DC1479A - Schematic

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2
3
4
5
6
7
8
REVISION HISTORY
ECO
REV
DESCRIPTION
2
DATE
PROD
08/03/09
APPROVED
CZ
INTVCC
MODE
PS BM CCM
R4
1
2
INTVCC
4
E5
JP3
10K
VIN+
3
E19
R1
A
0
CIN1
180uF
16V
OPT
VFB1
VFB1
+
J2
0
2
R27
SHT 2
VIN
4.5V-14V
VIN
C1
1
SYNC
A
J1
E1
GND
E6
R29
100
VIN-
R30
100
Q1
RJK0305DPB
VIN
S1+ SHT 2
ITH1
RUN1
E9
TRK/SS1
R3
C41
0
R2
0.1uF
R31
C42
15K
220pF
C43
220pF
C44
R34
1nF
0
12K
C
TRK/SS1
ITH1
3
ITH1
ITH2
6
TRK/SS2
7
RUN2
ITH2
TRK/SS2
11
RUN2
SENSE1+
31
SW1
26
TG1
25
BOOST1
24
BG1
23
VIN
22
INTVCC
21
BG2
19
PGND
18
BOOST2
17
5
6
7
8
1
2
3
1nF
VOUT1
S1+
C20
TG1 SHT 2
0.1uF
D1
0
R18
2.2
13
ILIM
TG2
16
20
EXTVCC
SW2
15
SENSE2+
10
0.1uF
R25
GND
VO1-
BG1 SHT 2
C11
4.7uF
BG2 SHT 2
Q3
RJK0305DPB
0
CMDSH-3
VIN
TG2 SHT 2
RUN2
SENSE2-
0.1uF
C15
SW2 SHT 2
VO2+
L2
RS2
J5
1nF
VOUT2
S2S2+ SHT 2
S2-
ILIM
E3
R39
100
EXTVCC
EXTVCC
E13
VL2-
10uF
4
1
2
3
VID11
CIN3
C21
S2+
9
0.47uH
0.002
COUT4
100uF
6.3V
Q4
RJK0330DPB
SHT 2
4
+ COUT5
220uF
4V
+ COUT6
220uF
4V
C36
4.7uF
6.3V
R40
100
1uF
GND
VOUT2
1.2V / 15A
J6
C
GND
E14
C50
E2
B
J4
E12
5
6
7
8
PGOOD
4
vosense2
SHT 2 TRK/SS2
VOUT1
1.5V / 15A
C32
4.7uF
6.3V
+ COUT3
220uF
4V
D2
8
0.1uF
SGND
OPT
14
VID12
C47
5
R37
+ COUT2
220uF
4V
VIN
INTVCC
C17
COUT1
100uF
6.3V
INTVCC
CMDSH-3
VINF
0.002
Q2
RJK0330DPB
4
R9
0.47uH
5
6
7
8
32
J3
1
2
3
SHT 2
RUN1
SENSE1-
5
6
7
8
TRK/SS2
SHT 2
30
2
R35
OPT
R36
FREQ
RS1
ITH2
SHT 2
VOUT1
E10
29
TRK/SS1
1nF
C2
OPT
MODE/PLLIN
VO1+
L1
1
2
3
SHT 2
B
VID21
27
E11
VL1-
4
SW1 SHT 2
C14
vosense1
R7 162K 1%
SHT 2 TRK/SS1
S1-
1
28
12
RUN1
33
SHT 2
CIN2
10uF
LTC3865EUH
VID22
SHT 2 VID21
SHT 2
S1-
U1
SHT 2 VID22
VO2INTVCC
R43
0
VFB2
R46
R33
100K
E4
PGOOD
OPT
PGOOD
SHT 2 VID11
SHT 2 VID12
SHT 2
VFB2
CUSTOMER NOTICE
D
LINEAR TECHNOLOGY HASMADE 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. COMPONENTSUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
NOTES: UNLESS OTHERWISE SPECIFIED,
1. DO NOT APPLY LOAD FROM THE VO1+ TO VO1- OR FROM THE VO2+ TO VO2- TURRETS.
THESE ARE ONLY INTENDED TO KELVIN SENSE THE OUTPUT VOLTAGE ACROSS COUT1
AND COUT4.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USEWITH LINEAR TECHNOLOGY PARTS.
1
2
3
4
5
6
CONTRACT NO.
APPROVALS
PCB DES.
ENG.
TECHNOLOGY
MI
CZ
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
DUAL 15A SYNCHRONOUS BUCK CONVERTER
WITH VIDS
SIZE
IC NO.
LTC3865EUH
DEMO CIRCUIT 1479A
Thursday, December 03, 2009
DATE:
7
REV
2
SHEET
8
1 OF 2
D
5
6
7
8
VIN
SHT 1
SW1
VIN
OPT
Q6
OPT
R26
RUN1
4
BG1
1
2
3
SHT 1
4
1
2
3
TG1
5
6
7
8
SHT 1
CIN4
Q5
OPT
VID11/VID21
VIN
VID12/VID22
VOUT1/VOUT2 (V)
ON
1
2
OFF
3
OPT
RUN1 SHT 1
C38
5
6
7
8
JP1
SW2
SHT 1
BG2
1
2
3
SHT 1
4
Q8
OPT
5.0 (Vin > 5V)
INTVCC
FLOAT
3.3
R28
OPT
OPT
OPT
VIN
5
6
7
8
TG2
INTVCC
2.5
GND
INTVCC
4
R38
1
2
3
SHT 1
CIN5
Q7
OPT
INTVCC
INTVCC
ON
OFF
0.6 or external divider
FLOAT
FLOAT
R64
OPT
1.8
INTVCC
FLOAT
RUN2
FLOAT
GND
1.5
GND
INTVCC
1.2
OPT
1
2
RUN2 SHT 1
3
JP2
C48
R41
OPT
OPT
E16
SHT 1
VID11
VID11
R66
OPT
R42
INTVCC
ILIM
SHT 1
OPT
GND
FLOAT
1.0
GND
GND
1.1
R44
OPT
INTVCC
R63
OPT
E15
SHT 1
R45
SW1
VID21
VID21
S1+ SHT 1
OPT
OPTIONAL DCR SENSING
R65
10K
R47
R49
ITH1
OPT
S1-
SHT 1 S1-
VL1-
R68
OPT
SW2
S2+ SHT 1
SHT 1
OPT
R55
RUN1
S2-
SHT 1 S2-
TRK/SS2
SHT 1
R53
R62
VID12
OPT
R52
TRK/SS1
OPT
OPT
E18
VID12
SHT 1
VFB2
SHT 1
R51
NOTE:
WHEN DCR SENSING IS
IMPLEMENTED, SHORT RSENSE1
AND RSENSE2. DO NOT STUFF
R29,R30,R39 AND R40
OPT
R50
VFB1
OPT
INTVCC
ITH2
SHT 1
R61
SHT 1
OPTIONAL JUMPERS FOR
SINGLE OUTPUT/DUAL PHASE
OPERATION
SHT 1
RUN2
OPT
OPT
VL2-
R70
10K
INTVCC
R67
10K
E17
SHT 1
1
X1
1
X2
1
X3
VID22
VID22
R69
OPT
Represents
Tooling Holes
on PCB
CUSTOMER NOTICE
CONTRACT NO.
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.
APPROVALS
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PCB DES.
ENG.
TECHNOLOGY
MI
CZ
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
DUAL 15A SYNCHRONOUS BUCK CONVERTER
WITH VIDS
SIZE
B
DATE:
IC NO.
LTC3865EUH
REV
DEMO CIRCUIT 1479A
Thursday, December 03, 2009
SHEET
1
2 OF 2
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