DC768A - Schematic

5
4
3
2
1
REVISION HISTORY
*
R1
1 Ohm
C1
RUN1
RSD
1.0M
CIN6
VIN
47uF
6.3V
4
5
SW1
6
7
SVIN
BURST VOUT 2
4
PULSE SKIP
6
FORCED CONTINUOUS
C
MODE
8
1
9
3
MODE
5
10
JP7
TP9
CLKIN
11
12
2
ITHM
PVIN
U1
LTC3415EUHF
SW
SW
SW
SW
SW
SW
SW
SW
MODE
PGOOD
CLKIN
BSEL
PHMODE
13
3
5
C9
100pF
(Opt)
VIN
27
CIN4
47uF
6.3V
26
25
RFB1
R4
10K
23
22
21
1
BSEL
3
9
10
MODE
11
SVIN PHMODE2
12
3
C5
47pF
R8
1 Ohm
2
4
6
100K
22pF
20K
1%
RFB3
1.5V
15K
1%
RFB4
1.8V
JP3
C
JP4
TP10
PGOOD
SVIN
VOUT 10%
15%
5%
SW
MODE
PGOOD
CLKIN
BSEL
PHMODE
MGN
2
4
5
6
SVIN
VOUT MGN+
NOMGN
MGN-
JP10
C8
0.1uF
L2
B
0.20uH
R9
IHLP-2525CZ-01 0.20uH
0 Ohm
VISHAY
ITH
SW
MGN
3
ITH
32
33
ITHM
35
34
SVIN
PVIN
PVIN
36
RUN
SW
13
5
SW
SW
PGND
1
SW
SW
PGND
8
U2
LTC3415EUHF
PGND
7
PVIN
SW
R11
CFF
31
COUT4
100uF
6.3V
28
VIN
27
CIN9
47uF
6.3V
26
25
24
R6
10K
(Opt)
23
22
21
20
A
APPROVALS
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
COUT6
(Opt)
FB2
29
JP12
5
COUT5
100uF
6.3V
30
19
6
PVIN
PVIN
18
SW2
PVIN
PGND
5
17
4
FB
PGND
47uF
6.3V
VIN
PLLLPF
PGND
C7
39pF
CIN8
NC
16
10K
C6
100pF
1
SW2
TRACK
PGND
3
JP1
30.1K
1%
(Opt) USER SELECT
20
(Opt)
SGND
15
R5
NC
37
38
2
14
1
TP8
TRACK
SVIN
29.4K
1.2V
1% PbF
JP2
RFB2
24
SVIN2
CLKOUT
B
TP7
GND
R3
FB1
28
RITH2
10K
47uF
6.3V
10K
TP11
CLKOUT2
2 PHASE VOUT 2
4
4 PHASE
6
3 PHASE
29
CITH2
1000pF
(Opt)
CIN7
RUN2
COUT3
(Opt)
JP8
VIN
R7
COUT2
100uF
6.3V
30
ITHM
RUN1
COUT1
100uF
6.3V
31
5
JP9
A
MGN
TP4
ITH
TP6
VOUT
[email protected]
VOUT
L1
ITH
SVIN
34
35
36
PVIN
PVIN
PVIN
PVIN
1
2 PHASE VOUT
4
4 PHASE
6
3 PHASE
37
PVIN
PGND
SVIN PHMODE1
FB
PGND
C4
39pF
ITH
0.20uH
IHLP-2525CZ-01 0.20uH
VISHAY
TRACK
APPROVED
<APPROVED>
!
D
SW1
PLLLPF
PGND
10K
C3
100pF
SGND
PGND
3
DATE
<ECO#> 0
R10
0 Ohm
C2
47pF
RITH1
10K
NC
PGND
2
JP6
R2
NC
16
1
5
RUN
3
PGND
FREE RUN 4
6
-30%
1
15
PLLLPF
CLKOUT
2
14
SVIN
+30%
38
47uF
6.3V
TP5
CLKOUT1
DESCRIPTION
TP3
ITHM
CITH1
1000pF
CIN5
17
TP12
SGND
SVIN
3
OFF
REV
0.1uF
2
32
JP5
Vout Enable
1
ON
33
CINA
68uF
10V
ITHM
+
PGND
CIN3
(Opt)
ON THE DC768A TO DAMPEN THE (POSSIBLE)
RINGING VOLTAGE DUE TO THE LONG INPUT LEADS.
ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, CINA IS
NOT NEEDED.
19
CIN2
100uF
6.3V
18
CIN1
100uF
6.3V
TP2
GND
TP13
GND
D
*CINA IS AN OPTIONAL CAPACITOR. IT IS INSERTED
VIN
TP1
VIN
2.5V to 5.5V
ECO
3
2
DRAWN: Rudy Bautista
ENGINEER: Tom Gross
APPROVED:
Title
Size
CHECKED:
DCxxxA_00.PCB
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
xxxA_x.DSN
www.linear.com
LTC Confidential For Customer Use Only
Dual Phase 15A Monolithic Synchronous Buck Converter
Document Number
Rev
3
Date:
Sheet
1
1
of
1
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