3 November 2020

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Gate Driver Controller for power switch

CHT-THEMIS is the controller block of the Power Transistor Driver solution CHTTHEMIS and CHT-ATLAS. The chipset is specifically designed to drive wide-bandgap power transistors, in particular Gallium Nitride (GaN) and Silicon Carbide (SiC) devices including normally-On and normallyOff JFETs, MOSFETs and BJTs. It is also used with standard silicon MOSFETs and IGBTs in standard temperature applications (e.g. 125°C) where it brings an increase in reliability and lifetime by an order of magnitude compared to traditional solutions. CHT-THEMIS can drive up to 5 CHTATLAS chips for very high power applications that require up to ±20A to the gate of the power device. It implements a state machine that manages the control and the fault signals, it embeds a voltage reference as well as a 5V linear voltage regulator which is used to supply CHT-ATLAS. This 5V power supply can also be used to power up other external circuits, such as the isolated transceiver CHT-RHEA for complete isolated gate-drive implementations. The circuit features an adjustable under-voltage lockout (UVLO) function with hysteresis as well as a de-saturation detection circuit. It also includes a pulse generation pre-driver to accommodate for Normally Off SiC JFET. CHT-THEMIS also features an active Miller clamping (AMC) function and predriver for an external transistor. 

Typical performances:

  • Temperature range: -55°C to 225°C
  • Supply Voltage: 5 to 30V
  • Adjustable Under-voltage lockout (UVLO)
  • De-saturation detection circuit
  • Active Miller clamping (AMC) support
  • Available Package: Ceramic SOIC28



  • Intelligent Power Modules (IPM)
  • Power conversion, power generation and actuator controls in aeronautics
  • Solar inverters
  • Motor drives, battery chargers and
  • DC-DC converters in EV / HEV
  • Power conversion and motor drive in railway
  • Switched mode power supplies (SMPS)
  • Wind turbine power converters

An evaluation kit EVK-THEMIS-ATLAS implementing a high-temperature power transistor driver and controller based on CHT-THEMIS and CHT-ATLAS is available at Cissoid.

If you need support for your high temperature design, contact Cissoid.

Download CISSOID's Altium Library for IC symbols and package footprints. For installation, read the related Application Note.

Ordering information

Product name Ordering reference Package Marking