TPS7A57: Charge pump enable or not - Impact on noise

franziskus

Part Number: TPS7A57

Tool/software:

Hi,

my customer using TPS7A5701 in a new application. They would like to know if they should activate the internal charge pump or not.

What is the impact on switching noise?
Is the external bias needed 3V or higher?

Best regards

over 1 year ago

0 Stephen Ziel over 1 year ago

TI__Mastermind 37005 points

Hi Franziskus,

You can see the noise performance with and without the charge pump enabled by reviewing the datasheet plots in figures 6-14 through 6-32.

Please see section 7.3.5 in the datasheet for guidance on whether a BIAS rail is required for your design, or if you can use either the charge pump or BIAS rail. For lowest noise performance, use a BIAS rail that is at least 3V higher than Vout.

Thanks,

Stephen

0 franziskus over 1 year ago in reply to Stephen Ziel

TI__Expert 8249 points

Thanks Stephen!

Customer concern is to get best performance and least noise.
Their input voltage is 1.2V and the output voltage is 1V.

Any other advice?

Best regards

+1 Stephen Ziel over 1 year ago in reply to franziskus