LT3845A
26
3845afa
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 1110 • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT3800 60V, Low I
Q
, Single Output Synchronous Step-Down
DC/DC Controller
Fixed 200kHz Operating Frequency
4V≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16
LTC3844 60V, Low I
Q
, Single Output Step-Down DC/DC Controller Synchronizable Fixed Frequency 50kHz to 600kHz,
4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16
LT3724 60V, Low I
Q
, DC/DC Controller Multi Topology Fixed 200kHz Operating Frequency
4V ≤ V
IN
≤ 60V, 1.23 ≤ V
OUT
≤ 36V, I
Q
= 100µA, TSSOP-16
LT3741 High Power, Constant Current, Constant Voltage,
Synchronous, Step Down Controller
Adjustable Fixed Frequency 200kHz to 1MHz
6V ≤ V
IN
≤ 36V, V
OUT
Up to (V
IN
–2)
LTC3824 60V, Low I
Q
, Step-Down DC/DC Controller,
100% Duty Cycle
Selectable Fixed Frequency 200kHz to 600kHz
4V≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ V
IN
, I
Q
= 40µA, MSOP-10E
LTC3834/LTC3834-1
LTC3835/LTC3835-1
Low I
Q
, Single Output Synchronous Step-Down DC/DC
Controller with 99% Duty Cycle
Phase-Lockable Fixed Frequency 140kHz to 650kHz,
4V≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V, I
Q
= 30µA/80µA
LTC3890 60V, Low I
Q
, Dual 2-Phase Synchronous Step-Down
DC/DC Controller
Phase-Lockable Fixed Frequency 50kHz to 900kHz
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3857/LTC3857-1
LTC3858/LTC3858-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controllers with 99% Duty Cycle
Phase-Lockable Fixed Frequency 50kHz to 900kHz,
4V≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA/170µA
LTC3859 Low I
Q
, Triple Output Buck/Buck/Boost Synchronous
DC/DC Controller
All Outputs Remain in Regulation Through Cold Crank
2.5V≤ V
IN
≤ 38V, V
OUT(BUCKS)
Up to 24V,
V
OUT(BOOST)
Up to 60V, I
Q
= 55µA
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
LT3845A
C4
2.2µF
16V
3845A 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
