DC1273A - Schematic

5
4
3
2
1
D
D
L1
4.7uH
VISHAY
1HLP2525CZER4R7M01
C6
22uF,10V
U1
LT1938EDD
4.5V - 25V
E1
+
GND
C5
10uF,35V
C4
22uF,50V
SANYO
50CV22BS
VIN
E3
BD
RT
10
9
2
BOOST
VC
3
SW
FB
4
VIN
BIAS
7
PGOOD
6
5
RUN/SS
1
RUN
2
SHDN
3
EXTSS
R1
60.4K
R5
19.1K
E4
C8
680pF
VOUT
3.3V @ 2.2A
GND
C
8
R3
165K
R2
102K
R4
100K
11
VIN
C1
0.47uF
GND
D1
DFLS230L
2
1
C
1
C7
1uF
10V
E2
R6
100K
E5
PGOOD
C9
0.1uF,50V
4
JP1
B
B
EXTSS
GND
E8
E7
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
CONTRACT NO.
APPROVALS
TITLE:
CHECKED:
APPROVED:
ENGINEER: KEVIN H.
DESIGNER:
4
3
SIZE
DATE:
2
LT1938EDD
2.2A, 25V Step-Down Switching Regulator
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
DRAWN: Antonina K
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DWG NO.
REV
DC1273A
A
Friday, June 29, 2007
SHEET
1
1 OF 1
A
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