AMT49413: 3-Phase BLDC Controller and MOSFET Driver

The AMT49413 is a 3-phase brushless DC (BLDC) motor controller for use with N-channel external power MOSFETs. It incorporates much of the circuitry required to design a cost effective three-phase motor drive system.

The AMT49413 provides functionality over a wide input supply range. 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.

The AMT49413 is supplied in a 48-pin QFN with exposed thermal pad. This is a small footprint (49 mm2) power package, that is lead (Pb) free, with 100% matte-tin leadframe plating.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • High current 3-phase gate drive for N-channel MOSFETs
  • 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
AMT49413 Packages

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AMT49413 Product Image AMT49413 Block Diagram AMT49413 Typical Application

Part Number Specifications and Availability

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

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