LMZ31704: LMZ31704

VYDHA REKHAA

Part Number: LMZ31704
Other Parts Discussed in Thread: UCD90120

Hi, In one of our project we are using LMZ31704 power module (same as ZC706 design). Below design 30th Pin mentioned ALWAYS ENABLED. Is this module requires enable pin for Enable the power module (LMZ31704)?

over 3 years ago

0 Anthony F over 3 years ago

TI__Mastermind 35115 points

Hi Vydha,

The INH pin has an internal pull-up current of 1.15 µA. This means if the pin is left floating, the device will be enabled by default. However, this pull-up current is somewhat weak and you would need to make sure to not load the pin with more then 1-MΩ of resistance. If this pin is loaded too much, the internal pull-up current would not be enough to pull the INH pin above its 1.3-V minimum voltage required to turn it on.

Let me know if you have any further question.

Anthony

0 Anthony F over 3 years ago in reply to Anthony F

TI__Mastermind 35115 points

Hi VYDHA REKHAA,

I see you rejected this as being resolved. Could you let me know what additional questions you have?

0 VYDHA REKHAA over 3 years ago in reply to Anthony F

Prodigy 50 points

Hi Anthony,

Sorry for late reply,

Thank you for your response.

So shall I connect Enable signal from Power sequencer(UCD90120) of GPIO (3.3V)?

Regards,

Rekha.

0 Anthony F over 3 years ago in reply to VYDHA REKHAA

TI__Mastermind 35115 points

Hi Rekha,

Yes, I would recommend that if it's an option in your application. You can also use a resistor divider to VIN to ensure enough current to pull-up the pin. Whichever is easiest.

Power management

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LMZ31704: LMZ31704