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TPS62056 - best efficient low current switcher?

Calum Mackinnon
Genius 4155 points
Other Parts Discussed in Thread: TPS62150, TPS62170, TPS62125

For my 3.3V power supply I am looking at the TI TPS62056DGS. My nominal power will be in the 200uA range, but when the device wakes up, the 3.3V current goes up to 300 to 400 mA. I need my supply to be as efficient as possible in the 200uA range. Any suggestions? Is the TPS62056DGS a good choice? Is there another switcher you would recommend. My input voltage range is 5.5V to 8V. I'm not sure yet of my off time compared to my full on time - roughly I will wake up every 7 seconds and do some measurements, these will ideally will take less than 0.5 seconds. Once every month I will do a download via bluetooth of roughly 1Mbyte - so powered on for approx 30 seconds for teh download.

I don't think an LDO will give me my efficiency so I'm looking foir a switcher.

Any good options?

  • 0
    TI__Guru*** 142750 points

    Please read the ground rules post at the top of this forum for tips on better post titles.

    I would not recommend using the older TPS6205x devices.  The newer TPS6215x/7x/2x are better fits with smaller solution size, better transient response, and higher efficiency.  I recommend the TPS62125 if you only need in the 300 mA range or the TPS62150 or TPS62170 for higher currents.  You can have a look at the efficiency curves in the datasheet and order the EVM to evaluate more.