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TPS62125: pulse overcurrent will harm device ?

Part Number: TPS62125
Other Parts Discussed in Thread: TPS62160, TPS62821, TPS62802

I would like to know if the TPS62125 can handle pulse current over it's steady operating limit.

 

The worse case scenario is 25ms at 500mA at 3.3v.  This event will occur at most every 8 seconds, but typically does not happen.

 

The device is normally operating the <300mA limit. The device’s input is 5V  - 3.3 V.

 

The device presently operates fine, but would it fail in the future or this 25ms  short pulse of 500mA is acceptable .

 

Thanks

  • Hi Joe,

    The device's current limit will limit the output current to safe value. This app note explains how this works (for a different device) in section 4: www.ti.com/.../slva543.pdf

    25 msec is DC to the device, so it will enter current limit if the current limit threshold is reached. In current limit, Vout will drop.

    The TPS62160/70 are pin to pin devices rated for higher currents.

    If you have a 5Vin to 3.3V converter, a lower Vin device like TPS62821 is more efficient and smaller. Smallest is the TPS62802.