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TPS62170-Q1: If load current is higher than 500mA, any risk?

Part Number: TPS62170-Q1
Other Parts Discussed in Thread: TPS62170,

HI Team,

My customer is using the TPS62170, but the current can be up to 600+mA sometimes. Is there any risk on this?

I check that datasheet mentioned 850mA is the current limit. However it also says this is a 500mA device.

How to understand this?

Thanks

  • Ted,

    The 0.85mA (minimum) current limit is the High Side FET current limit that limits the maximum current on a given switching cycle (eg. the peak inductor current limit).  Thus, if the sum of the DC load current plus 1/2 the inductor ripple current > 0.85mA, it will be possible to trip the internal current limit.  In turn, provided the input voltage is small enough and/or the inductor value is large enough to limit the peak inductor current below the 0.85mA (minimum) current limit threshold, you will be able to provide >500mA of current. 

    However, please be aware that increased load currents will also increase the total power dissipation of the TPS62170-Q1, and depending on the PCB thermal design and operating conditions (eg. elevated ambient temperature), it may be possible to trip the internal thermal shutdown protection.

    Sincerely,

    -Matt