Rainbow Electronics MAX5943 - Manual (Page 3)

MAX5943
FireWire Current Limiter and Low-Drop
ORing Switch Controller
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ELECTRICAL CHARACTERISTICS (continued)
(V IN = 7.5V to 37V, GND = 0V, and T A = -40°C to +85°C, unless otherwise noted. Typical values are at V IN = 12V, T A = +25°C.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE2 Pulldown Current During
Any GATE2 Turn-Off Condition
I G2OFF V GATE2 = V OUT + 4.5V (Note 4) 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
V OR (V IN - V SENSE ) rising
OR_ADJ = IN 8.5 10.5 12.8
mV
ORing Switch Turn-On Current
Threshold Voltage Hysteresis
(V IN - V SENSE ) falling 0.5 mV
GATE1 Pullup Current I G1U (Note 5) 36 45 54 µA
7.5V
≤
V IN
≤
8V 4.25 5.5 6.5
GATE1 High Voltage V G1 V GATE1 - V SENSE
8V
≤
V IN
≤
37V 4.5 5.5 6.5
V
GATE1 Turn-Off Switch On-
Resistance
R G1
Measured between GATE1 and SENSE
when (V
IN - V SENSE ) < V OR
2 3
Ω
LOGIC INPUTS
I IX
Current into or out of input for tri-state logic
condition
-3 +3
I
IXL
Current out of input for logic low 20
ILIM, OR_ADJ Input-Logic
Tristate Current Tolerance
(Note 6)
I IH Current into input for logic high 20
µA
V IL V ON > V ON_REF 0.7 V
LATCH, ONQ1 Input-Logic Low
Voltage
I IL LATCH, ONQ1 = GND, V ON > V ON_REF 1 µA
LATCH, ONQ1 Input-Logic High
Voltage
V IH V ON > V ON_REF 1.8 V
LATCH, ONQ1 Input Current I IH All voltages = V IN , V ON > V ON_REF 1 µA
TIM, ILIM, LATCH, OR_ADJ,
OUT, ONQ1 Shutdown Mode
Input Current
I IH_SD All voltages = V IN , V ON
≤
0.4V 1 µA
FAULT Output Low Voltage V OL Low-impedance state, I FAULT = 5mA 0.12 0.25 V
FAULT Output High Leakage
Current
I OH High-impedance state, V FAULT = 37V 1 µA
TIMING
TIM = IN 1.78 2.02 2.26 ms
R TIM = 4k
Ω
0.87 1.04 1.21 ms
R TIM = 50k
Ω
9.2 11.05 12.9 ms
Current-Limit Timeout
(MAX5943A)
t ILIM
Current-limit mode
(Note 7)
TIM = floating 120 175 225 ms