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AN2728 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN2728
Description  ST1S12 small synchronous buck converter
PDF  20 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2728 Datasheet(HTML) 16 Page - STMicroelectronics

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Demonstration board usage recommendation
AN2728
16/20
Figure 16.
Efficiency vs. inductor at VO = 1.8 V
Figure 17.
Efficiency vs. inductor at VO = 3.3 V
Figure 18.
Efficiency vs. input voltage
0
10
20
30
40
50
60
70
80
90
100
02
4
6
8
10
12
L [µH]
I
OUT=50mA
I
OUT=100mA
I
OUT=250mA
I
OUT=500mA
I
OUT=700mA
V
IN = 3.6 V, VOUT = 1.8 V,
C
IN = 4.7 µF, COUT = 10 µF
0
10
20
30
40
50
60
70
80
90
100
02
4
6
8
10
12
L [µH]
I
OUT=50mA
I
OUT=100mA
I
OUT=250mA
I
OUT=500mA
I
OUT=700mA
V
IN = 3.6 V, VOUT = 1.8 V,
C
IN = 4.7 µF, COUT = 10 µF
0
10
20
30
40
50
60
70
80
90
100
02
4
6
8
10
12
L [µH]
I
OUT=50mA
I
OUT=100mA
I
OUT=300mA
I
OUT=500mA
I
OUT=700mA
V
IN = 5 V, VOUT = 3.3 V,
C
IN = 4.7 µF, COUT = 10 µF
0
10
20
30
40
50
60
70
80
90
100
02
4
6
8
10
12
L [µH]
I
OUT=50mA
I
OUT=100mA
I
OUT=300mA
I
OUT=500mA
I
OUT=700mA
V
IN = 5 V, VOUT = 3.3 V,
C
IN = 4.7 µF, COUT = 10 µF
0
10
20
30
40
50
60
70
80
90
100
33.5
4
4.5
55.5
6
VIN [V]
I
OUT=50mA
I
OUT=100mA
I
OUT=250mA
V
OUT = 3.3 V, CIN = 4.7 µF,
C
OUT = 10 µF, L = 2.2 µH
0
10
20
30
40
50
60
70
80
90
100
33.5
4
4.5
55.5
6
VIN [V]
I
OUT=50mA
I
OUT=100mA
I
OUT=250mA
V
OUT = 3.3 V, CIN = 4.7 µF,
C
OUT = 10 µF, L = 2.2 µH



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