wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 18

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

WM8351
7.2
Test Conditions
T
DC-DC2
Input voltage
range
Output voltage
range
USB OTG output
voltage
Output current
Switch resistance
Maximum switch
current
Switching
frequency
Maximum duty
cycle
Efficiency
Quiescent current
Regulated
feedback voltage
Undervoltage
detect
Overvoltage
detect
Peak inductor
current limit
On resistance of
NGATE driver
Input capacitor
Inductor
Inductor current
rating
Output capacitor
w
A
PARAMETER
= +25ºC unless otherwise noted.
DC-DC STEP UP CONVERTER ELECTRICAL CHARACTERISTICS
I
f
SYMBOL
SW,MAX
CLK
V
V
V
R
V
V
V
OUT,USB
I
V
D
C
USB,UV
USB,OV
SAT,Lf
I
R
V
NGATE
V
CURR
FB,UV
FB,OV
C
OUT
I
I
L
OUT
MAX
OUT
Η
DD
PK
ON
FB
IN
IN
F
when used as converter
when used as switch
by default
(needs external component configuration)
V
DC2_FBSRC [1:0]=11
V
(DC2_ILIM_=1)
V
(DC2_ILIM_=1)
V
V
V
audio section active; audio sample rate of
11.025kHz, 22.05kHz or 44.1kHz
V
V
V
Shutdown or switch configuration
active; no switching
active; pulse skipping
DC2_FBSRC [1:0] = 00
DC2_FBSRC [1:0] = 01 or 10
below feedback voltage
DC2_FBSRC [1:0] = 11
above feedback voltage
DC2_FBSRC [1:0] = 11
V
DC2_ILIM_=1
P-Channel FET (I
N-Channel FET (I
X5R/X7R dielectric
DC2_ILIM_=1
DC2_FBSRC [1:0]= 00 or 11; V
DC2_FBSRC [1:0]= 00; V
DC2_FBSRC [1:0]= 00; V
DC2_FBSRC [1:0]= 01 or 10; V
DC2_FBSRC [1:0]= 01 or 10; V
DC2_FBSRC [1:0]= 01 or 10; V
IN
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
<4.5V; I
=3.3V; V
=1.8V; V
=1.2V; V
=3V; f
=3.8V; V
=3.8V; V
=3V; V
=20V
=5.0V
CLK
OUT
OUT
OUT
OUT
OUT
OUT
OUT
=1024kHz
=90%;
<100mA;
=3.2V; +25°C
=1.7V; +25°C
=1.1V; +25°C
=20V; I
=5.0V; I
CONDITIONS
PFET
NFET
=100mA)
=100mA)
OUT
OUT
=20mA
OUT
OUT
=100mA
=10V
=20V
OUT
OUT
OUT
OUT
=5V
=10V
=15V
=20V
-30%
0.84
0.18
500
320
MIN
2.7
1.2
V
1.0
3.7
2.0
1.5
0.9
0
IN
940.8
1024
0.26
0.41
0.84
0.47
TYP
260
260
700
450
3.7
5.0
0.1
0.5
0.5
4.6
5.4
4.6
4.9
2.2
2.2
4.7
2.2
1.5
90
75
88
12
10
10
8
+30%
PD, June 2009, Rev 4.1
(100)
MAX
(30)
(18)
170
700
5.5
4.7
1.0
4.7
20
40
22
10
10
UNITS
Production Data
kHz
mA
mA
mA
mA
μH
uA
μF
μF
%
%
%
%
Ω
Ω
V
V
V
V
V
V
18