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AN2728 Datasheet(PDF) 7 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) 7 Page - STMicroelectronics

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AN2728
Selecting components for your applications
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2
Selecting components for your applications
This section provides information to assist in the selection of the most appropriate
components for your applications.
Figure 7 shows the typical application schematic.
2.1
Output voltage selection
The output voltage can be adjusted from 0.6 V up to input voltage (DMAX = 100 %) minus the
voltage drop across the PMOS switch and the DC resistance of the inductor by connecting a
resistor divider between the VFB pin and the output, thus allowing remote voltage sensing.
Figure 7.
Typical application schematic
V
IN
VFB
SW
GND
V
IN
V
OUT
2
3
EN
1
5
4
ST1S12_ADJ
L1
R1
C2
R2
C1
GND
OFF ON
V
IN
VFB
SW
GND
V
IN
V
OUT
2
3
EN
1
5
4
ST1S12_ADJ
L1
R1
C2
R2
C1
GND
OFF ON
Figure 8.
Drop vs. temperature
0
0.1
0.2
0.3
0.4
0.5
-75
-50
-25
0
25
50
75
100
125
150
175
T [°C]
V
OUT = 2.7 V, IOUT = 700 mA, Duty cycle = 100%
0
0.1
0.2
0.3
0.4
0.5
-75
-50
-25
0
25
50
75
100
125
150
175
T [°C]
V
OUT = 2.7 V, IOUT = 700 mA, Duty cycle = 100%



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