DC797A - Schematic

5
4
*
3
2
D3 IS RECOMMENDED FOR VIN>4.5V.
PLEASE REFER TO DATASHEET FOR DETAILS.
SUMIDA
CDRH4D28C/100
L1
10UH
1
2
2
2
*
1
VIN
+C8
C1
10UF
6.3V
1206
47UF,10V
TAJB
R4
1M
3
7
SHDN
8
2
1
SW2
VIN
SHDN/SS
C6
0.047UF
R1
340K
1%
VOUT 6
FB 9
R3
MODE/SYNC VC 10
RT
GND 5
SYNC
E3
C7
1UF
6.3V
0603
R5
2.2K
E5
GND
C5
10PF
R7
4.87M
R6
60.4K
1%
C2
22UF,6.3V
1210
C4
560PF
15K
R8
6.19M
E2
C
R2
200K
1%
SYNC
VIN
B
BURST
MODE
1
2
GND
C3
180PF
4
11
C
SW1
E4 VOUT
3.3V
VOUT
PHILIPS
U1
LTC3440EDD
D3
POWERMITE
ON SEMI
OPT
D1
PMEG2010EA
PHILIPS
D
D2
PMEG2010EA
2
1
GND
1
D
VIN E1
2.5V-5.5V
1
FIXED
FREQ.
3
SHDN
1
B
JP1
2
JP2
RUN
3
VIN
IOUT
2.5V
540mA
2.7V
600mA
NOTES: UNLESS OTHERWISE SPECIFIED
A
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPS. ARE 0402.
2. INSTALL SHUNTS ON JP1 AND JP2 PIN 2 AND 3.
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
TECHNOLOGY
DRAWN:
CHECKED: KIM T.
APPROVED:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE:
A
1MHz SYNCHRONOUS BUCK-BOOST IN 3mm X 3mm DFN
ENGINEER:
DONGYAN Z. SIZE
DESIGNER:
A
DWG NO.
DC797A-1*LTC3440EDD
DATE: Friday, August 20, 2004
2
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