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TMAG5231: Maximum operating voltage: OK for x3 AA batteries?

Chris Dilliway
Prodigy 66 points
Part Number: TMAG5231

Hi,

We are planning the use this device as the primary power switch for a battery operated alarm.  On the basis the user decides to fit AA cells with lithium iron disulphide chemistry, we can expect the maximum input voltage to be 5.49V  (i.e. 3 * 1.83V).  The component data sheet indicates 5.5V max for both Recommended Operating Conditions and Absolute Maximum Ratings.   Whilst we are just about inside the recommended conditions, I am concerned about be so close to the absolute rating. 

Do you recommend using this product for x3 AA cells without a crowbar (or other overvoltage protection system)?

  • +1
    TI__Mastermind 21720 points

    Hello Chris,

    We only guarantee the device working and not being damaged up to 5.5V.  If you are concerned that your customer will install batteries that exceed 5.5V, I would recommend using some sort of overvoltage protection.  Perhaps you could just use a Schottky diode in series with the supply pin.  It would shave a little off the top with its low forward voltage.