DC1901A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
1
DESCRIPTION
APPROVED
DATE
PRODUCTION
CHARLIE Z.
12-19-12
D
D
VIN
U1
LTC3639EMSE
VIN
4V - 150V
E1
+
C1
22uF
200V
R1
2M
JP3
RUN
1
ON
R2
OPT
3
C2
1uF
200V
2220
2
14
OFF
GND
L1
VIN
SW
VFB
RUN
220uH
CDRH105R
12
VPRG1
OVLO
1
7
R4
OPT
C3
OPT
SS
C9
0.1uF
VOUT
1.8V / 3.3V / 5V
100mA
GND
E3
B A
C
1
2
6
JP2
*
*
10
GND
NC
NC
NC
NC
OPT
E5
2
4
13
15
FBO
ISET
JP1
C4
47nF
17
11
VIN
FBO
GND
GND
R8
VPRG2
8
16
5
C8
OPT
1210
R7
OPT
*
2
3
R3
0
C6
100uF
10V
1210
9
3
E4
R6
0
B A
3
C
E2
1
VOUT
JP1
JP2
1.8V
B
B
3.3V
A
B
5.0V
B
A
EXT. R
A
A
B
B
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
2. FOR 5V OUTPUT, VIN RANGE IS 6V-150V.
CUSTOMER NOTICE
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.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
TECHNOLOGY
LE T.
CHARLIE Z. TITLE: SCHEMATIC
5
4
3
LTC3639EMSE
DEMO CIRCUIT 1901A
IC NO.
N/A
SCALE = NONE
A
HIGH EFFICIENCY, 150V, 100mA SYNCHRONOUS STEP-DOWN CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
Wednesday, December 19, 2012
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