Two rails from one tiny package
The TPS610985DSET from Texas Instruments packs a synchronous boost converter and a linear LDO into a single 6-WSON package measuring 1.5x1.5 mm. The boost delivers 3 V at 350 mA on output 1, while the LDO provides a clean 3 V at 200 mA on output 2 — enough to power a small sensor node or Bluetooth module from a single-cell alkaline or Li-ion battery that sags to 0.7 V.
Input range and operating temperature
The input supply range spans 0.7 V to 4.5 V, so it can start up from a nearly dead primary cell or a fully charged Li-ion.