DC1798A - Schematic

1
2
3
4
5
6
7
8
REVISION HISTORY
ECO
REV
__
R10
0
TRK/SS1
DESCRIPTION
1
PRODUCTION
APPROVED
YI S.
DATE
1-17-11
TRK/SS1
E1
R12
(OPT)
A
C6
10nF
VIN
A
VIN
*
R13
C7
C8
220pF
R25
8.2K
R32
(OPT)
6
4
R20
20.0k
1
2
3
E10
R34
(OPT)
C20
(OPT)
10
8
*
R26*
L2-
C18
22pF
11
*
*
R27
R29
1
2
3
4
BG2
VOUT1
E5
3
8
7
R16
0
*
J1
COUT2
22uF
6.3V
1206
COUT1
220uF
4V
POSCAP
C5
1uF
6.3V
VOUT1
3.3V / 5A
COUT5
(OPT)
POSCAP
E6
GND
24
23
VINF
R21
10
CIN2
4.7uF
50V 1206
VIN
22
C14
0.1uF
21
TG2
7
18
RUN2
RUN2
*
*
VOUT2
E8
*
L2
2.4uH
CDEP85-2R4MC-50
2
17
RSNS2
COUT4
22uF
6.3V
1206
COUT3
220uF
4V
POSCAP
C17
1uF
6.3V
VOUT2
2.5V / 5A
COUT6
(OPT)
POSCAP
E9
GND
C19
0.1uF
VSW2
SW2
J2
Q2B
FDS6982AS
SENSE2+
SGND
L2-
VSW2
0805
R36
0
TG2
12
INTVCC
D3
BOOST2
B
Q2A
FDS6982AS
R23
19
TK/SS2
SENSE2-
S2+
BG2
20
C13
4.7uF
ITH2
*
JP3
MODE
C10
(OPT)
INTVCC
VFB2
VOUT2
E11
VIN
VFB1
INTVCC
SYNC
1
ITH1
C15
S2+
SYNC
BG1
PGND
9
R40
0
R18
0
27
TK/SS1
TRK/SS2
R22
R30
63.4K
*
RSNS1
Q1B
FDS6982AS
25
4
ON
OFF
BOOST1
L1-
L1
2.4uH
CDEP85-2R4MC-50
2
INTVCC
JP2
RUN2
RUN2
5
R19
20.0k
C12
330pF
RUN2
26
*
TRK/SS1
R17
C11
2.2nF
VIN
SENSE1-
R6
3
OFF
C16
(OPT)
MODE
TG1
C9
2.2nF
B
SW1
BG1
8
7
ON
*
L1-
VSW1
GND
1
R15
10K
C4
0.1uF
2
1
2
3
D1
1
JP1
RUN1
RUN1
28
*
3
E3
1
*
Q1A
FDS6982AS
5
6
R9
90.9K
R14
R39
(OPT)
4
VIN
4.5V - 26V
CIN4
22uF
35V
S1+
SENSE1+
PGOOD
C3
22pF
VIN
2
FREQ
S1+
*
E7
TG1
VSW1
RUN1
R35
0
R11
R24
(OPT)
SYNC
1
U1
LTC3869IGN-2
RUN1
RUN1
INTVCC
2
VOUT1
EXTVCC
R4
(OPT)
E4
16
INTVCC
R33
100K
15
C1
10nF
TRK/SS2
14
R1
(OPT)
FSW = 400KHz,
TYPICAL
13
TRK/SS2
R7
100K
E2
5
6
VOUT1
CIN1
4.7uF
50V 1206
PGOOD
PULSE SKIP
E12
C21
0.1uF
BURST
FCC
E13
EXTVCC
C
C
CIN5
(OPT)
VINF
VIN
TG1
CIN6
(OPT)
TG2
8
R41
(OPT)
8
INTVCC
VSW1
1
VSW2
1
7
6
5
7
6
5
BG2
(OPT)
3
2
PHASE1
PHASE2
Q4
Si4816BDY
4
2
Q3
Si4816BDY
(OPT)
4
3
BG1
OPTIONAL MOSFETS & CIN
*
ASST
DESC
RSNS1
R11
R14
-A
RSENSE
0.006
Ohm
10
Ohm
10
Ohm
1nF
(OPT)
(OPT)
(OPT)
-B
DCR
SENSE
(OPT)
(OPT)
0.1uF
SHORT
3.92K
4.99k
D
(OPT)
C7
J1
R6
R13
R17
C15
J2
R23
RSNS2
R29
R26
(OPT)
0.006
Ohm
10
Ohm
10
Ohm
1nF
R22
(OPT)
(OPT)
(OPT)
0 Ohm
(OPT)
(OPT)
(OPT)
0.1uF
SHORT
3.92K
0 Ohm
R27
(OPT)
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.
4.99k
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS ARE 0603
APPROVALS
PCB DES.
HZ
APP ENG.
YI S.
TECHNOLOGY
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
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N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DUAL OUTPUT, DUAL PHASE 5A
SYNCHRONOUS BUCK CONVERTER
IC NO.
LTC3869IGN-2
DEMO CIRCUIT 1798A-A/B
REV.
1
DATE: Wednesday, June 29, 2011
7
SHEET 1
8
OF 1
D
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