MCT8316A: Using External 3.3V Supply Instead of Internal Buck Converter

Nathan Belvedere

Part Number: MCT8316A

Tool/software:

Hi there,

We are using the MCT8316A in our design but do not intend on using the internal buck converter.

Regarding the application note SLAA643, I can see that it is possible to provide an external voltage source to FB_BK and omit the capacitor and resistor/inductor for the buck converter.

My question is, do I need to configure any registers prior to powering on the device? or can I simply apply 3V3 and then change the appropriate registers to disable the buck converter and proceed as normal?

Regards,

Nathan

4 months ago

0 Venkatadri Shantaram84961 4 months ago

TI__Mastermind 23442 points

Hi Nathan,

We are on holiday this Friday, we will aim to respond by Monday.

Buck will be enabled during boot time and after booting application change the value as required.

Thanks and Best Regards

Venkatadri S

+1 Venkatadri Shantaram84961 4 months ago in reply to Venkatadri Shantaram84961

TI__Mastermind 23442 points

Hi Nathan,

Sorry this message missed timely reply from my side.

You need to disable the BUCK in the gate drive register, but make sure VM is first applied before applying power to FB_BK.

Also, make sure FB_BK should not exceed 6V,

Thanks and Best Regards

Venkatadri S

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MCT8316A: Using External 3.3V Supply Instead of Internal Buck Converter