DC1822A - Schematic

A
B
C
D
E
REVISION HISTORY
VIN
ECO
__
SNS1+
25
C7
SNS1- R21
0.22uF
SNS2R22
C8
SNS2+
0.22uF
24
23
22
21
2
VDRV
1
3
SMOD#
41
4
GND
BOOT
6
5
GH
CGND
8
7
PHASE
9
42
NC
35
34
33
COUT4
COUT5
100uF
6.3V
1210
32
R20
2.87K
1%
31
VSWH
+
E13
VOUT1+
1.5V / 25A
VOUT1-
U2
J4
R18
10
R26 1
VOS13
SMOD#
VCIN
VDRV
BOOT
GL
PGND
VSWH
PGND
VSWH
U3
FDMF6820A
PGND
VSWH
VSWH
VSWH
40
R38
2.87K
1%
39
38
37
L2
0.47uH
SW2
36
VOS2+
R39
10
VOUT2
35
34
COUT9
COUT10
100uF
6.3V
1210
WURTH EL.
744355147
33
32
31
VSWH
PGND
PGND
R31
OPT
1
2
3
41
GND
CGND
4
6
5
GH
VSWH
PGND
R30
10K
+
2
E8
COUT6 J5
COUT7
COUT8
330uF
2.5V
J6
R43
10
30
20
CGND
VSWH
R41
VIN
29
19
THWN
VSWH
17
DISB#
VIN
PGND
16
VIN
43
15
CIN6
22uF
16V
1210
PWM
28
CIN5
22uF
16V
1210
C35
16V
DISBL#2 THDN2
VIN
PGND
13
2.2uF
R29
10K
E12
VOS2+
VOUT2+
1.2V / 25A
VOUT2VOS2-
VOS2-
R45
18.2K
1%
2
RUN2
1
JP2
J3
VIN
1
3
COUT1
COUT2
COUT3
330uF
2.5V
2.2
PGND
12
OPT
R42
OPT
RUN2
OFF
VOS1+
E4
R11
10
VOUT1
30
VSWH
29
VSWH
PGND
43
PGND
PGND
28
27
PGND
PGND
26
25
PGND
24
PGND
SW1
R44
100K
PGOOD2
ON
R25
27
11
SW2
18
VCC
VOS1+
L1
0.47uH
744355147
WURTH EL.
36
VSWH
0.22uF C11
2.2uF
16V
R28
OPT
R37
34.0K
1%
VCC
VIN
C9
21
E11
CLKOUT
VIN-
E2
5VBIAS
R24
53.6k
1%
VCC
R40
OPT
E10
CLKOUT
J2
19
FSWITCH = 500kHz TYPICAL
GND
4
VIN-
E6
14
E9
7V - 14V
VOS1-
CLKIN
CLKIN
VIN+
J1
CIN2
180uF
16V
38
VSWH
26
2
+
0
0
R35
OPT
C12
OPT
CIN1
OPT
SVP F8
ILIM2
20
R34
OPT
+
37
VSWH
PGND
PHASE
VCC
PGND
R7
OPT
39
VSWH
U2
FDMF6820A
PGND
R6
10K
27
PWM2
C10
OPT
PGND
PGND
29
30
PWMEN1
32
33
31
PGOOD1
IAVG
34
VINSNS
CONFIG
PWM1
RUN2
VSWH
PGND
FB2
PGND
24
FB2
TRK/SS2
0 R33
OPT
ILIM2
GL
7
R32
SGND
COMP2
VSWH
NC
E7
R27
OPT
VSNSP2
CGND
10
TRACK/SS2
9.31k
C1-2
1.5nF
ISNS2P
GND
R2-2
280
VOUT1
10
ISNS2N
VSNSN2
37
R3-2
COMP2
ISNS1N
VSNSOUT2
THWN
PGND
C2-2 100pF
20
DATE
12-14-11
VIN+
E1
DISBL#1 THDN1
VIN
23
9
C3-2 3.3nF
17
18
26
PWM2
8
VSNSOUT1
ISNS1P
PWMEN2
10.0K
0
R1-2 10.0K
16
MIKE S.
40
PWM
VIN
28
18
7
VSNSN1
17
6
U1
LTC3861EUHE
PGOOD2
RT-2
R23
VOS2-
ILIM1
SGND
16
RB-2 10k
RUN1
VSNSP1
PHSMD
4
5
VOS2+
15
CIN4
22uF
16V
1210
R17
53.6k
1%
COMP1
15
3
CLKOUT
2
10.0K
CLKIN
VOS1-
RB-1
FB1
14
1
VOS1+
RT-1 15.0K
35
36
C1-1
COMP1
1.5nF
VCC
C2-1
100pF
ILIM1
CIN3
22uF
16V
1210
FB1
13
R19
0
3
10.0K
R1-1
9.76k
R15
OPT
19
TRACK/SS1
3.3nF
R2-1
280
R13
0
C5
OPT
FREQ
R3-1
C4
OPT
14
8
C6
1uF
1
C3-1
VCC
R16
TRACK/SS2
R14
OPT
13
VIN
5VBIAS
12
0
11
E5
R10
OPT
PWM1
R9
0
C34
2.2uF
16V
DISB#
PGND
TRK/SS1
R12
APPROVED
VIN
R5
10K
VIN
23
12
IAVG
TRACK/SS1
R3 1
VIN
22
VIN
11
SW1
42
E3
VCC
21
PGOOD1
VIN
R8
100K
VIN
4
10
R73
0
VIN
OPT
VCC
DESCRIPTION
PRODUCTION
R2 2.2
0.22uF
C3
2.2uF
16V
R72
22
VCC
9
R4
10k
1%
C2
OPT
JP1
VIN
3
OFF
REV
2
5VBIAS
C1
VCIN
RUN1
2
PGND
1
ON
25
R1
18.2K
RUN1
C13
OPT
R46
10k
1%
VOUT1
VOUT1
A
CUSTOMER NOTICE
OPTIONAL COMPONENTS FOR SINGLE OUTPUT DUAL PHASE APPLICATIONS
R47 OPT
VOUT2
R36
OPT
2010
VOUT2
2010
TRK/SS1 TRK/SS2
VCC
COMP1
COMP2 RUN1
RUN2
R48
R53
R54
OPT
OPT
OPT
B
FB1
R49 OPT
FB2
R51 OPT
VCC
R50
R52
ILIM1
OPT
ILIM2
OPT
C
IAVG
C14
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.
D
APPROVALS
PCB DES.
APP ENG.
A.K.
MIKE S.
TECHNOLOGY
TITLE: SCHEMATIC
HIGH CURRENT DUAL OUTPUT
SYNCHRONOUS BUCK CONVERTER
SIZE
LTC3861EUHE
DEMO CIRCUIT 1822A
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
Monday, May 14, 2012
REV.
2
SHEET 1
E
OF 3
1
A
B
C
D
HEADER/SOCKET TO PARALLEL DC1822A TO ANOTHER DC1822A
OPTIONAL POWER BLOCK
TEMP2+
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
7VBIAS
TEMP2-
E14
R55
R74
R75
0
0
RUN1
15
SNS2+
TRACK/SS1
14
SGND
+CSA
PWM2
SGND
1
-CSA
CLKIN
12
PWMA
11
10
PWMB
9
VINB
2
3
3
4
4
5
5
6
6
TRK/SS1
RUN1
COMP1
7
8
COMP2
IAVG
MILL MAXX
802-40-008-20-001000
COUT13 COUT22 COUT23
100uF + 330uF + 330uF
6.3V
2.5V
2.5V
1210
COUT14
100uF
6.3V
1210
+
COUT24
330uF
2.5V
DYNAMIC LOAD CIRCUIT FOR VOUT1
Q1
SUD50N03-12P
C22
C28
10uF
0805
1uF
GND
2
OFF
3
1
2
6
BOOST
SHDN
NC
FB
R59
33uH
C19
0
22uF 1206 C18
1uF
16V
1210
5
E22
E25
INT BIAS
5V / 200mA
CLKOUT
MILL MAXX
803-43-008-20-001000
8
R61
604K
VOUT2
VOUT2
Q2
SUD50N03-12P
J7
C29
10uF
0805
PULSE GEN2
E20
GND
R58
10k
1%
E23
J10
3
ISTEP2+
R60 E21 LOAD STEP
0.010
10mV / Amp
1%
2010
ISTEP2E24
UVLO CIRCUIT
RUN1 RUN2
GND
7
C21
22pF
R63
2
D1
BAV170
SOT23
5VBIAS
R66
OPT
200k
4
JP3
BIAS
L3
0.22uF
16V
SW
SGND
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
5VBIAS
3
1
ON
VIN
GND
3
C26
1uF
E18
TEMP1-
BIAS SUPPLY FOR LTC3861 AND DRMOS
INT BIAS
SGND
1
TEMP1+
2
SGND
DYNAMIC LOAD CIRCUIT FOR VOUT2
ISTEP1+
R57 E17 LOAD STEP
0.010
10mV / Amp
1%
2010
ISTEP1E19
R56
10k
1%
E27
E26
C17
4
RUN2
VOUT1
PULSE GEN1
R62
U4
LT3470ETS8
VIN
TRACK/SS2
VOUT1
7
-CSB
OPT
COMP2
VOUT1
16
7VBIAS
8
CLKOUT
CLKIN
E16
0
7
RUN2
TRK/SS2
IAVG
C16
6
GND
+CSB
1
5
VOUTB
0
R77
COUT17
330uF VOUT2
2.5V
1
2
7VBIAS
4
+7V
SNS1R76
COUT16
330uF
2.5V
4.7uF 0805
8
SNS1+
COUT15
330uF
2.5V
2
PWM1
CIN10
22uF
16V
1210
GND
TEMPB
CIN9
22uF
16V
1210
3
VOUTA
+
VIN
CIN8
22uF
16V
1210
2
GND
COUT11
100uF
6.3V
1210
+
CIN7
22uF
16V
1210
VINA
COUT12
100uF
6.3V
1210
+
13
3
SGND
TEMPA
SNS2-
IAVG
COMP1
1uF
PB1
D12S1R845A
DC/DC Converters
J9 RIGHT ANGLE
SOCKET
J8
RIGHT ANGLE HEADER
E15
C15
OPT
4
E
VOUT1
R65
THDN1
OPT
R67
THDN2
OPT
VOUT2
R82
OPT
R83
OPT
OPTIONAL BIAS SUPPLY FOR POWER BLOCK
VIN
3
PWR BLK BIAS C20
1 1uF
ON
2
3
OFF
JP4
1
2
VIN
6
SHDN
NC
SW
BIAS
FB
7VBIAS
0.22uF
L4
R64
16V
33uH
C25 0
22uF 1206 C24
1uF
16V
1210
5
E28
PWR BLK BIAS
7V / 200mA
CUSTOMER NOTICE
7
8
R69
953K
C27
22pF
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
R71
200k
4
1
C23
BOOST
U5
LT3470ETS8
GND
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
D
A.K.
MIKE S.
TECHNOLOGY
TITLE: SCHEMATIC
HIGH CURRENT DUAL OUTPUT
SYNCHRONOUS BUCK CONVERTER
SIZE
LTC3861EUHE
DEMO CIRCUIT 1822A
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
Wednesday, March 28, 2012
REV.
2
SHEET 2
E
OF 3
1
A
B
C
D
E
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 1
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
VIN
D2
4
R79
8
6
5
PWM1
C30
0.22uF
BOOST
7
TS
VLOGIC
BG
IN
Q4
BSC050NE2LS
5
4
CIN11
22uF
16V
1210
5
CIN12
22uF
16V
1210
4
4
1 2 3
1 2 3
SW1
1
TG
VCC
2
Q5
BSC010NE2LS
3
4
GND
C31
2.2uF
16V
Q3
BSC050NE2LS
CMDSH-3
U8
LTC4449EDCB
5VBIAS
R78
2.2
0
Q6
BSC010NE2LS
5
4
5
4
GND
1 2 3
1 2 3
9
3
3
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 2
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
VIN
D3
R80
8
7
2
6
5
PWM2
BOOST
C32
0.22uF
TG
VCC
TS
VLOGIC
BG
IN
C33
2.2uF
16V
GND
GND
Q7
BSC050NE2LS
CMDSH-3
U9
LTC4449EDCB
5VBIAS
R81
2.2
0
5
Q8
BSC050NE2LS
4
5
CIN13
22uF
16V
1210
CIN14
22uF
16V
1210
4
1 2 3
1 2 3
1
SW2
2
3
4
Q9
BSC010NE2LS
5
Q10
BSC010NE2LS
4
5
2
4
1 2 3
1 2 3
9
1
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
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.
A
B
C
D
A.K.
MIKE S.
TECHNOLOGY
TITLE: SCHEMATIC
HIGH CURRENT DUAL OUTPUT
SYNCHRONOUS BUCK CONVERTER
SIZE
LTC3861EUHE
DEMO CIRCUIT 1822A
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
Wednesday, December 14, 2011
E
REV.
2
SHEET 3
OF 3
1
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