LX8584-33 MICROSEMI [Microsemi Corporation], LX8584-33 Datasheet

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LX8584-33

Manufacturer Part Number
LX8584-33
Description
7 A LOW DROPOUT POSITIVE REGULATORS
Manufacturer
MICROSEMI [Microsemi Corporation]
Datasheet
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T
Copyright © 1997
Rev. 1.2
H E
5V
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
sor and Power PC
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.
4/97
I
220µF
10V
Low ESR
from
Sanyo
N F I N I T E
Thick traces represent high current traces which must be low resistance /
0 to 125
3
T
A
V
(°C)
IN
low inductance in order to achieve good transient response.
LX8584A
75 & 166MH
3.50
3.38
V
0.1µF
50V
ADJ
T
OUT
P A C K A G E O R D E R I N F O R M A T I O N
1
HE
TM
3
V
"xx" refers to output voltage, please see table above.
OUT
250pF
A
P
V
V
V
applications requiring
2
+
+
+
PPLICATION OF THE
Dropout
SGND
Voltage
2
O W E R
Open
1.4V
1.2V
Short
LX1431
P R O D U C T H I G H L I G H T
5
JP1
1k
COL
FGND
Z
1
1k
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
P54C P
6
D E S C R I P T I O N
REF
®
O F
75/90/100/133MHz, STND, 3.3V Cache
Proces-
P
0.01µF
8
11861 W
2.84k
LX8584A-xxCP
LX8584B-xxCP
0.1%
120/166MHz, VRE, 3.3V Cache
Plastic TO-220
3-pin
LX8584-xxCP
I
ROCESSORS
N N O V A T I O N
LX8584A & LX1431
TYPICAL APPLICATION
1k
0.1%
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.
able in both the through-hole versions of
the industry standard 3-pin TO-220 and
TO-247 power packages.
conjunction with the LX8584 7A LDO prod-
ucts offer precision output voltage (see ap-
plication below) and are ideal for use in VRE
applications.
330µF, 6.3V
ESTERN
Oscon Type
from Sanyo
Current limit is trimmed above 7.1A to
The LX8584/84A series products are avail-
The LX1431 Programmable Reference in
JP1
Low ESR
21k
1%
U
(See Table Below)
3x
SING
V
A
O
VENUE
7A
3.3V C
V
LX8584A-xxCV
LX8584B-xxCV
Plastic TO-247
3-terminal
LX8584-xxCV
, G
PLACE IN µP SOCKET CAVITY
LX8584-xx/8584A-xx/8584B-xx
IN A
ARDEN
ACHE
1µF x 10
SMD
100µF x 6
AVX TYPE
7 A L
10V
TPS
G
ROVE
P
O W
R O D U C T I O N
, CA. 92841
Load
µP
D
R O P O U T
A
VA I L A B L E
Other voltage options may be available —
Part #
LX8584/A/B-00
LX8584/A/B-33
1.5
1.0
0.5
Please contact factory for details.
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
p OUTPUT SHORT CIRCUIT PROTECTION
p BUILT-IN THERMAL SHUTDOWN
0
THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
GUARANTEED 1% VOLTAGE ACCURACY
OVER TEMPERATURE (LX8584B)
GUARANTEED
(LX8584A)
GUARANTEED
(LX8584/84B)
OUTPUT CURRENT OF 7A
ACCURACY
EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
PENTIUM PROCESSOR SUPPLIES
POWER PC SUPPLIES
MICROPROCESSOR SUPPLIES
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SWITCHING SUPPLY
P
LX8584/84A
O S I T I V E
D
O
K E Y F E A T U R E S
A P P L I C A T I O N S
D
1.75
R O P O U T
P T I O N S P E R
A T A
O
Output Current - (A)
U T P U T
Output Voltage
1.2V HEADROOM AT 7A
1.4V HEADROOM AT 7A
LIN D
R
V
S
3.5
Adjustable
C
E G U L A T O R S
O L TA G E V S
H E E T
U R R E N T
3.3V
LX8584
O C
P
A R T
5.25
#: 8584
T
LX8584A
.
J
= 125°C
#
1
7

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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 ...

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