Other Parts Discussed in Thread: LV2862,
Hi there,
We need an IBB solution that can go from +13-14V to -12V. The current requirements are ≈50-100mA (or less). My understanding was that most "typical" buck controllers could be used, provided voltage/current/etc. limitations are heeded.
I have a couple of preferences on which controller we use for logistical reasons, but the information here on e2e and Webench have caused some second-guessing.
LV2862Y
From a previous design, we have a canned application circuit for an LV2862 that was used in a traditional buck architecture. We could easily adapt that and drop it in. I'd planned on that until I read a TI'er's response to another gentleman on the e2e forum that the LV2862Y couldn't be used in the IBB configuration. See: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1227915/lv2862-negative-voltage-output
LMR36015A
We are also already using the LMR36015 in a buck configuration in the same design, so for BOM consolidation and ease of re-use, we could use this component for the IBB, but in Webench I noticed that a similar device LMR36015A was able to used in IBB (Hooray!). ... But the tool also indicated that the output voltage must be no greater than -5VDC (Boo!). I'm not sure if that's a function of the tool not being fully equipped or an issue with that particular component. If it is an issue with that particular component, does it also mean that the LMR36015 (sans "A") is also unable to be used in that configuration? If so, why?
Thanks in advance for any insight!
