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LM63625-Q1: EMC Difference between LM63615 and LM63625

Part Number: LM63625-Q1

Hello,

We have a customer with his concern as attached. They are having different EMC behavior with two devices LM63615 and LM63625, though datasheet tells that they just differ in rated current.

Difference EMC Behaviour LM63615.pdf

  • Roland,

    The current rating difference comes with different ratings for current limits and IPEAK_MIN. See the datasheet on page 8 (see table below).

    In AUTO/PFM/Light load mode, the device ramps the inductor current up to IPEAK_MIN, then down to 0A, then waits some time before switching again. The difference in IPEAK_MIN results in more energy being delivered per switch for the 2.5A version which results in a lower switching frequency for the same conditions in AUTO mode.

    -Sam