6 MHz buck — why the switching frequency matters
The TPS62665YFFR is a fixed-output 1.2 V step-down (buck) converter from Texas Instruments, switching at 6 MHz. That switching frequency is the headline spec: it lets you use a 0.47 µH or 1 µH inductor and 4.7 µF output cap in 0402 or 0603 case sizes, collapsing the power-stage footprint to roughly the area of the DSBGA package itself. For space-constrained designs — wearables, IoT nodes, handheld instruments — this is the regulator that fits where a lower-frequency part would need twice the board real estate.
1 A continuous — load budget and thermal reality
Rated for 1 A continuous output. In a 6-DSBGA package with no exposed pad, the thermal path is through the solder bumps and the PCB copper.
Input range and output — what the BOM sees
Output is fixed at 1.2 V — no resistor divider, no feedback trim.
DSBGA layout — what the board needs
6-bump DSBGA, 0.5 mm pitch. The bumps are solder-mask-defined; the PCB pad diameter should be 0.25 mm with a 0.3 mm solder-mask opening. Route the input cap (4.7 µF, 0603) within 2 mm of the VIN bump, output cap similarly close to VOUT. The 6 MHz edge rate demands short loops — a 10 nF high-frequency bypass cap directly at the IC bumps is not optional. Stencil aperture for the bumps should be 0.28 mm square, 100 µm thick.
Lifecycle and ordering
No direct replacement or second-source alternate is listed by TI, but the TPS62665 family shares the same pinout and control loop, so other fixed-output voltage variants (0.8 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V) are drop-in compatible if the output voltage changes.