DC799A - Schematic

5
4
3
D1 (opt.)
PEMG2010EA
2
1
L1
3.3uH
2 (opt.) 1nF(opt.)
Vin
2.7V-5.5V
Vin
9
E1
+ C2
47uF
10V
GND
E4
Iout
2.5V
1.1A
2.7V
1.2A
CIN
10uF
6.3V
1
SW1
SW2
CSS
0.01uF
1
DISABLE
2
ENABLE
3
RLIM
10
CLIM
1nF
2
1
FB
VC
11
15K
RT
BURST
SGND
C5
0.1uF
opt.
A
R4
221K
5
E3
GND
470pF
C
R3
200K
C4
0.1uF
Average Input Current Limit
3
JP3
MODE
1
2
FIXED FREQ.
3
BURST MODE
B
AUTO ON
Vin
R7
opt.
CUSTOMER NOTICE
CONTRACT NO.
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
APPROVALS
DRAWN
4
June Wu
DATE
5/4/04
CHECKED
ENGINEER DongYan Zhou
5/4/04
DESIGNER
Monday, November 08, 2004
3
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
TITLE
LTC3442EDE, High Efficiency Synchronous Buck-Boost Converter
APPROVED
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
C3
1uF
1M(opt.)
2
opt.
COUT
47uF
6.3V
JP2
2
Q1
2N7002
opt.
1
CFF
220pF
CP
PGND
3
E2
RFF
2.2K
Vout
[email protected]
C6
opt.
7
4
R5
3
R6
RZ
RLIM
Optional Current Foldback
Vout
Vout
8
12
B
RLIM
D
U1
LTC3442EDE
VOUT
SHDN/SS
RT
43.2K
RUN
6
R2
340K
RLIM
143K
JP1
Vout SHDN
PEMG2010EA
4
VIN
1
D2 (opt.)
1
RSS
1MEG
C
Vin(min)
2
C1
R1
D
2
A
with Automatic Burst Mode
SIZE CAGE CODE
SCALE:
FILENAME:
2
DWG NO
REV
A
DC799A
SHEET
1
1
OF
1
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