OptiMOS™ logic level

Logic level MOSFETs for applications requiring low VGS

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Overview

Available in a variety of voltages, Infineon’s logic level MOSFETs are available in a wide range of packages, suitable for wireless charging, laptop adapter, and telecom applications and many more.

Key Features

  • Low RDS(on) and Qg in small package
  • High power density designs
  • High switching frequency
  • Logic level compatible
  • Drive directly from microcontroller
  • System cost reduction
  • Smallest form factor in SOT-23

Products

About

Logic level MOSFETs with low Qg

These devices’ low gate charge (Qg) reduces switching losses without compromising the conduction performance. The improved figures of merit allow operations at high switching frequencies. Furthermore, the logic level drive provides a low gate threshold voltage (Vgs(th)) allowing the MOSFETs to be driven at 5 V and directly from microcontrollers.

Power MOSFET threshold voltage overview

Definition of gate threshold voltage, Vgs(th): Minimum amount of gate-to-source voltage required to create a conducting path between the source and drain terminals of the power MOSFET.

Infineon (and the industry) offers a variety of options when it comes to the threshold voltages:

  • Normal level (NL) with gate threshold voltage range from ~2 to 4 V
  • Logic level (LL) with gate threshold voltage range from ~1 to 3 V
  • Super logic level (SLL) with gate threshold voltage range from ~0.5 to 1 V
Why use logic level MOSFETs

In low-frequency applications, the MOSFET can be driven directly from a microcontroller, eliminating the need for an external MOSFET driver. Some systems have limited bus voltages (5 V, for example) thereby requiring the use of logic level/super logic level devices.

Why use normal level (NL) devices

In noisy environments, the elevated threshold voltage prevents false turn-on of the MOSFET. These devices provide lower gate charge and RDS(on) and are not typically limited to <= 100 V devices.

Logic level MOSFETs with low Qg

These devices’ low gate charge (Qg) reduces switching losses without compromising the conduction performance. The improved figures of merit allow operations at high switching frequencies. Furthermore, the logic level drive provides a low gate threshold voltage (Vgs(th)) allowing the MOSFETs to be driven at 5 V and directly from microcontrollers.

Power MOSFET threshold voltage overview

Definition of gate threshold voltage, Vgs(th): Minimum amount of gate-to-source voltage required to create a conducting path between the source and drain terminals of the power MOSFET.

Infineon (and the industry) offers a variety of options when it comes to the threshold voltages:

  • Normal level (NL) with gate threshold voltage range from ~2 to 4 V
  • Logic level (LL) with gate threshold voltage range from ~1 to 3 V
  • Super logic level (SLL) with gate threshold voltage range from ~0.5 to 1 V

Why use logic level MOSFETs

In low-frequency applications, the MOSFET can be driven directly from a microcontroller, eliminating the need for an external MOSFET driver. Some systems have limited bus voltages (5 V, for example) thereby requiring the use of logic level/super logic level devices.

Why use normal level (NL) devices

In noisy environments, the elevated threshold voltage prevents false turn-on of the MOSFET. These devices provide lower gate charge and RDS(on) and are not typically limited to <= 100 V devices.

Documents

Documents

Design resources

Developer community

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