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The chip specifies the “typical” LO output current as 1A, not an absolute maximum. It’s not current that kills a FET, it’s overheating. As long as that doesn’t cause it to get hotter than its maximum junction temperature, no harm will be done.
My thinking is this should lead to current peaks that easily exceed the driver’s 1A maximum peak current and damage the chip, but the evaluation board demonstrates that this is not the case, what am I missing?
So if you just short its output to ground, it will die. Email Required, but never shown. At t 0 any capacitor will act like a short circuit. On page 4, bottom right, there’s a graph showing the maximum safe operating area SOA of the device. If the pulse is short enough, the FET dahasheet not heat up much and therefore survive just fine.
Sierra IC Inc
The current might be internally limited.
(PDF) IRLML2803 Datasheet download
It won’t be able to deliver 1A or more continuously, however – it can only do that for short pulses. The FET can’t get datashete of that heat but will absorb it in its thermal mass instead, heating up a little. MOSFETs like the ones in the MIC’s output stage can handle large current pulses for a short time by simply absorbing the heat generated by the pulse in their thermal mass.
This current is limited by its internal output resistance since there doesn’t seem to be a limiting circuit according to the datasheet’s diagram of the output stage.
Sign up irrlml2803 Email and Password. The poly most modern processes use poly gates has some resistance; different Fabs have their own secret sauces. Unimportant 1 6.
DATASHEET IRLMLTRPBF – International Rectifier MOSFET P Micro3 | eBay
Without a gate resistor the only thing limiting the current is the gate driver’s output resistance, which is supposedly low, it would not be a good driver otherwise. It will survive rilml2803 pulse of 7A at 20V just fine as long as it’s only 10 microseconds long. I would place a 0 ohm resistor there for future experimentation.
That’s W dissipated in a SOT device. In fact, the datasheet for the MIC states: