Coilcraft has introduced a new family of Trans‑Inductor Voltage Regulator (TLVR) power inductors optimized for modern multi‑phase voltage regulator modules (VRMs) and point‑of‑load (PoL) converters.
These power inductor devices are aimed at high‑current rails in next‑generation CPUs, GPUs, ASICs and SoCs, where very fast transient response and high power density are critical.
Key features and benefits
The TLVR inductors are designed specifically for multi‑phase VRM and PoL topologies where several phases operate in parallel to supply low‑voltage, high‑current loads. In such architectures, inductor performance directly impacts transient response, efficiency and board area.
Key characteristics highlighted by Coilcraft include:
- Designed for VRMs and PoL converters using the latest multi‑phase topologies
- Low DC resistance (DCR) to reduce conduction losses and improve efficiency, especially at high currents
- Tight magnetic coupling, which supports TLVR operation and helps improve transient response in multi‑phase designs
- Excellent thermal performance, important for maintaining inductance and reliability at elevated temperatures and high currents
- Compact footprints enabling high power density around the processor or controller
- Specific SLV series options with high saturation currents up to 120 A and 152 A, supporting demanding core and memory rails
For power designers, low DCR and high saturation current mean that the inductor can carry the required ripple and transient currents with manageable temperature rise and without significant loss of inductance. Tight coupling within the TLVR structure is particularly useful in high‑speed digital systems where rapid load steps are common.
Typical applications
The TLVR power inductors are intended for power stages serving advanced digital ICs where supply stability and transient performance are critical. Typical target applications include:
- Core and auxiliary rails for next‑generation CPUs and server‑class processors
- High‑current power rails for GPUs used in AI accelerators, graphics, and data center workloads
- Power delivery for custom ASICs and SoCs in networking, storage, and communication equipment
- Server and data center VRMs, especially in space‑constrained motherboard and accelerator card designs
- Other high‑current point‑of‑load converters in computing and industrial power systems
In these systems, fast load transients—such as a CPU switching between low‑power and turbo modes—require inductors that support rapid current slew while keeping voltage deviations within tight limits. The combination of low DCR, tight coupling and high saturation current directly addresses this requirement.
Technical highlights
Within the TLVR offering, Coilcraft highlights two shielded inductor series optimized for different current and size points.
The SLV9080 series is a compact TLVR inductor option with automotive‑qualified variants:
- High saturation current up to 120 A
- Seven inductance values from 50 nH to 200 nH
- Compact footprint of 9.15 × 6.4 mm, supporting dense VRM layouts
- AEC‑Q200 qualified, making it suitable for automotive power applications where extended temperature range and reliability testing are required
Inductance values in the 50–200 nH range are typical for modern multi‑phase VRMs where high switching frequencies and large phase counts are used to deliver hundreds of amperes with low output ripple. AEC‑Q200 qualification indicates that the series has been tested against a standardized set of stress tests for passive components in automotive environments.
The SLV1211 series addresses even higher current rails while maintaining a compact form factor:
- High saturation current up to 152 A
- Six inductance values from 70 nH to 200 nH
- Compact 12 × 6 mm footprint
By providing higher saturation current in a slightly larger footprint, this series is positioned for the most demanding rails in processors, GPUs or custom accelerators. Designers can choose inductance values to balance transient response, ripple current and efficiency according to the converter’s switching frequency and control strategy.
Design‑in notes for engineers
When designing multi‑phase VRMs or PoL converters with TLVR inductors, several practical considerations can help ensure robust performance:
- Match inductance to control strategy: For a given switching frequency and number of phases, lower inductance values from the 50–200 nH range will typically improve transient response but increase ripple current, while higher inductance values reduce ripple at the cost of slower current slew. Selection should be made based on the allowable ripple and transient undershoot/overshoot.
- Verify current ratings against worst‑case conditions: Use both saturation and thermal ratings from the datasheet to ensure the chosen inductor can handle peak transient currents and steady‑state RMS currents, including margin for elevated ambient temperatures and restricted airflow.
- Layout around hot spots: The compact footprints of 9.15 × 6.4 mm and 12 × 6 mm allow careful placement close to the IC power pins, minimizing parasitic inductance in the current paths. Designers should keep loop areas small and use wide copper pours to reduce losses and improve thermal spreading.
- Consider automotive requirements early: If the end application targets automotive or transportation markets, selecting AEC‑Q200 qualified devices such as the SLV9080 series from the outset can avoid later redesigns. Also verify operating temperature range and any specific OEM or Tier‑1 qualification needs.
- Thermal management: Excellent thermal performance is highlighted for the TLVR family, but real‑world behavior still depends on PCB copper, airflow and neighboring hot components. Use manufacturer‑provided thermal derating curves along with system‑level thermal simulations or measurements to validate margin.
- EMI and shielding: Shielded TLVR inductors can help reduce radiated emissions compared to open‑frame designs. In dense VRM areas, consider overall EMI strategy, including filter placement, ground referencing, and where necessary additional input and output filtering to meet regulatory limits.
By combining low DCR, tight coupling and high saturation currents in compact shielded packages, the SLV TLVR series offers a practical option for engineers looking to optimize power density and transient performance in current‑generation and upcoming platforms.
Source
This article is based on information provided by Coilcraft in their product announcement and associated online TLVR inductor family pages, complemented with general power electronics design considerations.