LT1584/LT1585/LT1587
TYPICAL APPLICATIONS
N
Guaranteed LT1584/LT1431 Circuit for the Intel 90MHz and 100MHz Pentium Processors
(Meets Intel Specifications with Worst-Case Tolerances)
5V
SEE NOTE 5 3
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTOR VALUES ARE OHMS,
1/8W, 5%
2. ALL CAPACITORS ARE 50V, 20%
3. ALL POLARIZED CAPACITORS ARE AVX
TYPE TPS OR EQUIVALENT
4. INPUT CAPACITANCE MAY BE REDUCED
IF THE 5V SUPPLY IS WELL BYPASSED
5. FOR 100MHz PENTIUM PROCESSOR,
INPUT VOLTAGE MUST BE AT LEAST
4.85V AT THE REGULATOR INPUT
6. FOR PENTIUM VRE PROCESSOR,
R4 NOT INSTALLED
– FOR 3.3V OUTPUT, INSTALL 0Ω JUMPER
RESISTOR R4
7. R3A TO R3E ARE B.I. TECHNOLOGY 627V100
THERMALLOY
7021B-MT
IN
OUT
LT1584
ADJ
1
R1
1k
C6
R2 0.01µF
1k
SENSE
R3D 5 R3E 6
83Ω
117Ω
SEE NOTE 7
4
R3C
800Ω
3
R3B
1.35k
2
R3A
1.15k
1
SGND
PGND
PGND
LT1584 • TA06
+
220µF
C2 TO C4
10V
AVX TPS
3 EACH
RELATED PARTS
PART NUMBER
LT1083/84/85
LT1083/84/85
LT1086
LT1521
LT1529
LT1580
DESCRIPTION
7.5A, 5A, 3A Low Dropout Linear Regulators
7.5A, 5A, 3A Low Dropout Linear Regulators
1.5A Low Dropout Linear Regulator
300mA Low Dropout Linear Regulator with 12µA Quiescent
Current and Shutdown
3A Low Dropout Linear Regulator with 50µA Quiescent
Current and Shutdown
7A Very Low Dropout Linear Regulator
COMMENTS
Fixed Output at 3.3V, 3.6V, 5V and 12V, V
IN
to 25V
Adjustable Output with up to 30V (V
IN
– V
OUT
) Differential
Both Fixed and Adjustable Versions, (V
IN
– V
OUT
) to 30V
Both Fixed and Adjustable Versions, Surface Mount
Package Available
Both Fixed and Adjustable Versions, Surface Mount
Package Available
540mV Dropout at 7A, Remote Sensing
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
U
PLACE IN MICROPROCESSOR
SOCKET CAVITY
2
SEE NOTE 6
R4
V
OUT
+
C8 TO C13
100µF
+
10V
AVX TPS
4 EACH
C14 TO C23
1µF
16V
AVX Y5V 0805
24 EACH
C5
33pF
NPO
C1
0.1µF
2
1
COMP COL
3
+
8
REF
V
LT1431S
4
7
R
M
R
T
SGND FGND
5
6
+
C7
100µF
10V
LT1584/LT1431 Transient Response
for 3.8A Load Current Step*
V
OUT
50mV/DIV
I
OUT
2A/DIV
100µs/DIV
LT1584 • TA07
*TRANSIENT RESPONSE
MEASURED WITH AN INTEL
POWER VALIDATOR.
V
OUT
IS MEASURED AT THE
POWER VALIDATOR
LT/GP 0395 10K • PRINTED IN USA
©
LINEAR TECHNOLOGY CORPORATION 1995
LINER [ LINEAR TECHNOLOGY ]
