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TPS62263 series step-down converter interface with CC2541

Other Parts Discussed in Thread: CC2541, TPS62263, TPS62730, TPS62260

Hi,

  In our project we have replaced our dc-dc converter TPS62730 with TPS62263(Automotive grade,fixed voltage). TPS62263 has 2 pins MODE and EN. In the datasheet, these pins connected to GND and VCC respectively. My doubt is how can I interface these pins with MIcrocontroller (CC2541)? or Should I follow the datasheet application circuit?

Thanks

 Vipin.

  • Why did you change the DC/DC? I assume it is to get an auto qualified device?

    Before using any device, it is always a good idea to read its data sheet. So, you should read the rather short TPS62263 data sheet and understand what those two pins do.

    You need to tie EN to Vin to turn on the device. The MODE pin controls whether you have highest efficiency at light loads or lowest noise at these loads. The TPS62730 has been designed to properly power a radio with no issues. Tying MODE to Vin would provide the safest output signal, if you can tolerate the reduced efficiency.

    Whether to connect these pins to Vin directly or to the MCU is a system level decision you need to make. Assuming the MCU is powered from the output of this DC/DC, you should tie EN to Vin to turn it on and power the MCU.
  • Thanks for your quick reply.

    1. TPS62730 is not Automotive grade. TI suggested TPS62263 instead of TPS62730.
    2. If you ave any reference design with CC2541 please share me.
    3. What I am thinking is, connect MODE to GND and EN to I/O pin of CC2541,then I can Enable and Disable(shut-down) TPS62263.
  • I suggest that you test the TPS62260 EVM with the CC2541 to verify the performance is acceptable.

    How is the CC2541 powered? Is it from the output of the TPS62263? The TPS62263 does not have pass through like the TPS62730, so it would need to be always enabled in this case.
  • yes, CC2541 is powering through output of TPS62263 .