WM8352
Production Data
9.2 DC-DC CONVERTERS
9.2.1
POWER EFFICIENCY
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
DCDC1
DCDC1
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
ACTIVE
ACTIVE
VIN = 3.0V
VIN = 3.0V
60
STANDBY
VIN = 3.7V
VIN = 4.2V
VIN = 3.7V
STANDBY
50
40
30
20
10
0
VIN = 3.0V
VIN = 4.2V
VIN = 3.0V
VIN = 3.7V
VIN = 3.7V
VIN = 4.2V
VIN = 4.2V
VOUT = 1.2V
VOUT = 1.8V
0.001
0.01
0.1
1
0.001
0.01
0.1
1
LOAD (A)
LOAD (A)
Figure 1 DC-DC1 Efficiency Vs Load Current Vo=1.8V
Figure 2 DC-DC1 Efficiency Vs Load Current Vo=1.2V
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
DCDC3
DCDC2
100
100
90
80
90
80
70
60
70
ACTIVE
VIN = 3.0V
60
VIN = 3.7V
VIN = 3.1V
STANDBY
50
40
30
20
10
0
50
VIN = 4.2V
VIN = 3.0V
VIN = 3.7V
40
VIN = 4.2V
VIN = 3.7V
VIN = 4.2V
30
20
VOUT = 20.0V
VOUT = 1.8V
10
0
0.001
0.01
0.1
0.001
0.01
0.1
1
LOAD (A)
LOAD (A)
Figure 3 DC-DC3 Efficiency Vs Load Current Vo=1.8V
Figure 4 DC-DC2 Efficiency Vs Load Current Vo=20V
PD, February 2011, Rev 4.4
28
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
