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TPS65070 - power dissipation limits

Boris Ruvinsky
Expert 1410 points
Other Parts Discussed in Thread: OMAP-L138, TPS65070

Dear E2E Forum:

I use OMAP-L138 and plan to use "Single Chip Power Solution" - TPS65070 to provide power to OMAP-L138 in the correct sequencing.

The data sheet (SLVS950B) of 12/2009 has on page2  "Dissipation Rating" table.

At 85'C the Power rating is 1.0W.

Our avionics product must be design for the temperature range -40'C +85'C.

Is this de-rating for the package only?

Or it is a maximum provided output Power?

How much power can be provided on the output dc-dc converters?

I need to have 1.2V, 1.8V, 3.3V - these are three dc-dc converters.

The current on 1.2V core will be ~600mA in our configuration.

The current on 1.8V total including external devices is ~200mA.

The current on 3.3V total is ~ 150mA.

The LDO 1.2 V for the PLL[0:1] will also be used.

LDO_1.2 for PLLs is ~90mA.

With 5V of input voltage - LDO_1.2V will consume ~0.45W.

Will all the above required power be available from TPS65070 at +85'C?

 

Thank you for your help,

 

Boris Ruvinsky

802-877-4978

  • 0
    TI__Genius 17240 points

     

    Boris,

    Your question is less related to the TPS65070 IC and more related to your system's thermal performance for which you should visit ti.com/thermal to understand. 

    The Dissipation Ratings table in the TPS65070 datasheet is power dissipated (Pd=Pin-Pout) and not just output power; this table also makes a number of system level assumptions which may or may not conform with your design. 

    The TPS65070 can supply the 1.7W of output power as you have specified as long as the junction temperature is below the absolute max of 125 C:

     

    Boris Ruvinsky said:
    The current on 1.2V core will be ~600mA in our configuration.
    The current on 1.8V total including external devices is ~200mA.
    The current on 3.3V total is ~ 150mA.
    The LDO 1.2 V for the PLL[0:1] will also be used.
    LDO_1.2 for PLLs is ~90mA

     

     

     

  • 0 in reply to Daniel Acevedo
    Expert 1410 points

    Thak you, Daniel.

    Boris