WEBENCH® Tools/TLV61220: Recommended DCDC for low power battery device

Graeme Parker

Expert 1265 points

Part Number: TLV61220
Other Parts Discussed in Thread: TPS61021A, TPS61220, TPS61291, TPS610981, TPS610985

Tool/software: WEBENCH® Design Tools

I'm considering using TLV61220 or TPS61021A in a design powered using 2 x AA alkaline batteries.

When my device is operating it will take about 20mA. When idle it would be about 20uA.

Battery life should be about one year with the operating:idle ratio I'm using.

Would either of the above devices be recommended, or any others? I'm concerned that the quiescent current into the Vout pin (17uA) could double the idle power consumption of my device.

Thanks.

over 7 years ago

0 Jasper Li over 7 years ago

TI__Mastermind 46905 points

depend on if you need to shutdown the boost in idle mode. if yes, you can use TPS61021A or TPS61291, if not, you can use TPS61220 or TPS610981 ,

0 Graeme Parker over 7 years ago in reply to Jasper Li

Expert 1265 points

Hi. Thanks for the reply.

If I understand correctly, when in shutdown the device disconnects the output from the input. My application would still require 3V power when in IDLE.

Do I also understand correctly about the quiescent current, in that this is always present when the device is active? I think that this might still negate any benefit in using a DCDC to get more life out of the batteries.

0 Jasper Li over 7 years ago in reply to Graeme Parker

TI__Mastermind 46905 points

Then you can have a look at TPS610985 which consume less than 1uA during operation.

Power management

Power management forum

WEBENCH® Tools/TLV61220: Recommended DCDC for low power battery device