LIN D
O C
#:
8554
LX8554-xx
5A E
XTREMELY
L
OW
D
ROPOUT
P
OSITIVE
R
EGULATORS
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 LX8554 series ICs are very low drop-
out three-terminal positive regulators with
5A rated output current. This product fam-
ily is ideally suited for Pentium
廬
Proces-
sor and Power PC
TM
applications requir-
ing fast transient response. The LX8554
is
guaranteed to have a dropout volt-
age under 1V at 5A load,
making it ideal
to provide well-regulated outputs of 2.5V
to 3.6V with input supply as low as 4.75V.
Fixed versions are also available and are
specified in the Available Options table
below.
Current limit is trimmed above 5.1A 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 LX8554 series products are avail-
able in both through-hole and surface-
mount versions of industry standard 3-pin
TO-220 / TO-263 power packages.
The LX8554 family of products are ideal
for use in multiple processor applications
where output voltage is jumper selected.
The LX8554 ICs offer precision output as
well as low supply operation (see appli-
cation below). For higher current appli-
cations see the LX8584 series of products.
K E Y F E AT U R E S
s
THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s
GUARANTEED
鈮?/div>
1V HEADROOM AT 5A
s
OUTPUT CURRENT OF 5A
p
FAST TRANSIENT RESPONSE
p
1% VOLTAGE REFERENCE INITIAL
ACCURACY
p
OUTPUT SHORT-CIRCUIT PROTECTION
p
BUILT-IN THERMAL SHUTDOWN
s
EVALUATION BOARD AVAILABLE:
REQUEST
LXE9001 EVALUATION KIT
A P P L I C AT I O N S
s
s
s
s
s
s
PENTIUM PROCESSOR SUPPLIES
POWER PC SUPPLIES
MICROPROCESSOR SUPPLIES
LOW VOLTAGE LOGIC SUPPLIES
BATTERY POWERED CIRCUIT
POST REGULATOR FOR SWITCHING SUPPLY
PRODUCT HIGHLIGHT
T
YPICAL
A
PPLICATION OF THE
LX8554
IN A
F
LEXIBLE
M
OTHERBOARD WITH
O
UTPUT
V
OLTAGE
S
ELECTABLE VIA
J
UMPERS
"JP1"
AND
"JP2"
V
IN
魯
4.75
1500碌F, 6.3V
Sanyo MVGX Series
IN
LX8554
ADJ
OUT
V
REF
R1
121W
1%
(See Table Below)
V
O
A
VA I L A B L E
O
P T I O N S
Part #
LX8554-00
LX8554-33
PER
P
AR T
#
200W
1%
R2
13W
1%
14.7W
1%
3x 1500碌F
6.3V
Sanyo
MVGX Series
Output
Voltage
Adjustable
3.3V
Other voltage options may be available 鈥?/div>
Please contact factory for details.
JP1
JP2
V
OUT
= V
REF
1 + R2 + I
ADJ
R2
R1
JP1
Open
Open
Short
JP2
Open
Short
Short
OUTPUT VOLTAGE
3.6V
3.45V
3.3V
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
P
Plastic TO-220
3-pin
LX8554-xxCP
DD
Plastic T0-263
3-pin
LX8554-xxCDD
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX8554-00CDDT)
"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 AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright 漏 1997
Rev. 1.1 1/97
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
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