DC1487A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
1
DESCRIPTION
2
APPROVED
DATE
JIAN L.
11-16-09
PRODUCTION
1
VIN
D
D2
BAS16HT1
(OPT)
SOD-323
2
R1
(OPT)
E1
VIN
R11
(OPT)
VIN
1
11
R5
20K
C6 1nF
R6
R10
42.2K
7
BOOST
FB
VIN
SENSE-
INTVCC
SENSE+
BG
GND
4
R3
10
9
5
6
7
8
C4
0.1uF
50V
0
R4 VIN
4.7
8
C10
4.7uF
16V
CIN1
100uF
50V
GND
VIN-
E6
1uH
RS1
C
0.002
R9
49.9
E8
Q4
(OPT)
COUT1 + COUT2 +
220uF
47uF
4V
6.3V
4
R7
(OPT)
Q2
BSC035N04LSG
VOUT+
E7
PG0006
102NL
INTVCC
D1
SD103AWS
CIN5
(OPT) +
E4
L1
4
C8
0.1uF
50V
13
C9
(OPT)
(OPT)
12
ITH
CIN4
4.7uF
50V
5
6
7
8
2
CIN3
4.7uF
50V
R13
49.9
VOUT
[email protected]
COUT3 COUT4
220uF
(OPT)
4V
1206
E9
1
2
3
4.7nF
6
CIN2
4.7uF
50V
Q3
(OPT)
1
2
3
5.1K C3
C
4
5
6
7
8
R2
SW
5
1
2
3
470pF
TG
RUN/SS
1
C2
3
BSC093N04LSG
4
2
C1
0.1uF
50V
3
OFF
Q1
VIN
4.5V - 34V
E3
1
2
3
LTC3854EMSE
2
5
6
7
8
U1
1
JP1
RUN
ON
C11
(OPT)
VIN+
E2
GND
RUN/SS
D
R8
(OPT)
E10
GND
VOUT-
R12
0
B
B
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.
A
APPROVALS
PCB DES.
HZ
JIAN L.
APP ENG.
TECHNOLOGY
TITLE: SCHEMATIC
HIGH EFFICIENCF STEP-DOWN CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
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
SCALE = NONE
2
IC NO.
REV.
LTC3854EMSE
2
DEMO CIRCUIT 1487A
DATE: Monday, February 22, 2010
SHEET 1
1
OF 1
A
Similar pages