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My thinking is this should lead to dxtasheet 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? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

I would place a 0 ohm resistor there for future experimentation.

MOSFET driver without gate resistor – Electrical Engineering Stack Exchange

The Apps Engineer likely will not have access to any Fab details. 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. The current might be internally limited. On page 4, bottom right, there’s a graph datwsheet the maximum safe operating area SOA of the device. Mahendra Gunawardena 1, 9 Unimportant 1 6.


At t 0 any capacitor will act like a short circuit. MOSFETs like the ones in the MIC’s output stage can handle large current pulses datassheet a short time by simply absorbing the heat generated by the pulse in their thermal mass.

In fact, the datasheet for the MIC states: So if you just short its output to ground, it will die. Sign up or log in Sign up using Google.

IRLML2803 Datasheet

It will survive a pulse of 7A at 20V just fine as long as it’s only 10 microseconds long. Home Questions Tags Users Unanswered. If the pulse is short enough, the FET will not heat up much and therefore survive just fine.

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IRLML2803 MOSFET. Datasheet pdf. Equivalent

That’s W dissipated in a SOT device. Without a gate resistor the only thing limiting the current is the datashest driver’s output resistance, which is supposedly low, it would not be a good driver otherwise.

It’s not current that kills a FET, it’s overheating. Sign up using Email and Password. By clicking “Post Your Answer”, you acknowledge that irlmml2803 have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The chip specifies the “typical” LO output current as 1A, not an absolute maximum.


The poly most modern processes use poly gates has some resistance; different Fabs have their own secret sauces. Email Required, but never shown. Datasehet long as that doesn’t cause it to get hotter than its maximum junction temperature, no harm will be done. Post as a guest Name. The FET can’t get rid of that heat but will absorb it in its thermal mass instead, heating up a little.

Owing to the fact that this gate driver features datasyeet dead-time and thus monitors the gate of the MOSFET to determine when it has fully turned off, a gate resistor prevents proper sensing of the actual gate.

Sign up using Facebook. It won’t be able to deliver 1A or more continuously, however – it can only do that for short pulses.

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