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STW41412/T Datasheet(PDF) 14 Page - STMicroelectronics

Part # STW41412/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

STW41412/T Datasheet(HTML) 14 Page - STMicroelectronics

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2 Electrical Characteristics
STw4141
14/27
2.11
Efficiency in PWM
The efficiency of a switching regulator is equal to the total output power divided by the input.
STw4141 has high efficiency up to 92% (for the 2 outputs). Efficiency curve is flat over the
output current range.
Figure 9.
Switching regulator efficiency in PWM mode
1
20
40
60
80
100
120
140
160
180
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 in PWM mode @ VIN=2.7V, TA= 25°C
1
20
40
60
80
100
120
140
160
180
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 in PWM mode @ VIN=3.6V, TA= 25°C
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
IOUT2 = 200 mA
IOUT2 = 400 mA
Efficiency vs IOUT1@IOUT2 PWM 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
V
OUT2 = 1.2V
I
OUT2 = 0 mA
I
OUT2 = 200 mA
IOUT2 = 400 mA
Efficiency vs IOUT1@IOUT2 PWM mode, TA=25°C
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
IOUT2 (mA)
VIN = 2.7V
VOUT1 = 1.8V
VOUT2 = 1.2V
I
OUT1 = 0 mA
IOUT1 = 100 mA
IOUT1 = 200 mA
Efficiency vs IOUT2@IOUT1, PWM mode, TA=25°C
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
IOUT2 (mA)
VIN = 3.6V
VOUT1 = 1.8V
VOUT2 = 1.2V
I
OUT1 = 0 mA
IOUT1 = 100 mA
IOUT1 = 200 mA
Efficiency vs IOUT2@IOUT1, PWM mode, TA=25°C



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