Datasheet

11
LT1585A/LT1585A-3.3
1585afa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIONS N
U
Guaranteed LT1585A Circuit for the Intel 100MHz and Higher Frequency Pentium Processors
(Meets Intel Specifications with Worst-Case Tolerances)
+
LT1585A
ADJ
IN
R1
1k
C2 TO C4
220µF
10V
AVX TPS
3 EACH
5V
OUT
3
SEE NOTE 6
SEE NOTE 5
SEE NOTE 7
2
1
2
R2
1k
R4
65
4
3
2
1
R3E
117Ω
R3D
83Ω
C6
0.01µF
C1
0.1µF
C5
33pF
NPO
1
56
8
7
3
4
R3C
800Ω
R3B
1.35k
R3A
1.15k
LT1431S
COMP COL
SGND FGND
V
+
REF
R
T
R
M
PGND
SGND
LT1584 • TA06
PGND
SENSE
V
OUT
PLACE IN MICROPROCESSOR
SOCKET CAVITY
C14 TO C23
1µF
16V
AVX Y5V 0805
10 EACH
C8 TO C13
100µF
10V
AVX TPS
6 EACH
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
+
C7
100µF
10V
THERMALLOY
7021B-MT
+ +
LT1585A/LT1431 Transient Response
for 3.8A Load Current Step*
V
OUT
50mV/DIV
I
OUT
2A/DIV
100µs/DIV
LT1584A • TA06
*TRANSIENT RESPONSE MEASURED WITH AN INTEL
POWER VALIDATOR. V
OUT
IS MEASURED AT THE
POWER VALIDATOR