topic Re: PF8200 VIN vs SWXIN Voltage in Power Management

PF8200 VIN vs SWXIN Voltage

adevries — Thu, 22 Aug 2019 21:02:45 GMT

Hello,

For the PF8200, is it important to have the voltage on VIN match the voltage on the Switch and LDO inputs? (SW1IN-SW7IN and LDO12IN-LDO4IN). Or can VIN be run at 3.3V while the Switch and LDO inputs are at 5V?

Thanks

Re: PF8200 VIN vs SWXIN Voltage

nelson_scheja — Fri, 23 Aug 2019 06:15:05 GMT

I just created a thread about exactly this topic few days ago: Different inpult voltages lead to destruction???

So, despite the datasheet saying nothing about it, this is not allowed.

Re: PF8200 VIN vs SWXIN Voltage

guoweisun — Fri, 23 Aug 2019 07:44:37 GMT

Don't suggest your do that! Using VIN different from SW and LDO input.

Re: PF8200 VIN vs SWXIN Voltage

adevries — Fri, 23 Aug 2019 16:45:32 GMT

Oh wow, thank you for linking that thread. I'm really glad I asked this question. Thanks for the info!

Re: PF8200 VIN vs SWXIN Voltage

adevries — Tue, 17 Sep 2019 20:37:45 GMT

Hi G.W. Sun,

Thanks for the response. Would it be safe for me to have VIN at 5V, and SW and LDO inputs unpowered (at 0V)? Or will that also break the PF8200?