Quick AnswerAI GPU VRM inductors must handle MHz switching, 60-100A+ per phase, tight board space and high ambient temperatures. FeNi powder cores (Bs ≥1.5T, 1-100 MHz, 0.047-6.8µH) provide stable DC bias and low core loss in small footprints, which is why they power H100 and B200-class accelerators. Specify frequency, peak current, ripple and thermal budget, then validate with samples at the real operating point.
AI accelerators like NVIDIA H100 and B200 draw hundreds of amps across tightly packed voltage regulator modules (VRMs). The inductors in those VRMs have to switch at 1MHz or higher, carry tens of amps per phase, and stay cool in a 24/7 datacenter environment. Here is what to evaluate when selecting them.
Higher frequency shrinks inductor size and capacitor count, but raises AC core loss. At 1–100MHz, the core material — not the copper — usually dominates losses. FeNi powder cores hold core loss ≤300kW/m³ at 100kHz and remain usable well into the MHz range, which is why they appear in MHz metal inductors for GPU VRMs.
GPU phases can see 60–100A or more. An inductor with Bs below the operating flux saturates, inductance collapses, and ripple spikes. FeNi cores with Bs ≥1.5T and a distributed air gap keep inductance stable under heavy bias, preserving efficiency at full load.
The ripple current is a small percentage of DC but switches at the full PWM frequency. Low-loss powder cores reduce temperature rise and let designers use smaller parts. Ask suppliers for core loss curves at your exact frequency and ripple ratio rather than a single datasheet number.
VRM space is measured in millimeters. Inductor height, footprint and hot-spot temperature all matter. 30% volume reduction versus ferrite is typical with FeNi, which directly translates to denser GPU boards and better airflow.
YUTE Magnetics supplies MHz metal inductors (1–100MHz, 0.047–6.8µH) used in AI GPU and server POL designs. Send your VRM specification for a free engineering review within 24 hours.
For YTFN and YTMF series specifications used in these designs, see the High Flux Cores Guide.
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