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.
Part Number: TPS61099
Is there a recommended minimum bias current for the feedback network? I'm trying to minimize the bias current for R1 & R2
without compromising the device function. In the EVM, the bias current is Vout/(R1+R2)=5V/(1Mohm+0.25Mohm)=4uA.
My circuit Vout=2V so I was thinking of using R1=R2=1Mohm, which means the bias current is 1uA. Is this too low? Can I go lower?
It depends on how accuracy the Vout you expected. Do you have such requirement?
Below is an application note:Design considerations for a resistive feedback divider in a DC/DC converter. It may help you do the analysis
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 Minqiu Xie:
+/-5% accuracy is okay.
I didn't see a leakage spec for the feedback pin of TPS61099.
In reply to Kelvin Le THS:
The leakage current is 50nA max. And please search IFB_LKG in datasheet.It should be OK using R1=R2=1Mohm.
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.