RT9278
Input Voltage Output Voltage
(V)
(V)
1.5~3.0
1.5~3.3
3.0~4.5
3.3
5.0
5.0
L
(µH)
2.2
2.2
2.2
Preliminary
Table 1. Component Selection for Figure 6 (L=2.2µH)
C
OUT
(µF)
40
40
40
R1
(kΩ)
150
130
130
R2
(kΩ)
470
680
680
R
COMP
(kΩ)
43
24
24
C
COMP
(nF)
5.6
8.2
3.9
C
FF
(pF)
18
12
12
Table 2. Component Selection for Figure 6 (L=4.7µH)
Input Voltage Output Voltage
(V)
(V)
1.5~3.0
1.5~3.3
3.0~4.5
3.3
5.0
5.0
L
(µH)
4.7
4.7
4.7
C
OUT
(µF)
40
40
40
R1
(kΩ)
150
130
130
R2
(kΩ)
470
680
680
R
COMP
(kΩ)
24
24
24
C
COMP
(nF)
10
15
8.2
C
FF
(pF)
18
12
12
Table 3. Component Selection for Figure 6 (L=6.8µH)
Input Voltage Output Voltage
(V)
(V)
1.5~3.0
1.5~3.3
3.0~4.5
3.3
5.0
5.0
L
(µH)
6.8
6.8
6.8
C
OUT
(µF)
40
40
40
R1
(kΩ)
150
130
130
R2
(kΩ)
470
680
680
R
COMP
(kΩ)
24
24
24
C
COMP
(nF)
15
22
12
C
FF
(pF)
18
12
12
Table 4. Component Selection for Figure 6 (L=10µH)
Input Voltage Output Voltage
(V)
(V)
1.5~3.0
1.5~3.3
3.0~4.5
3.3
5.0
5.0
L
(µH)
10
10
10
C
OUT
(µF)
40
40
40
R1
(kΩ)
150
130
130
R2
(kΩ)
470
680
680
R
COMP
(kΩ)
24
24
24
C
COMP
(nF)
22
33
18
C
FF
(pF)
18
12
12
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DS9278-04 August 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
