WLED BIAS DC/DC CONVERTER

ACT8740

Rev PrB, 25-Feb-08

- 20 -

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Copyright © 2008 Active-Semi, Inc.

ActivePMU

I

ELECTRICAL CHARACTERISTICS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Voltage Range

2

5.5

V

UVLO Voltage Threshold

VSYS Voltage Rising

2.9

3

3.1

V

UVLO Voltage Hysteresis

VSYS Voltage Falling

80

mV

Supply Current

75

150

0.1

1

FB2 Feedback Voltage

235

255

275

mV

FB2 Input Current

50

nA

Oscillator Frequency

1.35

1.6

1.85

MHz

Maximum Duty Cycle

85

90

%

Switch Current Limit

500

750

mA

Switch On-Resistance

0.67

1.1

Ω

Switch Leakage Current

10

µA

Over Voltage Threshold

VSET[ ] = [111111]

27.5

28.5

29.5

V

µA

Minimum On-Time

100

ns

: 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.