Datasheet

LT3845
26
3845fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
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FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 0110 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT3800 High Voltage Low I
Q
Synchronous Step-Down DC/DC
Controller
Fixed 200kHz Operating Frequency 4V≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V,
I
Q
= 100μA, TSSOP-16
LT3844 High Voltage Low I
Q
Switching Regulator DC/DC Controller Synchronizable Fixed Operating Frequency 100kHz to 600kHz,
4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, I
Q
= 120μA, TSSOP-16
LT3724 High Voltage Low I
Q
Switching Regulator DC/DC Controller Fixed 200kHz Operating Frequency 4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V,
I
Q
= 100μA, TSSOP-16
LTC3812-5 High Voltage Synchronous Step-Down DC/DC Controller 4.2V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 0.9V
IN
, TSSOP-16
LTC3810 100V Synchronous Step-Down DC/DC Controller 6.2V ≤ V
IN
≤ 100V, 0.8V ≤ V
OUT
≤ 0.9V
IN
, SSOP-28
LT3758 100V Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ V
IN
≤ 100V, Selectable Operating Frequency 100kHz to 1MHz
3mm × 3mm DFN-10 and MSOP-10E Package
LT3757 Boost, Flyback, SEPIC and Inverting Controller 2.9V ≤ V
IN
≤ 40V, Selectable Operating Frequency 100kHz to 1MHz
3mm × 3mm DFN-10 and MSOP-10E Package
LTC3824 High Voltage Low I
Q
DC/DC Controller, 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
LTC3834/
LTC3834-1
Low I
Q
, Synchronous Step-Down Controllers 30μA I
Q
, 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V
LTC3835/
LTC3835-1
Low I
Q
, Synchronous Step-Down Controllers 80μA I
Q
, 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V
LTC3857/
LTC3857-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controller with 99% Duty Cycle
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 50μA
LTC3858/
LTC3858-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controller with 99% Duty Cycle
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 170μA,
9V-16V to 3.3V at 5A DC/DC Converter, Frequency Synchronization Range 150kHz to 300kHz,
Capable of Withstanding 60V Transients, All Ceramic Capacitors, Soft-Start and Burst Mode Enabled
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
BOOST
TG
SW
V
CC
BG
PGND
SENSE
+
SENSE
–
SGND
D2 BAS521
C5
1μF
16V
C3
8200pF
M1
Si7850DP
M2
Si7850DP
D1
B160
L1
10μH
R
SENSE
0.01Ω
LT3845
C4
2.2μF
16V
3845 TA04
C2
5600pF
C1
100pF
C
OUT
100μF
6.3V
×4
V
OUT
3.3V
5A
R3
1.1M
V
IN
9V TO 16V
60V TRANSIENTS
C
IN2
0.1μF
100V
R6
130k
SYNC
R4
10k
R5
100k
R1
10k
R2
16.8k
C
IN
2.2μF
100V
×4
C
IN
: TDK C4532X7R2A225K
C
OUT
: MURATA GRM32ER60J107ME20
L1: VISHAY IHLP-5050FD-01
M1, M2: VISHAY Si7850DP