16
LT1580/LT1580-2.5
LINEAR TECHNOLOGY CORPORATION 1995
TYPICAL APPLICATION
U
Dual Regulators Power Pentium Processor or Upgrade CPU
PART NUMBER DESCRIPTION COMMENTS
LTC
®
1266 Synchronous Switching Controller >90% Efficient High Current Microprocessor Supply
LTC1267 Dual High Efficiency Synchronous Switching Regulator >90% Efficiency with Fixed 5V, 3.3V or Adjustable Outputs
LTC1430 High Power Synchronous Step-Down Switching Regulator >90% Efficient High Current Microprocessor Supply
LT1584 7A Low Dropout Fast Transient Response Regulator For High Performance Microprocessors
LT1585 4.6A Low Dropout Fast Transient Response Regulator For High Performance Microprocessors
LT1587 3A Low Dropout Fast Transient Response Regulator For High Performance Microprocessors
RELATED PARTS
C1
220µF
10V
C3
220µF
10V
C10
1µF
C9
220µF
10V
C2
220µF
10V
C5
0.33µF
C11
22µF
35V
LT1587
ADJ
V
IN
V
OUT
–
+
I/O
SUPPLY
3.5V/3.3V
C8
0.1µF
C4
0.33µF
C6
0.01µF
R3
110Ω
1%
R11
10k
R2
470Ω
R14, 2Ω
R13
0.005Ω*
R8
107Ω
0.35%
R12
0.0075Ω*
D1
1N4148
D2
1N4148
R4
178Ω
1%
R1
10k
5V
5V
12V
R10
10k
R7
107Ω
0.25%
R5
10k
E3
TO CPU
VOLTAGE
SELECT PIN
5V
R9
10k
R6
89.8Ω
0.5%
Q1
ZVN4206
Q2
2N3904
Q3
2N7002
Q3
2N7002
1580 TA04
12V
1
3
2
CORE
SUPPLY
3.5V/2.5V
LT1006
C7
330µF
6.3V
LT1580
4
5
V
CONTROL
V
POWER
SENSE
V
OUT
ADJ
*RESISTORS ARE IMPLEMENTED AS COPPER TRACES ON PCB
IF 1 OZ COPPER, TRACE WIDTHS ARE 0.05 INCH
IF 2 OZ COPPER, TRACE WIDTHS ARE 0.025 INCH
R13 IS 0.83 INCHES LONG, R12 IS 1.24 INCHES LONG
E3
0
1
CPU TYPE
P55C
P54C
+
+
++
+
+
158025fas, sn158025 LT/GP 0598 2K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
