STW41412/T ST-Ericsson Inc, STW41412/T Datasheet - Page 17

• Manufacturer Part Number: STW41412/T
• Description: IC CONV DC/DC STPDN 16-TFBGA
• Manufacturer: ST-Ericsson Inc
• Type: Step-Down (Buck)r

Specifications of STW41412/T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 1.3V, 1.8V
• Current - Output: 200mA, 400mA
• Frequency - Switching: 900kHz
• Voltage - Input: 2.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

Electrical characteristics
2.12
Figure 10. Switching regulator efficiency in auto mode
16/30
Efficiency VS output currents I
I
OUT1
180
150
(mA)
120
Efficiency VS I
Efficiency VS I
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
90
0
1
1
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.
60
V
V
V
V
V
V
IN
OUT1
OUT2
IN
OUT1
OUT2
30
= 2.7V
= 2.7V
= 1.8V
= 1.2V
= 1.8V
= 1.2V
1
OUT1
OUT2
OUT1
10
10
@I
@I
OUT2
I
OUT1
I
OUT2
and I
OUT1
(mA)
(mA)
, AUTO mode, T
, AUTO mode, T
OUT2
I
OUT2
100
(mA)
100
, V
IN
= 2.7V, AUTO mode
0
10
I
I
20
30
I
I
I
I
OUT1
OUT1
40
OUT2
OUT2
OUT2
OUT1
50
60
70
80
90
100
= 100 mA
= 200 mA
= 0 mA
= 200 mA
= 400 mA
= 0 mA
Efficiency (%)
A
A
90-100
80-90
70-80
60-70
50-60
40-50
30-40
20-30
10-20
0-10
= 25°C
= 25°C
1000
1000
Efficiency VS output currents I
200
I
OUT1
160
(mA)
Efficiency VS IOUT1@I
120
100
Efficiency VS I
90
80
70
60
50
40
30
20
10
100
0
90
80
70
60
50
40
30
20
10
0
80
1
1
V
V
V
V
V
V
IN
OUT1
OUT2
40
IN
OUT1
OUT2
= 3.6V
= 3.6V
= 1.8V
= 1.2V
= 1.8V
= 1.2V
1
OUT2
10
OUT1
10
@I
I
OUT1
OUT2
OUT1
I
OUT2
and I
(mA)
(mA)
, AUTO mode, T
, AUTO mode, T
OUT2
I
OUT2
100
100
(mA)
, V
IN
= 3.6V, AUTO mode
I
I
I
0
10
OUT2
OUT2
OUT2
20
30
40
I
I
50
I
OUT1
OUT1
60
70
OUT1
80
90
100
= 0 mA
= 200 mA
= 400 mA
= 100 mA
= 200 mA
= 0 mA
Efficiency (%)
A
A
= 25°C
= 25°C
90-100
80-90
70-80
60-70
50-60
40-50
30-40
20-30
10-20
0-10
1000
1000
STw4141