DC1126A - Schematic

A
B
C
D
E
NOTE:
VOUT1
R1
10K
S128
SENSE1-
1
TRK/SS1
2
ITH1
3
VFB1
4
VFB2
JP1
RUN1
1
E10
R36
OPT
C18
OPT
2
ON
3
OFF
RUN2
C21
OPT
3
VIN
19
INTVCC
18
S2+
R19
43.2K
8
29
VOUT2
RUN2
ON
GND
D1
CMDSH-3
VINF
INTVCC
R12
2.2
16
BOOST2
15
VL21
7
6
5
C9
4.7uF
10V
SENSE2PGND
SI4816BDY
TG2
17
C10
0.1uF
3
CIN2
4.7uF
16V
Q2
BG2
VSW2
2.2uH
TDK RLF7030
4
VOUT2
RSNS2
0.008
L2
VOUT2
1206
OFF
TG2
14
SW2
13
R18
0 Ohm
GND
E6
VSW2
CIN4
OPT
R24
100K
PGOOD
EXTVCC
E12
EXTVCC
R26
OPT
PGOOD
VSW1
3
7
8
BG1
NOTE:
When DCR sencing is implemented
short RSENSE1 and RSENSE2.
1
Do not stuff R7,R9,R20 or R21
R29
OPT
Stuff R41 with 0 Ohms for
4.5V VIN 5.5V
R40
OPT
V
R32
OPT
R41
OPT
VL2-
V
R34
OPT
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
2
OPTIONAL MOSFETS
Q4
FDS6982AS
OPT
R39
OPT
S2-
S2+
VSW2
1
VINF
INTVCC
R27
OPT
3
7
8
BG2
Q3
FDS6982AS
OPT
VL1-
S1-
S1+
VSW2
4
2
VSW1
TG2
4
R25
0 Ohm
E14
OPTIONAL DCR SENSING
2
CIN5
OPT
VIN
TG1
PGOOD
2.5V / 5A
C23
1uF
6.3V
D2
CMDSH-3
C14
0.1uF
EXTVCC
E5
COUT4
220uF
+
4V
COUT3
10uF
6.3V
SENSE2+
SGND
C22
1uF
6.3V
+
E4
5
6
R38
OPT
2
20
C16
1000pF
1
E11
BG1
BG2
7
R21
10
JP2
RUN2
RUN2
21
TRK/SS2
9
2
C13
100pF
C15
22pF
VIN
R37
OPT
S2-
R20
10
BOOST1
PGOOD
RUN1
Q1
SI4816BDY
12
RUN1
6
22
ITH2
TRK/SS2
C12
1000pF
R17
7.5K
EXTVCC
R35
OPT
5
R16
20.0K
VIN
TG1
LTC3850EUF
E3
COUT2
220uF
4V
5
6
R14
20.0K
C17
OPT
11
R23
0 Ohm
23
R10
0 Ohm
1206
COUT1
10uF
6.3V
SW1
U1
ILIM
E9
3
RUN2
SYNC
C8
1000pF
10
R11
10K
4
VOUT1
3.3V / 5A
1
R9
10
4
E2
VOUT1
RSNS1
0.008
L1
2.2uH
TDK RLF7030
BG1
C5
0.1uF
TRK/SS1
SYNC
5
R31
0 Ohm
VSW1
7
6
2
C7
100pF
SENSE1+
VL11
8
R15
OPT
27
CIN3
39uF
16V
+
GND
TG1
VSW1
RUN1
C4
1000pF
C11
10nF
R4
3.32K
S1+
R7
10
R8
63.4K
R30
OPT
2
E8
C6
15pF
SYNC
25
TRK/SS1
R13
0 Ohm
TRK/SS1
C2
1000pF
CIN1
4.7uF
16V
3
R5
20.0K
FREQ
C3
OPT
26
4
R22
0 Ohm
8
E7
VIN
6.5V to 14V
E1
3
Fsw=500kHz,typ
INTVCC
24
R3
43.2K
RUN1
TRK/SS2
TRK/SS2
VIN
MODE
Converter is setup for
coincident rail tracking
B
C
CONTRACT NO.
APPROVALS
DATE
DRAWN Antonina Karpova 6/19/06
CHECKED
APPROVED
ENGINEER Mike Shriver
6/19/06
DESIGNER
Friday, June 15, 2007
D
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
1
TITLE
LTC3850EUF
3.3V/5A and 2.5V/5A REGULATOR
SIZE
CAGE CODE
SCALE:
FILENAME:
DWG NO
REV
DC1126A
SHEET
E
1
3
OF
1
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