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TPS7A4501-SP: Differences between 402 & 403 and general questions

Zeev Leshem
Prodigy 90 points
Part Number: TPS7A4501-SP
Other Parts Discussed in Thread: TPS7H3301-SP

Hello,

I would like to better understand the difference between TPS7A4501-SP 402 (5962-1222402VHA) and 403 (5962R1222403VXC)

From the datasheet sheet I see:

5962-1222402VHA: 

– Wide Vin 2.3 to 20 V

– Output Current: 750 mA 

5962R1222403VXC: 

– Wide Vin 2.9 to 20 V 
– Output Current: 1.5 A
– Thermally-Enhanced HKU Package.
– Radiation Hardness Assurance (RHA) up to Total Ionizing Dose (TID) 100 krad (Si)

– Exhibits Low Dose Rate Sensitivity But Remains Within the Pre-Radiation Electrical Limits at 100 krad Total Dose Level, as Allowed by MIL-STD-883, TM1019 


1) I didn't see 402 mentioned at Radiation test report (only 403),  but I assume that 402 have Low Dose Rate sensitivity as well (as have same die, although it doesn't explicitly mentioned at datasheet). Am I right?

2) As I understand, 402 & 403 both have same die, so can 402 works up to 1.5A, same as 403? (The difference is it will not go thru RLAT as 403)

3) Does TPS7A4501 LDO recommended for DDR applications (assuming the worst efficiency vs. DC/DC buck converter is accepted)?

4) Can TPS7A4501 transient response track fast current changes of DDR?

5) What is the frequency spectrum of output impedance of the TPS7A4501 LDO?

Thanks,

Zeev. 

  • 0
    TI__Genius 11950 points

    Hi Zeev,

     

    I will need to look further into a few of your questions, but here is some information I can provide:

     

    1. The 5962-1222402VHA is not RHA so it is not mentioned in the radiation test report (indicated by the “-“ in the part number). The 5962R1222403VXC is RHA up to 100krad (indicated by the “R” in the part number). This resource may interest you if you would like more information on what the different sections of the part numbers mean.
    2. Yes, the 02 and 03 devices use the same die but have different lot acceptance levels. The 02 device is only guaranteed up to 750 mA. If you would like to see the full electrical differences between the two, the electrical characteristics for each are specified separately in the datasheet (Section 7.5 for the 02 device and section 7.6 for the 03 device).
    3. Depending on your requirements, the TPS7H3301-SP may be of interest to you if you are looking for a device specifically for DDR applications.

     

    Hopefully this clears up a few of your questions. I will need to look into the remaining ones and get back to you.

     

    Thank you,

    Sarah

  • 0 in reply to Sarah Koch
    TI__Guru 62930 points

    I would like to add one additional comment on the differences.

    The 5962R1222403VXC device uses the HKU package that is thermally enhanced.

    The 5962-1222402VHA device uses a U package that does not have thermal pads or vias.    This is a large part of the specifications differences between the two variants (other than group E lot accepts).   It is not rated to 1.5A primarily due to thermal/packaging reasons.

    For questions 4 and 5, I would suggest as Sarah did  that the TPS7H3301 be considered for DDR termination.   It is a push/pull design that can terminate to VDDQSNS/2 using internal divider with up to +/-3A of current.

    I do not have any data on the output impedance spectrum for the TPS7A4501.

    If this answers your question, please click "This Resolved My Issue"
    Regards,
    Wade