LX8585-00

Manufacturer Part NumberLX8585-00
Description4.6A LOW DROPOUT POSITIVE REGULATORS
ManufacturerMICROSEMI [Microsemi Corporation]
LX8585-00 datasheet
 
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T
I
P
H E
N F I N I T E
O W E R
O F
D E S C R I P T I O N
The LX8585/85A Series ICs are low drop-
out three-terminal regulators with a mini-
mum of 4.6A output current. Pentium
Processor and Power PC
TM
applications
requiring fast transient response are ide-
ally 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 con-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
P R O D U C T H I G H L I G H T
T
A
HE
PPLICATION OF THE
75 & 166MH
P54C P
Z
3
2
V
V
5V
IN
OUT
LX8585A
1k
ADJ
0.01µF
1k
1
250pF
2
1
COL
3
8
220µF
V
V
V
+
+
+
REF
10V
Low ESR
LX1431
from
Sanyo
0.1µF
SGND
FGND
50V
5
6
V
JP1
OUT
3.50
Short
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
(°C)
A
0 to 125
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8585A-00CDDT)
L
I N
Copyright © 1997
11861 W
A
Rev. 2.2
12/97
ESTERN
4 . 6 A L
I
P
N N O V A T I O N
trolled short-circuit current. On-chip
thermal limiting provides protection
®
against any possible overload that would
create 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 pre-
cision output voltage and are ideal for
use in VRE applications (see application
below). For higher current applications,
see the LX8584 data sheet.
LX8585A & LX1431
IN A
U
5V C
ROCESSORS
SING
ACHE
V
4.6A
PLACE IN µP SOCKET CAVITY
O
(See Table Below)
2x
330µF, 6.3V
Low ESR
Oscon Type
from Sanyo
100µF x 6
10V
AVX TYPE
1k
TPS
0.1%
2.84k
21k
0.1%
1%
1µF x 10
SMD
JP1
TYPICAL APPLICATION
120/166MHz, VRE, 5V Cache
P A C K A G E O R D E R I N F O R M A T I O N
Plastic TO-220
Dropout
P
3-pin
Voltage
1.4V
LX8585-xxCP
1.2V
LX8585A-xxCP
"xx" refers to output voltage, please see table above.
F
M
I N I T Y
I C R O E L E C T R O N I C S
, G
G
, CA. 92841, 714-898-8121, F
VENUE
ARDEN
ROVE
LIN D
LX8585-xx/8585A-xx
D
P
R
O W
R O P O U T
O S I T I V E
E G U L A T O R S
D
S
R O D U C T I O N
A T A
H E E T
K E Y F E A T U R E S
THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
GUARANTEED < 1.2V HEADROOM AT 4.6A
(LX8585A)
GUARANTEED < 1.4V HEADROOM AT 4.6A
(LX8585)
GUARANTEED < 1.3V HEADROOM AT 3A
OUTPUT CURRENT OF 4.6A MINIMUM
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
ACCURACY
p OUTPUT SHORT CIRCUIT PROTECTION
p 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
TM
SUPPLIES
AMD-K5
TM
SUPPLIES
A
O
VA I L A B L E
P T I O N S P E R
Part #
µP
LX8585/85A-00
Adjustable
Load
LX8585/85A-15
LX8585/85A-33
Other voltage options may be available —
Please contact factory for details.
Plastic T0-263
DD
3-pin
LX8585-xxCDD
LX8585A-xxCDD
I
.
N C
: 714-893-2570
AX
#: 8585
O C
P
#
A R T
Output
Voltage
1.5V
3.3V
1

LX8585-00 Summary of contents

  • Page 1

    ... Thick traces represent high current traces which must be low resistance / low inductance traces in order to achieve good transient response. T (° 125 Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8585A-00CDDT Copyright © 1997 11861 W A Rev ...

  • Page 2

    ... LX8585-xx/8585A- Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Operating Junction Temperature Plastic (P, DD Package) ........................................................................................ 150°C Storage Temperature Range ...................................................................... -65° ...

  • Page 3

    ... LX8585-xxC/85A-xxC with 0° 3V 4.6A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) IN OUT OUT LX8585-00 / 8585A-00 (Adjustable) Parameter Symbol Reference Voltage LX8585/85A Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation ...

  • Page 4

    ... LX8585-xx/8585A- LX8585-33 / 8585A-33 (3.3V Fixed) Parameter Output Voltage (Note 4) Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation (Note 3) ...

  • Page 5

    ... The LX8585/85A Series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of a voltage regulator: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165° ...

  • Page 6

    ... OUT ADJ V R1 REF I ADJ 50µ REF ADJ R1 regulators are three-terminal devices R2+ Actual parasitic line resistance Parasitic LX8585/85A Line Resistance OUT ADJ Connect R1 to Case of Regulator Connect R2 to Load Copyright © 1997 Rev. 2.2 . Peff 12/97 ...

  • Page 7

    ... T = 11W (2.7°C/W + 1.0°C/W + 3.0°C/W) + 50°C = 124° Although the device can operate up to 150°C junction recom- mended for long term reliability to keep the junction temperature below 125°C whenever possible. LX8585-xx/8585A- 2.8V 5.0A OUT = 50° 2.7°C/W for TO-220 ...

  • Page 8

    ... FIGURE 6 — 5V REGULATOR WITH SHUTDOWN LX8585-33/85A-33 V OUT IN IN GND FIGURE 7 — FIXED 3.3V OUTPUT REGULATOR ) DROPOUT (MAX LX8585/85A OUT IN ADJ R1 121 C1* 10µ Needed if device is far from filter capacitors 1.25V 1 + OUT R1 FIGURE 5 — ...