TPS706: Supercap management an decoupling

Antonio Faggio

Part Number: TPS706

Hi,

I am using TPS70633DBV.

Now the customer asks to add a 0.5F supercap to the power supply of the board which will be located between the load and the regulator.

From the component datasheet I read it is indicated not to use more than 47 uF at the output.

How do you recommend resolving this? Is there a way to decouple the regulator from the super cap?
Is there any other more suitable component that you advise us to use?

A trivial method could be putting a resistor in series between the Vout of the regulator and the supercap. What is the minimum value that can guarantee effective decoupling?

Thank you for any suggestions.

Antonio

over 4 years ago

0 Stephen Ziel over 4 years ago

TI__Mastermind 33915 points

Hi Antonio,

We can help with this review.

What is the manufacturing part number of the 0.5F super capacitor? Can you send me the schematic of the LDO with associated load circuitry?

If we need to decouple the super capacitor from the LDO, the resistor idea is one option. But the super capacitor may have enough internal impedance that it is already well decoupled, we need the manufacturing part number to know for certain.

Thanks,

- Stephen

0 Stephen Ziel over 4 years ago in reply to Stephen Ziel

TI__Mastermind 33915 points

Hi Antonio,

What is the load current in the customers application?

Thanks,

- Stephen

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TPS706: Supercap management an decoupling