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Microsemi Corporation - 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS

Numéro de référence LX8554-33CP
Description 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX8554-33CP fiche technique
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 8554
LX8554-xx
5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA 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® Proces-
sor and Power PCTM 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.
PRODUCT HIGHLIGHT
TYPICAL APPLICATION OF THE LX8554 IN A FLEXIBLE MOTHERBOARD WITH
OUTPUT VOLTAGE SELECTABLE VIA JUMPERS "JP1" AND "JP2"
VIN ³ 4.75
1500µF, 6.3V
Sanyo MVGX Series
LX8554
IN OUT
ADJ
VREF
200W
1%
R1
121W
1%
VO
(See Table Below)
3x 1500µF
6.3V
Sanyo
MVGX Series
R2
13W
1%
JP1
VOUT = VREF
1
+
R2
R1
+ IADJ R2
14.7W
1%
JP2
KEY FEATURES
s THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s GUARANTEED 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 PENTIUM PROCESSOR SUPPLIES
s POWER PC SUPPLIES
s MICROPROCESSOR SUPPLIES
s LOW VOLTAGE LOGIC SUPPLIES
s BATTERY POWERED CIRCUIT
s POST REGULATOR FOR SWITCHING SUPPLY
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8554-00
Adjustable
LX8554-33
3.3V
Other voltage options may be available —
Please contact factory for details.
JP1
Open
Open
Short
JP2
Open
Short
Short
OUTPUT VOLTAGE
3.6V
3.45V
3.3V
Copyright © 1997
Rev. 1.1 1/97
PACKAGE ORDER INFORMATION
TA (°C)
P
Plastic TO-220
3-pin
DD
Plastic
3-pin
T0-263
0 to 125
LX8554-xxCP
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.
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1

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