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STW41414/T Datasheet(PDF) 15 Page - STMicroelectronics

Part # STW41414/T
Description  Single Coil Dual Output Step Down DC/DC Converter for Digital Base Band and Multimedia Processor Supply
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW41414/T Datasheet(HTML) 15 Page - STMicroelectronics

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STw4141
2 Electrical Characteristics
15/27
2.12
Efficiency in AUTO
The efficiency of a switching regulator is equal to the total output power divided by the input.
STw4141 has high efficiency up to 92% (both outputs) and always higher than 70% for output
currents higher than 1mA.
Figure 10. Switching regulator efficiency in auto mode
1
30
60
90
120
150
180
0
10
20
30
40
50
60
70
80
90
100
Efficiency (%)
IOUT2 (mA)
IOUT1 (mA)
90-100
80-90
70-80
60-70
50-60
40-50
30-40
20-30
10-20
0-10
Efficiency VS output currents IOUT1 and IOUT2, VIN = 2.7V, AUTO mode
1
40
80
120
160
200
0
10
20
30
40
50
60
70
80
90
100
Efficiency (%)
IOUT2 (mA)
IOUT1 (mA)
90-100
80-90
70-80
60-70
50-60
40-50
30-40
20-30
10-20
0-10
Efficiency VS output currents IOUT1 and IOUT2, VIN = 3.6V, AUTO mode
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
IOUT1 (mA)
V
IN = 2.7V
V
OUT1 = 1.8V
V
OUT2 = 1.2V
IOUT2 = 0 mA
I
OUT2 = 200 mA
IOUT2 = 400 mA
Efficiency VS IOUT1@IOUT2, AUTO mode, TA = 25°C
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
IOUT1 (mA)
V
IN = 3.6V
V
OUT1 = 1.8V
VOUT2 = 1.2V
IOUT2 = 0 mA
I
OUT2 = 200 mA
I
OUT2 = 400 mA
Efficiency VS IOUT1@IOUT2, AUTO mode, TA = 25°C
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
IOUT2 (mA)
V
IN = 2.7V
V
OUT1 = 1.8V
V
OUT2 = 1.2V
I
OUT1 = 0 mA
I
OUT1 = 100 mA
IOUT1 = 200 mA
Efficiency VS IOUT2@IOUT1, AUTO mode, TA = 25°C
0
10
20
30
40
50
60
70
80
90
100
110
100
1000
IOUT2 (mA)
V
IN = 3.6V
V
OUT1 = 1.8V
V
OUT2 = 1.2V
IOUT1 = 0 mA
IOUT1 = 100 mA
IOUT1 = 200 mA
Efficiency VS IOUT2@IOUT1, AUTO mode, TA = 25°C



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