TPS7B63-Q1: The soft start time of TPS7B63-Q1 / TPS7A66-Q1

takahiko yokota

Mastermind 7135 points

Part Number: TPS7B63-Q1
Other Parts Discussed in Thread: TPS7A66-Q1, TPS7A69-Q1

I have question about TPS7B6333-Q1 and TPSA6650H-Q1.

Are there these device the soft start function?

If they have the soft start function, could you tell me that value or calculating method?

Best regards,

Yokota

over 7 years ago

0 Ryan Eslinger over 7 years ago

TI__Guru 55940 points

Hi Yokota-san,

TPS7B63-Q1 does not have a soft-start function.

TPS7A66-Q1 has a small internal soft-start that is not adjustable and can be estimated by the power up scope shot (Figure 25).

Does your application require soft-start functionality to limit the inrush current or in an attempt to sequence the power rails?

Very Respectfully,
Ryan

0 takahiko yokota over 7 years ago in reply to Ryan Eslinger

Mastermind 7135 points

Hi Ryan-san

Thank you for the reply.

My customer's aplication need to design sequence the power rails.

Best regards,

Yokota

0 Ryan Eslinger over 7 years ago in reply to takahiko yokota

TI__Guru 55940 points

Hi Yokota-san,

For sequencing purposes have you considered driving the EN pin of the LDO with a SVS device (ti.com/svs)? This provides a robust method to enable the LDO after the monitored rail reaches a certain value. TPS7A69-Q1 even has a voltage detector integrated in the LDO.

Very Respectfully,
Ryan

0 Ryan Eslinger over 7 years ago in reply to Ryan Eslinger

TI__Guru 55940 points

Hi Yokota-san,

Since I have not heard back from you, I am assuming that you were able to resolve your issue. If not, please post a reply below (or create a now thread if this thread has locked due to time out).

Very Respectfully,
Ryan

0 takahiko yokota over 7 years ago in reply to Ryan Eslinger

Mastermind 7135 points

Hi Ryan-san

I'm so sorry for the delayed reply.

My customer will design the delay circuit of EN using capacitor.

Best regards,

Yokota

Power management

Power management forum

TPS7B63-Q1: The soft start time of TPS7B63-Q1 / TPS7A66-Q1