DC924A - Schematic

5
4
D
3
2
VIN
R2
R1
10K opt.
10K opt.
VIN
U1
LTC3772BEDDB
JP1
1.8V
ADJ1
2
3
ITH/RUN
SW
6
2
VFB
VIN
7
1
GND
PGATE
8
3
3.3V
5
4
6
Rf1
82.5K
174K
C
4.7uH
Cf1
E3
L2
22pF
1.0uH
D2
MBRD835L
opt.
D1
B220A
1
B
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.
5
Q3
NTMS5P02R2
opt.
L1
Rf4
56.2K
A
4
Q2
NTMS5P02R2
opt.
5
6
7
8
Rf3
4
2.5V
4
Q1
FDC638P
Rf2
140K
3
1
2
3
N/C
GND
5
6
7
8
680pF
20K
IPRG
D
E2
4
Cout1
47uF
6.3V
opt.
Cout2
100uF
6.3V
opt.
Cout3
100uF
6.3V
opt.
C3
1uF
6.3V
opt.
CONTRACT NO.
APPROVALS
DRAWN
June Wu
DATE
4/18/05
CHECKED
TECHNOLOGY
B
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC3772BEDDB, 550kHz Step-Down DC/DC Converter
Walker Bai
4/18/05
DESIGNER
Tuesday, August 23, 2005
3
GND
TITLE
APPROVED
ENGINEER
VOUT
1.8V/2.5V/3.3V
@2A
C4
opt.
E4
3
Rc1
5
E1
+ C2
47uF
10V
opt.
1
2
5
6
C
Cc1
4
Cin3
47uF
10V
opt.
VIN
3V-8V
4
opt.
1
2
3
Cc2
Cin2
47uF
10V
opt.
Cin1
22uF
10V
ITH/RUN
E6
1
SIZE
CAGE CODE
SCALE:
DWG NO
FILENAME:
2
REV
A
DC924A
SHEET
A
1
1
OF
1
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