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TPS763: How to understand the differences between Electrical Characteristics Table and Typical Characteristics Graphs

Romain Gloo
Prodigy 70 points
Part Number: TPS763

Hello,

I was looking for the output voltage range of the TPS76325 (5V). There are tow sources in the datasheet (http://www.ti.com/lit/ds/symlink/tps763.pdf). The problem is that these sources do not agree on the output range...

The 1st one is from the Electrical Characteristics (below).

The first yellow line is specified at 25°C and the second is specified on the whole temperature range.

Conditions are:

  • VI = VO(typ) + 1 V ==> 5V +1 = 6V
  • IO = 1 mA  (current range is 1mA to 150mA)
  • EN = IN
  • CO = 4.7 µF

The second source is the graphs in the Typical Characteristics. There are two graphs that are supposed to give the output range (Figure 3 and Figure 6). 

Figure 3 is supposed to illustrate the range at 25°C. So, can we expect that is should match the range given is the Electrical Characteristics? The Typical value is given at 5V but the graph does not even cross 5V. It is always bellow 5V. So, wo shall we trust?

Figure 6 and Figure 3 agree about output voltage @25°C. But where do I find the 4.8V point (minimum voltage from Electrical Characteristics) and the 5.2V point (maximal voltage form Electrical Characteristics)?

So, the questions are:

  • Shall we believe the Electrical characteristics or the Graph? 
  • Why are there differences?

There is probably something that I don't understand in this datasheet. Any help appreciated.

Thank you!

Romain

  • 0
    TI__Guru 55940 points

    Hi Romain,

    The Electrical Characteristics table states the specifications for the device.  The Typical conditions are governed by the conditions listed at the top of the EC table; therefore, the statistically typical TPS76350 is 5 V at 1 mA.  Our test coverage ensures that we only ship devices that fall within the Min and Max limits for the stated test conditions; therefore, it is statistically unlikely that you would come across a unit at the Min or Max limit under the same test conditions.

    The Typical Characteristics curves are used to show typical characteristics for the device in a visual way.  Typically this is where we show how a given specification of the LDO typically drifts over temperature.  These curves are derived from actual measurements and represent the statistically typical device; however, the sample size is smaller than the sample size for the typical specification in the Electrical Characteristics table which is why there is sometimes a slight difference between the two.  As these curves represent the statistically typical device, you will not see any curve cross the Min or Max specification from the Electrical Characteristics table.

    In the case of the specification that you are looking at, both the Electrical Characteristics table typical specification and the Typical Characteristics curve line up at 5 V.

    Very Respectfully,

    Ryan