DC993A - Schematic

5
4
3
2
U1
E2
2.5V to 5.5V
+
GND
*
CIN1
22uF
10V
CIN
10uF
6.3V
E5
OFF
3
JP3
C
LTC3542EDC
6
RUN
5
MODE/SYNC
L1
SW
FB
3
VOUT ENABLE
1
ON
2
VIN
VOUT
4
1
2.2uH
VLF3010AT-2R2M1R0
TDK
MODE
1
PULSE
2
BURST
3
JP2
RBM
1.0M
JP4
RFB2
1.2V
150K
1%
JP5
RFB3
1.5V
100K
1%
JP6
D
500mA(max)
COUT1
0.1uF
RFB1
150K
1%
RSD
1.0M
VOUT
E3
COUT
10uF
6.3V
GND
D
2
GND
VIN
GND
CFFW
22pF
25V
7
VIN
1
E4
C
RFB4
1.8V
75K
1%
JP7
RFB5
USER SELECT
SYNC
(Opt)
E1
B
GND
*
B
E6
Capacitor CIN1 is an optional part. It was inserted on the DC993A to dampen the
(possible) ringing voltage due to the long input leads. On a normal, typical PCB,
with short traces, the capacitor is not needed.
A
5
4
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
CONTRACT NO.
APPROVALS
DATE
DRAWN Antonina Karpova 10/05/05
CHECKED
TITLE
LTC3542EDC, Monolithic Synchronous Buck Regulator
APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
Tom Gross
10/05/05
DESIGNER
Friday, September 15, 2006
SIZE CAGE CODE
SCALE:
2
FILENAME:
DWG NO
A
REV
DC993A
2
SHEET
1
1
OF
1
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