13
dc2422af
DEMO MANUAL DC2422A-A,
DC2422A-B, DC2422A-C
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
WIDE VIN, STEP UP/DOWN POWER SUPPLY
WHEN DCR SENSING IS IMPLEMENTED,
CALCULATE R51, R53 & C15
OPTIONAL DCR SENSING
REMOVE R30, R29, R80 & R81.STUFF R62 AND R91 WITH 0 OHMS.
SHORT RS1 & RS2.
AND R89, R90 & C56 PER THE DATA SHEET.
ALSO REFER TO QSG FOR EXAMPLE.
NOTE:
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
SHT 1
VSW1 S1+
S1-
S2-
S2+ VL2-
VSW2
VL1-
TG1
VSW1
BG1
VSW2
BG2
TG2
VBUS
VOUT1
VBUS
VINVBIAS
EXTVCC
VIN
VBUS
VIN
VSW1 S1+ S2-
VL1- VL2-S1- S2+
VSW2
VSW1
TG1
BG1
VSW2
TG2
BG2
VBUS_
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
LTC7812EUH
Tuesday, September 08, 2015 2 2
LT
DL
N/A
DEMO CIRCUIT 2422A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
LTC7812EUH
Tuesday, September 08, 2015 2 2
LT
DL
N/A
DEMO CIRCUIT 2422A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
LTC7812EUH
Tuesday, September 08, 2015 2 2
LT
DL
N/A
DEMO CIRCUIT 2422A
C80
10uF
50V
1210
R85
OPT
J9
VIN_EMI
C65
TBD
R91
OPT
Q9
OPT
4
5
6
7
8
3
1
2
R86
2.2
C73
TBD
0805
C66
TBD
0805
R51
OPT
C67
TBD
0805
R90
OPT
C61
1uF
R100
TBD
0805
L3
TBD
D3
OPT
2 1
R53
OPT
C74
TBD
0805
Q18
OPT
4
5
6
7
8
3
1
2
Q11
OPT
4
5
6
7
8
3
1
2
R93
OPT
R62
OPT
C68
TBD
1210
E14
EXTVCC
R89
OPT
Q19
OPT
4
5
6
7
8
3
1
2
R55
OPT
E15
SGND
J10
GND
C40
OPT
0805
C39
OPT
0805
