TPS2001C: Help to specify operating current

David Daminelli

Part Number: TPS2001C
Other Parts Discussed in Thread: TPS2069C, TPS2065C

Hello,

I want to use the TPS2001C to switch the input voltage of the DCP010512DBP DC/DC converter. but i'm not sure if this is the correct choice.

After the transient, the maximum current sinked by the 5V is 0.2A, but the DCP010512DBP has a high inrush current (near 2A).

The DCP010512DBP datasheet says that if the input voltage drops bellow 4V, the device may not start properly. The TPS2001C says that when the current is above the Ios parameter, it drops the voltage near to 0 while the current is held to a certain limit. So, I understand that the right choice is that the Ios current to be the maximum as possible to garantee I dont have any problem with the DCP010512DBP startup.

Am I correct about this? Or am I misunderstanding the datasheet infos?

over 4 years ago

0 Ziv Zhang over 4 years ago

TI__Mastermind 18031 points

Correct, David.

To reduce the transient current. Please add bigger input and output capacitor of TPS2001C. For DCP010512DBP, it doesn't belong to our team. If any concern with this device, please re-submit a thread with the name of DCP010512DBP.

For TI's policy, I will first click resolved button.

If you have any other concern, contact me any time.

If you think resolved, please help click 'Issue is solved button'.

Thanks.

0 David Daminelli over 4 years ago in reply to Ziv Zhang

Prodigy 80 points

Thanks for the answer!

Is there a way to estimate how larger must the capacitors be?

0 Ziv Zhang over 4 years ago in reply to David Daminelli

TI__Mastermind 18031 points

For input: 10uF+0.1uF. For output above 10uF+0.1uF.

For TI's policy, I will first click resolved button.

If you have any other concern, contact me any time.

If you think resolved, please help click 'Issue is solved button'.

Thanks.

0 David Daminelli over 4 years ago in reply to Ziv Zhang

Prodigy 80 points

Ziv,

The digikey is out ofstock for the TPS2001C and TPS2069C (1.5A model). Could I use the 1A model (TPS2065C) in this situation i've described? If I shouldnt, is there any in stock substitute for this IC?

0 Ziv Zhang over 4 years ago in reply to David Daminelli

TI__Mastermind 18031 points

Yes, it's fine.

For stock, please ask the FAE who support you and contact our marketing engineer.

For TI's policy, I will first click resolved button.

If you have any other concern, contact me any time.

If you think resolved, please help click 'Issue is solved button'.

Thanks.

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TPS2001C: Help to specify operating current