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  • Author Author: mlease
  • Date Created: 15 Jun 2015 3:42 PM Date Created
  • Views 578 views
  • Likes 1 like
  • Comments 2 comments
  • leakage_current
  • power_packages
  • thermal_vias
  • heat_dissipation
  • thermal_design
  • low_power_design
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Keep it cool!

mlease
mlease
15 Jun 2015

Several of my recent posts have mentioned the very negative impact of heat on power consumption. This is the first of a two part series of posts on thermal management for low power devices. This information is mostly taken from my "Low Power Design" PDF e-book.


As semiconductor geometries have shrunk, in recent years leakage current has become a significant component of the overall power consumed by ICs. As parts heat up, their leakage current typically increases. It is not uncommon for parts to consume twice as much current at their highest rate temperature than at their lowest. For example, the AD8226 op-amp is rated for -40°C to 125°C. The quiescent current ranges from 325uA at -40°C to 425uA at 25°C to 600uA at 125°C. This is nearly a 100% increase across the temperature span and nearly a 50% increase from “room temperature” to the maximum temperature. You should conduct your current measurements at the temperature your product will normally operate at if not at the temperature extremes too.

 

Read the complete post at http://cmicrotek.com/wordpress_159256135/.

 

Download the "Low Power Design" PDF e-book at CMicrotek - Resources

 


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  • mlease
    mlease over 10 years ago in reply to DAB

    That sounds like some interesting research you are doing.

     

    As leakage currents become a greater percentage of a device's total current, the temperature aspect will become something more and more engineers will have to pay attention to. With wireless communications and energy harvesting power sources more and more electronics will end up in outdoors applications with widely varying temperature ranges and widely ranging current draws depending on location and time of year.

     

    Mike

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  • DAB
    DAB over 10 years ago

    Hi Mike,

     

    As I am working through my atomic model, I have found that even very low differences in voltage potential will  induce current flow across atoms.

    Differences in temperature also causes a low current flow from atom to atom.

     

    One thing I found was that some of the doping atoms actually set up current flow loops within the substrate, which can give you a kind of low energy gating effect.

     

    DAB

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