DC549A - Schematic

5
D3
MMSD914T1
(Opt.)
2
1
E1
+ C10
(Opt.)
E2
3
4
6
Vin
Vin
BOOST
15
SHDN
SW
2
14
SYNC
SW
5
E4
C
7
NC
13
NC
1
Gnd
8
Gnd
BIAS
Gnd
Vc
9
16
11
R4
(Opt.)
Gnd
C
D1
30BQ060
SMC
R6
(Opt.)
3
C1
220pF
1
2
C2
.015uF
Q1
MMBT2222A
(Opt.)
NOTE: UNLESS OTHERWISE SPECIFIED
R5
(Opt.)
B
LINEAR TECHNOLOGY CORPORATION
For All Optional Components On Boards:
Q1,R5,R6,C9 Show Ref. Des. And Outline
D3,D4 Show Ref. Des. With No Outline
C6,C7,C8,C10,R4 Show No Ref. Des. And No Outline
1630 McCARTHY BLVD.
MILPITAS, CA 95035
PHONE (408) 432-1900
FAX (408) 434-0507
* High Vin Possible ( Up to 60V)
With Thermal Constraints. See Quick Start Guide
Title
Size
4
3
A
3A, 500kHz High Voltage Buck Converter
Document Number
DC549A
Date: Tuesday, September 03, 2002
5
E6
Vout
[email protected]
C5
47uF
6.3V
Cer
C8
(Opt.)
12
R1
1.5K
A
C6
(Opt.)
0805
10
R3
4.99k
1%
B
E5
2
C9
(Opt.)
R2
15.4k
1%
Gnd
D
L1
10uH
UP2B-100
1
U1
LT3431EFE
FB
1
D4
SMAZ7V5
(Opt.)
2
1
C4
0.22uF
16V
E3
SYNC
D2
MMSD914T1
SOD123
1
2
C3
2.2uF
100V
Gnd
SHDN
2
1
Vin
7.5V-20V*
3
2
D
4
2
LT3431EFE
Sheet
1
of
1
Rev
1
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