LX8584-33

Manufacturer Part NumberLX8584-33
Description7 A LOW DROPOUT POSITIVE REGULATORS
ManufacturerMICROSEMI [Microsemi Corporation]
LX8584-33 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 LX8584/84A/84B series ICs are low drop-
out three-terminal positive regulators with a
nominal 7A output current. This product
family is ideally suited for Pentium
®
Proces-
TM
sor and Power PC
applications requiring
fast transient response. The LX8584A is guar-
anteed to have < 1.2V at 7A and the
LX8584/84B < 1.4V at 7A dropout voltage,
making them ideal to provide well regulated
outputs of 2.5V to 3.6V using a 5V input
supply. In addition, the LX8584B also of-
fers ±1% maximum voltage reference ac-
curacy over temperature. Fixed versions
are also available and are specified in the
Available Options table below.
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
LX8584A
1k
ADJ
0.01µF
1k
1
250pF
2
1
COL
3
8
220µF
V
V
V
+
+
+
REF
10V
Low ESR
LX1431
2.84k
from
Sanyo
0.1µF
SGND
FGND
50V
5
6
V
JP1
OUT
3.50
Short
3.38
Open
75/90/100/133MHz, STND, 3.3V Cache
Thick traces represent high current traces which must be low resistance /
low inductance in order to achieve good transient response.
P A C K A G E O R D E R I N F O R M A T I O N
Dropout
T
(°C)
P
A
Voltage
1.4V
0 to 125
1.2V
"xx" refers to output voltage, please see table above.
F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
11861 W
Copyright © 1997
Rev. 1.2
4/97
LX8584-xx/8584A-xx/8584B-xx
7 A L
O W
I
P
N N O V A T I O N
R O D U C T I O N
Current limit is trimmed above 7.1A to
ensure adequate output current and con-
trolled short-circuit current. On-chip ther-
mal limiting provides protection against any
combination of overload that would create
excessive junction temperatures.
The LX8584/84A series products are avail-
able in both the through-hole versions of
the industry standard 3-pin TO-220 and
TO-247 power packages.
The LX1431 Programmable Reference in
conjunction with the LX8584 7A LDO prod-
ucts offer precision output voltage (see ap-
plication below) and are ideal for use in VRE
applications.
LX8584A & LX1431
IN A
U
3.3V C
ROCESSORS
SING
ACHE
V
7A
PLACE IN µP SOCKET CAVITY
O
(See Table Below)
3x
330µF, 6.3V
Low ESR
Oscon Type
from Sanyo
100µF x 6
10V
AVX TYPE
1k
TPS
0.1%
21k
0.1%
1%
1µF x 10
SMD
JP1
TYPICAL APPLICATION
120/166MHz, VRE, 3.3V Cache
Plastic TO-220
Plastic TO-247
V
3-pin
3-terminal
LX8584-xxCP
LX8584-xxCV
LX8584B-xxCP
LX8584B-xxCV
LX8584A-xxCP
LX8584A-xxCV
A
, G
G
ESTERN
VENUE
ARDEN
ROVE
LIN D
O C
D
P
R
R O P O U T
O S I T I V E
E G U L A T O R S
D
S
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% VOLTAGE ACCURACY
OVER TEMPERATURE (LX8584B)
GUARANTEED
1.2V HEADROOM AT 7A
(LX8584A)
GUARANTEED
1.4V HEADROOM AT 7A
(LX8584/84B)
OUTPUT CURRENT OF 7A
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
ACCURACY
p OUTPUT SHORT CIRCUIT PROTECTION
p BUILT-IN THERMAL SHUTDOWN
EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
A P P L I C A T I O N S
PENTIUM PROCESSOR SUPPLIES
POWER PC SUPPLIES
MICROPROCESSOR SUPPLIES
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SWITCHING SUPPLY
D
V
R O P O U T
O L TA G E V S
O
C
U T P U T
U R R E N T
1.5
µP
LX8584/84A
Load
LX8584
1.0
0.5
0
1.75
3.5
Output Current - (A)
A
O
P
VA I L A B L E
P T I O N S P E R
Part #
Output Voltage
LX8584/A/B-00
Adjustable
LX8584/A/B-33
3.3V
Other voltage options may be available —
Please contact factory for details.
, CA. 92841
#: 8584
.
T
= 125°C
J
LX8584A
5.25
7
#
A R T
1

LX8584-33 Summary of contents

  • Page 1

    ... The LX8584/84A/84B series ICs are low drop- out three-terminal positive regulators with a nominal 7A output current. This product family is ideally suited for Pentium ® Proces- TM sor and Power PC applications requiring fast transient response ...

  • Page 2

    ... LX8584-xx/8584A-xx/8584B- Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Maximum Output Current ............................................................................................. 8A Operating Junction Temperature Plastic (P Package) ................................................................................................ 150° ...

  • Page 3

    ... LX8584/84B LX8584/84B Minimum Load Current Maximum Output Current Temperature Stability Long Term Stability RMS Output Noise (% OUT LX8584-33/84A-33/84B-33 (3.3V Fixed) Parameter Symbol Output Voltage LX8584/84A-33 LX8584B-33 Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Ripple Rejection (Note 3) Quiescent Current ...

  • Page 4

    ... LX8584-xx/8584A-xx/8584B-xx The LX8584/84A/84B 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 5

    ... Peff P where: R When the circuit is connected as shown in Figure 3, the parasitic resistance appears as its actual value, rather than the higher R LX8584/84A/84B FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION LX8584/84A/84B OUT IN V OUT ADJ V R1 REF I ADJ 50µA R2 ...

  • Page 6

    ... DROPOUT (MAX) for the installed regulator. THERMAL CONSIDERATIONS The LX8584/84A/84B regulators have internal power and thermal limiting circuitry designed to protect each device under overload conditions. For continuous normal load conditions, however, maximum junction temperature ratings must not be exceeded important to give careful consideration to all sources of thermal resistance from junction to ambient ...

  • Page 7

    ... FIGURE 6 — 5V REGULATOR WITH SHUTDOWN LX8584/84A/84B-33 OUT IN IN GND FIGURE 7 — FIXED 3.3V OUTPUT REGULATOR ) DROPOUT (MAX) Pentium is a registered trademark of Intel Corporation. Power trademark of International Business Machines Corporation LX8584/84A/84B OUT IN ADJ R1 121 C1* 10µ 1.25V 1 + OUT ...