LTC3707
32
3707fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2001
LT 0508 REV B • PRINTED IN USA
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC1159 High Effi ciency Synchronous Step-Down Switching Regulator 100% DC, Logic Level MOSFETs, V
IN
< 40V
LTC1438/LTC1439 Dual High Effi ciency Low Noise Synchronous Step-Down Switching Regulators POR, Auxiliary Regulator
LTC1438-ADJ Dual Synchronous Controller with Auxiliary Regulator POR, External Feedback Divider
LTC1538-AUX Dual High Effi ciency Low Noise Synchronous Step-Down Switching Regulator Auxiliary Regulator, 5V Standby
LTC1539 Dual High Effi ciency Low Noise Synchronous Step-Down Switching Regulator 5V Standby, POR, Low-Battery, Aux Regulator
LTC1530 High Power Step-Down Syncrhonous DC/DC Controller in SO-8 High Effi ciency 5V to 3.3V Conversion at Up to 15A
LTC1625/LTC1775
No R
SENSE
™ Current Mode Synchronous Step-Down Controller
97% Effi ciency, No Sense Resistor, 16-Pin SSOP
LTC1628/LTC1628-PG Dual High Effi ciency 2-Phase Synchronous Step-Down Switching Regulator Constant Frequency, 5V and 3.3V LDOs, VIN ≤ 36V
LTC1629
20A to 200A PolyPhase™ Synchronous Controller
Expandable from 2-Phase to 12-Phase, Uses All
Surface Mount Components, No Heat Sink
LTC1702 No R
SENSE
2-Phase Dual Synchronous Step-Down Controller 550kHz, No Sense Resistor
LTC1703 No R
SENSE
2-Phase Dual Synchronous Step-Down Controller with 5-Bit
Mobile VID Control
Mobile Pentium III Processors, 550kHz, V
IN
≤ 7V
LT1709 High Effi ciency, 2-Phase Synchronous Step-Down Switching Regulator with
5-Bit VID
1.3V ≤ V
OUT
≤ 3.5V, Current Mode Ensures Accurate
Current Sharing, 3.5V ≤ V
IN
≤ 36V
LTC1735 High Effi ciency Synchronous Step-Down Switching Regulator Output Fault Protection, 16-Pin SSOP
LTC1736 High Effi ciency Synchronous Controller with 5-Bit Mobile VID Control Output Fault Protection, 24-Pin SSOP, 3.5V ≤ V
IN
≤ 36V
LTC1929 2-Phase Synchronous Controller Up to 42A, Uses All Surface Mount Components,
No Heat Sink, 3.5V ≤ V
IN
≤ 36V
Adaptive Power, No RSENSE and PolyPhase are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
Figure 13. LTC3707 5V/4A, 3.3V/4A Regulator
0.1µF
4.7µF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+
22µF
50V
M1A M1B
M2A M2B
1µF
10V
0.1µF
10
0.015
0.015
INTV
CC
3.3V
0.1µF
20k
1%
105k
1%
33pF
15k
33pF
15k
220pF
220pF
1000pF
1000pF
0.1µF
20k
1%
63.4k
1%
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
FREQSET
STBYMD
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
PGOOD
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC3707
L1
8µH
L2
8µH
47µF 6.3V
56µF, 4V
GND
V
OUT2
3.3V
3A; 4A PEAK
V
OUT1
5V
3A; 4A PEAK
V
IN
5.2V TO
28V
3707 F13
+ +
V
IN
: 5.2V TO 28V
V
OUT
: 5V, 4A/3.3V, 4A
SWITCHING FREQUENCY = 300kHz
MI, M2: FDS6982S
L1, L2: 8mH SUMIDA CEP1238R0MC
OUTPUT CAPACITORS: PANASONIC SP SERIES
27pF
27pF
0.1µF
CMDSH-3TR
CMDSH-3TR
0.01µF
PGOOD
V
PULL-UP
(<7V)
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