LTC3829
40
3829fc
For more information www.linear.com/LTC3829
LINEAR TECHNOLOGY CORPORATION 2010
LT 1114 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3829
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3855 Dual, Multiphase, Synchronous DC/DC Step-Down Controller
with Differential Remote Sense
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 12.5V
LTC3860 Dual, Multiphase Step-Down DC/DC Controller with Differential
Remote Sense and Accurate Current Share
Works with DRMOS and Power Blocks for High Current
Applications
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 750kHz Frequency,
4V ≤ V
IN
≤ 24V, V
OUT3
Up to 13.5V
LTC3850/LTC3850-1
LTC3850-2
Dual 2-Phase, High Efficiency Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 780kHz Frequency,
4V ≤ V
IN
≤ 30V, 0.8V ≤ V
OUT
≤ 5.25V
LTC3854 Small Footprint Wide V
IN
Range Synchronous Step-Down DC/
DC Controller, R
SENSE
or DCR Current Sensing
Fixed 400kHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, 2mm × 3mm QFN-12
LTC3851/LTC3851-1 No R
SENSE
™ Wide V
IN
Range Synchronous Step-Down DC/DC
Controller, RS
ENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 750kHz Frequency,
4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5.25V, MSOP-16E,
3mm × 3mm QFN-16, SSOP-16
LTC3775 High Frequency Synchronous V
oltage Mode Step-Down
DC/DC Controller
Fast T
ransient Response, t
ON(MIN)
= 30ns, 4V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 0.8V
IN
, MSOP-16E, 3mm × 3mm QFN-16
LTC3878 No R
SENSE
Constant On-Time Synchronous Step-Down DC/DC
Controller, No R
SENSE
Required
Very Fast Transient Response, t
ON(MIN)
= 43ns, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 0.9V
IN
, SSOP-16
LTC3879 No R
SENSE
Constant On-Time Synchronous Step-Down DC/DC
Controller, No R
SENSE
Required
Very Fast Transient Response, t
ON(MIN)
= 43ns, 4V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 0.9V
IN
, MSOP-16E, 3mm × 3mm QFN-16
TYPICAL APPLICATION
1.2V/60A Triple Phase Converter with Active Voltage Positioning, f
SW
= 400kHz, R
DROOP
= 1.33mΩ
+
+
INTV
CC
EXTV
CC
I
TEMP
BOOST1
BOOST2
BOOST3
RUN
I
LIM
MODE
FREQ
I
TH
TK/SS
SENSE1
+
SENSE1
–
PGND
BG1
SW1
TG1
4.7µF
SW3 SW2 SW1
100k
75Ω
100Ω
0.1µF
220pF
10k
20k
20k
22µF
35V
×3
V
IN
6V TO 14V
C
OUT1
330µF
4V
×6
C
OUT2
100µF
6.3V
×6
V
OUT
1.2V
60A
SENSE2
+
SENSE2
–
BG2
SW2
TG2
SENSE3
+
SENSE3
–
BG3
CLKOUT
IFAST
SW3
TG3
SGND
DIFFOUT
AVP
ISET
V
FB
DIFFN
DIFFP
PGOOD
0.3µH
V
IN
V
IN
0.001Ω
0.3µH
0.001Ω
0.3µH
3829 TA03
0.001Ω
V
IN
LTC3829
