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TPS7H4001-SP: Figure 6-1 Y axis Vref Tolerance

Mark Philip Felipe
Genius 9705 points
Part Number: TPS7H4001-SP

Hi Team, seeking clarification.

It is showing from bottom to top 604.5, 604.5, 604.6, 604.6, 604.6, 604.6, 604.7, 604.7, 604.7, and 604.8.  Seems to be discrete and not linear. e.g at VIN from 3.75V to 5.25V , the Internal VREF Initial Tolerance is at 604.6V, is this correct?

Thank you.

-Mark

  • 0
    TI__Genius 14540 points

    Hi Mark,

    Yes, the graph could be improved by providing more significant digits on the y-axis labels.  The intent is to show the variation of initial VREF across the PVIN.  This graph is created from one device taken from a larger population and does not necessary represent the mean value of the total population. 

    Below are the stats on the internal VREF for the TPS7H4001-SP showing mean and sigmas for a larger population across PVIN, temperature, and 1000 hour, +125C, lifetesting.

    Data Source

    # Samples

    Temperature (deg C)

    PVIN (V)

    VREF Average (mV)

    VREF Sigma (mV)

    Bench Char

    30

    25

    3

    605.620

    1.56385

    Bench Char

    30

    25

    5

    605.770

    1.59652

    Bench Char

    30

    25

    7

    605.920

    1.59194

    Bench Char

    30

    125

    3

    606.570

    1.48070

    Bench Char

    30

    125

    5

    606.770

    1.49088

    Bench Char

    30

    125

    7

    607.050

    1.48392

    Bench Char

    30

    -55

    3

    602.500

    1.68498

    Bench Char

    30

    -55

    5

    602.570

    1.65970

    Bench Char

    30

    -55

    7

    602.710

    1.63354

    Lifetest_0hr

    50

    25

    3

    606.410

    1.32987

    Lifetest_0hr

    50

    25

    5

    606.630

    1.27985

    Lifetest_1000hr

    50

    25

    3

    606.302

    1.30978

    Lifetest_1000hr

    50

    25

    5

    606.546

    1.28765

     Thanks

    Christian

  • 0 in reply to Christian Yots
    TI__Genius 9705 points

    Hi Christian, 

    Do we have trend data for the samples? For further analysis. 

    Thank you very much.

    -Mark

  • 0 in reply to Mark Philip Felipe
    TI__Genius 14540 points

    Hi Mark,

    The only additional data we have is the stats on the calculated drift by device for lifetest, HDR, and LDR.  Please see data below.

    Data Source # Samples PVIN (V) Temperature (deg C) VREF Average (mV) VREF Sigma (mV)
    Bench Char 30 3 25 605.620 1.564
    Bench Char 30 3 125 606.570 1.481
    Bench Char 30 3 -55 602.500 1.685
    Lifetest_0hr 48 3 25 606.414 1.353
    Lifetest_1000hr 48 3 25 606.302 1.323
    Lifetest_Drift 48 3 25 -0.112 0.255
    LDR_0krad 23 3 25 605.863 1.627
    LDR_100krad 23 3 25 604.260 1.658
    LDR_Drift 23 3 25 -1.603 0.248
    HDR_0krad 22 3 25 605.839 2.010
    HDR_100krad 22 3 25 604.552 2.055
    HDR_Drift 22 3 25 -1.286 0.326
    Bench Char 30 5 25 605.770 1.597
    Bench Char 30 5 125 606.770 1.491
    Bench Char 30 5 -55 602.570 1.660
    Lifetest_0hr 48 5 25 606.625 1.294
    Lifetest_1000hr 48 5 25 606.546 1.299
    Lifetest_Drift 48 5 25 -0.079 0.246
    LDR_0krad 23 5 25 606.074 1.593
    LDR_100krad 23 5 25 604.459 1.588
    LDR_Drift 23 5 25 -1.615 0.192
    HDR_0krad 22 5 25 606.100 1.987
    HDR_100krad 22 5 25 604.701 2.003
    HDR_Drift 22 5 25 -1.398 0.334
    Bench Char 30 7 25 605.920 1.592
    Bench Char 30 7 125 607.050 1.484
    Bench Char 30 7 -55 602.710 1.634

    Thanks

    Christian