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Use boost/buck converter directly for CC3200 power?

Prodigy 170 points

Replies: 1

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Hi all

I'm designing a custom board that uses a CC3200 module. Power supply range will be outside the 2.3-3.6V range of the CC3200. I'll need to use a separate boost converter (and for a different product a buck down from up to 25V). I see from earlier discussions on LDO selection (such as http://e2e.ti.com/support/wireless_connectivity/f/968/t/404463) that PSRR is an important factor for the CC3200. Is it therefore best to use a boost converter to get 5V, then use the recommended low-noise high-PSRR TPS79601 LDO to provide the 3.3V? This will obviously be less efficient that going straight to 3.3V from the boost - but would it be better that way? If so I'd do the same with the buck - go down to 5V then same LDO to 3.3V.

For boost to 5V I'm thinking TPS61032 and buck TPS5402 (I assume I can't get away with the 500mA TPS62175, given CC3200 peak calibration current of 450mA and rest of circuit will draw ~200mA, even though outside of brief 24ms calibration should be < 500mA?).

Many thanks

Matt

  • Hi Matt,

    CC3200 can tolerate a supply ripple of as high as 300mV. Most switching regulators also provide supply with noise levels within this amplitude. I don't see an obvious issue with directly going to 3.3V as long as the regulator can comfortably support the current requirements , as you have mentioned above. This would save you on cost as well as improve the efficiency.

    Regards,

    Dham

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