DC857A - Schematic

5
4
3
2
1
HIGH EFFICIENCY
L1
7.7UH
SUMIDA
CDR6D28MN-7R7
U1
LT3481EMSE
D
D1
DFLS240-7
2
1
GND
SANYO
50CV22BS
E11
RUN
SHDN
EXTSS
EXTSS
C
C5
10UF,35V
1206
22UF,50V
5 RUN/SS
JP1
1
2
3
4
C9
0.1UF,50V
0603
E12
D2
DFLS240-7
2
1
+ C13
22UF,50V
C10
0.22UF
C14
1UF,50V
1206
C8
330PF
1
2
3
4
E5
C
1 BD
2 BOOST
RT 10
VC 9
5 RUN/SS
R7
16.9K
FB 8
BIAS 7
R8
127K
R9
383K
PGOOD 6
R10
100K
E7
VOUT
[email protected]
C16
1UF
10V
0603 E9
GND
C15
10UF,10V
0805
R11
19.1K
C17
330PF
B
E10
PGOOD
R12
100K
C18
0.1UF,50V
0603
E14
2MHz BUCK REGULATOR
CUSTOMER NOTICE
A
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
2. INSTALL SHUNT ON JP1 & JP2 PINS 1&2.
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.
CONTRACT NO.
APPROVALS
DRAWN:
4
3
TECHNOLOGY
KIM T.
TITLE:
CHECKED:
ENGINEER: KEVIN H.
DESIGNER:
SIZE
A
DATE:
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SCHEMATIC
800KHz/2MHz BUCK REGULATOR
APPROVED:
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
PGOOD
U2
LT3481EDD
11
SANYO
50CV22BS
RUN
SHDN
EXTSS
EXTSS
R5
19.1K
SMALL SIZE
3 SW
4 VIN
JP2
C6
22UF,10V
1206
800KHz BUCK REGULATOR
SUMIDA
CDRH4D22/HP-2R2
E6
VIN
8.5V-22V
TRASIENT TO 34V
E8
GND
E13
GND
R4
100K
E2
VOUT
[email protected]
C7
1UF
10V
0603 E4
GND
R6
100K
L2
2.2UH
B
GND
+ C4
R2
102K
R3
165K
BIAS 7
PGOOD 6
11
GND
RT 10
VC 9
FB 8
3 SW
4 VIN
E1
E3
1 BD
2 BOOST
GND
VIN
4.5V-34V
C1
0.47UF
D
R1
60.4K
DWG NO.
DC857A-2 * LT3481EMSE/EDD
Tuesday, April 18, 2006
SHEET
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A
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