In my old 4-wheel robot setup, I had a 5V regulator built around an LF50CV low-voltage dropout 3-pin regulator. Unfortunately, with the added current drain of the Pi5 and OAKD-Lite Camera, the LF50CV started dropping the output voltage to the point where the Pi5 started to get flaky. In discussing this with Grok, he suggested The Pololu D24V50F5 step-down regulator shown below:

I did some initial testing on the module:

• At 9.1V at the ‘Switched Battery input, the Vbatt monitor voltage was 3.3V – the upper limit for inputs to a Teensy 4.1. Since 9.1 is well above even the high charging limit (~8.4V), this seems pretty safe.
• At a measured Irun = 0.2A, Irun_out measured 90mV
• At a measured Irun = 1.5A, Irun_out measured 0.4V
• at a measured run = 1.14A, Irun_out measured 0.255V

Then attached a USB Type C male pigtail to the regulator output and then plugged it directly into the Raspberry Pi5. The Pi5 booted right up and I was able to access it from my PC using VS Code. Regulator output voltage with Pi5 connected was 4.99V at a measured input current of about 0.55A.

Here’s a photo showing the current sense/regulator module already hot-glued to its 3D-printed mounting plate.