ir3841 International Rectifier Corp., ir3841 Datasheet - Page 9

• Manufacturer Part Number: ir3841
• Description: Integrated 8a Synchronous Buck Regulator
• Manufacturer: International Rectifier Corp.

02/09/09
Typical Efficiency and Power Loss Curves
Vin=12V, Vcc=5V, Io=1A-8A, Room Temperature, No Air Flow
The table below shows the inductors used for each of the output voltages
in the efficiency measurement.
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
97
95
93
91
89
87
85
83
81
1
1
Vout (V)
Vout (V)
1V out
1V out
1.2
1.2
1.5
1.5
1.8
1.8
3.3
3.3
1
1
5
5
2
2
1.2V out
1.2V out
L (uH)
L (uH)
0.36
0.36
0.36
0.36
0.36
0.36
1
1
1
1
1
1
3
3
L o ad C u rren t (A)
1.5V out
Lo ad C u rren t (A)
1.5V out
4
ETQP4LR36WFC
ETQP4LR36WFC
ETQP4LR36WFC
ETQP4LR36WFC
ETQP4LR36WFC
ETQP4LR36WFC
4
MPL105-1R0
MPL105-1R0
MPL105-1R0
MPL105-1R0
MPL105-1R0
MPL105-1R0
P/N
P/N
1.8V out
5
5
1.8V out
6
6
3.3V out
3.3V out
(mΩ)
(mΩ)
DCR
DCR
1.1
1.1
1.1
1.1
1.1
1.1
2.5
2.5
2.5
2.5
2.5
2.5
7
7
5V out
5V out
8
8
IR3841MPbF
9