Negative rail from a positive input — what the TPS63700DRCTG4 does
The Texas Instruments TPS63700DRCTG4 is a buck-boost regulator that generates a regulated negative output from a positive input supply.
360 mA output — sizing the load budget
The 360 mA output current rating sets the ceiling for the negative rail. For a typical -5 V rail feeding a handful of op-amps and a reference, 360 mA is generous; for a -12 V rail powering a small relay or a solenoid driver, check the inrush and steady-state draw against this limit. Switching at 1.38 MHz, the output ripple lands in a range where a small LC filter cleans it up without eating board area. No synchronous rectifier here — the external Schottky diode adds a couple of components but keeps the BOM cost down.
Package and footprint — 10-VSON with exposed pad
The 10-VSON package (3x3 mm) with an exposed thermal pad requires a PCB land pattern that connects the pad to a copper pour for heat sinking. The supplier device package is 10-VSON (3x3).
Not qualified for automotive under-hood (no AEC-Q100), but fine for cabin or bench gear.