22 µH, 250 mA — what the ratings mean for your rail
The Murata LQH32CH220K53L is a 22 µH unshielded wirewound inductor in the LQH32 series, rated for 250 mA continuous DC current. In a buck converter, 22 µH at 250 mA supports output currents up to that limit before the core saturates or the temperature rise exceeds the ferrite's margin — the 710 mOhm DCR will drop about 178 mV at full load, so factor that into the output voltage budget for a low-voltage rail.
Self-resonant frequency and layout note
The self-resonant frequency is 19 MHz — above that the inductor's impedance becomes capacitive, so keep switching noise below that ceiling. The unshielded construction means the magnetic field radiates; keep sensitive analog traces or high-impedance nodes at least a few millimeters away from the body.