Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Phil Hobbs Newsgroups: sci.electronics.design Subject: Re: LMG1025 Date: Thu, 10 Jul 2025 02:14:42 -0000 (UTC) Organization: A noiseless patient Spider Lines: 73 Message-ID: <104n7mi$l6kt$1@dont-email.me> References: <7c6f4ceb-68a3-39d6-e81c-1a70dde97cff@electrooptical.net> <104li05$6rmc$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 10 Jul 2025 04:14:44 +0200 (CEST) Injection-Info: dont-email.me; posting-host="a0ed25d1a40105c959e3515bee1e3d64"; logging-data="694941"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19GCQkN12VZH9CsiqxIKQRG" User-Agent: NewsTap/5.5 (iPhone/iPod Touch) Cancel-Lock: sha1:ENc8DYcBKgrl7x1ty6w88hcFFFE= sha1:WtPVMoXmGmxNoQdMyCMYM8IqN0Y= john larkin wrote: > On Wed, 09 Jul 2025 07:32:08 -0700, john larkin > wrote: > >> On Wed, 9 Jul 2025 10:58:13 -0000 (UTC), piglet >> wrote: >> >>> john larkin wrote: >>>> On Tue, 8 Jul 2025 18:36:01 -0400, Phil Hobbs >>>> 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