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Current savings in CC254x using TPS62730

Posted: 29 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:DC-DC converter? RF?

The CC254x family of devices operates between 2.0V and 3.6V. Internally, the supply is generally regulated down to 1.8V using LDOs. This means that for systems with high supply voltages, much of the energy is lost in the LDOs. To remedy this, an external DC/DC can be used to regulate down to ~2V and increase the overall efficiency of the system. There are two main challenges that need to be addressed with this design:
- The quiescent current of DC/DC solutions dictate that they have to be powered down during the lowest power modes (PM2/3). It is a design challenge to have a microcontroller switch on and off its own power supply.
- The DC/DC introduces switching noise on the power supply. This may adversely affect RF performance and make it difficult to pass RF regulations.

The TPS62730 is a synchronous step down DC-DC converter optimized for low power wireless applications. The purpose of this design is to both make a test platform to enable us to characterize the solution while at the same time serving as a reference design and development platform for our customers. The goal of this design should be to make and characterize a solution that gives reduced peak and average current consumption in high supply voltage applications while maintaining good RF performance and passing regulations.

View the PDF document for more information.

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