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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: LMG1025
Date: Thu, 10 Jul 2025 02:14:42 -0000 (UTC)
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john larkin <jl@glen--canyon.com> wrote:
> On Wed, 09 Jul 2025 07:32:08 -0700, john larkin <jl@glen--canyon.com>
> wrote:
> 
>> On Wed, 9 Jul 2025 10:58:13 -0000 (UTC), piglet
>> <erichpwagner@hotmail.com> wrote:
>> 
>>> john larkin <jl@glen--canyon.com> wrote:
>>>> On Tue, 8 Jul 2025 18:36:01 -0400, Phil Hobbs
>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>> 
>>>>> On 2025-07-07 20:11, john larkin wrote:
>>>>>> It's a TI GaNfet lowside gate driver. Insane specs.
>>>>>> 
>>>>>> It's a nasty little leadless package. There's an even faster BGA
>>>>>> version.
>>>>>> 
>>>>>> I wish there was a higher-voltage version, for driving SiC parts.
>>>>>> 
>>>>> 
>>>>> Yikes, nine bucks in onesies.
>>>> 
>>>> That's in the noise floor for the products that we have in mind. But
>>>> it will cost a lot more than the fets we will be driving.
>>>> 
>>>> What's interesting is that the schematic on the data sheet seems to
>>>> show a p-channel GaN fet... on chip!
>>>> 
>>>>> 
>>>>> Pretty cool driving  5V into 220 pF in 650 ps, for sure.
>>>>> 
>>>>> Cheers
>>>>> 
>>>>> Phil Hobbs
>>>> 
>>> 
>>> I took that to be a regular silicon p-ch fet. Although the chip is intended
>>> to drive GaN devices isn’t it itself regular silicon- does the datasheet
>>> say it is fabricated from GaN?
>> 
>> But the performance is amazing, if it is silicon.
>> 
>> My alternative GaN gate driver would be a *lot* of Tiny Logic gate
>> sections in parallel. Som of those are about as fast.
>> 
>> We are also considering using a BUF602, 1 GHz bandwidth and 350 mA
>> out, but it would need weird positive and negative supplies.
>> 
>> We'll try all the above. 
>> 
>> I really want a fast SiC gate driver too. That would need close to 20
>> volts swing. Most SiC drivers are isolated (which we don't need) and
>> have huge prop delays, and probably correspondingly high jitter.
>> 
>> My summer interns are playing with fast high voltage switchers on the
>> theory that a product might emerge somehow.
> 
> I does sound like people are putting several semi types on one chip.
> 
> https://compoundsemiconductor.net/home
> 
> 
> 

In one package, anyway.  

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics