DC1731A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
C6
2.2uF 50V
E1
REV
DESCRIPTION
APPROVED
DATE
3
PROTO
YAN L.
09/21/12
SVIN
SVIN
0805
R2
2
EXTVCC
C8
E2
VIN
VIN
VOUT
4
GND
5
6
EXTVCC
ON
2
3
OFF
R3
100k
13
JP1
11
INTVCC
RUN
E9
BOOST
6
PG
PGOOD
SW
C
9
COILCRAFT
XAL5030-472MEB
FCC
JP2
R5
OPT
VOUT
[2]
C9
1uF
0805
R6
4
OPT
R7
60.4k
1%
VON
C
5
RT
C3
5.6pF
INTVCC
R4
3
ITH
OPT
R9
200k
1%
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL RESISTOR AND CAPACITOR CASE SIZE ARE 0603.
C4
OPT
VFB
GND
R12
619k
1%
E3
2
R10
137k
1%
R11
84.5k
1%
C5
100pF
GND
5V
6
4
5
MODE/SYNC
COUT2
10uF
16V
1210
INTVCC
3
SYNC
COUT1
4.7uF
16V
1210
2
4
E4
VOUT
3.3V
3
7
GND
E7
L1 4.7uH
SW
PGND
E10
BURST
C1
4.7uF
10
15
SYNC
2
SGND
1
EXTVCC
C2 0.1uF
MODE / SYNC
1
INTVCC
D1
DFLS1200
OPT
1
PGOOD
E8
INTVCC
12
1
D
E6
EXTVCC
RUN
VOUT
JP5
U1
[3]
14
GND
E11
B
JP3
[2]
VOUT SELECT
VIN
VOUT
4.5V - 40V
3.3V / 1A
7V - 40V
5V / 1A
CUSTOMER NOTICE
[3]
A
2
3
INTVCC
8
E5
CIN3
10uF
50V
1210
EXTVCC
SVIN
CIN2
10uF
50V
1210
0805
1uF
C7
PVIN
+ CIN1
OPT
B
1
OPT
[2]
INTVCC
D
VERSION
IC
-A
LTC3646EDE
-B
LTC3646EDE-1
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. MI
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. YAN L.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
4
3
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
HIGH EFFICIENCY LOW QUIESCENT
CURRENT STEP-DOWN CONVERTER
IC NO.
REV.
LTC3646EDE / LTC3646EDE-1
DEMO CIRCUIT 1731A-A/B
10/04/12 10:19:29
2
SHEET 1
1
3
OF 1
A
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