A4900: High Voltage Three Phase Gate Driver


The A4900 is a high-voltage, high-speed, power IGBT or MOSFET driver providing three independent half-bridge channels for three-phase applications.

A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs or IGBTs used as high current switches. Direct control over all six gate drives in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power switches are protected from cross-conduction by integrated crossover control and fixed dead time.

Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults. They can be configured to protect the power switches under most short circuit conditions. Detailed diagnostics are available as a serial data word output.

The A4900 is provided in a 44-pin QSOP package (suffix LQ) that is lead (Pb) free, with 100% matte tin leadframe plating.

This part is discontinued. Samples are no longer available. Date of status change: September 1, 2016.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

Top Features

  • High voltage 3-phase gate drive
  • Floating high-side gate drive to 550 VDC supply
  • Tolerant to high voltage slew rates
  • Cross-conduction protection with fixed dead time
  • 15 V gate drive supply voltage
  • TTL compatible logic inputs
  • Undervoltage detection
  • Overcurrent detection with integrated fault blanking
  • Overtemperature shutdown
  • Matched propagation delays
  • Detailed fault reporting

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A4900KLQTR-T 44-lead QSOP -40°C to 125°C Yes View Data Discontinued Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.