MP1605 vs MP2141

DC-DC Power Converters
1

Hi,
a few questions on MP1605 and MP2141 synchronous step-down converters. Their specs seem nearly identical, with MP1605 curves simply extended beyond the 1A limit of the MP2141.

  • are they the same silicon, with the 1605 simply a binned / tested batch ?
  • the 2141 has a better continuous power dissipation spec (1.5W instead of 1W), but only because it’s tested on the EV2141N-TF-00A evaluation kit with probably more copper pours than the standard JESD51-7 ? The difference is quite surprising.
  • In the 2141 thermal resistance specs, theta-Junction-to-case is listed as 50 C/W on that EV2141 eval kit, but 60 C/W on the JESD board. Can you explain why the junction-to-case resistance would change by simply using a different layout ? I always understood the theta-JC spec to be layout-independant…

Thanks for clarifying,
Chris

2

Hey Chris,

The MP2141N was derived from the MP1605, but can be configured to have a fixed output voltage and PG pin.
Yes, I believe the MP2141 has a better continuous power dissipation due to its improved thermal resistance in the EVB
Junction to Case temperature depends on the junction and the case, since the EVB provides a better junction temp, the junction to case spec is better. For more info on thermal rating, we recommend looking at our article : Understanding Datasheet Thermal Parameters and IC Junction Temperatures | Article | MPS (monolithicpower.com)
There is also a webinar in our youtube channel: Webinar: Understanding Datasheet Thermal Parameters and IC Junction Temperatures - YouTube

Hope this is helpful!

Regards,
Jonathan

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