28
LTC3727LX-1
3727lx1fa
PART NUMBER DESCRIPTION COMMENTS
LTC1625/LTC1775 No R
SENSE
TM
Current Mode Synchronous Step-Down Controllers 97% Efficiency, No Sense Resistor, 16-Pin SSOP
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 Mobile Pentium
®
III Processors, 550kHz, V
IN
≤ 7V
with 5-Bit Mobile VID Control
LTC1708-PG 2-Phase, Dual Synchronous Controller with Mobile VID 3.5V ≤ V
IN
≤ 36V, VID Sets V
OUT1
, PGOOD
LT1709/ High Efficiency, 2-Phase Synchronous Step-Down Switching 1.3V ≤ V
OUT
≤ 3.5V, Current Mode Ensures Accurate
LT1709-8 Regulators with 5-Bit VID Current Sharing, 3.5V ≤ V
IN
≤ 36V
LTC1735 High Efficiency Synchronous Step-Down Switching Regulator Output Fault Protection, 16-Pin SSOP
LTC1736 High Efficiency Synchronous Controller with 5-Bit Mobile VID Control Output Fault Protection, 24-Pin SSOP, 3.5V ≤ V
IN
≤ 36V
LTC1876 Triple Output DC/DC Synchronous Controller Dual, 2-Phase Step-Down and Step-Up DC/DC Converter,
2.6V ≤ V
IN
≤ 36V, Fixed Frequency 150kHz to 300kHz
LTC1778 No R
SENSE
Wide Input Range Synchronous Step-Down Controller Up to 97% Efficiency, 4V ≤ V
IN
≤ 36V,
0.8V ≤ V
OUT
≤ (0.9)(V
IN
), I
OUT
Up to 20A
LTC1929/ 2-Phase Synchronous Controllers Up to 42A, Uses All Surface Mount Components,
LTC1929-PG No Heat Sinks, 3.5V ≤ V
IN
≤ 36V
LTC3727/LTC3727-1/
Dual, 2-Phase Synchronous Controllers Very Low Dropout; V
OUT
≤ 14V, 4V ≤ V
IN
≤ 36V
LTC3727A-1
LTC3728 2-Phase 550kHz, Dual Synchronous Step-Down Controller QFN and SSOP Packages, High Frequency for Smaller L and C
LTC3729 20A to 200A PolyPhase
®
Synchronous Controllers Expandable from 2-Phase to 12-Phase, Uses All Surface
Mount Components, No Heat Sink
LTC3731 3-Phase, 600kHz Synchronous Step-Down Controller 0.6V ≤ V
OUT
≤ 6V, 4.5V ≤ V
IN
≤ 32V, I
OUT
≤ 60A, Integrated
MOSFET Drivers
LTC3827/LTC3827-1 Low I
Q
, Dual 2-Phase Synchronous Controllers 80µA Quiescent Current 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V
PolyPhase is a registered trademark of Linear Technology Corporation. No R
SENSE
is a trademark of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 0107 • PRINTED IN USA
RELATED PARTS
Figure 13. LTC3727LX-1 8.5V/3A, 5V/5A Regulator
0.1µF
4.7µF
+
22µF
50V
D1
MBRM
140T3
D2
MBRM
140T3
M1A M1B
M2A M2B
1µF
10V
0.1µF
10Ω
0.015Ω
0.015Ω
3.3V
0.1µF
105k
1%
33pF
15k
33pF
15k
220pF
220pF
1000pF
1000pF
0.1µF
20k
1%
192.5k, 1%
20k
1%
SENSE2
+
3.3V
OUT
V
OSENSE2
I
TH2
SENSE2
–
SGND
I
TH1
FCB
PLLIN
PLLFLTR
V
OSENSE1
SENSE1
–
SENSE1
+
RUN/SS1
RUN/SS2
BG2
SW2
BOOST2
TG2
PGND
INTV
CC
EXTV
CC
BG1
V
IN
BOOST1
SW1
TG1
PGOOD
21
18
16
17
15
19
20
22
23
24
25
26
27
28
LTC3727LX-1
L1
8µH
L2
8µH
C
OUT1
47µF, 6.3V
C
OUT2
100µF 16V
GND
V
OUT2
8.5V
3A; 4A PEAK
V
OUT1
5V
5A; 6A PEAK
V
IN
10V TO 15V
3727LX1 F13
+ +
27pF
27pF
0.1µF
CMDSH-3
CMDSH-3
PGOOD
V
PULL-UP
(<7V)
C
OUT1
: PANASONIC EEFCDOJ470R
C
OUT2
: SANYO OS-CON 16SVP100M
V
IN
: 10V TO 15V
V
OUT
: 5V, 5A/8.5V, 3A
SWITCHING FREQUENCY = 250kHz
MI, M2: FAIRCHILD FDS6680A
L1, L2: 8µH SUMIDA CDEP134-8R0
14
10
12
11
13
9
8
7
6
5
4
3
2
1
U
TYPICAL APPLICATIO
