Providing the energy of things to the internet of things

Providing the ‘energy of things’ to the ‘internet of things’ is difficult. With so many things around your home or office or car, no one power source can be used for each of them.

TI graph

Some can be plugged into the wall, others need to run off of batteries, and still others are not suitable for either of those power sources—these should harvest energy from the surrounding environment’s sunshine, wind, or vibrations.

TPS62740 applicationBut with all of these different power types comes one overarching need—efficiency.

With so many things to connect together, very little power should be consumed by them. And what is consumed shouldn’t be wasted and given off as heat. The low and efficient power consumption of these devices is what unites them together.

A primary measure of the low power efficiency of a power supply is its quiescent current (Iq).

While the Iq of a device is not the full story of the current consumed for a low power system (as I explain here), it is an easy way to compare the low power performance of different power supply devices.

TPS62740 circuitAnd when one particular device has an Iq that is roughly one-hundred times less than similar devices, it’s probably worth looking at how this affects the low power efficiency in more detail.

Texas Instruments’ DCS-Control power save mode topology has been leading the low power revolution for many years.

Higher power DCS-Control devices, such as the TPS62130 and TPS62085, are needed to power the gateways/routers and servers. These devices can supply the higher power needed as well as achieve very high efficiencies at reasonably low output powers.

Chris Glaser, Applications Engineer at Texas Instruments





















To power the very small and very low power nodes in the Internet of Things, even higher efficiency is needed. When paired with ultra-low power circuits in the latest devices, DCS-Control results in an unbelievably efficient combination. For instance, on the figure above, the far left point on the x-axis denotes 1 µA of load current, where the new ultra-low power TPS62740 provides 60% efficiency. And if the leakage currents or hibernate mode current consumption of your system draw just 10-µA, then 90% efficiency is achieved. For the nodes in your system, the TPS62740 is sure to make the most efficient use of this energy to power your Thing to enable the Internet of Things in your life.


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