ACT8740
Rev PrB, 25-Feb-08
WLED BIAS DC/DC CONVERTER
ELECTRICAL CHARACTERISTICS
(VVSYS = 3.6V, TA = 25°C, unless otherwise specified.)
PARAMETER
Input Voltage Rangec
TEST CONDITIONS
MIN
2
TYP
MAX
5.5
UNIT
V
UVLO Voltage Threshold
UVLO Voltage Hysteresis
VSYS Voltage Rising
2.9
3
3.1
V
VSYS Voltage Falling
80
mV
REG2/ON[ ] = [1], VFB2 = 0.3V
REG2/ON[ ] = [0], ILOAD = 0mA
75
150
1
Supply Current
µA
0.1
255
50
FB2 Feedback Voltage
FB2 Input Current
235
275
mV
nA
MHz
ns
Oscillator Frequency
Minimum On-Time
1.35
1.6
100
90
1.85
Maximum Duty Cycle
Switch Current Limit
Switch On-Resistance
Switch Leakage Current
Over Voltage Threshold
85
%
Duty = 83%, L = 22µH, COUT2 = 4.7µF
500
750
0.67
mA
Ω
I
SW2 = 100mA
SW2 = 30V, Regulator Disabled
VSET[ ] = [111111]
1.1
10
V
µA
V
27.5
28.5
29.5
c: As long as VSYS is within the VSYS operating range, this spec refers to the voltage range of the input that the inductor is connected
to.
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