DC1458A - Schematic

4
3
OPTIONAL CIRCUIT
C9
0.01UF
0603
L1
6.8UH
D
+ C11
U1
LT3972EMSE
22UF,63V
SANYO
63CE22BS
D1
MBRA340T3
2
1
C1
0.47UF
1
2
3
4
+ C2
C3
4.7UF,50V
1210
22UF,63V
SANYO
63CE22BS
5
R1
63.4K
RT 10
VC 9
BD
BOOST
R2
110K
FB 8
PGOOD 7
SW
VIN
RUN/SS
R3
590K
SYNC 6
R4
100K
11
C
VIN E1
6.3V - 33V
TRANSIENT TO 62V
E8
GND
E2
GND
C10
4.7UF,50V
1210
C8
100PF
RUN
SHDN
EXTSS
EXTSS
JP1
1
2
3
4
C7
0.22UF,50V
0805
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED
2. INSTALL SHUNT ON JP1 AND JP2 PINS 1&2.
C5
0.1UF
50V
0603 E6
R5
15K
E7
C6
1000PF
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.
4
JP2
BURST MODE
SYNC ON
1
2
3
E9
CONTRACT NO.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
C4
47UF,10V
1206
E3
B
A
E5
VOUT
R6
100K
E4
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
1
VISHAY
IHLP-2525CZ-01
TAIYO YUDEN
VISHAY
FB MJ3216HS800 IHLP-2525CZ-01
L2
FB1
10UH
BEAD
D
2
GND
5
3
APPROVALS
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE:
SCHEMATIC
SIZE
DWG NO.
APPROVED:
ENGINEER: KEVIN H.
DESIGNER:
A
DATE:
VOUT
[email protected]
C
GND
PGOOD
GND
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
3.5A, 33V STEP-DOWN SWITCHING REGULATOR
WITH SYNC FUNCTION
DC1458A * LT3972EMSE
Wednesday, September 10, 2008
2
B
SYNC
SHEET
1
A
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A
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