FireWire Current Limiter and Low-Drop

ORing Switch Controller

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3

ELECTRICAL CHARACTERISTICS (continued)

(Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GATE2 Pulldown Current During

Any GATE2 Turn-Off Condition

80

125

200

mA

GATE1 (ORing control)

OR_ADJ = GND

3

5

7

OR_ADJ = floating

5.5

7.5

9.5

ORing Switch Turn-On Current

Threshold Voltage

OR_ADJ = IN

8.5

10.5

12.8

mV

ORing Switch Turn-On Current

Threshold Voltage Hysteresis

0.5

mV

GATE1 Pullup Current

(Note 5)

36

45

54

µA

7.5V

4.25

5.5

6.5

GATE1 High Voltage

8V

4.5

5.5

6.5

V

GATE1 Turn-Off Switch On-

Resistance

Measured between GATE1 and SENSE

23

Ω

LOGIC INPUTS

Current into or out of input for tri-state logic

condition

-3

+3

Current out of input for logic low

20

ILIM, OR_ADJ Input-Logic

Tristate Current Tolerance

(Note 6)

Current into input for logic high

20

µA

0.7

V

LATCH, ONQ1 Input-Logic Low

Voltage

1µA

LATCH, ONQ1 Input-Logic High

Voltage

1.8

V

LATCH, ONQ1 Input Current

1µA

TIM, ILIM, LATCH, OR_ADJ,

OUT, ONQ1 Shutdown Mode

Input Current

≤ 0.4V

1

µA

FAULT Output Low Voltage

0.12

0.25

V

FAULT Output High Leakage

Current

1

µA

TIMING

TIM = IN

1.78

2.02

2.26

ms

Ω

0.87

1.04

1.21

ms

Ω

9.2

11.05

12.9

ms

Current-Limit Timeout

(MAX5943A)

Current-limit mode

(Note 7)

TIM = floating

120

175

225

ms