DC1231A - Schematic

5
4
3
2
1
VOUT1
TRK/SS1
0
R4
20.0K
R12
(OPT)
R7
2.49K
C6
10nF
CIN1
4.7uF
25V
10K
C2
1000pF
VOUT1
*
C9 2.2nF
R25 8.2K C11 2.2nF
C12
C18
22pF
1
5
ITH1
VIN
22
INTVCC
21
VFB1
8
VFB2
9
ITH2
1
SENSE2-
BOOST2
18
C15 12
SENSE2+
TG2
17
SW2
16
S2+
RUN2
A
RSENSE
B
DCR
SENSE
RSNS1
0.008
Ohm
(OPT)
10
Ohm
(OPT)
1
8
7
C
R21 2.2
TG2
BG2
Q2A
4
VSW2
1
*
J2
VOUT2
*
SUMIDA
CDEP85-2R4MC-50
RSNS2
COUT4
22uF
6.3V
2
2
COUT3
220uF
4V
VOUT2
[email protected]
E8
C17
1uF
6.3V
COUT6
(OPT)
GND
E10
FDS6982AS
D3
C19
0.1uF
L2R23*
L2 2.4uH
C14
0.1uF
Q2B
R36 0
S2+
VSW2
R38
R37
(OPT)
0
INTVCC
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
INTVCC
VIN
CIN5 (OPT)
VINF
Customer Notice
CIN6 (OPT)
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.
R41
C7
J1
R6
R13
R17
10
Ohm
1nF
(OPT)
(OPT)
(OPT)
(OPT)
(OPT)
0.1uF
SHORT
3.01K
20.0k
0 Ohm
RSNS2
0.008
Ohm
(OPT)
R29
10
Ohm
(OPT)
R26
TG1
Stuff R41 with 0 Ohms for
4.5V < Vin < 5.5V
C15
J2
R23
R22
10
Ohm
1nF
(OPT)
(OPT)
(OPT)
(OPT)
0.1uF
SHORT
3.01K
0 Ohm
TG2
VSW1
1
7
6
5
BG1
R27
Q3
Si4816BDY
(OPT)
4
(OPT)
VSW2
1
7
6
5
BG2
Q4
Si4816BDY
4
(OPT)
4
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
Title
20.0k
OPTIONAL MOSFETS & CIN
5
GND
CIN2
4.7uF
25V
VINF
C13
4.7uF
VOUT1
[email protected]
1
VIN
D1
OFF
R14
COUT5
(OPT)
JP2
RUN2
PHASE2
R11
0
2
DESC
E4
C5
1uF
6.3V
R33
100K
PHASE1
U1
COUT2
22uF
6.3V
COUT1
220uF
4V
B
(OPT)
A
R16
3
C20
(OPT)
*
J1
VOUT1
PGOOD
3
R34
(OPT)
RSNS1
SUMIDA
CDEP85-2R4MC-50
ON
2
E11
*
L1 2.4uH
E6
INTVCC
2
INTVCC
SGND
GND
E3
L1-
8
RUN2
PGND
19
Q1B
*
2
3
RUN2
20
11
ILIM
R32
(OPT)
BG2
TK/SS2
*
C4 0.1uF
INTVCC
10
R40
VOUT2 0
VIN
27
28
FREQ
23
7
R30
43.2K
24
BG1
R29
OFF
BOOST1
TK/SS1
3
C16
(OPT)
*
R27
25
LTC3850EGN
BG1
8
R39
(OPT)
*
ON
2
E9
JP1
RUN1
TG1
SENSE1+
4
TRK/SS2
*
RUN1
B
*
R22
R26
R24
(OPT)
RUN1
L2-
330pF
26
SENSE1-
6
E12
SW1
3
TRK/SS1
R20 20.0k
VIN
R6
3
R17
C7
R19 20.0k
ILIM
ILIM
220pF
R15 10K
VSW1
5
6
E13
C
VSW1
D
1
C8
*
L1-
2
*
*
R13
PGOOD
R9
63.4K
R14
PGOOD
CIN4
22uF
35V
15
4
C3
22pF
*
MODE
R11
RUN1
S1+
FCC
PGOOD
1
BURST
3
C10
(OPT)
U1
ILM
2
E7
R35
0
PULSE SKIP
14
R18 0
MODE
JP3
SYNC
RUN1
RUN2
SYNC
SYNC
Q1A
VIN
6.5V - 24V
E1
S1+
4
R3
0
13
1
INTVCC
VIN
FDS6982AS
TG1
2
C1
(OPT)
D
E5
VIN
INTVCC
R2
8 3
7
E2
FSW = 400KHz, Type
R10
TRK/SS1
5
6
R1
43.2K
TRK/SS2
TRK/SS2
3
2
Dual Output, Dual Phase 5A Synchronous Buck Converter
Size
Document Number
Date:
Thursday, December 13, 2007
Demo Circuit 1231A-A/B LTC3850EGN
Sheet
1
1
of
1
Rev
A
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