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TLV62568A: Buck Converter VIH Spec - Inquiry

Jason Seitz1
Prodigy 20 points
Part Number: TLV62568A
Other Parts Discussed in Thread: TLV62568

I had a quick question on the TLV62568ADRLR Buck Converter. I’m doing some bench testing and I’m noticing the device is enabling prior (i.e. lower voltage) to the High Level Input Voltage Enable Pin (VIH) as specified on the datasheet.

Even with VIN > 2.5V I’m seeing the device enable and begin to regulate at EN = 0.8V when per spec it shouldn’t turn on until 1.2V min?

 

 

I think this may have been resolved per following TLV62568 ticket. But the TLV62568A (notice 'A' suffix) doesn't have Typical spec listed. There is a disconnect between the two datasheets.

http://e2e.ti.com/support/power-management/f/196/t/588944?tisearch=e2e-sitesearch&keymatch=TLV62568%2525252520enable

 

  • 0
    TI__Mastermind 37091 points

    Hi Jason,

    As highlighted in the other thread, to ensure that the IC acknowledges a high-level signal on EN pin, it needs to be supplied by 1.2V. Although the typical VIH level is lower than 1.2V, it will not capture the production variation. Hence, the user should keep in mind to bias the EN pin with 1.2V (minimum) to enable the IC.

    Best regards,

    Excel  

  • 0
    TI__Intellectual 1525 points

    Hi,

    the 1.2V is not the minimum voltage the device requires to turn on, it is the minimum voltage at which the device is guaranteed to turn on. Usually, the actual threshold is lower than this value.

  • 0 in reply to Excel Regidor
    Prodigy 20 points

    Thanks Excel,

    Understood. But the way the limits are documented in the TLV62568A specification to me are misleading. For VIH = 1.2V listed as a Min where in fact the device will typically turn ON much lower ~0.8V. To further convolute in TLV6256 datasheet which i suspect is similar silicon or the same silicon just "binned" differently that part has the same spec documented differently (i.e. Min becomes Max and vice versa, Typical's are documented, etc.). 

    It seems that the it would benefit the engineering community if the TLV62568A spec was updated to include Typical's, or at least a Note explaining what typically happens.

  • 0 in reply to Jason Seitz1
    TI__Mastermind 37091 points

    Hi Jason,

    Thanks for your recommendation. And we will consider it in the next datasheet update.

    Best regards,

    Excel