sc4524d Semtech Corporation, sc4524d Datasheet - Page 16

• Manufacturer Part Number: sc4524d
• Description: 18v 2a Step-down Switching Regulator
• Manufacturer: Semtech Corporation

Table 5 lists the recommended inductance (L
voltages. The inductance is determined by assuming that the ripple current is 35% of load current I
parameters are calculated by assuming a 22mF low ESR ceramic output capacitor and a loop gain crossover frequency
of F
Recommended Component Parameters in Typical Applications
SW
/10.
Vin (V)
Table 5. Recommended inductance (L
3.3
12
5
Vo (V)
Typical Applications
1.5
2.5
1.5
2.5
3.3
1.5
2.5
3.3
7.5
10
5
Io (A)
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
Fsw (KHz)
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
1
) and compensation network (R
1
) and compensator (R
C2 (uF)
22
L1 (uH)
6.8
3.3
3.3
1.5
4.7
2.2
2.2
1.5
6.8
3.3
3.3
2.2
8.2
4.7
4.7
2.2
6.8
3.3
3.3
2.2
8.2
4.7
6.8
6.8
3.3
8.2
8.2
4.7
8.2
4.7
8.2
8.2
4.7
4.7
4.7
2.2
15
15
15
10
15
10
7
Recommended Parameters
, C
5
, C
R7 (K)
8
4.02
4.02
13.3
21.5
21.5
4.02
7.68
4.02
7.68
6.81
14.3
6.81
12.1
9.09
16.2
9.09
17.8
4.32
4.32
6.81
12.1
6.81
12.1
9.09
18.7
9.09
18.7
14.3
24.9
14.3
27.4
21.5
38.3
21.5
38.3
25.5
51.1
25.5
51.1
)
7.5
7.5
7
11
, C
5
, C
8
) for common input and output
C5 (nF)
0.82
0.82
0.82
0.68
0.82
0.68
0.82
0.82
0.68
0.68
0.68
0.68
0.82
0.68
0.68
0.68
0.82
0.68
0.82
0.68
0.82
0.68
0.82
0.68
0.82
0.68
0.82
0.68
3.3
3.3
3.3
3.3
2.2
1.5
3.3
3.3
1.5
1.5
1
1
1
1
O
. The compensator
SC4524D
C8 (pF)
10
22
10
22
10
22
10
22
10
22
16