DC1820A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
C6
2.2uF 50V
E1
REV
DESCRIPTION
4
PROD
APPROVED
DATE
YAN L.
09/21/12
SVIN
SVIN
0805
R2
2
EXTVCC
C8
E2
2
3
OFF
R3
100k
15
JP1
6
PG
SW
COILCRAFT
XAL5030-472
8
COUT1
4.7uF
16V
1210
MODE/SYNC
VON
COUT2
10uF
16V
1210
VOUT
[2]
C9
1uF
0805
C
5
RT
C3
5.6pF
INTVCC
R4
3
ITH
OPT
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL RESISTOR AND CAPACITOR CASE SIZE ARE 0603.
C4
OPT
VFB
E3
2
R10
137k
1%
R11
84.5k
1%
C5
100pF
GND
5V
R7
60.4k
1%
GND
R12
619k
1%
4
4
R9
200k
1%
B
VOUT
2
R5
OPT
E4
L1 4.7uH
11 SW
3
R6
OPT
JP2
12
1
FCC
GND
E7
3.3V
6
7
D1
DFLS1200
OPT
PGND
5
EXTVCC
C1
4.7uF
17
3
E8
INTVCC
SGND
E10
BURST
1
SYNC
NC
4 SYNC
EXTVCC
D
JP5
13
14
PGOOD
MODE / SYNC
2
6
VOUT
C2 0.1uF
RUN
C
1
5
INTVCC
BOOST
INTVCC
GND
INTVCC
E9
PGOOD
VOUT
4
OPT
EXTVCC
ON
[3]
16
INTVCC
2
3
U1
1
SVIN
GND
RUN
1
E6
10
E5
CIN3
10uF
50V
1210
PVIN
CIN2
10uF
50V
1210
9
+ CIN1
OPT
0805
1uF
C7
PVIN
VIN
[2]
EXTVCC
VIN
INTVCC
D
E11
B
JP3
[2]
VOUT SELECT
VIN
VOUT
4.5V - 40V
3.3V / 1A
7V - 40V
5V / 1A
CUSTOMER NOTICE
[3]
VERSION
IC
A
-A
LTC3646EMSE
-B
LTC3646EMSE-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
4
3
N/A
SCALE = NONE
A
HIGH EFFICIENCY LOW QUIESCENT
CURRENT STEP-DOWN CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
LTC3646EMSE/LTC3646EMSE-1
DEMO CIRCUIT 1820A-A/B
10/04/12 10:31:04
2
SHEET 1
1
REV.
4
OF 1
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