SC4521 데이터 시트보기 (PDF) - Semtech Corporation
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SC4521 Datasheet PDF : 18 Pages
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POWER MANAGEMENT
Application Information (Cont.)
Design Example 1: 5V to 1V at 2A
SC4521
VI = 5V
R0
0 C3
10u
D1
Css
100n
2 IN
5 EN
8 SS
SW 3
FB 6
COMP 7
SC4521
C5
560p
C1
0.22u
C4
18n
R3
20k
L1
3.9uH
R1
2.49k
Vo=1V @2A
Co
470u
R2
10k
D2
Note: The bottom pad needs a big copper area to remove the heat.
Bill of Materials
Item
Qty
Reference
Value
1
1
C1
0.22uF, 25V, 0805, X7R
2
1
Co
470uF, 10V, ZA
3
1
C3
10uF
4
1
C4
18nF, 0805, X7R, 25V
5
1
C5
560pF, 50V, 0805
6
1
D1
1N4148SW, SOD323
7
1
D2
EC30LA02
8
1
L1
3.9uH
9
1
R0
0, 0805
10
1
R1
2.49k, 1%, 0805
11
1
R2
10k, 1%, 0805
12
1
R3
20k, 1%, 0805
13
-
R4
not used, 0805
14
1
Css
100nF
15
1
U1
SC4521
Unless specified, all resistors have 1% precision with 0805 package.
Resistors are +/-1% and all capacitors are +/-20%
2007 Semtech Corp.
11
Part No./Manufacturer
Vishay: VJ0805Y224KXX
Rubicon
TDK: C3216OJ106MT
Vishay
Vishay
Nihon Inter Electronics Corp.
Sumida: RCR875DNP-3R9L
SMTZONE
Semtech
www.semtech.com
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