DC1237A - Schematic

5
U1
2
7
D1
OPT
SW2
SW1
VOUT1
16
2
E3
*
C11
2.2uF
16V
0603
6
2
PGOOD2
E7
13
1
2
4
6
8
SHDN1
R2
1M
E6
PGOOD1
REG1
12
FB1
2
VOUT2
C8
OPT
SGND
11
1
3
5
7
OFF
ON
SEQ.
EXT
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
2. INSTALL SHUNTS ON JUMPERS AS SHOWN.
JP3 FIXED
FREQ.
AUTO
BURST
1
2
3
JP4
E5
GND
R6
357k
VOUT2 SELECT
VOUT2
R8
221k
C9
10uF
10V
0805
C10
1uF
10V
E8
E9
VOUT2
1.8V/2.85V/3.3V
GND
R9
90.9k
ASSY
-A
2.2MHz
1.2MHz
CUSTOMER NOTICE
3
B
-B
U1
LTC3527EUD
LTC3527EUD-1
CONTRACT NO.
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.
4
C7
1uF
10V
VOUT1
3V/3.3V/5V
* FOR ASSEMBLY
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
C6
10uF
10V
0805
E4
R10
249k
14
GND
FSEL
17
3
10
MODE
OFF
ON
SEQ.
EXT
R5
61.9k
REG2
3
2
1
VOUT1
JP8
HD2X3-079
R7
124k
SHDN2
JP6
HD2X4-079
A
VOUT1 SELECT
2
4
6
8
B
1
8
SHDN2
FB2
2
C
R4
249k
SHDN1
D
JP7
HD2X3-079
R3
374k
PGOOD2
E10
D4
OPT
C5
OPT
1
3
5
7
JP5
HD2X4-079
D2
OPT
5
R1
1M
C
1
4
SUMIDA
CDRH2D18/HP
L2
3.3uH
2 3.0V
4 3.3V
6 5V
1
D3
OPT
L1
3.3uH
SUMIDA
CDRH2D18/HP
1
3
5
VOUT2
VIN
VIN1
C3
4.7uF
10V
0603
JP2
VIN 15
OPT
3216
VIN2
9
+C2
VIN
SINGLE
JP1
E12
PGOOD1
1
2 1.8V
4 2.85V
6 3.3V
E2
C4
4.7uF
16V
0805
VIN2 VIN1
1
3
5
INPUTS
PARALLEL
1
2
3
3
2
1
OPT
3216
VIN2
GND
+C1
E11
VIN2
0.7V - 5.5V
2
VIN1
1
D
3
E1
VIN1
0.7V - 5.5V
GND
4
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER: FRAN H.
DESIGNER:
TECHNOLOGY
KIM T.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
A
DUAL SYNCHRONOUS BOOST CONVERTER
SIZE
A
DATE:
DWG NO.
DC1237A-1 * LTC3527EUD/-1
Monday, May 04, 2009
2
SHEET
1
REV
A-1
1 OF 1
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