DC2002A - Schematic

A
B
C
D
E
REVISION HISTORY
INTVCC
R73
100K
15
13
3
OFF
1
SMOD#
VCIN
VDRV
2
3
4
41
GND
BOOT
5
6
GH
CGND
7
8
SW1
34
COUT4
COUT5
100uF
6.3V
1206
32
VSWH
31
R20
4.64K
1%
R51
931
1%
+
COUT2
COUT1
COUT3
330uF
2.5V
VOUT1+
1.5V / 30A
VOUT1-
R21
0
J4
R18
3
E6
VOS1-
VOS1-
SNS2-
SMOD#
VCIN
1
2
3
VDRV
GND
BOOT
4
41
5
6
GH
VIN
CGND
VSWH
GL
PGND
VSWH
PGND
VSWH
U3
FDMF6820A
PGND
PGND
VSWH
VSWH
THDN2
40
39
R42
4.64K
1%
TP6
38
R38
931
1%
SW2
36
35
34
33
L2
0.33uH
VOUT2
WURTH EL.
744301033
COUT10
COUT9
100uF
6.3V
1206
32
31
VOS2+
R39
R22
0
37
E8
10
+
COUT8 J5
COUT7
COUT6
330uF
2.5V
VSWH
J6
VOS2+
VOUT2+
1.2V / 30A
VOUT2-
R43
30
VSWH
R45
40.2K
VSWH
VSWH
PGND
PGND
29
17
THWN
PGND
16
DISB#
43
CIN6
22uF
16V
1210
15
R31
OPT
R30
10K
2
VIN
PGND
CIN5
22uF
16V
1210
SW2
C35
2.2uF
16V
PWM2
PWM
VIN
28
13
VIN
PGND
12
R46
10K
E12
VOS2-
VOS2-
R88
100K
OPTIONAL COMPONENTS FOR DUAL PHASE CONVERTER
VOSNS1
E13
VOSNS2
R53
NOTE: UNLESS OTHERWISE SPECIFIED
A
J3
R26
1
R29
10K
TP4
CGND
11
7
R44
OPT
PHASE
VIN2
R41
10K
5VBIAS
R25
2.2
0.22uF C11
2.2uF
16V
PWM2
20
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE 0603.
VIN-
VOS1+
E4
10
VOUT1
33
30
VSWH
VSWH
29
PGND
43
PGND
28
PGND
27
PGND
26
PGND
25
PGND
35
10
INTVCC
7V - 14V
VOS1+
R11
L1
0.33uH
744301033
WURTH EL.
SNSDC2+
C9
R87
OPT
C10
0.01uF
C13
0.1uF
JP2
PGOOD2
CIN1
180uF
16V
TP5
36
C38
0.22uF
37
27
2
+
37
11
21
ON
CIN2
180uF
16V
SNSAC2+
19
RUN2
1
+
J1
38
C37
0.22uF
12
VIN
RUN2
VIN-
SNS1SNSAC1+
18
E10
4
VIN+
1m Ohm
2512
14
R85
10K
HIZB2
VIN
R50
C36
0.22uF
16
PGND
VIN2
VIN2
J2
39
DATE
7-17-13
1m Ohm
2512
E2
THDN1
MIKE S.
10
14
R33
OPT
R52
OPT
APPROVED
VIN1
SNSDC1+
26
E7
C47
22pF
VSWH
VSWH
PGND
17
VOS2+
R40
10K
VSWH
PGND
PGND
R27
OPT
TK/SS2
TRACK/SS2
C48
OPT
VOSNS2
PHASE
PGND
VIN
VOUT1
VSWH
U2
FDMF6820A
PGND
25
GND
NC
9
PGND
E30
R6
10K
DESCRIPTION
PRODUCTION
40
C40
0.22uF
18
2
1
VSWH
5VBIAS
TP3
C41
330pF VOS2-
PGND
10
9
RUN2
PWM2
8
GND
SNSDC2+
PWMEN2
7
HIZB2
6
TK/SS2
SNS2-
ITEMP2
ITH2
GL
21
20
21
22
23
24
25
26
VIN
C12
1uF
CGND
VSWH
19
GND
RUN1
PWM1
PWMEN1
HIZB1
TK/SS1
VOSNS1+
SNSAC2+
R35
2.2
27
PGOOD2
INTVCC
ILIM2
VIN
10
R37
8.06K
CLKOUT
5
R34
OPT VIN
PGOOD1
VOSNS2+
R28
OPT
36
SNS1-
MODE/PLLIN
ITEMP2
R32
OPT
35
SNSDC1+
SNSAC1+
1
R24
OPT
C8
4.7uF
10V
0805
THWN
U1
LTC3774EUHE
FREQ
4
34
INTVCC
20
PHMODE
VOSNS2-
33
ILIM1
3
32
VOSNS1-
28
31
37.4K
ITH1
ITEMP1
R17
OPT
30
ITH2
FSW = 400kHz
R23
TP2
2
29
C14
2.2nF
17
18
ITEMP1
C7
330pF
C6
2.2nF
C5
0.01uF
CLKOUT
E11
16
19
CLKIN
E29
CLKOUT
15
SW1
DISB#
24
R19
8.06K ITH1
3
PLLIN
R15
OPT
CIN4
22uF
16V
1210
PWM
VIN
PGND
VOS1-
14
CIN3
22uF
16V
1210
C34
2.2uF
16V
PWM1
VIN
24
NOTE:
REMOVE JUMPER AT JP5
FOR BURST MODE.
R89
INTVCC
MODE
10K
1
PS
2
BM
3
CCM
R16
OPT
JP5
R10
OPT
R9
10K
C45
OPT
12
13
PWM1
PGND
VOSNS1
5VBIAS
15.0K
8
C46
22pF
NC
R14
OPT
PGND
VOS1+
0
2
R49
VIN2+
R5
10K
TP1
VIN
9
R12
E5
R8
23
11
TK/SS1
VIN
10
VIN
E9
TRACK/SS1
42
VIN1
R7
10K
HIZB1
REV
__
R3
C3
2.2uF
16V
22
JP1
E1
ECO
1
R4
10K
VIN
4
C2
0.1uF
VIN1
42
3
VIN
2
OFF
RUN1
R1
40.2K
1
VIN1+
5VBIAS
C1
R2
0.22uF 2.2
22
ON
VIN
VIN
E3
RUN1
23
PGOOD1
B
VOS2-
RUN1
VOUT1
ITH2
R47
OPT
R68
OPT
VOS1-
ITH1
RUN2
OPT
TK/SS1
TK/SS2
R92
R54
R48
OPT
OPT
OPT
2512
R36
OPT
2512
C
VOUT2
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
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
LT
MIKE S.
TITLE: SCHEMATIC
HIGH EFFICIENCY DUAL OUTPUT
STEP-DOWN CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
D
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.
REV.
LTC3774EUHE
DEMO CIRCUIT 2002A
Wednesday, July 17, 2013
2
SHEET 1
E
OF 3
1
A
B
C
R55
R74
0
14
TRACK/SS1
15
VOS1-
SGND
+CSA
-CSA
SGND
1
CLKIN
CIN8
22uF
16V
1210
12
CIN9
22uF
16V
1210
PWMA
VOUTA
GND
+7V
PWMB
9
8
VOUTB
VINB
GND
+CSB
-CSB
COUT16
330uF
2.5V
COUT17
330uF VOUT2
2.5V
COUT14
100uF
6.3V
1206
6
5
6
4
VOS2-
5
RUN2
RUN2
6
7
7
8
8
CLKIN
TRACK/SS2
4
VOS2-
CLKOUT
SGND
SGND
CLKOUT
MILL MAXX
803-43-008-20-001000
MILL MAXX
802-40-008-20-001000
VOUT1
COUT13 COUT18 COUT19
100uF + 330uF + 330uF
6.3V
2.5V
2.5V
1206
+
COUT20
330uF
2.5V
OPTIONAL NTC COMPENSATION
NETWORK FOR DCR SENSING
ITEMP1
OPTIONAL UVLO CIRCUIT
ITEMP2
NOTE:
ALL PARTS WITHIN THIS
BLOCK ARE OPTIONAL
U8
0
LTC4449EDCB
16V
8
R90
2.2
7
6
5
C30
0.22uF
BOOST
TG
VCC
TS
VLOGIC
BG
IN
GND
GND
1
2
NOTE:
ALL PARTS WITHIN THIS
BLOCK ARE OPTIONAL
Q4
BSC050NE2LS
5
4
5
CIN11
22uF
16V
1210
CIN12
22uF
16V
1210
5VBIAS
4
R66
OPT
R65
OPT
R67
OPT
VOUT2
R83
OPT
R82
OPT
1 2 3
1 2 3
Q6
BSC010NE2LS
5
4
5
5VBIAS
R91
2.2
C44
2.2uF
7
6
5
TG
VCC
TS
VLOGIC
BG
GND
1
C32
0.22uF
16V
9
PWM1
Q8
BSC050NE2LS
5
CIN13
22uF
16V
1210
CIN14
22uF
16V
1210
2
4
1 2 3
1 2 3
SW2
2
Q9
BSC010NE2LS
3
4
5
Q10
BSC010NE2LS
4
GND
1 2 3
5
4
BOOST
IN
Q7
BSC050NE2LS
CMDSH-3
0
U9
LTC4449EDCB
16V
4
1 2 3
R80
8
SW1
Q5
BSC010NE2LS
VIN2
D3
R81
2.2
C33
2.2uF
2
4
R84
OPT
VOUT1
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 2
1
3
R70 RN2
OPT OPT
THDN2
TEMP1-
Q3
BSC050NE2LS
CMDSH-3
5VBIAS THDN1
D1
OPT
BAV170
SOT23
3
RN1
OPT
TP10
D2
R79
RUN1 RUN2
1
TP9
VIN1
R78
2.2
R86
OPT
2
16
C22
1uF
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 1
16V
4
VOSNS2
3
TK/SS2
7
TEMP1+
C43
2.2uF
TK/SS1
VOS1RUN1
R72
OPT
OPT
5VBIAS
3
ITH2
2
VOSNS2
5
7VBIAS
C31
2.2uF
1
ITH2
VOSNS1
7VBIAS
C16
4
R62
5VBIAS
ITH1
2
2
0
2
1
3
C42
0.047uF
R77
SNS1-
3
COUT15
330uF
2.5V
4.7uF 0805
10
R76
3.32k
SNSDC1+
2
COUT12
100uF
6.3V
1206
1
VIN1
PWM1
SNSAC1+
CIN10
22uF
16V
1210
GND
TEMPB
CIN7
22uF
16V
1210
VINA
COUT11
100uF
6.3V
1206
+
13
11
3
VOSNS1
RUN1
TEMPA
R75
COUT15-20: Sanyo 2R5TPE330M9
COUT11-14: Murata GRM31CR60J107ME39L
CIN7-10: MURATA GRM32ER61C226KE20L
1uF
PB1
D12S1R845A
DC/DC Converters
C39
0.047uF
3.32k
SNSAC2+
PWM2
VIN2
ITH1
OPT
+
SNSDC2+
TEMP2+
TEMP2C15
TP7
TP8
7VBIAS
J9
RIGHT ANGLE
SOCKET
J8
RIGHT ANGLE HEADER
+
SNS24
E
HEADER/SOCKET TO PARALLEL DC2002A TO ANOTHER DC2002A
OPTIONAL POWER BLOCK
NOTE:
ALL PARTS WITHIN THIS
BLOCK ARE OPTIONAL
D
5
4
1 2 3
1 2 3
9
PWM2
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.
TECHNOLOGY
LT
MIKE S.
TITLE: SCHEMATIC
HIGH EFFICIENCY DUAL OUTPUT
STEP-DOWN CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
D
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.
LTC3774EUHE
DEMO CIRCUIT 2002A
Wednesday, July 17, 2013
REV.
2
SHEET 2
E
OF 3
1
A
B
3
INT BIAS
4
C26
1uF
1
ON
2
OFF
3
1
2
VIN
SHDN
NC
R59
0
16V
33uH
1206
C19
22uF
16V
1210
SW
FB
5
DYNAMIC LOAD CIRCUIT FOR VOUT1
5VBIAS
E22
C18
1uF
E25
D
INT BIAS
5V / 200mA
GND
8
R61
604K
E
DYNAMIC LOAD CIRCUIT FOR VOUT2
VOUT1
Q1
SUD50N03-12P
PULSE GEN1
E16
R56
10k
1%
7
C21
22pF
R63
GND
200k
4
JP3
L3
BIAS
GND
VIN
BOOST
U4
LT3470ETS8
C17
0.22uF
6
BIAS SUPPLY FOR DRMOS
C
E18
VOUT2
VOUT2
Q2
SUD50N03-12P
VOUT1
C28 J7
10uF
0805
C29 J10
10uF
0805
PULSE GEN2
E20
ISTEP1+
R57 E17 LOAD STEP
0.005
5mV / Amp
1%
2010
ISTEP1E19
GND
4
R58
10k
1%
E23
ISTEP2+
R60 E21 LOAD STEP
0.005
5mV / Amp
1%
2010
ISTEP2E24
OPTIONAL BIAS SUPPLY FOR POWER BLOCK
VIN
3
3
PWR BLK BIAS
1
ON
2
OFF
3
VIN
L4
16V
33uH
R64
0
C25 1206
22uF
16V
1210
6
C23
0.22uF
SW
5
7VBIAS
PWR BLK BIAS
E28
C24
1uF
7V / 200mA
3
1
2
SHDN
NC
BIAS
FB
7
8
R69
953K
C27
22pF
R71
200k
4
JP4
C20
1uF
BOOST
U5
LT3470ETS8
GND
NOTE:
ALL PARTS WITHIN
THIS ARE OPTIONAL
2
2
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.
TECHNOLOGY
LT
MIKE S.
TITLE: SCHEMATIC
HIGH EFFICIENCY DUAL OUTPUT
STEP-DOWN CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
D
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.
LTC3774EUHE
DEMO CIRCUIT 2002A
Wednesday, July 17, 2013
REV.
2
SHEET 3
E
OF 3
1
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