Buck-boost regulator for single-cell Li-ion to 3.3V rail
This covers the full discharge curve of a single-cell Li-ion battery (3.0 V to 4.2 V) and also handles multi-cell alkaline or USB input without a mode-select pin. The 500 mA continuous output rating is the headline load current — confirm your downstream rail budget stays under this at the lowest input voltage, where the buck-boost duty cycle is highest.
Switching frequency and external component sizing
The 2.5 MHz switching frequency lets you use a 1 µH to 2.2 µH inductor and small 10 µF ceramic capacitors, keeping the total solution area under 15 mm². This is a deliberate trade-off: higher frequency means lower ripple but slightly higher switching losses — the datasheet efficiency curves show ~90% peak at 3.3 V output.
Sourcing and ordering the exact code
The base product number is TPS63051 — the full suffix 'RMWT' encodes the package and reel configuration. Confirm the BOM quantity and preferred packaging before committing; we source and quote to order against your line item.