Datasheet

LTC3833
36
3833f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 1010 • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
High Frequency 5.5V, 4A, 2MHz Step-Down Converter
R
DIV1
100k
R
DIV2
26.1k
V
IN
V
OUT
EXTV
CC
V
RNG
RUN
SENSE
–
SENSE
+
R
PGD
100k
INTV
CC
R
ITH
20k
R
T
18.2k
C
SS
0.1µF
C
ITH1
220pF
LTC3833
R
FB2
165k
C
FF
22pF
R
FB1
20k
C
OUT1
22µF
×2
L1
1.2µH
R
SENSE
10mΩ
TG
C
B
0.1µF
C
IN1
47µF
35V
3833 TA05
V
IN
7V TO 14V
V
OUT
5.5V
4A
C
IN2
4.7µF
×2
C
VCC
4.7µF
D
B
TRACK/SS
ITH
RT
MODE/PLLIN
PGOOD
SGND
BOOST
SW
INTV
CC
INTV
CC
BG
PGND
V
OSNS
+
V
OSNS
–
R
VIN
2.2Ω
R
F1
10Ω
R
F2
10Ω
C
VIN
0.1µF
MT
MB
C
F
1000pF
C
IN1
: KEMET T521X476M035ATE070
D
B
: DIODES, INC. SDM10K45
L1: WURTH 744313120
MT, MB: INFINEON BSC093N04LS
+
PART NUMBER DESCRIPTION COMMENTS
LTC3878/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
, 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 Controller
Phase-Lockable 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 Temperature
Compensation
Phase-Lockable 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 Temperature
Compensation
Phase-Lockable 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
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V
IN
≤ 38V, 0.6V ≤ V
OUT
≤ 12.5V
LTC3850/LTC3850-1 2-Phase, Dual Output Synchronous Step-Down DC/DC
Controllers, R
SENSE
or DCR Current Sensing
Phase-Lockable Fixed Frequency 250kHz to 780kHz, 4V ≤ V
IN
≤ 30V,
0.8V ≤ V
OUT
≤ 5.25V, 4mm × 4mm QFN-28, 4mm × 5mm QFN-28,
SSOP-28
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing
Phase-Lockable Fixed Frequency 250kHz to 750kHz, 4V ≤ V
IN
≤ 24V,
V
OUT
Up to 13.5V
Efficiency
LOAD CURRENT (A)
20
50
40
30
90
80
70
60
3833 TA05b
EFFICIENCY (%)
0.1
10
1
V
IN
= 12V
V
OUT
= 5.5V
FORCED
CONTINUOUS
MODE
PULSE-
SKIPPING
MODE