DC1695B - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
R1
0
VIN
C1
2.2uF
100V
1812
C3
47uF/63V
+
C4
0.1uF
100V
INTVCC
GND
C5
OPT
R4
100k
E2
U1
PGOOD
R9
OPT
VIN
FREQ
PGOOD
EXTVCC
VFB
INTVCC
INTVCC
16
C6
2.2uF
0805
C7
1uF
R11 OPT
TRACK
1
E5
10
R14
OPT
0805
RUN
1
6
R12 OPT
VIN
C9 0.01uF
5
2
4
3
OFF
C11
OPT
R16
OPT
JP1
R17
15K
C12
2.2nF
18
3
TRACK/SS
RUN
SENSE-
SENSE+
SGND
INTVCC
BOOST
R15
2
TG
PLLIN/MODE
B
INTVCC
INTVCC
R19 OPT
4
BG
Q1
Si7850DP
RS1
0.008
1210
VOUT
VOUT
13
15
4
L1
4.7uH
E6
C15
10uF
1206
D2
OPT
4
1
2
3
C18
OPT
ILIM
D1
DFLS1100
12
C13
0.1uF
SGND
E8
14
SGND
PGND
C10
2.2uF
100V
VIN
21
20
C
R13
100
8
ITH
SW
R18 1K
R10
0
7
C8
2.2pF
C14
180pF
SYNC
R7
115K
2
9
5
17
EXTVCC
ON
R5
357K
0805
R6 41.2K
C16
330uF
4.0V
4TPE330MIC2
+
C17
1uF
B
MODE
R20
100K
3.3V @ 5A
1
2
3
11
R8
OPT
C
D
5
19
E4
DATE
06-05-12
LTC3891EFE
VOUT
E3
VICTOR K.
R2
0
R3
OPT
1
2
3
C2
OPT
APPROVED
INTVCC
5
E1
4.5V UP TO 60V
DESCRIPTION
PRODUCTION
VOUT
VIN
D
1
GND
2
1
4
3
PULSE SKIP
6
5
BURST MODE
Q2
Si7850DP
R21 OPT
CCM
Q3
OPT
E7
JP2
NOTES:
GND
E9
GND
E10
A
1. FOR SYNCHRONIZATION REMOVE JUMPER JP2 'MODE'
AND CONNECT SOURCE OF THE SYNC SIGNAL TO
TERMINALS E8 'SYNC' AND E9 'GND'
2. FOR Q1 AND Q2 FOLLOWING MOSFETs CAN BE USED
RJK0651DPB,
RENESAS
HAT2266H,
RENESAS
BSC100N06LS3G, INFINEON
2. FOR C16 FOLLOWING CAPACITORS CAN BE USED
4TPE330MIC2,
SANYO
6TPE330MIC2,
SANYO
5
4
CUSTOMER NOTICE
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
TECHNOLOGY
AK
VICTOR K
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
LOW QUIESCENT CURRENT HIGH VOLTAGE STEP-DOWN CONVERTER
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
LTC3891EFE
REV.
1
DEMO CIRCUIT 1695B
Friday, July 06, 2012
SHEET 1
1
OF 1
A
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