INDUSTRY COMPONENT

High-Side & Low-Side MOSFETs

High-side and low-side MOSFETs are semiconductor switches in VRMs that regulate voltage by controlling current flow in complementary phases.

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Component Specifications

Definition
High-side and low-side MOSFETs are paired metal-oxide-semiconductor field-effect transistors used in synchronous buck converters within Voltage Regulator Modules (VRMs). The high-side MOSFET (control FET) switches input voltage to the inductor, while the low-side MOSFET (sync FET) provides a path for inductor current during off-cycles, enabling efficient DC-DC voltage conversion with minimal power loss.
Working Principle
In a VRM's synchronous buck converter, the high-side MOSFET turns on to apply input voltage to the inductor, storing energy. When it turns off, the low-side MOSFET conducts, allowing inductor current to freewheel, maintaining output voltage. They operate in complementary PWM cycles, with dead-time control to prevent shoot-through currents.
Materials
Silicon (Si) or wide-bandgap materials like Silicon Carbide (SiC) or Gallium Nitride (GaN) for high-frequency applications; copper or aluminum bond wires; epoxy molding compound packaging.
Technical Parameters
  • Package PowerPAK, SO-8, D2PAK, QFN
  • Rds(on) 1mΩ to 10mΩ
  • Current Rating 30A to 100A
  • Voltage Rating 20V to 100V
  • Gate Charge (Qg) 10nC to 100nC
  • Switching Frequency 100kHz to 2MHz
Standards
ISO 9001, JEDEC JESD22, AEC-Q101

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for High-Side & Low-Side MOSFETs.

MOSFET high-side MOSFET low-side MOSFET VRM voltage regulator power electronics synchronous buck converter switching transistor power management High-Side & Low-Side MOSFETs High-Side & Low-Side MOSFETs in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

VRM (Voltage Regulator Module)

A power regulation component that converts and stabilizes input voltage to precise levels required by GPU cores and memory.

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Engineering Analysis

Risks & Mitigation
  • Thermal runaway due to poor heatsinking
  • Gate oxide breakdown from voltage spikes
  • Shoot-through current if dead-time is insufficient
  • Electromigration at high temperatures
FMEA Triads
Trigger: Excessive junction temperature
Failure: MOSFET thermal shutdown or permanent damage
Mitigation: Implement thermal monitoring, use adequate heatsinks, and ensure proper airflow in the system.
Trigger: Voltage transients from inductive loads
Failure: Gate-source overvoltage leading to breakdown
Mitigation: Add snubber circuits, use MOSFETs with higher Vgs ratings, and incorporate TVS diodes.
Trigger: Insufficient dead-time in PWM control
Failure: Shoot-through current causing high power dissipation
Mitigation: Optimize dead-time in the controller IC, use gate drivers with adjustable timing.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for voltage regulation, ±10% for current handling under specified conditions
Test Method
Dynamic load testing, thermal cycling per JESD22-A104, electrical characterization with curve tracers and oscilloscopes

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between high-side and low-side MOSFETs in a VRM?

The high-side MOSFET switches the input voltage to the inductor, while the low-side MOSFET provides a current path during the off-cycle, reducing conduction losses and improving efficiency.

Why are MOSFETs used in pairs in VRMs?

Paired MOSFETs enable synchronous rectification, where the low-side MOSFET replaces a diode, lowering voltage drop and power loss, especially at high currents.

What are key parameters when selecting these MOSFETs?

Critical specs include Rds(on) for conduction loss, gate charge for switching speed, voltage/current ratings, and thermal resistance for heat dissipation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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