DC1149A - Schematic

5
4
3
2
1
SUMIDA
CDRH8D43-6R8
L1
6.8UH
D
D
U1
LT3680EMSE
GND
4
+ C2
C3
4.7UF,50V
1210
22UF,50V
E8
SANYO
50CE22BS
5
BD
BOOST
VIN
RUN/SS
JP1
R2
110K
FB 8
PGOOD 7
SW
E2
RUN
SHDN
EXTSS
EXTSS
2
R1
63.4K
RT 10
VC 9
R3
590K
SYNC 6
1
2
3
4
C4
47UF,10V
1206
VOUT
[email protected]
C5
0.1UF
50V
0603 E6
GND
E7
R5
15K
C8
100PF
E3
C7
0.22UF,50V
0805
PGOOD
GND
JP2
BURST MODE
SYNC ON
1
2
3
E9
SYNC
B
B
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
A
C
C6
1000PF
R6
100K
E4
E5
R4
100K
11
C
1
3
VIN E1
6.3V - 36V
GND
C1
0.47UF
GND
D1
MBRA340T3
2
1
2. INSTALL SHUNT ON JP1 AND JP2 PINS 1&2.
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE:
SCHEMATIC
SIZE
DWG NO.
APPROVED:
ENGINEER: KEVIN H.
DESIGNER:
A
DATE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
A
3.5A, 36V STEP-DOWN SWITCHING REGULATOR
WITH SYNC FUNCTION
DC1149A * LT3680EMSE
Thursday, August 09, 2007
2
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