LT3724
26
3724fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2005
LT 0311 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
Inverting –12V 1.5A Converter
C
C2
680pF
C
C1
120pF
R6, 40.2k
C
SS
1000pF
R
CSS
200k
R2
10.2k
R1
88.7k
0.1µF
0.1µF
16V
1µF
16V
R3
2M
V
IN
18V TO 36V
V
IN
SHDN
C
SS
V
FB
V
C
GND
BOOST
TG
SW
V
CC
PGND
SENSE
+
SENSE
–
+
+
V
OUT
–12V
1.5A
C
OUT1
330µF
16V
C
IN1
220µF
50V
L1
47µH
M1
D2
D1B
D1A
R
SENSE
0.040Ω
D1 = BAV99
D2 = ON SEMI, MBRD350
L1 = COEV, DU1311-470M
M1 = VISHAY, Si7370DP
C
IN1
= SANYO, 50CV220KX
C
OUT1
= SANYO, 16SVP330M
3724 TA05
LT3724
4
1
3
6
7
8
16
15
14
11
10
9
12
PART NUMBER DESCRIPTION COMMENTS
LT3845A 60V, Low I
Q
, High Voltage Synchronous
Step-Down DC/DC Controller
Adjustable Fixed Frequency 100kHz to 500kHz, 4V≤ V
IN
≤ 60V, 1.23V ≤
V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16
LTC3891 60V, Low I
Q
, High Voltage 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
LT3844 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
LT3741 High Power, Constant Current, Constant Voltage,
Step-Down Controller
Fixed 200kHz to 1MHz Operating Frequency, ±6% Current Regulation,
6V≤ V
IN
≤ 36V, V
OUT
Up to (V
IN
- 2V)
LTC3824 60V, Low I
Q
, Step-Down DC/DC Controller with
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
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
