Hi,
TPS61291DRVT in a project running on 2xAAA alkaline batteries.
When the battery gets low (~20%), we are not able to use the DCDC to "juice" the batteries, rather the DCDC fails, and the voltage drops, choking the system, either when the DCDC itself is turned on (from bypass to boost), or if already in boost, when a load such as a buzzer (~100mA average) is added. Under the same conditions, in bypass mode, the buzzer works (although obviusly with lower sound density).
Now, of course this behaviur might be expected, as under these conditions we are close to the max spec of the component. Our questions are:
1)what is the ideal in/out cap + inductor combination to get the best performance in this case? Is there a preferable type of capacitor, and especially inductor (eg. wirewound, layered power inductor etc) to maximize performance at these limits?
2)Are there any TI compomemts better suited for this usage?
3)Any tips for best usage of these components, or other battery juicing solutions.
Thanks!
