LTC3867
36
3867f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2011
LT 0711 • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
12V, 4A Output with R
SENSE
Synchronized to 400kHz
PART NUMBER DESCRIPTION COMMENTS
LTC3833 Fast Accurate Step-Down DC/DC Controller with
Differential Output Sensing
Very Fast Transient Response, t
ON(MIN)
= 20ns, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 5.5V, TSSOP-20E, 3mm × 4mm QFN-20
LTC3878/LTC3879 No R
SENSE
™ Constant On-Time Synchronous Step-Down
DC/DC Controllers
Very Fast Transient Response, t
ON(MIN)
= 43ns, 4V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 0.9V
IN
, SSOP-16, MSOP-16E, 3mm × 3mm QFN-16
LTC3775 High Frequency Synchronous Voltage Mode Step-Down
DC/DC Controller
Very Fast Transient Response, t
ON(MIN)
= 30ns, 4V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 0.8V
IN
, MSOP-16E, 3mm × 3mm QFN-16
LTC3854 Small Footprint Synchronous Step-Down DC/DC
Controller
Fixed 400kHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, 2mm × 3mm QFN-12
LTC3851A/LTC3851A-1 No R
SENSE
Wide V
IN
Range Synchronous Step-Down
DC/DC Controllers
PLL Fixed Frequency 250kHz to 750kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
LTC3891 60V, Low I
Q
Synchronous Step-Down DC/DC Controller PLL Capable Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3856 2-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temp Compensation
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 5.25V
LTC3829 3-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temp Compensation
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 5.25V
LTC3855 2-Phase, Dual Output Synchronous Step-Down DC/DC
Controller with Differential Remote Sense
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 12.5V
LTC3860 Dual, Multiphase, Synchronous Step-Down DC/DC
Controller with Diff Amp and Tri-State Output Drive
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
LTC3869/LTC3869-2 2-Phase, Dual Output Synchronous Step-Down DC/DC
Controllers, with Accurate Multiphase Current Matching
PLL Fixed Frequency 250kHz to 780kHz, 4V ≤ V
IN
≤ 30V,
0.6V ≤ V
OUT
≤ 12.5V, 4mm × 5mm QFN-28, SSOP-28
RUN
DIFF
+
DIFF
–
DIFFOUT
V
FB
I
TH
PGND
BG
INTV
CC
V
IN
EXTV
CC
ITEMP
FREQ
MODE/PLLIN
PGOOD
BOOST
TG
SW
IFAST
TKSS
SENSE
+
SENSE
–
I
LIM
ITSD
LTC3867
37.4k
RUN
PLLIN
400kHz
100k
CC
V
OSP
V
OSN
3867 TA04
V
OSP
V
OSN
43k
10Ω
470pF
0.1µF
220µF
16V
V
OUT
12V
4A
L1
6.8µH
R
SENSE
0.011Ω
IN
14V TO 24V
4.7µF
1nF
INTV
CC
SDM10K45
0.1µF
22pF
143k
7.5k
330pF
10Ω
10Ω
M1
M2
10Ω
M1, M2: Si4816BDY
