Part Number: LMG1020
I need very fast capacitive load driver for 60MHz pulse ( duty: 50% ) with 1nF Capacitive Load and very low Rise/Fall/Propagation Delay.
I Think LMG1020 is the closest solution for fast driving.
However 5Vdd power supply is little higher value that I need.
My Ideal requirement Vout is 0 to 4V but I think it is too low to use lmg1020 driver.
Can I use LMG1020 with 4.5V supply? ( I know 4.75 V is minimum but TINA-TI simulation is OK with 4.5V dc supply)
If it is impossible I want to use simple mosfet inverter (buffer) to change voltage swing level with very fast response time
Could you recommend CMOS pair applicable 60MHz 4V pulse? or Other solutions for nanosecond pulse capacitive load driver?
Welcome to e2e!! Thanks for asking about LMG1020, Im an apps engineer and will help.
LMG1020 has a VDD recommended minimum of 4.75v. The device should function above UVLO turn on max of 4.33v.
Using VDD at 4.5v only leaves about 200mV headroom before the driver reaches UVLO condition in which the driver would be disabled. Regardless, let me look into the reliability at 4.5V and update you.
You can use a simple level shifter on the output, between the driver and the fet with a seperate 4V supply. You can also use higher gate votlage fet. Are you using a GAN fet?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Jeffrey Mueller:
Thanks for your kind help. Unfortunately, I can't use voltage divider. I think voltage divider with resistor may degrade 60MHz pulse transient and RMS current consumption with capacitive load. 1ns~2ns Rising Time with 1nF load is very important factor for me. For more detail, I need to charge and discharge the 1nF capacitor very fast pulse with almost perfect transient with precised timing. I want to use LMG1020 as a kind of digital buffer for capacitive load. ( Yeah, I need VERY high current 4V out Logic buffer. XD) A traditional level shifter IC is not applicable for this situation(1nF/4V/60MHz) due to It's low current supply ability. So as I mentioned first, I'm considering to use simple MOSFET buffer for level shift purpose. (1nF Load / 2ns rising time must be achieved) Discrete BJT Buffer may be a solution, then I think I don't need to use LMG1020 for logic buffer. ( I'm not good at discrete design and also I want to keep design as small as possible. This is my very last solution at this time) In conclusion, I think I should change my questions. Is there 4V~5V Logic Buffer for 1nF Load with 2ns Rising Time?
I will post my questions to logic forums.
In reply to Sangbeom Jeong:
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.