Boost converter for single-cell battery rails
The internal switch is rated for 200 mA, which sets the practical output current ceiling — at 3.3V out from a 1.2V input, expect around 60-70 mA continuous before the switch limit is reached, depending on efficiency.
The 0.7V minimum input lets the converter start up and regulate from a nearly depleted single cell, while the 5.5V maximum input means it can also run from a 2S alkaline stack or a USB 5V rail without an upstream LDO. Because the output is fixed at 3.3V, there is no external feedback divider — the BOM saves two resistors and one feedback-node capacitor compared to an adjustable-output boost.
Housed in a 6-lead SC-70 (SOT-363) package, it occupies about 2.1 mm × 2.0 mm of board area — small enough for space-constrained wearable and portable designs.