MAX5943 Maxim Integrated Products, MAX5943 Datasheet - Page 17

• Manufacturer Part Number: MAX5943
• Description: FireWire Current Limiter and Low-Drop ORing Switch Controller
• Manufacturer: Maxim Integrated Products

If IN or OUT experiences a fast voltage transient, the
drain-to-gate parasitic capacitance of Q1 and/or Q2
may be sufficient to briefly enhance one of the transis-
tors, allowing current glitch. If the circuit is subjected to
large transients, connect capacitors from the gate to
source across the appropriate MOSFET, preventing the
parasitic capacitance from turning on the device.
Caution: The additional gate-to-source capacitance
causes the turn-off time of the MOSFETs to increase due
to the additional charge of the capacitor. Use the mini-
mum capacitor value to prevent currents from flowing in
hot-plug situations.
______________________________________________________________________________________
FireWire Current Limiter and Low-Drop
Transient Protection
ORing Switch Controller
Figure 12. Power Dissipated Across MOSFETs During a Short-
Circuit Fault for MAX5943B–MAX5943E
V
IN
IN
R
SENSE
MAX5943B–MAX5943E
SENSE GATE1
R
DS(ON)1
R
GATE2
DS(ON)1
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OUT
ISC
17