Single-cell to 3V rail — the primary use case
The TPS61005DGSR is a fixed-output boost regulator from Texas Instruments that takes an input as low as 0.8V and delivers a regulated 3V rail.
1.3A switch current — sizing the power stage
For a typical 3V output from a 1.2V input, that translates to roughly 400–500 mA output current before the switch current limit is hit — enough for a small MCU plus a few peripherals. The 500 kHz switching frequency keeps the inductor in the 4.7 µH to 10 µH range, which fits the 10-VSSOP footprint without requiring a tall, high-current coil.
No last-time-buy or obsolescence planning is required for new designs using this part.
This covers industrial and commercial environments — portable gear, outdoor telecom enclosures, and factory-floor sensors — but not extended-temperature automotive or downhole applications.