DC1576A - Schematic

5
4
3
2
REVISION HISTORY
NOTE: UNLESS OTHERWISE SPECIFIED
ECO
REV
__
1. ALL RESISTORS ARE 0805.
ALL CAPACITORS ARE 0805.
D
+VIN
1
DESCRIPTION
2
APPROVED
PRODUCTION
GORAN P.
DATE
05-10-10
D
R1
OPT.
4
2
1
R2
3.3K
E1
VIN
5V - 30V
3
CIN3
CIN2
CIN4
6.8uF
50V
XR7
+ CIN1
Q1
FZTA42
100uF
35V
E2
L1A
4.7uH
DRQ127-4R7
R3
38.3K
CC1
100pF
C
D1
PDZ7.5B
R4
182
2
CSS
0.1uF
3
1
GND
1
+VIN
CDC2
CDC1
6.8uF
50V
D2
+VO
BAS516
1
2
D3
PDS760
+VO
2
1
3
4
5
SSFLT
GATE
exposed pad,
solder side
Ith
FB
Vcc
OC
RUN
Isense
FS
SYNC
9
B
R7
1K
R13
0
8
7
GND
1/2W
2010
C2
OPT,
*
R11
OPT.
CVCC
4.7uF
25V
R14
0
E5
PAD
B
*
*
TECHNOLOGY
JW
GORAN P.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
LOW NOISE SEPIC DC/DC CONVERTER
IC NO.
LTC3805IMSE-5
DEMO CIRCUIT 1576A
N/A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SEE QUICK START GUIDE.
APPROVALS
SIZE
4
16V
APXE
E4
R10
1K
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.
5
COUT4
+150uF
6
CUSTOMER NOTICE
A
R8
0.005
COUT3
COUT1
COUT2
33uF
16V
XR7
2
2
3
L1B
4.7uH
DRQ127-4R7
10
11
R5
113K
R6
8.06K
R9
12.1K
RT
80.6K
4
R12
0
1
+VO
Q2
RJK0653DPB
U1
LTC3805IMSE-5
RC1
56.2K
GND
CC2
1nF
C
+VO
12V / 3A
E3
SCALE = NONE
3
DATE:
05-10-2010
2
SHEET 1
1
A
REV.
2
OF 1
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