DC1897B - Schematic

REVISION HISTORY
ECO
REV
DESCRIPTION
1
PRODUCTION
DATE
APPROVED
11/01/13
TOM G.
INTVCC
C1
2.2uF
10V
R12
OPT
D1
CMDSH-3
E1
CLKOUT
VIN
E3
R11 10
5
6
VIN
ON
R3
14K
R9
150K
RUN
C9
0.1uF
25V
C6
220pF
19
SVIN
20
BOOST
21
INTVCC
22
SW
18
17
16
L1
15
E7
VOUT
2.5V / 3.3V / [email protected]
1uH
14
C8
100pF
13
R2
10.0K
C5
47uF
6.3V
1206
C12
47uF
6.3V
1206
C11
47uF
6.3V
OPT
E9
R13
R4
3.16K
R5
2.21K
R6
1.37K
R7
OPT.
JP1
JP2
JP3
JP4
3.3V
5V
OPT.
2.5V
0
R10
100K
GND
E4
C4
0.1uF
25V
1
3
JP7
ITH
C14 + C10 [1]
22uF
22uF
25V
35V
OPT
C13
22uF
25V
OPT
C7
10pF
2
OFF
SW
7
E8
TRACK
RUN
TRACK
SW
C3
22uF
25V
PGND
DCM (DISCONTINUOUS MODE)
JP6
FB
C2
22uF
25V
E2 4V to 20V
GND
25
4
4
SW
3
FCM (FORCED CONTINUOUS MODE)
SW
12
2
MODE
SW
1
PVIN
11
3
MODE
PHMODE
VIN
C15
0.1uF
25V
PVIN
PGND
2
RT
10
1
SGND
JP5
R15
100K
VOUT
100K
R1
162K
9
4 PHASE
23
3 PHASE
6
CLKOUT
4
5
PGOOD
3
U1
LTC3605AEUF
8
2 PHASE
CLKIN
R14
PHMODE
1
2
24
CLKIN
Vout SELECT
R8
100K
PGOOD
E5
GND
E6
NOTES:
[1]
C10 IS AN OPTIONAL CAPACITOR. IT IS INSERTED
ON THE DC1897A 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.
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.
APPROVALS
TECHNOLOGY
PCB DES. MI
APP ENG. TOM G.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
5A MONOLITHIC SYNCHRONOUS
BUCK REGULATOR
SCALE = NONE
SIZE
IC NO.
N/A
PCB NO.
DATE:
LTC3605AEUF
DEMO CIRCUIT 1897B
11/07/13 10:52:40
SHEET 1
REV.
1
OF 1
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