MAX5943BEEE datasheet(4/20 Pages) MAXIM

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FireWire Current Limiter and Low-Drop

ORing Switch Controller

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 7.5V to 37V, GND = 0V, and TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = 12V, TA = +25°C.)

(Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TIM = IN or

TIM ≥ 3.4V

0.45

0.51

0.57

RTIM = 4kΩ

32.5

µs

RTIM = 50kΩ

228

345

403

µs

Circuit-breaker mode,

MAX5943B

TIM = floating

3.75

5.5

TIM = IN or

TIM ≥ 3.4V

0.89

1.00

1.13

RTIM = 4kΩ

µs

RTIM = 50kΩ

575

690

806

µs

Circuit-breaker mode,

MAX5943C

TIM = floating

7.5

10.9

TIM = IN

1.78

2.02

2.26

RTIM = 4kΩ

109

130

151

µs

RTIM = 50kΩ

1.15

1.38

1.61

Circuit-breaker mode,

MAX5943D

TIM = floating

21.9

TIM = IN or

TIM ≥ 3.4V

3.56

4.05

4.52

RTIM = 4kΩ

217

260

303

µs

RTIM = 50kΩ

2.3

2.76

3.23

Circuit-Breaker Timeout

(MAX5943B–MAX5943E) (Note 7)

tCB

Circuit-breaker mode,

MAX5943E

TIM = floating

Automatic Restart Delay After

Current-Limit/Circuit-Breaker

Timeout

tOFF

LATCH = GND (Note 8)

128 x

(tILIM

OR tCB)

GATE1 Turn-Off Time

(ORing Response Time)

tOR

From VOR trigger until (VGATE1 - VIN) < 1V,

CGATE1 = 10nF

100

Turn-Off Response Time

tON_OFF

Time from VON < (VON_OFF - Hysteresis)

until (VGATE2 - VOUT) < 1V, GATE2 = open

(Note 9)

0.34

0.6

µs

Minimum Delay from ON Low to

Low-Current Shutdown Mode

tSD

ON step from 1.3V to 0.4V

µs

Note 1: All min/max parameters are tested at +25°C and +85°C. Limits at -40°C are guaranteed by design.

Note 2: Measured at both VGATE2 = VOUT = 0V and VGATE2 = VOUT = VIN.

Note 3: The typical value of parameter VTHF is 1.5 x VTH.

Note 4: Current-Limit/Circuit-Breaker Timeout; IN or ON low.

Note 5: See the Typical Operating Circuit. Measured at VGATE1 = VSENSE.

Note 6: The tristate (“floating”) logic condition will be entered if the pin current is within these limits.

Note 7: RTIM is connected from TIM to GND. The maximum timeout period is enforced to prevent arbitrarily long operation in cur-

rent-limit mode. Therefore, the relationship between resistor value and timeout changes for large values of RTIM. See

Current-Limit Timeout vs. RTIM in the Typical Operating Characteristics for nominal values.

Note 8: Parameter tOFF is a direct multiple of tILIM (or tCB), so the limits for tOFF track the limits for tILIM (or tCB).

Note 9: If the ON voltage goes below VON_REF - Hysteresis, then GATE2 goes low immediately to disconnect power from the load

quickly (within tON_OFF).

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