DC2422A - Schematic

1
2
3
4
5
6
7
8
REVISION HISTORY
ECO
REV
-
2
DESCRIPTION
DATE
PRODUCTION
APPROVED
11/30/15
DL
INTVCC
INTVCC
MODE
E7
CLKIN
INTVCC
A
2
FCM
3
4
PS/SYNC
5
6
BURST
R94
OPT
E8
A
INTVCC
U1
LTC7812EUH
R72
0
R92
100K
E13
10
9
PLLIN/MODE
OV2
6
VFB1
*
VBUS
VOUT1
R70
R78
0
0
14
VFB2
SGND
21
VSW1
20
S1+
18
VL1-
*
R79
49.9K
VBUS
N/C
C43
68pF
R35
B
ITH1
5
C44
2.2nF
VBIAS
VBIAS
*
R102
2010
26
C17
0.1uF
ITH1
Q1
BSC093N04LS
15K
1nF
C54
ITH2
15
TG1
ITH2
BOOST1
R75
3.6K
SW1
BG1
SENSE1+
R34
SS1
0
R37
OPT
C47
0.1uF
SS2
4
11
BOOST1
7
D1
VL2-
S1-
S2-
TG1
TG2
BG1
BG2
VIN
2010
VBUS_
C51
4.7uF
50V
0805
C59
10uF
50V
1210
C79
OPT
0805
VL1-
S1+
E3
VOUT1
VOUT1
RS1
VSW1
1nF
S1-
EXTVCC
EXTVCC
B
SHT 2
C78
OPT
0805
L1
BG1
4
SS2
C52
0.1uF
SHT 2
INTVCC
C15
8
*
C21
0.1uF CMDSH-4E
1
31
R101
4
R95
TRK/SS1
SENSE1-
S2+
SHT 2
J3
0.003
4.7uH
COUT4
4.7uF
16V
1206
Q2
BSC093N04LS
+
COUT5
150uF
16V
7343
+
COUT11
150uF
16V
7343
R39
0
VOUT1
C36
OPT
1206
J4
1
2
3
E9
TG1
32
0
10nF
TRACK / SS1
2
5
6
7
8
C53
VSW2
23
5
6
7
8
OPT
R36
VFB2
OV2
1
2
3
R43
VFB1
SGND
C55 OPT
22
FREQ
SGND
*
C49
C62
1nF
JP3
FREQ
R33
R48
100K
1
R40
0
GND
E4
GND
25
J5
RUN2 19
RUN1
BOOST2
28
BOOST2
RUN1
R96
RUN2
SW2
30
SW2
29
TG2
27
BG2
VBUS
D2
C4
0.1uF
INTVCC 24
RUN2
C60
OPT
1
ON
E12
R46
100K
OFF
SENSE2-
C56
C64
4.7uF
3
JP2
C3
OPT
1210
C6
OPT
1210
C5
4.7uF
50V
0805
COUT6
10uF
50V
1210
COUT8
10uF
50V
1210
+ COUT1
100uF
50V
+
COUT2
OPT
E6
GND
4
J6
L2
RS2
0.004
1nF
1.0uH
R82
OPT
RS3
0.004
R80
0
VL2-
C63
C
GND
E1
VIN
J1
VSW2
OPT
Q22
BSC027N04LS
R81
100
CIN2
10uF
50V
1210
4
1
2
3
INTVCC
2
C2
OPT
1210
13
JP1
E11
RUN2
TG2
BG2
S2-
SGND
VBUS
Q21
BSC027N04LS
C1
OPT
1210
1
2
3
PGOOD1
SENSE2+
16
PGND
C77
OPT
S2+ 12
3
INTVCC
2
OFF
33
3
ON
E5
CMDSH-4E
1
C
VBUS
INTVCC
0
5
6
7
8
RUN1 17
5
6
7
8
E10
RUN1
*
PGOOD1
CIN3
10uF
50V
1210
CIN4
10uF
50V
1210
CIN5
OPT
1210
+
VIN+
VIN
CIN1
33uF
63V
J2
**
GND
C57
VIN-
OPT
E2
**
4~36VIN
VBUSFOLLOWSVINWHEN
VIN>VBUSSETVOLTAGE
[email protected]<8V
D
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS ARE 0603.
ASSY VOUT1
‐A
12V
‐B
12V
‐C
5V
R33
35.7K
26.7K
68.1K
*
R43
499K
499K
357K
CUSTOMER NOTICE
R78
549K
365K
453K
R101
OPT
OPT
0
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.
R102
0
0
OPT
APPROVALS
PCB DES.
LT
APP ENG.
DL
TECHNOLOGY
TITLE: SCHEMATIC
WIDE VIN, STEP UP/DOWN POWER SUPPLY
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
2
3
4
5
6
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
IC NO.
N/A
SCALE = NONE
DATE:
LTC7812EUH
DEMO CIRCUIT 2422A
SHEET 1
Monday, November 30, 2015
7
8
REV.
2
OF 2
D
OPTIONAL DCR SENSING
NOTE:
WHEN DCR SENSING IS IMPLEMENTED,SHORT RS1 & RS2.
REMOVE R30, R29, R80 & R81.STUFF R62 AND R91 WITH 0 OHMS.
CALCULATE R51, R53 & C15 AND R89, R90 & C56 PER THE DATA SHEET.
ALSO REFER TO QSG FOR EXAMPLE.
SHT 1
VSW1
R51
VSW1
S1+
OPT
SHT 1
S1+ SHT 1
SHT 1 VSW2
R89
VSW2
OPT
R53
OPT
R62
S1-
S1-
S2-
VL1-
VL1- SHT 1
S2- SHT 1
R90
OPT
R91
S2+
SHT 1 S2+
VL2-
VL2- SHT 1
OPT
OPT
VIN
L3
EXTVCC
J9
VOUT1
E14
EXTVCC
R55
OPT
SGND
C66
OPT
0805
R85
OPT
E15
VIN_EMI
VIN VBUS
VBIAS
R93
OPT
R86
C61
1uF
OPT
C65
R100
OPT
OPT
0805
C67
OPT
0805
C68
OPT
1210
J10
GND
2.2
VBUS
VBUS
VSW1
SHT 1
BG1
BG1
4
SHT 1
TG2
SHT 1
VSW2
SHT 1
BG2
VSW2
Q18
OPT
CUSTOMER NOTICE
BG2
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.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
LT
DL
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
WIDE VIN, STEP UP/DOWN POWER SUPPLY
N/A
SCALE = NONE
Q11
OPT
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
VSW1
1
2
3
SHT 1
4
TG2
1
2
3
C74
OPT
0805
D3
OPT
4
TG1
5
6
7
8
C73
OPT
0805
Q9
OPT
1
2
3
C40
OPT
0805
TG1
5
6
7
8
C39
OPT
0805
SHT 1
1
2
3
VIN
5
6
7
8
Q19
OPT
C80
10uF
50V
1210
1
VBUS_
5
6
7
8
SHT 1
DATE:
IC NO.
LTC7812EUH
DEMO CIRCUIT 2422A
Monday, November 30, 2015
SHEET 2
REV.
2
OF 2
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