# Boost converter for powering SD card

I want to use a switching boost converter that has 3.3V output in order to power an SD card. Also, the input voltage is a CR2477 battery, with voltage ranging from 2 to 3 volts. I have seen that an SD card may require up to a maximum of 100mA during writes. As a result, I found this boost converter: TLV61225DCKR .

As you can see in the link above, the output current is said to be 400mA on the site. However, by checking the datasheet of the converter, I found out that 400mA is the switch current limit. Furthermore, from the datasheet, I saw this figure:

This figure was the only reference I could find for output current, and the problem is that the efficiency falls dramatically at around 100mA, where the axis ends. I do not understand why on the farnell site the output current is rated as 400mA. Is this an error of the farnell site? Also, could you explain what exactly is the switch current limit "Isw", as mentioned in the datasheet?

Lastly do you have any recommendations for such a boost converter? The important aspect is to be as efficient as possible during those 100mA peak current writes.

• "This figure was the only reference I could find for output current..." - What about Figure 1? – marcelm Apr 28 '20 at 20:46