AMT49413: High Power BLDC MOSFET Controller with Integrated Hall Commutation

Description

The AMT49413 is a 3-phase brushless DC (BLDC) motor controller for use with N-channel external power MOSFETs designed for automotive and industrial applications. Thanks to the internal commutation control (Hall sensor inputs), PWM current control to limit startup current, and a full suite of protection features, the AMT49413 includes the required logic to spin a motor without any code—allowing shorter design cycles.

The AMT49413 is designed to operate across a wide voltage range, including automotive applications up to 50V. A unique charge pump regulator provides adequate (>10 V) gate drive for battery voltages down to 7 V, and allows the device to operate with a reduced gate drive at battery voltages down to 5.5 V. Power dissipation in the charge pump is minimized by switching from a voltage doubling mode at low supply voltage to a dropout mode at the nominal running voltage of 14 V.  A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows for DC (100% duty cycle) operation.

Internal fixed-frequency PWM current control circuitry can be used to regulate the maximum load current. The peak load current limit is set by the selection of an input reference voltage and external sensing resistor. The PWM frequency is set by a user-selected external RC timing network. For added flexibility, the PWM input can be used to provide speed and torque control, allowing the internal current control circuit to set the maximum current limit.

Efficiency is enhanced by using synchronous rectification. A full suite of protection features is provided including MOSFET crossover control with dead time, undervoltage, overvoltage, HALL logic fault, low motor current and short to ground, supply and across motor winding. The dead time can be set by a single external resistor. Allegro recommended hall latches: APS13290-1.

The AMT49413 is supplied in a 48-pin QFN with exposed thermal pad and is available in a wettable flank for automotive applications. This is a small footprint (49 mm2) power package providing nearly a 40% footprint reduction compared to an equivalent QFP package.

Top Features

  • High current 3-phase gate drive for N-channel MOSFETs
  • AEC-Q100 Qualified
  • Synchronous rectification
  • Cross-conduction protection
  • Charge pump and top-off charge pump for 100% PWM
  • Integrated commutation decoder logic
  •  Operation over 5.5 to 50 V supply voltage range
  • Extensive diagnostics output
  • Provides +5 V Hall sensor power
  • Low-current sleep mode

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
AMT49413GEVATR 48-lead QFN/MLP -40°C to 105°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
APEK49413GEV-01-T DEMO BOARD -40°C to 105°C No -- Contact your
local sales rep
Check
Distributor Stock
AMT49413KEVSR-J 48-lead QFN/MLP -40°C to 125°C Yes View Data Contact your
local sales rep
Check
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.

Packaging