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TPS63002: What happens when incoming voltages go over the 5.5v maximum?

jedie
Prodigy 80 points
Other Parts Discussed in Thread: TPS63002, TPS63060, TPS63061

Concerning the TPS63002, the maximum input voltage is listed as 5.5v, with an "absolute maximum voltage" rating of 7v.

My input voltage will usually be less than 5.5v but, rarely, it could go up to, and stay at, 5.75v (or even 6v) at up to 1.2 amps, for an hour or more.

My question is, what happens when incoming voltages are over the 5.5v maximum?  Does it still reduce 5.5v down to 5v... and then start adding any additional voltage over the 5.5v limit? In other words: 5.75v would become (5.5v-->reduced down to-->5v + .25v =) 5.25v.  6.0v would become (5.5v-->reduced down to-->5v + .5v =) 5.5v, etc.  Or does the TPS63002 continue to reduce the voltage down to 5v, but with increased heat production, or decreased precision/tolerance?

Also, what is the precision/tolerance of the 5v output?   +/-.05v?    I could not find this in the specs.

Thanks

  • 0
    TI__Genius 17240 points

    Though the device will regulate the output to 5V, operating outside of the recommended operating conditions may affect the reliability of the device. 

    Have you considered the TPS63061? It has a wide VIN range and can supply 1.2A at 5V out over most VIN as visible in figure 2 of the datasheet and calculated through the design equations. If you decide to use this part, please model your schematic and layout after the TPS63060 EVM.

  • 0 in reply to Daniel Acevedo
    Prodigy 80 points

    Thanks very much for your answer, Daniel.

    What is the precision/tolerance of the 5v output for the 63002 and 63061?  How close does it stay to exactly 5v?   +/-.05v?    I could not find this in the specs.

    Thanks