28
LTC1735-1
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1999
sn17351 17351fs LT/TP 0100 4K • PRINTED IN USA
TYPICAL APPLICATIO
U
High Efficiency Dynamic Output Voltage Selectable CPU Power Supply for SpeedStep Enabled Processors
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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IN
< 48V
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IN
< 40V
LT1375/LT1376 1.5A 500kHz Step-Down Switching Regulator High Efficiency
LTC1435A High Efficiency Low Noise Synchronous Step-Down Controller, N-Ch Drive Burst Mode Operation, 16-Pin Narrow SO
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TM
Mode 20-Pin, 24-Pin SSOP
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Q
= 10µA
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IN
≤ 36V
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IN
≤ 7V
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TM
Synchronous Controller with 5-Bit VID Up to 42A, Minimum Input Capacitors,
1.3V ≤ V
OUT
≤ 3.5V
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Adaptive Power and PolyPhase are trademarks of Linear Technology Corporation.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
OSC
RUN/SS
I
TH
PGOOD
SENSE
–
SENSE
+
V
OSENSE
SGND
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
LTC1735-1
C
S1
1000pF
C
C2
330pF
C
OSC
47pF
C1
47pF
C
C1
47pF
C
SS
0.1µF
R
C1
33k
R7
100k
R6
680k
R8
4.7Ω
JP1
LATCH-OFF
DISABLE
PGOOD RUN
INTV
CC
+
C2
4.7µF
C4
1µF
5V
INPUT
(OPTIONAL)
C2
47pF
Q4
2N7002
GND
C3
47pF
R1
10k
0.5%
V
OUT
1.35V OR 1.60V
12A
V
SEL
= 1: V
OUT
= 1.60V
V
SEL
= 0: V
OUT
= 1.35V
D1
CMDSH-3
D2
MBRS340T3
C
B
0.22µF
Q1
FDS6680A
C
IN
22µF
50V
CERAMIC
×2
L1
1.2µH
R
SENSE
0.004Ω
V
IN
4.5V TO 24V
Q2, Q3
FDS6680A
×2
R5 10Ω
1735-1 TA01
R3
33.2k
1%
R2
14.3k
0.5%
R4 10Ω
+
C
OUT
180µF
4V
SP
×4
C
F1
0.1µF
C
IN
: MARCON THCR70E1H226ZT
C
OUT
: PANASONIC EEFVE06181R
L1: PANASONIC ETQP6F1R2HFA
R
SENSE
: IRC CRF2512-01-R004F
