LTC3835
30
3835fe
LINEAR TECHNOLOGY CORPORATION 2008
LT 0215 REV E • PRINTED IN USA
For more information www.linear.com/LTC3835
RELATED PARTS
TYPICAL APPLICATION
Figure 11. High Efficiency Step-Down Converter
V
OUT
3.3V
5A
C
OUT
150µF
0.01µF
IN
4V TO
36V
M1
M2
I
TH
SGND
PLLIN/MODE
V
FB
SENSE
+
SENSE
–
CLKOUT
PLLLPF
RUN
PGOOD
TRACK/SS
INTV
CC
EXTV
CC
BG
PGND
LTC3835
L1
3.3µH
0.012Ω
68.1k
3835 TA06
100pF
1200pF
10k
215k
M1, M2: Si7848DP
L1: CDEP105-3R2M
4.7µF
D
B
CMDSH-3
C
B
0.22µF
TG
V
IN
BOOST
SW
C
IN
10µF
39pF
PART NUMBER DESCRIPTION COMMENTS
LTC3891 60V, Low I
Q
Synchronous Step-Down DC/DC Controller with
99% Duty Cycle and Low 95ns Minimum On-Time
PLL Capable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3834/
LTC3834-1
Low I
Q
, Synchronous Step-Down DC/DC Controller with 99%
Duty Cycle
PLL Fixed Operating Frequency 140kHz to 900kHz,
4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 10V, I
Q
= 30µA
LTC3824 60V, Low I
Q
DC/DC Controller with 100% Duty Cycle Selectable Fixed Operating Frequency 200kHz to 600kHz,
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ V
IN
, I
Q
= 40µA, MSOP-10E
LT3845A 60V, Low I
Q
Synchronous Step-Down DC/DC Controller Adjustable Fixed Operating Frequency 100kHz to 500kHz,
4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16E
LTC3890/
LTC3890
-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down DC/DC
Controller
PLL Fixed Operating Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3857/
LTC3857-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down DC/DC
Controller
PLL Fixed Operating Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA, Overcurrent Foldback
LTC3858/
LTC3858-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down DC/DC
Controller
PLL Fixed Operating Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 170µA, Overcurrent Latchoff
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
Controller
PLL Fixed Operating Frequency 250kHz to 750kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
LTC3827/
LTC3827-1
Low I
Q
, Dual Synchronous Controller 2-Phase Operation; 115µA Total No Load I
Q
, 4V ≤ V
IN
≤ 36V 80µA
No Load I
Q
with One Channel On
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3835
