PWR
Input Voltage ......................................................................................................... 13V
V
CTRL
Operating Junction Temperature
Plastic (P Package) ................................................................................................ 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal.
THERMAL DATA
P PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
θθ
θ
θθ
JT
θθ
θ
θθ
JA
θθ
θ
θθ
JT
θθ
θ
θθ
JA
3.0°C/W
60°C/W
3.0°C/W
60°C/W
PACKAGE PIN OUTS
TAB IS OUTPUT
5
1
P PACKAGE
(Top View)
TAB IS OUTPUT
5
4
3
2
1
DD PACKAGE
(Top View)
V
PWR
V
CTRL
OUTPUT
ADJUST
SENSE
V
PWR
V
CTRL
OUTPUT
ADJUST
SENSE
BLOCK DIAGRAM
Control
CTRL
Power
V
PWR
Current
Limiting
Amplifier
OUTPUT
Thermal Overload
Voltage
SENSE
Regulation
Amplifier
V
REF
ADJUST
2
Copyright © 1999
Rev. 1.0 11/99
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