The A4939 is a three-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 at battery voltages down to 7 V and allows the A4939 to operate with reduced gate drive at battery voltages down to 5.5 V. A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs.
One logic level input is provided for each of the six power MOSFETs in the 3-phase bridge, allowing motors to be driven with any commutation scheme defined by an external controller. The power MOSFETs are protected from cross-conduction by integrated crossover control.
Motor phase short-to-supply and short-to-ground detection is provided by independent drain-source voltage monitors on each MOSFET. Short faults, supply undervoltage, and chip overtemperature conditions are indicated by a single open drain fault output.
Allegro recommended automotive qualified hall latches: APS122x5 and APS122x0
Product variants incorporating a low drop out (LDO) regulator to source either 5.0 V or 3.3 V to external circuitry are available. The A4939 is supplied in a 28-pin TSSOP power package with an exposed thermal pad (package type LP). This package is lead (Pb) free, with 100% matte tin leadframe plating (suffix T).
|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|APEK4939KLP-01-T||DEMO BOARD||-20°C to 85°C||No||--||Contact your
local sales rep
|A4939KLPTR-5-T||28-lead TSSOP||-40°C to 150°C||Yes||View Data||Contact your
local sales rep
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.