DC1254A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
0
DATE
PROTO
APPROVED
xx/xx/07
INTVCC
MODE
1
PULSE SKIP
2
BURST MODE/SYNC
VIN
FORCED CONTINUOUS
E7
MODE
3
INTVCC
4
VIN
JP4
R40
R48
10.0K
1%
SYNC
0
E9
E11
INTVCC
R41
(Opt)
R47
3.16K
1%
1
RUN1
2
RUN2
R43
(Opt)
1
RUN2
3
OFF
R44
(Opt)
C42
(Opt)
JP2
R1
43.2K
1%
R38
0
1
TK/SS3
2
9
R3
24.9K
1%
VIN
E13
RUN3
R2
20K
1%
C2
(Opt)
R45
(Opt)
RUN3
C1
10pF
40
TK/SS2
VOUT2
2
TK/SS2
10
220pF
12
SW1
BG1
VFB1
ITH1
TG2
VFB2
BG2
R8
INTVCC
C44
(Opt)
R6
20K
1%
TG3
PGOOD12
BG3
SENSE3-
PGOOD3
SW3
SENSE3+
16
220pF
R9
CMDSH-3
TG1
D2
R28
25
C25
0.1uF
0
CMDSH-3
27
SW2
28
INTVCC
56
22
S2N
Q3B
Si4816BDY
BG2 4
R10
2.2
VOUT2
E3
RSNS2
7
29
C11
4.7uF
16V
0805
S2P
L2
1.5uH
RLF7030T-1R5N6R1
0.008
5%
R54
(Opt)
COUT3
22uF
6.3V
X5R
R56
(Opt)
+ COUT4
220uF
4V
4TPE220MF
GND
R55
24
D3
R29
18
C26
0.1uF
0
CMDSH-3
(Opt)
C10
0.1uF
25V
SENS2N
SENS2P
TG2
19
20
SW2
BG2
VIN
BG2
21
CIN5
4.7uF
25V
8
C21
C22
C23
1000pF
1000pF
1000pF
SENS3N
SW3
R26
S3P
S3N
L3
2.2uH
RLF7030T-2R2M5R4
56
Q5B
Si4816BDY
BG3 4
VOUT3
E5
RSNS3
7
10
R25
B
Q5A
Si4816BDY
TG31
10
0.008
5%
R57
(Opt)
COUT5
22uF
6.3V
X5R
R59
(Opt)
+
COUT6
220uF
4V
4TPE220MF
VOUT3
3.3V / 5A
C49
1uF
6.3V
X5R E6
GND
23
R58
R24
C45
(Opt)
(Opt)
S2N
SENS3N
10
TG3
SENS3P
SW3
OPT DCR SENSE3
R23
10
SENS1N
BG3
INTVCC
C46
0.01uF
R61
100K
A
S1N
INTVCC
10
R62
100K
SENS1P
TG3
SW3
BG3
OPTIONAL DCR SENSING
R22
TK/SS3
R36
(Opt)
TG2
SW2
OPT DCR SENSE2
S2P
0
VOUT2
1.8V / 5A
C48
1uF
6.3V
X5R E4
23
S3P
TK/SS3
BG1
C
Q3A
Si4816BDY
TG2 1
SENS3P
R35
SW1
BG1
CIN3
4.7uF
25V
8
26
SENS2P
E16
TG1
VIN
30
SENS2N
R34
20K
1%
SENS1N
31
TK/SS2
TK/SS2
GND
32
18K
R33
24.9K
1%
VOUT1
2.5V / 5A
C47
1uF
6.3V
X5R E2
SW1
S3N
1500pF
220uF
4V
4TPE220MF
OPT DCR SENSE1
C24
0.1uF
0
C8
C9
R53
(Opt)
+ COUT2
8
C3
10pF
VOUT3
E15
PGOOD3
11
R32
20K
1%
17
EXTVCC
7
R5
63.4K
1%
TK/SS1
PGOOD12
BOOST3
SENSE2-
E14
23
SGND
R31
43.2K
1%
TK/SS1
EXTVCC
R39
0
ITH3
6
VOUT3
VIN
SENSE2+
15
VFB3
5
1500pF
14
VOUT3
B
33
VINF
12K
SENSE1-
220pF
DRVCC12
ITH2
4
C7
R46
(Opt)
13
SENSE1+
C43
(Opt)
JP3
C6
PGND
3
OFF
R4
20K
1%
RUN3
2
R51
(Opt)
COUT1
22uF
6.3V
X5R
D1
VIN
1
ON
E1
0.008
5%
34
RUN3
35
37
36
RUN1
RUN2
TG1
TK/SS3
SW2
18K
7
SENS1P
R7
1500pF
VOUT1
R52
R27
BOOST1
U1
LTC3853EUJ
S1N
RSNS1
(Opt)
BOOST2
C4
C5
TK/SS1
41
C
TK/SS1
MODE
R37
0
RUN2
RUN2
ILIM
VIN
E12
38
R50
(Opt)
56
23
RUN3
VOUT1
E8
GND
L1
1.5uH
RLF7030T-1R5N6R1
BG1 4
RUN1
R42
(Opt)
C41
(Opt)
JP1
ON
1
Q1B
Si4816BDY
MODE
39
3
OFF
R49
0
FREQ
RUN1
ON
TG1
SW1
RUN1
D
+
S1P
C50
1000pF
R63
0
VIN
CIN7
22uF
35V
CIN1
4.7uF
25V
Q1A
8
Si4816BDY
3
D
VIN
6.5V - 24V
NOTE: When DCR sensing is implemented short RSNS1, RSNS2,
RSNS3 and do not populate R21, R22, R23 , R24 , R25
and R26.
R21
S1P
A
10
EXTVCC
C40
0.1uF
E10
EXTVCC
(5.5Vmax)
5
PGOOD12
E17
PGOOD12
PGOOD3
APPROVALS
E18
PGOOD3
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 customers 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.
4
3
2
DRAWN: Rudy Bautista
ENGINEER:
Johan Strydom
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
Title: LTC3853EUJ
Date:
LTC Confidential For Customer Use Only
Polyphase 3-Output Step-Down Supply with Tracking
APPROVED:
CHECKED:
www.linear.com
SD
Document Number
Rev
Demo Circuit 1254A
Tuesday, September 09, 2008 C:\ORCADWIN\CAPTURE\1319A\1254A_REV3.DSN
1
Sheet
3
1
of
2
5
4
3
2
1
D
D
OPTIONAL MOSFETS
VIN
Q2A
FDS6982AS
56
VIN
CIN2
(Opt)
56
Q4A
FDS6982AS
VIN
CIN4
(Opt)
Q6A
FDS6982AS
56
CIN6
(Opt)
C
C
4
TG1
TG2
3
SW1
Q2B
FDS6982AS
78
3
3
SW3
78
Q4B
FDS6982AS
Q6B
FDS6982AS
2
BG2
4
TG3
SW2
2
BG1
4
2
BG3
1
78
1
1
B
B
INTVCC
VINF
R60
0603
(Opt)
APPROVALS
DRAWN: Rudy Bautista
4.5V < VIN < 5.5V
ONLY
A
ENGINEER: Johan Strydom
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
Title:
Date:
5
4
Wednesday, July 09, 2008
3
LTC Confidential For Customer Use Only
LTC3853EUJ
Polyphase 3-Output Step-Down Supply with Tracking
APPROVED:
CHECKED:
www.linear.com
SD
Document Number
Demo Circuit 1254A
Sheet
C:\ORCADWIN\CAPTURE\1254A\1254A_00_REV3.DSN
2
Rev
1
3
2
of
2
A
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