WLED BIAS DC/DC CONVERTER

Rev0, 25-Feb-08

ACT8712

- 23 -

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Copyright © 2008 Active-Semi, Inc.

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I

ELECTRICAL CHARACTERISTICS

: 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.

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

µA

0.1

1

µA

FB3 Feedback Voltage

235

255

275

mV

FB3 Input Current

50

nA

Oscillator Frequency

1.35

1.6

1.85

MHz

Minimum On-Time

100

ns

Maximum Duty Cycle

87

92

%

Switch Current Limit

500

750

mA

Switch On-Resistance

0.67

1.1

Ω

Switch Leakage Current

10

µA

Over-Voltage Threshold

REG3/VSET[ ] = [111111]

27.5

28.5

29.5

V