5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
[1]
ASSY RSNSE R9, R10
-A
-B
3m OHM
10 AWG WIRE
10 OHM
DO NOT STUFF
DO NOT STUFF
0.1uF 50V X7R
KEEP PARTS CLOSE
IN DASHED BOX
DO NOT STUFF
0 OHM
R43R27 R29 C18
DO NOT STUFF DO NOT STUFF
3.01K 1% 30.1K 1%
DESC
RSENSE
DCR SENSE
VIN
SW
ILIM
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
VOUT
VOUT
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
PROTO3
09/25/07
3.1
CHANGED C21, C22, R31, U1 12/02/10
DING L.
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
PROTO3
09/25/07
3.1
CHANGED C21, C22, R31, U1 12/02/10
DING L.
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
PROTO3
09/25/07
3.1
CHANGED C21, C22, R31, U1 12/02/10
DING L.
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
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET
OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
DESIGNER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
3.1
DC1171A
Friday, March 04, 2011
1
1
B
SCH, LTC3851AEGN, SYNCHRONOUS BUCK
1171A-3.1.DSNNONE
MI 10/10/01
RSENSE / DCR SENSE CONVERTER
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET
OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
DESIGNER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
3.1
DC1171A
Friday, March 04, 2011
1
1
B
SCH, LTC3851AEGN, SYNCHRONOUS BUCK
1171A-3.1.DSNNONE
MI 10/10/01
RSENSE / DCR SENSE CONVERTER
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET
OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
DESIGNER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
3.1
DC1171A
Friday, March 04, 2011
1
1
B
SCH, LTC3851AEGN, SYNCHRONOUS BUCK
1171A-3.1.DSNNONE
MI 10/10/01
RSENSE / DCR SENSE CONVERTER
R10 [1]R10 [1]
C23
OPT
C23
OPT
C24
0.1uF 10V
C24
0.1uF 10V
CIN3
10uF
25V
CIN3
10uF
25V
J4
GND
J4
GND
C26
2200pF
C26
2200pF
+
CIN1
150uF
35V
+
CIN1
150uF
35V
C32
OPT
C32
OPT
COUT3
47uF
6.3V
COUT3
47uF
6.3V
D1
B340A
D1
B340A
2 1
J2
GND
J2
GND
R37 10R37 10
C18 [1]C18 [1]
E4
MODE/PLLIN
E4
MODE/PLLIN
L1
0.68uH
L1
0.68uH
1
2
R41
0
R41
0
R30
82.5K 1%
R30
82.5K 1%
E2
TRK/SS
E2
TRK/SS
R40
6.8K
1%
R40
6.8K
1%
E8
GND
E8
GND
Q4
OPT
Q4
OPT
3
1
2
4
5
C30
1000pF
C30
1000pF
J1
4.5V-14V
VIN
J1
4.5V-14V
VIN
C22
10nF
C22
10nF
R38
49.9K
1%
R38
49.9K
1%
+
COUT1
330uF
4V
+
COUT1
330uF
4V
J3
1.5V/15A
VOUT
J3
1.5V/15A
VOUT
RSNSE
[1]
RSNSE
[1]
C25
0.1uF
10V
C25
0.1uF
10V
R36 0R36 0
CIN4
10uF
25V
CIN4
10uF
25V
U1 LTC3851AEGNU1 LTC3851AEGN
MODE/PLLIN
1
FREQ/PLLFLTR
2
RUN
3
TK/SS
4
ITH
5
FB
6
SENSE-
7
SENSE+
8
ILIM
9
GND
10
BG
11
INTVCC
12
VIN
13
BOOST
14
TG
15
SW
16
JP3
MODE/PLLIN
CCM
P.S.BURST
JP3
MODE/PLLIN
CCM
P.S.BURST
1
2
3
4
C27 2.2uF
10V
C27 2.2uF
10V
D2
CMDSH-3
D2
CMDSH-3
21
C28
330pF
C28
330pF
JP1
FREQ/PLLFLTR
400K EXTCLK
JP1
FREQ/PLLFLTR
400K EXTCLK
1
2
3
C20
0.1uF 10V
C20
0.1uF 10V
R31
1K
R31
1K
R43 [1]R43 [1]
R32
0
R32
0
C29
20pF
C29
20pF
R9 [1]R9 [1]
R28 OPTR28 OPT
E6
GND
E6
GND
Q3
RJK0301DPB
Q3
RJK0301DPB
3
1
2
4
5
R29 [1]R29 [1]
Q1
RJK0305DPB
Q1
RJK0305DPB
3
1
2
4
5
Q2
OPT
Q2
OPT
3
1
2
4
5
E1
RUN
E1
RUN
JP2
RUN
OFFON
JP2
RUN
OFFON
1
2
3
R39
43.2K
1%
R39
43.2K
1%
E7
VOUT
E7
VOUT
C31
4.7uF
10V
C31
4.7uF
10V
+
COUT2
330uF
4V
+
COUT2
330uF
4V
C19
1uF
C19
1uF
R42 0R42 0
E5
VIN
E5
VIN
R27
[1]
R27
[1]
C21
1nF
C21
1nF
R35
OPT
R35
OPT
