Welcome to the Non-Isolated DC/DC Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".
Q: TPS62290 feedback divider R1 and R2 by 687520
In order to set Vout = 1.5V the datasheet recommends to use R2=180k and R1=270k. Is it possible to use R2=120k and R1=180k?
Are there any disadvantages, except higher current thru the divider, to expect?
A: TPS62290 feedback divider R1 and R2 by 1090425
This is ok but will give slightly lower efficiency at very very light loads where the divider current becomes a significant portion of the load current. I would recommend optimizing the Cff per this app note: http://www.ti.com/lit/an/slva289/slva289.pdf You can start with a 33 or 47 pF.
There is also the newer TPS62060 which might give a smaller solution size and better high load efficiency.
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.