DC1909A - Schematic

5
4
3
2
1
D
D
E1
VIN_S
J1
63V
63V
R17
1M
0603
C1
GND
C3
E2
GND_S
28
0.47uF
100V
1206
ENABLE
1
EN
2
14
3
1uF 100V
JP1
C
13
1206
R18
(Opt)
0603
12
R3
1M
11
9
R5
(Opt)
4
10
VOUT
R7
0 Ohm
5
R9
100k
27
AUXSW1
AUXSW2
VIN
INTVCC
C2
4.7µF
16V
0603
26
AUXVIN
PGND
EN
BOOST
UVLO
U1
LT3840EFE#PBF
TG
OVLO
SW
PG
BG
SYNC
BGRTN
MODE
SENSE+
RT
SENSE-
2
R2
R11
105k
1%
(150kHz)
PG
E6
SYNC
R14
100k
C8
100pF
R12
13.0k
1%
6
1
2
3
4
CONT
PULSE SKIP
FB
TK/SS
5
6
BURST
C11
1nF
GND
ICOMP
ICTRL
IMON
GND
18
17
16
29
R21
1k
JP2
E7
VC
C10
2.2nF
MODE
INTVCC
FB
8
Q3
R20
25
C17
(Opt)
BSC042NE7NS3
0 Ohm
24
CIN7
2.2uF
100V
1210
CIN8
2.2uF
100V
1210
CIN9
2.2uF
100V
1210
CIN10
(Opt)
1210
CIN11
(Opt)
1210
CIN12
(Opt)
1210
E3
VOUT_S
R4
(Opt)
1206
C5
(Opt)
1206
J3
VOUT
0.0025
1%
1W
2512
D2
PDS5100H
COUT1
22uF
6.3V
0805
COUT3
(Opt)
0805
COUT2
22uF
6.3V
0805
COUT4 COUT5
COUT6
(Opt) + 680µF + 680µF
6.3V
6.3V
0805
C6
10nF
20
R8
12
7
C7
(Opt)
R13
499k
1%
J4
VOUT
3.3V / 20A
C
COUT7
0603
J5
R6
19
15
Q4
BSC042NE7NS3
0 Ohm
CIN6
2.2uF
100V
1210
L2
2.2µH
HC2LP-2R2-R
COOPERBussmann
RSNS1
1µF
16V
0603
R19 0 Ohm
22
CIN5
2.2uF
100V
1210
Q2
BSC123N08NS3
C4
23
21
CIN4
2.2uF
100V
1210
D1
1N4448HWS
FB
E5
B
Q1
BSC123N08NS3
INTVCC
1
C16
3
DIS
1µF
16V
0603
AUXBST
CIN3
0.22uF
100V
0805
L1
33µH
ME3320-333KL
3
CIN2
+ 56µF
1
J2
CIN1
+ 56µF
2
VIN
4V TO 60V
80V TRANSIENT
J6
GND
12
E4
R10
GND_S
825k
1%
C9
(Opt)
R22
0 Ohm
OPTIONAL CIRCUIT
C12
2.2nF
B
TK/SS
C13
10nF
E8
U2
LT3009ESC8-5#PBF
INTVCC
GND
5
E9
GND
C14
1uF
16V
0805
ICTRL
E10
ICTRL
1
IN
OUT
SHDN
ADJ
5V
6
C15
1uF
10V
0603
7
GND GND GND
2
3
R15
3.74M
1%
0603 ICTRL
4
E11
R16
TBD
0603
IMON
E12
GND
E13
GND
A
A
CUSTOMER NOTICE
NOTE: UNLESS OTHERWISE SPECIFIED.
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
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1. ALL RESISTORS 0402.
2. ALL CAPACITORS 0402.
C:\PADS PROJECTS\1909A(LT3840EFE)\SCH\1909A_REV2.DSN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
TECHNOLOGY
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
WIDE INPUT RANGE, HIGH EFFICIENCY,
SYNCHRONOUS BUCK CONVERTER WITH ACCURATE CURRENT LIMIT
SIZE
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
IC NO.
REV.
LT3840EFE
DEMO CIRCUIT 1909A
MODIFY DATE: Jun 19, 2014
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