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LMZ10500: Maximum total capacity output

Intellectual 1435 points

Replies: 3

Views: 328

Part Number: LMZ10500

Hi,

 

The LMZ10500 describes on page 14/15 of the datasheet the problem, that when the Cout is too high the output short circuit protection takes effect.

In table 1 on page 15 for 1.0V the maximum Cout is 33 µF and for 1.8V the maximum Cout 47µF

What about the various other capacitors and their loads which are also connected to this supply voltage in parallel within the circuitry?

The customer has eg. in their application a total capacity of 260µF at 1.8V and a total capacity of 180 µF at 1.0V.

Would you recommend this part for the customer’s use case?

 

Thanks

Fred

  • Hi Frederick,

    Table 1 of the datasheet specs the total effective capacitance on the output of the regulator. Since the customer application has a total capacitance greater than 33uF, this part will not work for the customer. There is an issue with start-up stability if there are too many output capacitance. 

    Can you tell me the VIN and IOUT requirement of your customer? Perhaps I might be able to find an alternative part to fit their needs.

    Regards,

    Jimmy 

  • Hi Fred,

    The TPS82084 or TPS82130 should work for you, if the LMZ10500 meets your power needs.

    This app describes the main concern with starting up into a high capacitance: www.ti.com/.../slyt669.pdf

    Chris Glaser

    Texas Instruments

    ________________________________

    TPSM82810 - new, 6Vin, 4A, high efficiency power module with clock synchronization Now sampling!

  • In reply to Chris Glaser:

    Thanks for the information and suggestions. The customer will try both parts TPS82084 and http://www.ti.com/product/TPS82150

    Fred

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