Document
LIN D O C #: 8584
LX8584-xx/8584A-xx/8584B-xx
7A L OW D ROPOUT P OSITIVE R E G U L AT O R S
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 LX8584/84A/84B series ICs are low dropout three-terminal positive regulators with a nominal 7A output current. This product family is ideally suited for Pentium® Processor and Power PCTM applications requiring fast transient response. The LX8584A is guaranteed 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 offers ±1% maximum voltage reference accuracy over temperature. Fixed versions are also available and are specified in the Available Options table below. Current limit is trimmed above 7.1A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload that would create excessive junction temperatures. The LX8584/84A series products are available 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 products offer precision output voltage (see application below) and are ideal for use in VRE applications.
K E Y F E AT U R E S
s THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT s GUARANTEED 1% VOLTAGE ACCURACY OVER TEMPERATURE (LX8584B) s GUARANTEED ≤ 1.2V HEADROOM AT 7A (LX8584A) s GUARANTEED ≤ 1.4V HEADROOM AT 7A (LX8584/84B) s OUTPUT CURRENT OF 7A 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
PRODUCT HIGHLIGHT
A P P L I C AT I O N S
s s s s s PENTIUM PROCESSOR SUPPLIES POWER PC SUPPLIES MICROPROCESSOR SUPPLIES LOW VOLTAGE LOGIC SUPPLIES POST REGULATOR FOR SWITCHING SUPPLY
T HE APPLICATION OF THE LX8584A & LX1431 IN A 75 & 166MH Z P54C PROCESSORS U SING 3.3V C ACHE
5V 3 VIN VOUT 2
VO 7A (See Table Below) PLACE IN µP SOCKET CAVITY
LX8584A
ADJ 1 250pF 2 220µF 10V Low ESR from Sanyo 0.1µF 50V 3 V+
1kW 1kW 0.01µF
3x 330µF, 6.3V Low ESR Oscon Type from Sanyo 100µF x 6 10V AVX TYPE TPS
1 COL REF 8 2.84kW 0.1%
D R O P O U T V O L TA G E V S . OUTPUT C URRENT
µP Load
1.5
1k 0.1%
LX8584/84A
TJ = 125°C
LX1431
SGND 5 FGND 6
21k 1% JP1
1µF x 10 SMD
Input / Output Differential - (V)
LX8584
1.0
LX8584A
VOUT 3.50 3.38
JP1 Short Open
TYPICAL APPLICATION 120/166MHz, VRE, 3.3V Cache 75/90/100/133MHz, STND, 3.3V Cache
0.5
Thick traces represent high current traces which must be low resistance / low inductance in order to achieve good transient response. PA C K A G E O R D E R I N F O R M AT I O N TA (°C) Dropout Voltage 1.4V 1.2V
0
1.75
3.5
5.25
7
Output Current - (A)
A VA I L A B L E O P T I O N S
Part #
LX8584/A/B-00 LX8584/A/B-33
PER
PART.