DC2148A - Schematic

5
4
3
2
1
* SEE DEMO MANUAL FOR
IOUT MAX. VS. ‐VIN
E1
J1
PGND
R11
C1
10µF
50V
1210
C2
10µF
50V
1210
C3
10µF
50V
1210
C22
C4
10µF
50V
1210
4
‐4.5V TO ‐38V
L1A
3.5µH
74485540350
Wurth Electronik
L1A‐1
E2
1
R8
(Opt)
C23
L1B‐3
(Opt)
D1
PMEG6030EP
MP1‐D
MP1
SUD19P06‐60‐E3
R19
0 Ohm
2512
L1B
3
2
3.5µH
74485540350
Wurth Electronik
(Opt)
L1B‐3
ISN
(Opt)
13
GND
INTVEE
16
R14
17
100k
BG
ISN
ISP
7
6
R20
0 Ohm
BIAS
8
9
MP1‐S
BIAS
INTVEE
C15
2.2uF
16V
0805
C16
2.2µF
100V
1210
U1
LT8709EFE
MODE
PG
FBY
4
(Opt)
VC
E9
PG
PG
‐VIN
5
C17
0.1µF
E11
‐VIN
‐4.5V TO ‐38V
CUSTOMER NOTICE
3
E10
IMON
C7
4.7nF
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
SYNC
EN/FBIN
INTVCC
APPROVALS
C:\PROJECTS\1-A-PROJECTS\1-PROJECTS-CURRENT\DC2148A-3 RUDY\1-SCH\DC2148A-3.DSN
5
(Opt)
R6
10k
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.
1. ALL RESISTORS 5%, 0603.
2. ALL CAPACITORS 0603.
PG
IMON
R5
88.7k
1%
400kHz
NOTE: UNLESS OTHERWISE SPECIFIED.
B
130k
1%
C20
21
20
C14
0.22µF
A
‐VIN
IMON
RT
C10
2.2uF
16V
0805
INTVCC
18
R16
0 Ohm
12
2
C8
47pF
SS
INTVCC
BIAS
R7
1
SYNC
3
19
SYNC
‐VIN
R23
100k
R15
E5
CSP
INTVCC
R45
(Opt)
EN/FBIN
INTVCC
B
TG
GND
R3
13.3k
1%
10.0k
1%
EN/FBIN
11
14
CSN
C9
10
INTVEE
R4
E6
C
ISP
R18
ISN
CSP
2.2µF
100V
1210
MODE
MP1‐D
R17
ISP
BG
‐VIN
SYNC
L1A‐1
TG
R10
(Opt)
E3
E4
*
TG
(Opt)
EN/FBIN
C26
8mm Dia. SMD
(Opt)
VOUT
J4
VOUT ‐12V
+
E8
(Opt)
(Opt)
C24
C19
(Opt)
1210
R12
22uF 16V
1210
C25
C
C13
22uF
16V
1210
R13
22uF 16V
1210
C6
0.002
1%
2W R9
2512 (Opt)
C12
22uF
16V
1210
(Opt)
MP1‐S
(Opt)
1210
C5
MN1
FDMS86520L
R1
‐VIN
‐4.5V TO ‐38V
(Opt)
1210
C28
C11
22uF
16V
1210
(Opt)
R2
0.006
1%
1W
2512
BG
C18
10µF
50V
1210
+
CSP
C21
220µF
50V
10mm Dia. SMD
J2
‐VIN
D
J3
GND
PGND
15
D
E7
SCALE = NONE
2
TECHNOLOGY
TITLE: SCHEMATIC
SIZE
N/A
IC NO.
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
A
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Negative Input Synchronous
Multi‐Topology DC/DC Controller
LT8709EFE
REV.
DC2148A
MODIFY DATE: Friday, February 06, 2015
3
SHEET
1
1
OF
2
CSP
C35
L1A‐1
MP1‐D
R24
MP1‐D
TG
(Opt)
1210
C27
(Opt)
2512
L1B‐3
ISP
ISN
C36
C29
(Opt)
1210
VOUT
L1A‐1
C37
(Opt)
1210
‐VIN
R36
MN2
(Opt)
PowerPAK SO8
(Opt)
1210
R39
(Opt)
(Opt)
1210
INTVEE
ISP
BG
MP1‐S
BIAS
BG
ISN
R25
(Opt)
CSP
R34
(Opt)
E12
(Opt)
2512
EN/FBIN
SYNC
INTVEE
‐VIN
R26
(Opt)
C33
R30
1k
(Opt)
BIAS
(Opt)
0805
INTVCC
TG
ISN
ISP
R31
(Opt)
R32
(Opt)
R42
20k
(Opt)
C34
(Opt)
0805
D5
(Opt)
SOD‐323
R33
(Opt)
L1B‐3
(Opt)
2512
R21
INTVEE
(Opt)
3
C39
BIAS
R22
INTVCC
D4
ISN
ISP
R37
(Opt)
R38
(Opt)
VOUT
Q1
FMMT593
(Opt)
SOT23
PG
OPTIONAL LEVEL
SHIFTING CIRCUITRY
EN/FBIN
R44
20k
(Opt)
(Opt)
PowerDi5
‐VIN
ISN
TECHNOLOGY
PCB DES.
C30
APP ENG.
TITLE: SCHEMATIC
(Opt)
C31
(Opt)
‐VIN
2
ISP
D2
BAT46WJ
(Opt)
SOD323
R41
100k
(Opt)
R40
1k
(Opt)
APPROVALS
R28
SYNC
R43
20k
(Opt)
(Opt)
(Opt)
0805
(Opt)
2512
1
R35
1k
(Opt)
V_EXT
E13
PGND
Q2
MMBT2222A
(Opt)
SOT‐23
D3
BAT46WJ
(Opt)
SOD323
MP2
(Opt)
PowerPAK SO8
R29
‐VIN
C38
0.1uF
100V
(Opt)
1206
VOUT
R27
MP1‐S
PG
L1A‐1
(Opt)
2512
C32
(Opt)
SIZE
N/A
‐VIN
SCALE = NONE
IC NO.
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Negative Input Synchronous
Multi-Topology DC/DC Controller
LT8709EFE
REV.
DC2148A
MODIFY DATE: Tuesday, January 13, 2015
3
SHEET
2
OF
2
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