2.2 µH shielded power inductor for automotive DC-DC stages
The Murata LQH2HPZ2R2MGRL is a 2.2 µH shielded wirewound inductor in the LQH2 series, rated for 1.47 A continuous current with a saturation current floor of 1.55 A. The 160.8 mΩ max DCR keeps I²R losses manageable in a 1008 (2520 Metric) footprint that sits 1.00 mm off the board.
Current rating and saturation — the two numbers that matter
The 1.47 A rated current is the DC bias at which the inductance drops by a defined amount (typically 10-20% for this core material), while the 1.55 A saturation current is the hard limit where the ferrite core saturates and the inductance collapses. In a buck converter, the peak inductor current — DC load plus ripple — must stay below the lower of these two figures to keep the output in regulation. The 160.8 mΩ DCR at 1.47 A produces about 350 mW of I²R loss. The self-resonant frequency of 80 MHz is well above the switching frequencies of most automotive DC-DC converters (typically 400 kHz to 2.2 MHz), so the part behaves as an inductor rather than a capacitor in the intended band.
Shielded construction and board-layout fit
The shielded ferrite drum core contains the magnetic flux within the package, reducing radiated EMI to nearby traces and components. In a tight automotive ECU layout, this means the inductor can sit close to the switching FET and output capacitor without coupling noise into the analog sensor supply or CAN transceiver lines. The ±20% tolerance on the 2.2 µH value is typical for power-grade ferrite inductors; the actual inductance at the DC bias current will be at the low end of the band, so the converter's compensation network should be designed for 1.76 µH minimum.