This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
We would like to use the TPS40303 with Vin tied to a 3.3V rail, can we power Vdd with a dedicated 5.0V supply (e.g. REG711)?
My intent is to increase the BP voltage from approx. 3.3V to 5.0V and thus obtain higher power efficiency (lower MOSFET RDSon).
[High side MOSFET is the IRF7821/ Low side is the IRF7832.]
I don't think you can have 5V Vdd and 3.3V Vin for this device. The high-side OC protection is based on the high-side Rds,on sensing, basically detecting the voltage difference of Vdd-SW, instead of Vin-SW.
What I can think of is connecting 5V supply to BOOT through a diode, so that at least the high-side gate drive voltage is high.
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 Na Kong:
This information really helps, as it means we must find another TI SMPS that supports separate PVIN / VIN rails. Our power source is super capacitor based, so we want to use as much of the available voltage range (3V-10V) as possible...
I really like the TPS56921. Any idea when it will be supported in WEBENCH?
In reply to Christopher George:
I would suggest you post your request of TPS56921 in a seperate thread. WEBENCH related question can be posted to WEBENCH forum:
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. 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.