DC2339A - Schematic

5
*
4
3
2
1
SEE DEMO MANUAL
PVIN
E1
PVIN
D
J1
+
C4
56uF,50V
50HVT56M
C24
C30
10uF
50V
1210
C2
C1
10uF
50V
1210
SGND
+
C5
56uF,50V
50HVT56M
R1
R33
0
Q1
Q2
BSC035N04LS G
4
0
1
2
3
J2
C25
C31
10uF
50V
1210
SGND
E10
5
E11
7
PWM1
E12
8
E13
9
E14
10
SYNC
E7
R16
82.5K
C18 10nF
R20
100K
R21
100K
R22
100K
R23
100K
R25
11
14
1
31
29
R36
0
VF NEG
PWM1
ISP
ISN
SYNC
PWM_OUT1
FAULT
PWM_OUT2
PWM_OUT3
SS
RT
LED_ISP
D4-1
BAT54A
1
+
C13
OPT
SGND
J4
8
7
5
6
4
2
8
7
5
6
4
VC3
LED_ISN
Si7234DP
21
R12
0
R13
0
27
PWM1
25
PWM2
23
PWM3
D3-1
BAT54A
J5
E5
J3
2
8
7
5
6
4
LED+
LED+
LED+
LED1-
LED2-
LED3-
Q7
Q4
Si7234DP
J6
J7
C
J8
Si7234DP
4
PWM1
Q8
BSC010N04LS
R14
4.02K
PWM2
4
Q9
BSC010N04LS
17
PWM3
R27
1k
16
C19
1nF
4
Q10
BSC010N04LS
15
18
VC2
VC1
R29
25.5K
B
19
VEE
VEE
VEE
VEE
20
37
35
33
R19
309K
3
22
C17
OPT
PWM3
VEE
C29
1nF
24
PWM2
26
R18
309K
C15
OPT
Q6
CTRL3
28
C28
1nF
2
D2
OPT
CTRL2
100K
R17
309K
4
32
CTRL1
FB
13
+
D4-2
BAT54A
3
2
5
6
7
8
4
CTRL2
C10
OPT
1
2
3
2
E6
BAT54A
2
E3
C9
47uF
10V
1206
C16
470uF
CTRLT
BG
1nF
D3-2
C12
470uF
5
6
7
8
6
+
3
C11
470uF
1
2
3
C26
CTRL1
100K
OPT
LED+
KRL6432
5
6
7
8
C
R8
R9
744355182
1
2
3
C14
2.2uF
R7
100K
30
Q3 Q5
BSC026N04LS
VREF
R5
0.003
3
R10
100K
L1
0.82uH
C8
22uF
6.3V
0805
3
R6
100K
34
EN/UVLO
SW
3
C27
1nF
INTVCC
3
E4
C6
0.22uF
1
2
1
EN/UVLO
PWM3
VIN
0805
E8
PWM2
0
D1
PMEG4002EB
BOOST
36
SGND
TG
E16
12
U1
LT3744EUHE
SGND
SGND
CTRL3
R4
E9
C7
1uF
50V
1
R3
100K
3
R2
OPT
E15
1
2
3
SGND
5
6
7
8
VIN
E2
1
*
1
3.3V - 36V
5
6
7
8
D
R30
R31
25.5K 25.5K
C21
C22
C23
10nF
10nF
10nF
R32
0.003
KRL6432
B
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
A
A
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
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1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
N/A
DATE:
IC NO.
HIGH CURRENT SYNCHRONOUS
STEP-DOWN LED DRIVER
LT3744EUHE
DEMO CIRCUIT 2339A
Wednesday, January 14, 2015
1
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