What is a Gate Driver parameter?

A Gate Driver parameter is a measurable electrical, timing, isolation, mechanical, thermal, interface, robustness, or qualification specification used to determine whether a driver fits a power-switch application. Parameters describe both the operating envelope and the behavior of the device under defined test conditions.

Typical examples include peak source and sink current, pull-up and pull-down resistance, supply-voltage range, undervoltage-lockout thresholds, propagation delay, channel-to-channel skew, minimum pulse width, common-mode transient immunity, isolation working voltage, creepage, clearance, junction-temperature range, and package type.

A parameter is useful only when its definition and test conditions are understood. Two devices can quote the same headline value while differing in load, supply, temperature, pulse duration, measurement threshold, polarity, or failure criterion. Final comparison therefore requires the current datasheet, the selected switch datasheet, and worst-case system conditions.

Parameters versus features

A feature is a function the device provides. A parameter quantifies how that function behaves. Keeping the distinction clear prevents a feature checklist from replacing engineering comparison. Examples of feature-parameters pairs are listed in the table below.

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Step-by-step Gate Driver selection workflow

  • 1. Define the power switch and operating points. Identify IGBT, Si MOSFET, SiC MOSFET, or GaN HEMT; bus voltage; switching frequency; duty cycle; gate-charge curve; gate-voltage limits; and short-circuit behavior.
  • 2. Lock the topology and channel architecture. Determine low-side, high-side, half-bridge, full-bridge, three-phase, dual-floating, isolated single/dual, or other configuration. Establish each output reference and the required channel independence.
  • 3. Set the gate-bias and drive-strength target. Define positive and negative gate-bias rails, estimate source/sink current, and evaluate output resistance, external gate resistance, reverse current, pulse conditions, driver loss, EMI and overshoot.
  • 4. Choose voltage class and isolation concept. Apply margin for the DC bus, ringing and transients. If galvanic isolation is required, select the insulation class from the applicable system standard and verify all barrier and spacing ratings.
  • 5. Check timing and usable PWM range. Review propagation delay, delay matching, rise/fall behavior, minimum pulse width, pulse-width distortion, input filtering, deadtime and startup or recovery timing.
  • 6. Check transient and interface robustness. Verify CMTI, negative switch-node tolerance, logic-operational limits, UVLO behavior, input thresholds, hysteresis, default state, and 3.3 V or 5 V compatibility.
  • 7. Select package, thermal range and qualification. Confirm package, pinout, creepage, clearance, isolation capacitance, thermal resistance, power dissipation, temperature range, MSL, ESD, industrial or automotive qualification, certification and safety support.
  • 8. Add protection, control and diagnostic features. After the electrical envelope is fixed, select DESAT/OCP, Miller clamp, soft-off, two-level turn-off, sensing, bootstrap, slew-rate control, fault signaling or digital configuration as needed.
  • 9. Shortlist and validate. Use the parametric table or recommendation tool, then verify current datasheets, models, layout, startup, switching, fault response, EMI, thermal behavior and worst-case hardware performance.

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Gate Driver parameter groups explained

Power device type and gate requirements 

Start with the switch datasheet. Record recommended turn-on and turn-off gate voltages, absolute gate limits, total and Miller gate charge (Qg and Qgd), threshold range, internal gate resistance and short-circuit behavior. IGBTs, Si MOSFETs, SiC MOSFETs and GaN HEMTs can require different bias and protection schemes. 

Parameters to compare

  • Switch technology 
    Identify IGBT, silicon MOSFET, SiC MOSFET or GaN HEMT; each has a different gate-drive envelope.
  • Gate-voltage limits 
    Keep gate bias, ringing and transients within the switch’s absolute maximum ratings. 
  • Turn-on and turn-off gate bias 
    Compare the switch’s recommended VGS/VGE values and allowable negative bias with the driver’s output supply. 
  • Threshold and gate resistance 
    Check threshold spread, internal resistance and recommended external gate resistance when setting noise margin and speed.
  • Gate charge and Miller charge
    Use Qg and Qgd at relevant operating conditions to estimate drive current and switching behavior. 
  • Short-circuit behavior 
    Use the switch’s fault withstand and turn-off guidance to set protection and shutdown requirements. 

Topology and number of channels 

Topology sets the number and reference of driver outputs. A low-side switch may need one ground-referenced output; a half-bridge needs high- and low-side drive; a full bridge typically needs four outputs and a three-phase inverter six. Check channel independence, shared supplies, fault handling, interlock and floating or isolated references.

Parameters to compare

  • Topology and output reference
    Choose low-side, floating high-side, half-bridge, full-bridge, three-phase or isolated drive as the circuit requires.
  • Channel count and independence
    Count the outputs and check whether their supplies, grounds, enable and fault functions are shared.
  • Input and output polarity 
    Check inverting/non-inverting behavior and the state of each output when inputs or enable are inactive. 
  • Interlock and shoot-through prevention 
    Where provided, check how the driver prevents simultaneous conduction and how this affects control timing.

Output current and output resistance 

Source current charges the gate; sink current discharges it. Compare peak-current definitions, source and sink separately, pull-up/pull-down resistance, external gate resistance, pulse duration and thermal dissipation. I ≈ Qg/t is only an initial average-current estimate: verify current at the Miller plateau, losses, overshoot and EMI. 

Parameters to compare

  • Peak source current  
    Check the current available to charge the gate, including the specified output voltage and pulse test condition. 
  • Peak sink current
    Check turn-off current separately; the pull-down path may have a different rating from the pull-up path.
  • Pull-up and pull-down resistance 
    Compare output resistance over supply and temperature to estimate current at the Miller plateau.
  • Output structure and external booster 
    Check separate source/sink outputs, external gate-network options and whether a booster is needed. 
  • Reverse current and output clamping
    Check current flowing back into the output and any clamping or active-shutdown behavior during transients. 
  • Output-stage dissipation
    Verify switching-related driver loss and temperature, not just a headline peak-current value.  

Driver voltage class and supply range

Voltage class relates to supported switch-node offset or domain voltage, with the exact definition depending on driver configuration. It is not gate-drive supply voltage or isolation voltage. Check bus and transient margin, VCC/VDD/VEE/VB/VBS operating and absolute-maximum ranges, positive/negative bias, quiescent current and bootstrap refresh or startup needs.

Parameters to compare

  • Driver voltage class 
    Check the datasheet definition of the supported switch-node offset, domain or supply class for the chosen architecture. 
  • Input- and output-side supply ranges 
    Compare VCC, VDD, VEE, VB and VBS operating ranges with the required positive and negative gate bias.
  • Operating versus absolute maximum ratings 
    Use the operating range for normal design; absolute maximum values are not continuous operating targets.
  • Quiescent and startup current
    Size bias supplies for steady-state demand and startup behavior.
  • Bootstrap diode or switch 
    Check charging resistance, reverse behavior, capacitor requirements and overcharge control where integrated.
  • Charge pump and refresh 
    Check startup, high-side on-time and duty-cycle limits for the actual supply architecture. 

Isolation type and ratings 

Choose non-isolated, functional, basic or reinforced isolation according to the system insulation concept and applicable standard. Verify working, repetitive peak, transient, surge and test voltages, barrier lifetime, creepage, clearance, material group, pollution degree, altitude and device/package certification. A test-voltage figure alone is insufficient.

Parameters to compare

  • Isolation class 
    Select functional, basic or reinforced insulation from the applicable system standard and insulation concept. 
  • Working and repetitive peak voltage 
    Check the applicable continuous and repetitive barrier ratings, not only a test-voltage headline.
  • Transient, surge and dielectric test voltage
    Check each rating against its stated test conditions and the system’s overvoltage requirements. 
  • Barrier lifetime and capacitance 
    Review lifetime assumptions and coupling across the barrier when assessing insulation and common-mode current. 
  • Creepage and clearance 
    Verify package spacing together with material group, pollution degree, altitude and PCB implementation. 
  • Certification 
    Confirm the exact device, package and certificate rather than assuming a family-wide approval. 

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Propagation delay, matching and pulse handling 

Compare turn-on/off propagation delay under defined test conditions and determine whether matching means channel-to-channel, edge-to-edge or part-to-part variation. Minimum pulse width is the shortest reliably transferred input pulse; pulse-width distortion is the input-to-output pulse-duration difference. Include both in narrow-PWM and deadtime analysis alongside filtering, rise/fall and recovery times. 

Parameters to compare

  • Turn-on and turn-off propagation delay 
    Compare input-to-output delay at the stated supply, load, temperature and measurement thresholds. 
  • Delay matching and skew 
    Determine whether the rating covers channels, edges, complementary outputs or different devices.
  • Output rise and fall time 
    Read the specified load and test setup; driver output transition time is not the power-switch transition time.
  • Minimum pulse width 
    Check the shortest input pulse that is reliably transferred to the output.
  • Pulse-width distortion  
    Check the difference between input and output pulse duration, especially at narrow PWM duty cycles.
  • Deadtime range and tolerance  
    Where integrated, check programmed or fixed deadtime together with worst-case delay variation. 
  • Enable, startup and recovery timing 
    Check enable/disable, UVLO recovery and fault-reset delays before defining restart behavior. 

CMTI and negative-transient robustness

CMTI describes immunity to common-mode voltage slew under specified polarity, voltage, output state and failure criteria. Compare those conditions with the application’s worst-case slew rate. For level-shift drivers also check negative switch-node depth/duration, logic-operational range, reverse current and recovery. Layout and parasitic coupling remain important. 

Parameters to compare

  • Common-mode transient immunity (CMTI)  
    Compare the specified slew-rate immunity, polarity, voltage, output state and failure criterion. 
  • Negative switch-node tolerance  
    Check allowable negative VS/HS excursion, duration, operating limits and recovery. 
  • Reverse current and ground shift  
    Review current paths and input-reference tolerance when fast switching moves local potentials.
  • ESD and transient robustness 
    Review specified HBM/CDM, latch-up and pin absolute maximum ratings for the exact device.

UVLO and input logic compatibility 

Check UVLO rising and falling thresholds, hysteresis, output state, channel independence and recovery time against gate-bias tolerances. Confirm input VIH/VIL, hysteresis, input current, polarity, default state, pin limits and 3.3 V or 5 V compatibility; differential inputs require common-mode and timing review. 

Parameters to compare

  • UVLO rising and falling thresholds 
    Check when the output enables and disables as the bias supply rises or falls. 
  • UVLO hysteresis and output state
    Check noise margin, channel independence and the defined output behavior during undervoltage. 
  • Logic-high and logic-low thresholds 
    Compare VIH/VIL, input current and logic-supply range with the controller’s actual levels. 
  • Input hysteresis and filtering 
    Check Schmitt-trigger or filter behavior against noise and minimum-pulse requirements.
  • Default and fail-safe state 
    Check internal pulls, input polarity, enable state and output behavior at startup or loss of control. 
  • Differential input common-mode range 
    For differential or TDI interfaces, check permissible ground shift and timing limits. 

Package, creepage, clearance and thermal limits 

Package affects board area, pinout, spacing, parasitics and manufacturability. Verify package creepage and clearance in the board design; junction/ambient temperature, thermal resistance, output-stage dissipation, exposed-pad requirements, moisture sensitivity and ESD performance at the intended operating conditions.

Parameters to compare

  • Package, pinout and pitch 
    Compare body size, pin arrangement, exposed pad and layout or replacement constraints. 
  • Creepage and clearance on the board 
    Verify the actual package-to-PCB spacing rather than relying on package dimensions alone.
  • Operating temperature  
    Check junction and ambient ranges for the intended industrial or automotive conditions. 
  • Thermal resistance and power dissipation 
    Evaluate output-stage loss and junction temperature using the real PCB copper and ambient conditions. 
  • Moisture sensitivity and assembly 
    Check MSL and manufacturing requirements for the selected package.
  • ESD, latch-up and absolute maximums 
    Review device robustness ratings alongside layout and handling requirements. 

Qualification and functional-safety support 

Verify AEC-Q100 status for the exact automotive part, and relevant industrial or isolation certificates for the specific product and package. Safety documentation can support a system safety concept, but component qualification does not itself establish an ASIL or SIL claim. Confirm assumptions, diagnostics, product status and system-level validation. 

Parameters to compare

  • Automotive or industrial qualification 
    Confirm the qualification and temperature grade of the exact orderable device; check AEC-Q100 where required.
  • Isolation approvals
    Verify applicable UL, VDE or IEC documentation for the exact package and part.
  • Functional-safety documentation
    Check availability and assumptions of safety manuals, failure-rate data and FMEDA support. 
  • Protection thresholds and timing 
    If DESAT or OCP is selected, check threshold, blanking, filter, response and reset parameters. 
  • Miller clamp and controlled turn-off 
    Where used, check clamp threshold/current, soft-off current and two-level turn-off level/time. 
  • Slew-rate control 
    Where programmable, check available drive settings, resolution, timing and turn-on/turn-off independence. ~
  • Sensing and diagnostic interface 
    Where integrated, check gain, offset, bandwidth, fault/ready timing, register and SPI/I²C behavior. 
  • Product status and lifecycle 
    Check availability, change notifications and replacement needs for the chosen part. 

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Frequently asked questions about Gate Driver's parameters

What are the most important Gate Driver parameters?

Start with switch compatibility, topology, channel count, voltage class, source/sink current, output resistance, supply range, isolation, timing, CMTI, negative-transient behavior, UVLO, logic interface, package, thermal limits and qualification. The priority changes with the application.

Use I ≈ Qg/t only as a first estimate. Then verify current around the Miller plateau, total pull-up and pull-down resistance, switching frequency, pulse conditions, driver dissipation, EMI, overshoot and the switch gate-charge curve at the intended operating point.

No. Compare the peak-current definition and test condition, output resistance, current at the relevant output voltage, pulse duration, source/sink asymmetry, reverse-current behavior, supply voltage and thermal performance.

Voltage class describes the supported switch-node offset or application domain, with the exact definition depending on configuration. Gate-drive supply is the local voltage used by the output stage. Isolation ratings characterize the galvanic barrier. They answer different design questions.

It is a specified difference in delay between channels, edges or parts under defined conditions. Determine whether the datasheet specifies channel-to-channel, rise-to-fall, complementary-edge or part-to-part matching before using the value in a deadtime budget.

Minimum pulse width determines whether a narrow PWM command is transferred reliably. Pulse-width distortion changes the duration of the output pulse relative to the input. Both can limit usable duty cycle at high switching frequency.

It should exceed the worst-case common-mode slew rate at the driver with suitable design margin. Compare test polarity, common-mode voltage, output state, static or dynamic method, PVT conditions and failure criterion.

Choose rising and falling thresholds that keep the power switch safely off below its usable gate voltage while permitting normal operation across bias-supply tolerance and temperature. Also check hysteresis, output state and recovery timing.

They are features. DESAT threshold, blanking, filter and response time are parameters. Miller-clamp threshold, current and activation behavior are parameters.

It determines topology fit and integration, but also affects output references, shared supplies, enable/fault grouping, timing coordination, package size and fault behavior.

No. A table is a shortlisting tool. Final selection requires the current driver and switch datasheets, safety requirements, simulation, layout review and hardware validation.

No. Component qualification and available safety documentation can support a system safety concept, but the system designer remains responsible for the final ASIL/SIL claim, diagnostics, assumptions and validation