ir3840 International Rectifier Corp., ir3840 Datasheet - Page 9

• Manufacturer Part Number: ir3840
• Description: Integrated 12a Synchronous Buck Regulator
• Manufacturer: International Rectifier Corp.

02/09/09
Typical Efficiency and Power Loss Curves
Vin=12V, Vcc=5V, Io=2A-12A, F
The table below shows the inductors used for each of the output voltages
in the efficiency measurement.
98
96
94
92
90
88
86
84
82
80
78
76
74
72
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1
1
Vout (V)
Vout (V)
1V out
1.2
1.2
1.5
1.5
1.8
1.8
3.3
3.3
1V out
2
1
1
5
5
2
3
3
1.2V out
L (uH)
L (uH)
1.2V out
0.22
0.22
0.36
0.36
0.56
0.56
0.6
0.6
4
s
1
1
1
1
4
=600kHz, Room Temperature, No Air Flow
5
5
Lo ad Cu rre n t (A)
Loa d Curre nt (A)
1.5V out
1.5V out
ETQP4LR36WFC
ETQP4LR36WFC
ETQP4LR56WFC
ETQP4LR56WFC
6
PA1320-221NL
PA1320-221NL
6
MPL104-0R6
MPL104-0R6
MPL105-1R0
MPL105-1R0
MPL105-1R0
MPL105-1R0
7
7
P/N
P/N
1.8V out
1.8V out
8
8
9
9
3.3V out
3.3V out
10
10
(mΩ)
(mΩ)
DCR
DCR
0.48
0.48
1.56
1.56
1.1
1.1
1.7
1.7
2.5
2.5
2.5
2.5
11
11
5V out
12
5V out
12
IR3840MPbF
9