This new device is aimed at high-current BLDC motor applications for speed, position, or torque control requirements. It has been designed for battery-powered power tools, lawn and garden equipment, factory automation, pumps, fans, blowers, and household appliance applications in both consumer and industrial markets.
The AMT49413 offers functionality across a wide input power range. A dedicated charge pump regulator provides adequate gate drive (>10 V) for battery voltages as low as 7 V and allows the device to operate with a reduced gate drive at supply voltages as low as 5.5 V. A start capacitor is used to provide the necessary battery supply voltage for the N-channel MOSFETs. An internal charge pump for the drive enables DC operation (100% duty cycle).
The internal fixed-frequency PWM current control circuit can be used to regulate the maximum load current. The maximum load current limit is set by selecting an input reference voltage and an external sense resistor. The PWM frequency is set by a user-selectable 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 improved by synchronous rectification.
A full suite of protection features is provided, including MOSFET trip, undervoltage, overvoltage, Hall effect logic fault, low motor current, and short to ground, supply, and across the motor winding. Dead time can be adjusted by a single external resistor.
The AMT49413 is supplied in a 48-pin QFN package with an exposed heat sink. It is a small-size (7 mm × 7 mm) power package that is lead-free (Pb) with 100% matte tin-plated lead plating.

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