LTC3851A
30
3851afa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010
LT 0611 REV A • PRINTED IN USA
relaTeD parTs
Typical applicaTion
MODE/PLLIN
FREQ/PLLFLTR
RUN
TK/SS
I
TH
V
FB
SENSE
–
SENSE
+
V
IN
TG
BOOST
SW
INTV
CC
BG
GND
I
LIM
LTC3851A
C
SS
0.1µF
0.1µF
C
B
0.1µF
C
C2
220pF
C
C
470pF
R
FREQ
160k
R
C
33k
R
SENSE
0.01Ω
V
OUT
1.8V
5A
1000pF
4.7µF
+
C
OUT
150µF
6.3V
×2
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
3851A F13
D
B
CMDSH-3
R2
32.4k
1%
R1
25.5k
1%
V
IN
4.5V TO 22V
L1
3.3µH
10Ω10Ω
Figure 13. 1.8V/5A Converter from Design Example with Pulse-Skipping Operation
PART NUMBER DESCRIPTION COMMENTS
LTC3854 Small Footprint Wide V
IN
Range 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
LTC3878 No R
SENSE
™ Constant On-Time Synchronous Step-Down DC/
DC Controller
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
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
LTC3850/LTC3850-1
LTC3850-2
Dual 2-Phase, High Efficiency Synchronous Step-Down DC/DC
Controllers, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed Operating Frequency 250kHz to 780kHz,
4V≤ V
IN
≤ 30V, 0.8V ≤ V
OUT
≤ 5.25V
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz,
4V≤ V
IN
≤ 24V, V
OUT
Up to 13.5V
LTC3610 12A, 1MHz, Monolithic Synchronous Step-Down DC/DC
Converter
High Efficiency, Adjustable Constant On-Time, 4V≤ V
IN
≤ 24V,
V
OUT(MIN)
= 0.6V, 9mm × 9mm QFN-64
LTC3611 10A, 1MHz, Monolithic Synchronous Step-Down DC/DC
Converter
High Efficiency, Adjustable Constant On-Time, 4V≤ V
IN
≤ 32V,
V
OUT(MIN)
= 0.6V, 9mm × 9mm QFN-64
LTC3775 High Frequency Synchronous Voltage Mode Step-Down DC/DC
Controller
Synchronizable Fixed Frequency 250kHz to 1MHz,
t
ON(MIN)
= 30ns, 4V ≤ V
IN
≤ 38V, 0.6V ≤ V
OUT
≤ 0.8V
IN
,
MSOP-16E, 3mm × 3mm QFN-16
