LT1581-2.5 Ver la hoja de datos (PDF) - Linear Technology
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LT1581-2.5 Datasheet PDF : 12 Pages
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LT1581/LT1581-2.5
TYPICAL APPLICATION
Dual Regulators Power Pentium Processor or Upgrade CPU
R12
0.0075Ω*
5V
12V
+ C1
VIN VOUT
R1
10k
+
C8
0.1µF
220µF
10V
D1
1N4148
R2
470Ω
LT1587
ADJ
LT1006
–
C6
R10
0.01µF
10k
D2
1N4148
R4
178Ω
1%
R13
0.005Ω*
12V C11 +
22µF
35V
6
3
VCONT SENSE
LT1581
5 VPOWER VOUT 4
R14, 2Ω
C10
1µF
+ C9 + C2
ADJ
220µF
220µF
1
10V
10V
C5
0.33µF
R7
107Ω
0.25%
R8
107Ω
0.35%
5V
R5
R6
Q1
10k
89.8Ω
ZVN4206
0.5%
Q2
2N3904
*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 CPU TYPE
0 P55C
1 P54C
R3
110Ω
1%
I/O
+ C3
SUPPLY
3.5V/3.3V
220µF
10V
C4
0.33µF
5V
R11
10k
+ C7
330µF
6.3V
Q3
R9 2N7002
10k
CORE
SUPPLY
3.5V/2.5V
E3
TO CPU
VOLTAGE
SELECT PIN
1581 TA04
RELATED PARTS
PART NUMBER
LTC®1430
LTC1435
LT1575/LT1577
LT1580
LT1584
LT1585
DESCRIPTION
High Power Synchronous Step-Down Switching Regulator
High Current Synchronous Step-Down Controller
Single and Dual Low Dropout Regulator Controllers
7A Fast Transient Response Regulator with 0.7V Dropout
7A Low Dropout Fast Transient Response Regulator
4.6A Low Dropout Fast Transient Response Regulator
COMMENTS
> 90% Efficiency High Current Microprocessor Supply
> 90% Efficiency in 12V to 3.3V Applications
Fast Transient Response, No Bulk Capacitors Needed
For 3.3V to 2.XXV Applications
For High Performance Microprocessors
For High Performance Microprocessors
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 qFAX:(408)434-0507 q www.linear-tech.com
158125fa LT/TP 0399 2K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1996
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