wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 28

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8351
9.2
Figure 1 DC-DC1 Efficiency Vs Load Current Vo=1.8V
Figure 3 DC-DC3 Efficiency Vs Load Current Vo=1.8V
w
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
DC-DC CONVERTERS
0
0
0.001
0.001
STANDBY
V
V
V
0.01
STANDBY
V
0.01
IN
IN
V
V
IN
IN
IN
IN
= 3.0V
= 3.7V
= 4.2V
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
= 4.2V
= 3.0V
= 3.7V
9.2.1
LOAD (A)
DCDC1
LOAD (A)
DCDC3
POWER EFFICIENCY
0.1
0.1
V
V
OUT
OUT
ACTIVE
V
V
V
V
IN
IN
IN
IN
= 1.8V
= 1.8V
V
= 3.7V
= 4.2V
ACTIVE
V
= 3.0V
IN
= 4.2V
IN
= 3.7V
= 3.0V
1
1
Figure 2 DC-DC1 Efficiency Vs Load Current Vo=1.2V
Figure 4 DC-DC2 Efficiency Vs Load Current Vo=20V
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0.001
0
0.001
V
0.01
IN
STANDBY
V
V
IN
= 4.2V
IN
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
= 3.0V
= 3.7V
LOAD (A)
DCDC1
LOAD (A)
DCDC2
0.01
V
IN
= 3.1V
PD, June 2009, Rev 4.1
0.1
V
IN
= 3.7V
ACTIVE
V
IN
V
OUT
V
= 4.2V
Production Data
V
OUT
IN
= 1.2V
V
= 4.2V
V
= 20.0V
IN
IN
= 3.7V
= 3.0V
1
0.1
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