DC1978A - Schematic

5
4
NOTE:
MAKE ALL TSENSE
TRACES SHIELDED
AND DIFFERENTIAL
PLACE CAPS
AND GND CONNECTIONS
CAPS NEAR LTC2974
TSENSE0P
C1
0.1µF
NT1
3
NET TIE
C2
0.1µF
NT2
TSENSE0M
TSENSE1P
NET TIE
TSENSE2P
C3
0.1µF
NT3
TSENSE1M
2
TSENSE2M
NET TIE
C4
0.1µF
NT4
1
REVISION HISTORY
TSENSE3P
ECO
__
REV
DESCRIPTION
APPROVED
DATE
PRODUCTION
KALIN L.
08-31-11
4
TSENSE3M
NET TIE
NOTES - UNLESS OTHERWISE SPECIFIED:
D
1 - ALL CHIP CAPS AND CHIP RES ARE 0402
U1
LTC2974
VDD33
WDI/RESETB
R3
10.0K
R2
100
RESET
C5
0.01µF
VDD33
C
63
64
VSENSEP1
VSENSEM1
VSENSEP2
VSENSEM2
61
62
VSENSEP2
VSENSEM2
ISENSEP1
ISENSEM1
43
44
ISENSEP1
ISENSEM1
ISENSEP2
ISENSEM2
45
46
ISENSEP2
ISENSEM2
NC_60
NC_59
60
59
NC
NC
NC
NC
56
55
NC_56
NC_55
VDAC1
54
VDAC1
VDAC2
57
VDAC2
TSENSE1P
16
TSENSE1
TSENSE2
27
TSENSE2P
CONTROL2
22
VOUT_EN2
33
CONTROL1
CHANNEL 2
VDD33
TP1
VSENSEP1
VSENSEM1
CHANNEL 1
R1
10.0K
SW4
D
CONTROL1
VDD33
R4
10.0K
CONTROL2
VDD33
ASEL0
ASEL1
HI
VOUT_EN1
4
VOUT_EN1
VOUT_EN2
5
VSENSEP0
VSENSEM0
1
2
VSENSEP0
VSENSEM0
VSENSEP3
VSENSEM3
49
50
VSENSEP3
VSENSEM3
ISENSEP0
ISENSEM0
41
42
ISENSEP3
ISENSEM3
47
48
ISENSEP3 VDD33
ISENSEM3
VIN_SNS
9
8
NC
NC
52
51
NC_52
NC_51
VDAC0
53
VDAC3
58
VDAC3
TSENSE0P
15
TSENSE3
34
TSENSE3P
HI
C
3
VOUT_EN0
VOUT_EN3
6
REFM
38
REFP
24
SHARE_CLK
WDI/RESETB
18
SHARE_CLK
28
WP
OFF
10
VPWR
ON
VIN
WRITE-PROTECT
R16
R14
10.0K
A
D7
BAT760
G1
Q1
S
2
D
3
C7
C8
0.1µF 0.1µF
SI1303DL
4
R8
R9
R10 R11 R12 R13
10.0K 10.0K 10.0K 10.0K 10.0K 10.0K
SDA
VOUT_EN3
TP4
35
36
SCL
AUXFAULTB
ALERTB
31
ALERTB
PWRGD
17
PWRGD
SCL
SDA
30
29
SCL
SDA
FAULTB0
FAULTB1
25
26
FAULTB0
FAULTB1
CUSTOMER NOTICE
C9
0.1µF
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
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.
5
R7
10.0K
VDD33
TP3
T1
49.9K
JP2
CONTROL3
R17
150K
V_DONGLE
VDD33
JP1
B
GND
GND
GND
GND
GND
WDI/RESETB
E-PAD
LO
7
AUXFAULTB
12
11
R15
10.0K
40
ASEL0
ASEL1
LO
19
20
21
37
39
C6
0.1µF
B
CHANNEL 0
CONTROL3
E-PAD
VDD33
JP3
CONTROL0
23
VOUT_EN0
SHARE_CLK
TSENSE0
32
65
CONTROL0
VDAC0
VDD25(IN)
VDD25(OUT)
TP2
R6
10.0K
VIN_SNS
NC
14
13
VDD33
NOTE:
THE NET PULLUP RESISTANCE
ON SHARE_CLK LINE SHOULD
BE BETWEEN 4.2K AND 5.5K
ISENSEP0
ISENSEM0
VDD33
VDD33
R5
5.49K
CHANNEL 3
FLOAT FLOAT
3
TECHNOLOGY
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER WITH EEPROM
SIZE
N/A
SCALE = NONE
2
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.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1809A
Wednesday, August 31, 2011
SHEET 1
1
OF 3
A
5
4
3
2
1
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
CONTROL0
PG_IN SW0
TP5
CNTRL0
JP4
SW0
1
SDA
2
GND
3
SCL
4
LGKPWR
5
ALERTB
6
GPI_1
7
OUTEN
8
GPI_2
9
R24
DNI
GND
10
R25
DNI
AUXSCL
11
R26
DNI
AUXSDA
12
VDD33
R19
100k
R32
4.99K
U2
24LC025-I/ST
R34
4.99K
1
A0
VCC
8
2
A1
WP
7
AUXSCL
AUXSDA
3
A2
SCL
6
4
VSS
SDA
5
R28
R29
DNI
0
R30
DNI
R33
DNI
CONTROL1
PGOOD0
SHARE_CLK
WDI/RESETB
CONTROL0
CONTROL1
CONTROL2
CONTROL3
2
SW1
BUS SIGNALS:
VDD33
R23
100
DEBOUNCE
C11
0.01µF
GND 3
1 LGKPWR
2 VIN_SNS
3 GND
4 AUXFAULTB
5 SCL
6 ALERTB
7 SDA
8 CONTROL0
9 CONTROL2
10 CONTROL3
11 WDI/RESETB
12 CONTROL1
13 SPARE3 (PGOOD)
14 SHARE_CLK
15 FAULT4
16 FAULT2
17 FAULT3
18 FAULT1
19 SPARE 4
20 GND
CNTRL1
JP5
CONTROL2
PG_1 SW2
R27
100k
CNTRL2
JP6
CONTROL2
PGOOD1
SW2
VDD33
R35
100k
R31
100
DEBOUNCE
C13
0.01µF
CONTROL3
PG_2 SW3
TP8
JP7
CONTROL3
VDD33
A
TURRETS
5
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
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.
4
3
R36
100
DEBOUNCE
C14
0.01µF
GND3
1
CUSTOMER NOTICE
D1
(GREEN)
LTC2974 ON
2
TP9 TP10 TP11
SW3
R37
1k
GROUND TEST
POINTS
2
1HI
2
4
6
8
10
12
14
16
18
20
1
3
5
7
9
11
13
15
17
19
J3
B
CNTRL3
PGOOD2
DEMO BOARD
IDENTITY EEPROM
C
TP7
2
ALERTB
R22 0
TP6
1 HI
FAULTB0
PGOOD3
AUXFAULTB
ALL SIZE 0402
CONTROL1
PG_0 SW1
R20
100k
1 HI
R21 DNI
FAULTB1
B
R18
100
DEBOUNCE
C10
0.01µF
VDD33
DC1613
C12
0.1µF
GND3
PGOOD_IN
AUXP
GND3
C
USBTO I2C/SMBUS/PMBUS
HEADER 12POS 2MM VERT GOLD
J2
D
2
J1
LGKPWR
1 HI
SCL SDA
CONTROL0
2
4
6
8
10
12
14
16
18
20
D
1
3
5
7
9
11
13
15
17
19
BOARD-TO-BOARD CONNECTOR
TO CASCADE MULTIPLE DEMO BOARDS
TECHNOLOGY
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER WITH EEPROM
SIZE
N/A
SCALE = NONE
2
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.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1809A
Wednesday, August 31, 2011
SHEET 2
1
OF 3
A
5
4
3
2
1
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
+3.3V
D
D
J4
NC_56
C19
1.0µF
0603
C20
0.1µF
C21
0.1µF
NC_55
C22
0.1µF
BOARD TO BOARD
CONNECTOR
MATES WITH DC1810A
3
4
2Y
5
VCC
1
2
2
PWR GOOD
1
FAULTB1
1
FAULTB0
ALERTB
D6
(GREEN)
Q2
C
1
2
C16
0.01µF
2A
C18
10µF
0805
TSENSE3M
PGOOD3
BYP
C17
0.1µF
NC_52
D5
(RED)
3
VSENSEM3
ISENSEM3
NC_51
GND
SHDN
5
4
2
6
2
GND
6
1Y
GND
R42
300
U5
1A
3
U4
SN74LVC2G07DCKR
7
1
SENSE/ADJ* GND
R41
300
D4
(RED)
2
2
4
2Y
8
R40
300
D3
(RED)
3
IN
5
VSENSEM2
ISENSEM2
AUXSCL
TSENSE2M
PGOOD2
OUT
VCC
LT1763CS8-3.3
1
GND
VIN
D2
(RED)
2
U3
2A
AUXFAULTB
1
VIN
+3.3V LINEAR REGULATOR
6
1Y
+3.3V
VSENSEM1
ISENSEM1
NC_59
TSENSE1M
PGOOD1
R39
300
1A
TSENSE0M
PGOOD0
R38
300
1
C15
0.1µF
VSENSEM0
ISENSEM0
2
TSENSE3P
VDAC3
VOUT_EN3
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
SN74LVC2G07DCKR
C
VSENSEP2
ISENSEP2
AUXSDA
TSENSE2P
VDAC2
VOUT_EN2
VSENSEP3
ISENSEP3
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
1
VIN
VSENSEP0
ISENSEP0
VIN_SNS
TSENSE0P
VDAC0
VOUT_EN0
VSENSEP1
ISENSEP1
NC_60
TSENSE1P
VDAC1
VOUT_EN1
AUXFAULTB
TP12
ALERTB
ALERTB
PWRGD
TP14
FAULTB0
FAULTB0
FAULTB1
DNI
Q3A
SI1988DH-T1-E3
LGKPWR
1
4
2
R44
100K
Q3B
SI1988DH-T1-E3
ISENSEP0
3
C32
1.0µF
0603
5
6
C27
1.0µF
0603
U6
R46
16.9K
C33
0.1µF
SCL
V_DONGLE
J5
1
2
3
4
HEADER FOR
IN-SYSTEM
PROGRAMMING
ISENSEM0
C23
10n
C28
10n
1
VIN
GATE
8
C24
10n
C29
10n
ISENSEM1
ISENSEP2
C25
10n
C30
10n
ISENSEM2
ISENSEP3
C26
10n
B
C31
10n
ISENSEM3
2
UV
VOUT
7
3
OV
FAULT
6
4
GND
SHDN
5
INPUT FILTERS FOR CURRENT SENSING
PLACE CLOSE TO LTC2974
LGKPWR
R47
CUSTOMER NOTICE
100K
OVERVOLTAGE
PROTECTION
LGKPWR = 3.0 to 3.6V
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
ISENSEP1
SDA
LTC4365CTS8
R45
4.87K
TP15
FAULTB1
R43
POWER FROM USB DONGLE
B
TP13
PWRGD
4
3
TECHNOLOGY
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER WITH EEPROM
SIZE
N/A
SCALE = NONE
2
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.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1809A
Wednesday, August 31, 2011
SHEET 3
1
OF 3
A
5
4
3
2
1
REVISION HISTORY
ECO
1
R5
C11
22nF
VDAC1
R24
620
R26
68k
R27
13.3k
C31
1nF
B
C30
33pF
R30
20k
TRACKING
R25
20k
SOFT START
CLK1
TRACK CH0
JP1
C33
22nF
R31
13.3k
C26
10uF
0805
R32
40.2k
C27
10uF
0805
C28
10uF
0805
R23
10
2.2
PWM
+5V
5
10M
330
1
2
3
VSENSEM0
TSENSE0P
VSWH
R2J20602NP
2
L2
4
1
C34
47uF
1210
GH
GATE
VOUT1
C32
100nF
TP4
C35 GND
47uF
1210
CH1: 1.5V, 2A
R35
1.0K
C38
100nF
C39
3.3nF
C40
100nF
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
TECHNOLOGY
2
VSENSEP1
B
VSENSEM1
ISENSEM1
C41
3.3nF
R39
1.0K
ISENSEP1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER
SIZE
N/A
SCALE = NONE
TSENSE1M
C36
100nF
R33
100
R34
1.0K
4
TSENSE0M
VOUT1
R29
100
4.7uH
T2
4.7uF
GND_SIGNAL
C22
220nF
TP3
1.5V
GL
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
1
C
3
Q2
MMBT3906
Q3
MMBT3906
1.0µF
CUSTOMER NOTICE
1 - ALL CHIP CAPS AND CHIP RES ARE 0603
C21
220nF
TSENSE1P
PG1 (GREEN)
CH1 POWER GOOD
NOTES - UNLESS OTHERWISE SPECIFIED:
C18
100nF
100
R38
1.0K
A
VSENSEP0
C13
100nF
R16
C37 DrMOS Driver/MOSFET
PGOOD1
R37
TP2
GND
470nF
R28
1.0K
C29
DISABLE
Q1B
SI1988DH-T1-E3
VOUT0
2
C24
1.0µF
U3
R36
C16
47uF
1210
R20 226
VOUT_EN1
+5V
ISENSEM0
C25
Fsw=500kHz
R22
20k
C15
47uF
1210
CH0: 1.8V, 2A
R21
9
10
11
12
13
14
15
16
LTC3860
R9
1.0K
C14
D
C9
3.3nF
100
470nF
VIN
ISENSEP0
C3
3.3nF
R8
1.0K
R18 226
R19
75K
08-31-11
3
C23
1nF
RUN1
ILIM1
ISNS1P
ISNS1N
ISNS2N
ISNS2P
ILIM2
RUN2
GATE
VOUT0
KALIN L.
R10
DrMOS Driver/MOSFET
BOOT
20k
VCC
FB1
COMP1
VSNSOUT
VSNSN
LTC3860EUH
VSNSP
COMP2
FB2
4.7uH
4.7uF
REG5V
1nF
R14
24
23
22
21
20
19
18
17
C19
R7
1.0K
GH
PGND
C17
1
2
3
4
5
6
7
8
T1
U1
R13
75K
VCIN
C
C20
33pF
TRACK/SS1
VINSNS
SGND
SGND
IAVG
PGOOD1
PWMEN1
PWM1
R17
10k
TRACK/SS2
FREQ
CLKIN
CLKOUT
PHSMD
PGOOD2
PWMEN2
PWM2
47k
+5V
TP1
1.8V
L1
VSWH
DATE
R4
1.0K
C8
100nF
1.0µF
R2J20602NP
32
31
30
29
28
27
26
25
U2
R15
VDAC0
DISABLE
C5
GL
APPROVED
PRODUCTION
C2
100nF
10
PWM
4
R6
2.2
PGND
C12
4.7uF
R12
620
C7
10uF
0805
VLDRV
+5V
C10
R111nF
20k
VIN
C6
10uF
0805
REG5V
C4
10uF
0805
V_MASTER
VIN
2
PGOOD0
C1
1.0µF
BOOT
SI1988DH-T1-E3
PG0 (GREEN)
VOUT_EN0
6
VIN
330
2
DESCRIPTION
R3
1.0K
VIN
VLDRV
1
Q1A
VCIN
10M
CH0 POWER GOOD
CGND
D
R2
CGND
+5V
R1
REV
__
LTC3860 DUAL OUTPUT BUCK CONVERTER USING DrMOS
DATE:
IC NO.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1810A
Wednesday, August 31, 2011
SHEET 1
1
OF 3
A
5
4
3
2
1
LTM4620 DUAL OUTPUT MICRO-MODULE
PGOOD3
C42
PGOOD2
4.7uF
D
U4
PHASEMD
COMP1
RUN2
JP2
R55
20k
TRACK CH0
TRACKING
C60
10nF
VOUT1S
R48
VFB1
C52
100uF
1210
TP6
C54 GND
22uF
1206
DIFFOUT
DIFFN
DIFFP
SGND
ISENSEM2
R44
1.0k
C53
330uF
7343
C51
100nF
C55
100nF
100
R49
60.4k
100
R50
VOUT2S
VFB2
R58
R54
1.0k
C56
100nF
C58
100nF
C57
3.3nF
C59
3.3nF
TP7
1.0V
ISENSEP3
ISENSEM3
R59
1.0k
1.0k
R56
1M
VSENSEM2
VDAC3
R53
TRACK CH0
CH2: 1.2V, 5A
C
220k
R52
91k
VSENSEP2
VDAC2
180k
R51
SOFT START
TRACKING
C61
10nF
D
VOUT2
1.0k
R57
20k
R61
30k
R43
1.0k
ISENSEP2
R47
JP3
SOFT START
R60
20k
TP5
1.2V
GND
C44
3.3nF
C50
3.3nF
VOUT2
COMP2
V_MASTER
C48
10uF
1206
C43
100nF
C49
100nF
SW2
TRACK2
V_MASTER
EXTVCC
LTM4620
TRACK1
C
C47
10uF
1206
VOUT1
RUN1
VOUT_EN3
C46
10uF
1206
R41
1.0k
SW1
FSET
120k
VOUT_EN2
C45
10uF
1206
VIN
+
Fsw=500kHz
R46
INTVCC
CLKOUT
PGOOD2
TSENSE2M
R45
0
TEMP
PGOOD1
TSENSE2P
MODE_PLLIN
CLK2
R42
0
VIN
R40
1.0k
VOUT3
B
C62
100uF
1210
+5V
R64
5
SI1988DH-T1-E3
PGOOD3
CUSTOMER NOTICE
GND_SIGNAL
4
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
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.
5
VSENSEM3
2
Q4B
4
1
A
SI1988DH-T1-E3
2
PGOOD2
B
CH3: 1.0V, 5A
PG3 (GREEN)
CH3 POWER GOOD
R67
10M
2
6
Q4A
R63
VSENSEP3
1
330
PG2 (GREEN)
CH2 POWER GOOD
R66
10M
C65
22uF
1206
C64
100nF
C66
100nF
100
R65
3
330
C63
330uF
7343
TP8
GND
100
1
+5V
+
R62
3
TECHNOLOGY
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER
SIZE
N/A
SCALE = NONE
2
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.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1810A
Wednesday, August 31, 2011
SHEET 2
1
OF 3
A
2
EXTERNAL POWER INPUT
VPWR
J1
TSENSE3P
VDAC3
VOUT_EN3
C
VSENSEM0
ISENSEM0
8
7
R68
6
5
3
VIN1
VIN+
VIN
VSENSEM2
ISENSEM2
AUXSCL
TSENSE2M
PGOOD2
R69
150k
1
+
J2
2
TSENSE0M
PGOOD0
VSENSEM1
ISENSEM1
IIN_SNSM
TSENSE1M
PGOOD1
1
VIN
Q5B
SI4946BEY-T1-E3
U5
PWR1
VIN = 9 to 15V
R70
13.3K
R71
5.49K
GND
TSENSE3M
PGOOD3
C69
10uF
1206
C70
10uF
1206
LTC4365CTS8
J3
VSENSEM3
ISENSEM3
D
0.020
2512
C68
10uF
1206
C67
220uF
4
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
Barrel - Power
VSENSEP2
ISENSEP2
AUXSDA
TSENSE2P
VDAC2
VOUT_EN2
VSENSEP3
ISENSEP3
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
+
VIN
VSENSEP0
ISENSEP0
VIN_SNS
TSENSE0P
VDAC0
VOUT_EN0
VSENSEP1
ISENSEP1
IIN_SNSP
TSENSE1P
VDAC1
VOUT_EN1
-
D
Q5A
SI4946BEY-T1-E3
1
IIN_SNSM
3
IIN_SNSP
4
VIN_SNS
5
1
1
VIN
GATE
8
2
UV
VOUT
7
3
OV
FAULT
6
4
GND
SHDN
5
VPWR
R72
150k
REVERSE AND OVERVOLTAGE PROTECTION
GND1
C
BOARD-TO-BOARD CONNECTOR
MATES WITH DC1809A
R73
10K
+5V
PRELOAD CH0 PRELOAD CH1 PRELOAD CH2 PRELOAD CH3
VOUT0
VOUT1
VOUT2
OPTIONAL CH2 TEMP SENSOR
VOUT3
2
+5V
B
CLK2
4
5
OUT4
7
OUT2
OUT3
6
WP
7
3
A2
SCL
6
AUXSCL
SDA
5
AUXSDA
4
VSS
3
3
3
TSENSE2M
3
R77
18.0
1210
DC1810 IDENTITY
EEPROM
MULTI-PHASE OSCILLATOR
VIN
A1
Off
SW2
R78
15.0
1210
SW3
Off
Off
R79
12.0
1210
SW4
TSENSE3P
Off
2
OUT1
2
1
2
8
8
1
GND
VCC
2
PH
SW1
A0
2
MOD
R76
5.49K
1
Q6
DNI - MMBT3906
On
TSENSE2P
R80
10.0
1210
Q7
MMBT3906
1
C74
220nF
TSENSE3M
B
3
CLK1
3
DIV
9
C72
1.0µF
On
1
C78
1nF
10
On
1
C73
1.0µF
2
SET
V+
24LC025-I/ST
1
1
On
R75
5.49K
2
U7
3
U6
LTC6902CMS
C71
220nF
OUTPUT PRE-LOADS
SECONDARY TEMPERATURE SENSORS
+5V
U8
LT1763CS8-5
A
C76
1.0µF
8
IN
OUT
1
7
GND SENSE/ADJ*
2
6
GND
GND
3
5
SHDN
BYP
4
5.0V LDO
CUSTOMER NOTICE
C75
10nF
C77
10uF
0805
GND_SIGNAL
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
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. S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. KALIN L.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
TECHNOLOGY
TITLE: SCHEMATIC
QUAD DIGITAL POWER SUPPLY MANAGER
SIZE
N/A
SCALE = NONE
2
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.
LTC2974CUP
REV.
4
DEMO CIRCUIT 1810A
Wednesday, August 31, 2011
SHEET 3
1
OF 3
A
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