WM8352
Production Data
7.2 DC-DC STEP UP CONVERTER ELECTRICAL CHARACTERISTICS
Test Conditions
TA = +25ºC unless otherwise noted.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC-DC2 and DC-DC5
when used as converter
2.7
1.2
Input voltage
range
VIN
3.7
5.5
V
V
V
when used as switch
20
Output voltage
range
by default
VOUT
VIN
(needs external component configuration)
(30)
USB OTG output
voltage
VIN<4.5V; IOUT<100mA;
DCn_FBSRC [1:0]=11
VOUT,USB
5.0
VOUT=30V
25
VOUT=20V
40
(DCn_ILIM_=1)
(18)
Output current
IOUT
0
mA
170
VOUT=5.0V
(DCn_ILIM_=1)
(100)
VIN=3.3V; VOUT=3.2V; +25°C
VIN=1.8V; VOUT=1.7V; +25°C
VIN=1.2V; VOUT=1.1V; +25°C
0.26
0.41
0.84
Switch resistance
Maximum switch
RON
Ω
ISW,MAX
fCLK
DMAX
Η
700
mA
MHz
%
current
1.0
90
Switching
frequency
Maximum duty
cycle
VIN=3V; fCLK=1.0MHz
VIN=3.8V; VOUT=20V; IOUT=20mA
VIN=3.8V; VOUT=5.0V; IOUT=100mA
Shutdown or switch configuration
active; no switching
75
88
Efficiency
%
0.1
260
260
0.5
0.5
12
Quiescent current
IDD
uA
V
active; pulse skipping
VFB
DCn_FBSRC [1:0] = 00
DCn_FBSRC [1:0] = 01 or 10
below feedback voltage
DCn_FBSRC [1:0] = 11
above feedback voltage
DCn_FBSRC [1:0] = 11
VIN=3V; VOUT=90%;
Regulated
feedback voltage
VCURR
VFB,UV
VUSB,UV
VFB,OV
VUSB,OV
%
V
Undervoltage
detect
4.6
8
%
V
Overvoltage
detect
5.4
700
450
4.6
4.9
2.2
10
Peak inductor
current limit
IPK
mA
DCn_ILIM_=1
P-Channel FET (IPFET=100mA)
N-Channel FET (INFET=100mA)
X5R/X7R dielectric
On resistance of
NGATE driver
RNGATE
Ω
Input capacitor
Inductor
CIN
LF
1.0
-30%
500
320
3.7
μF
μH
+30%
Inductor current
rating
ISAT,Lf
mA
DCn_ILIM_=1
DCn_FBSRC [1:0]= 00 or 11; VOUT=5V
DCn_FBSRC [1:0]= 00; VOUT=10V
DCn_FBSRC [1:0]= 00; VOUT=20V
DCn_FBSRC [1:0]= 01 or 10; VOUT=10V
DCn_FBSRC [1:0]= 01 or 10; VOUT=15V
DCn_FBSRC [1:0]= 01 or 10; VOUT=20V
10
2.2
0.47
4.7
2.2
1.5
22
4.7
1.0
10
0.84
0.18
2.0
Output capacitor
COUT
μF
1.5
10
0.9
4.7
PD, February 2011, Rev 4.4
18
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
