DC1105A - Schematic

A
100K
4
5
6
7
8
FC
SYNC
2
6.3V
C7
22uF
6.3V
C14
(OPT)
VIN
TP1
C10
10uF
6.3V
VIN
2.75V - 4.5V
7
8
22uF
6 RUN
R4
10K
1 PLLLPF
BOOST 10
BG 8
3 TRACK/SS
VFB
VFB 4
ITH 5
13
R5
(opt)
R9
1.18K 1%
590 1%
1
R8
R10 0
0.47uH
IHLP-2525CZ-01
+
C13
(OPT)
C1
47uF
6.3V
C2
47uF
6.3V
C11
10uF
6.3V
A
VOUT
[email protected]
TP6
R1
C4
680pF
C6
R2
5.1K
C5
33pF
GND
TP7
118K 1%
47pF
R3
59K
1%
TRACK/SOFT START
2 JP2
3
VIN
TRACK
SOFT START
GND
TP2
4
C12
0.22uF
7 IPRG
TP5
L1
1
TG 9
SW 12
5
6
2 SYNC/MODE
C9
10nF
2
LTC3822EDD-1
3
U1
TP4
TP8
Q1
FDS6898A
1
TP3
VIN
TRACK
+
C8
D1
CMDSH-3
TP10
R7
10K
IPRG
BURST
PS (Pulse Skipping)
VIN 11
PLLLPF
2
3
GND
RUN
MODE
JP1
SYNC
A
1
R6
VFB
B
B
B
C3
(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
CONTRACT NO.
APPROVALS
DRAWN
HELEN
DATE
9/08/06
CHECKED
TECHNOLOGY
TITLE
APPROVED
ENGINEER Charlie Zhao
9/08/06
DESIGNER
Monday, September 18, 2006
LTC3822EDD-1, Low Vin Synchronous Step-Down
Converter with Tracking and PLL
SIZE CAGE CODE
SCALE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
FILENAME:
B
DWG NO
REV
A
DC1105A
SHEET
1
OF
1
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