36
LTC1702
1702fa
LT 0306 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1999
TYPICAL APPLICATION
U
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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SENSE
TM
Current Mode Synchronous Step-Down Controller Above 95% Efficiency, Needs No R
SENSE
, 16-Lead SSOP Package
Fits SO-8 Footprint
LTC1628 Dual High Efficiency 2-Phase Synchronous Step-Down Controller Constant Frequency, Standby 5V and 3.3V LDOs, 3.5V ≤ V
IN
≤ 36V
LTC1703 Dual 550kHz Synchronous 2-Phase Switching Regulator Controller LTC1702 with 5-Bit Mobile VID for Mobile Pentium
®
Processor
with Mobile VID Systems
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Regulators
LTC1709 2-Phase, 5-Bit Desktop VID Synchronous Step-Down Controller Current Mode, V
IN
to 36V, I
OUT
Up to 42A
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LTC1753 5-Bit Desktop VID Programmable Synchronous 1.3V to 3.5V Programmable Output Using Internal 5-Bit DAC
Switching Regulator
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LTC1929 2-Phase, Synchronous High Efficiency Converter Current Mode Ensures Accurate Current Sensing,
V
IN
Up to 36V, I
OUT
Up to 40A
No R
SENSE
is a trademark of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
Low Cost Dual Supply with 2.5V Keepalive
+
FB2
COMP2
RUN/SS2
FB1
COMP1
FCB
BOOST2
TG2
SW2
BG2
I
MAX2
V
CC
PV
CC
SGND PGND
LTC1702
4.75k
0.1%
0.1µF
39pF
56pF
220pF
330pF
56k
20k
1%
16k
1%
QSS2
QSS1
C
IN
= SANYO 10MV1200GX (6 IN PARALLEL)
C
OUT1
= SANYO 6MV1500GX (8 IN PARALLEL)
C
OUT2
= SANYO 6MV1500GX (3 IN PARALLEL)
L1: 1µH SUMIDA CEP125-1R0MC-H
L2: 2.2µH COILTRONICS UP2B-2R2
V
IN
5V
±10%
STBY/ON
1k
68k
1k
10k
0.1%
47k
QT2
MBR0530T
1µF
QB2
QT1A
QT1B
MBR0530T
1µF
C
OUT1
1702 TA04
+
C
OUT2
+
10µF
+
C
IN
1µF
16.9k
0.1%
16.2k
0.1%
V
OUT2
2.5V/7A
2.45V/100mA
STANDBY
V
OUT1
1.8V
20A
10Ω
L1
QB1A
QB1B
33k
FAULT
BOOST1
TG1
SW1
BG1
I
MAX1
L2
IN OUT
GND
LT1761
ADJ
RUN/SS1
QSS1, QSS2: MOTOROLA MMBT3904LT1
QT1A, QT1B, QB1A, QB1B: FAIRCHILD FDS6670A
QT2, QB2: 1/2 SILICONIX Si4966
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
