MC34280 Datasheet, PDF (8/20 Pages) ON Semiconductor – Power Supply & Management IC for Handheld Electronic Products

MC34280
TYPICAL ELECTRICAL CHARACTERISTICS (Cont’d)
Figure 10. Efficiency of VAUX versus Output
Current (VAUX = 20 V, L2 = 33 uH, Various VIN)
80%
75%
70%
65%
60%
55%
50%
1
Vin = 3V
Vin = 1.8V
Vin = 1.5V
Vin = 1V
3
5
7
9
11
13
15
IOUT_AUX, AUX OUTPUT CURRENT (mA)
Figure 11. Efficiency of VAUX versus Input
Voltage (VAUX = 20 V, L2 = 33 uH, Various IOUT)
80%
75%
70%
65%
60%
55%
50%
1
Iout = 1mA
Iout = 5mA
Iout = 10mA
Iout = 15mA
1.5
2
2.5
3
VIN, INPUT VOLTAGE (V)
Figure 12. Efficiency of VAUX versus Output
Current (VAUX = 5 V, L2 = 82 uH, Various VIN)
85%
80%
75%
70%
65%
60%
55%
50%
45%
40%
1
Vin = 3V
Vin = 2.4V
Vin = 1.8V
Vin = 1.5V
Vin = 1V
5
10
15
20
25
30
35
IOUT_AUX, AUX OUTPUT CURRENT (mA)
Figure 13. Efficiency of VAUX versus Input
Voltage (VAUX = 5 V, L2 = 82 uH, Various IOUT)
85%
80%
75%
70%
65%
50%
1
Iout = 1V
Iout = 5V
Iout = 10V
Iout = 15V
Iout = 25V
1.5
2
2.5
3
VIN, INPUT VOLTAGE (V)
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