DISCONTINUED: This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: August 10th, 2023.
Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.
The A4937 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications.
A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A4937 to operate with a reduced gate drive, down to 5.5 V.
A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs.
Full control over all six power MOSFETs in the 3-phase bridge is provided, through an SPI compatible serial interface, allowing motors to be driven with block or overlap commutation. Power output can be regulated by one or both of the PWM inputs. The power MOSFETs are protected from shoot-through by integrated crossover control and programmable dead time.
Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults, and can be configured to protect the power MOSFETs under most short circuit conditions. Detailed diagnostics are available as a serial data word.
Allegro recommended automotive qualified hall latches: APS122x5 and APS122x0
The A4937 is supplied in a 28-pin TSSOP power package with with exposed pad for enhanced thermal dissipation (package type LP). This package is lead (Pb) free, with 100% matte tin leadframe plating.
Applications
- Electronic power steering (EPS, EHPS, EAS)
- Hydraulic pumps
- Gearbox actuator
