LTC3851
28
3851fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0409 REV B • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC3727A-1 Dual, 2-Phase Synchronous Controller Very Low Dropout, V
OUT
≤ 14V
LTC3728 2-Phase 550kHz, Dual Synchronous Step-Down Controller QFN and SSOP Packages
LTC3729/
LTC3729L-6
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
LTC3810 100V Current Mode Synchronous Nonisolated Switching
Regulator Controller
6.2V ≤ V
IN
≤ 100V, 0.8V ≤ V
OUT
≤ 0.9V
IN
, No R
SENSE
,
Tracking and Synchronizable
LTC3811 Dual, PolyPhase Synchronous Step-Down Controller, 20A to 200A Differential Remote Sense Amplifi er, R
SENSE
or DCR Current
Sense
LTC3826/LTC3826-1 Low I
Q
Dual Synchronous Step-Down Controllers 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V, 30µA Quiescent Current
LTC3834/LTC3834-1 Low I
Q
Synchronous Step-Down Controllers Single Channel LTC3826/LTC3826-1
LT
®
3845 Low I
Q
Synchronous Step-Down Controller 4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, 120µA Quiescent Current
LTC3850/LTC3850-1/
LTC3850-2
Dual, 2-Phase Synchronous Step-Down Controller R
SENSE
or DCR Current Sensing, Tracking and Synchronizable
LTC3853 Triple Output, Multiphase Synchronous Step-Down Controller R
SENSE
or DCR Current Sensing, Tracking and Synchronizable
LTC3878 No R
SENSE
Wide Input Range Constant On-Time Synchronous
Step-Down Controller
Up to 97% Effi ciency, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ (0.9)(V
IN
), I
OUT
Up to 20A
LTM4600HV 10A Complete Switch Mode Power Supply 92% Effi ciency, V
IN
: 4.5V to 28V, True Current Mode Control,
Ultrafast™ Transient Response
LTM4601AHV 12A Complete Switch Mode Power Supply 92% Effi ciency, V
IN
: 4.5V to 28V, True Current Mode Control,
Ultrafast Transient Response
PolyPhase is a registered trademark of Linear Technology Corporation. No R
SENSE
and Ultrafast are trademarks of Linear Technology Corporation.
MODE/PLLIN
FREQ/PLLFLTR
RUN
TK/SS
I
TH
V
FB
SENSE
–
SENSE
+
V
IN
TG
BOOST
SW
INTV
CC
BG
GND
I
LIM
LTC3851
C
SS
0.1µF
0.1µF
C
B
0.1µF
C
C2
220pF
C
C
470pF
R
FREQ
160k
R
C
33k
R
SENSE
0.01
V
OUT
1.8V
5A
1000pF
4.7µF
+
C
OUT
150µF
6.3V
s2
PANASONIC SP
C
IN
22µF
25V
M1A
FDS6982S
M1B
FDS6982S
C
OUT
: PANASONIC EEFUEOG151R
C
IN
: MARCON THCR70LE1H226ZT
L1: PANASONIC ETQP6F3R3HFA
R
SENSE
: IRC LR 2010-01-R010F
3851 F13
D
B
CMDSH-3
R2
32.4k
1%
R1
25.5k
1%
V
IN
4.5V TO 22V
L1
3.3µH
+
1010
Figure 13. 1.8V/5A Converter from Design Example with Pulse Skip Operation
