LT3840
Typical applicaTion
Inverting Application, 24V Input to –15V, 10A
V
IN
18V TO 36V
1µF
C
68µF
×2
IN
L2, 33µH
1M
AUXBST AUXSW1 AUXSW2
INTV
V
IN
CC
4.7µF
1µF
1N4448
AUXVIN
EN
BOOST
80.6k
LT3840
UVLO
OVLO
PG
M1
M2
TG
SW
BG
R
SENSE
5mΩ
L1, 15µH
D1
C
10µF
×2
C
OUT2
330µF
×2
OUT1
SYNC
MODE
RT
V
–15V
10A
OUT
+
SENSE
–
V
SENSE
C
110k
TK/SS
FB
39.2k
33nF
M1: INFINEON, BSC160N10NS3
M2: INFINEON, BSC070N1ONS3
L1: WÜRTH, 7443631500
L2: COILCRAFT, ME3220-333KL
D1: DIODES INC. PDS5100H
GND
10k
2200pF
49.9k
IMON
2200pF
ICOMP
7.68k
470pF
ICTRL
100pF
3840 TA05
V
OUT
–15V
relaTeD parTs
PART NUMBER DESCRIPTION
COMMENTS
Synchronizable Fixed Frequency 100kHz to 600kHz, 4V ≤ V ≤ 60V,
LT3845A
60V, Low I , Single Output Synchronous Step-Down
Q
IN
DC/DC Controller
1.23V ≤ V
≤ 36V, I = 120µA, TSSOP-16 Package
OUT Q
LT3844
60V, Low I , Single Output Step-Down DC/DC Controller
Synchronizable Fixed Frequency 50kHz to 600kHz, 4V ≤ V ≤ 60V,
IN
Q
1.23V ≤ V
≤ 36V, I = 120µA, TSSOP-16 Package
Q
OUT
LTC3864
LTC3891
60V, Low I , Step-Down DC/DC Controller 100% Duty
Selectable Fixed Frequency 200kHz to 600kHz, 3.5V ≤ V ≤ 60V,
IN
Q
Cycle Capability
0.8V ≤ V
≤ V , I = 40µA, MSOP-10E Package
OUT IN Q
60V, Low I , Synchronous Step-Down DC/DC Controller
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V ≤ 60V,
IN
Q
0.8V ≤ V
≤ 24V, I = 50µA
Q
OUT
LTC3890/
LTC3890-1/
LTC3890-2
60V, Low I , Dual 2-Phase Synchronous Step-Down
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V ≤ 60V,
IN
Q
DC/DC Controller
0.8V ≤ V
≤ 24V, I = 50µA
OUT Q
LTC3859A
Low I , Triple Output Buck/Buck/Boost Synchronous
All Outputs Remain in Regulation Through Cold Crank, 2.5V ≤ V ≤ 38V,
IN
Q
DC/DC Controller
V
Up to 24V, V
Up to 60V, I = 27µA
OUT(BUCKS)
OUT(BOOST) Q
LT8705
30V V and V
Synchronous 4-Switch Buck-Boost
Synchronizable Fixed Frequency 100kHz to 400kHz, 2.8V ≤ V ≤ 80V,
IN
IN
OUT
Controller
1.3V ≤ V
≤ 30V, Four Regulation Loops
OUT
3840fa
LT 0814 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
24
For more information www.linear.com/LT3840
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT3840
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LINEAR TECHNOLOGY CORPORATION 2014
Linear [ Linear ]
