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Category: Power ICs: Drivers
Finalist: SA306-IHZ motor-drive IC (Cirrus Logic)
 The SA306-IHZ from Cirrus Logic delivers the industry’s highest output current for a pwm IC at 17 A PEAK, and 5 A continuous. The SA306-IHZ accomplishes this through cycle-by-cycle current limiting, and an “upside down” mounting technique that increases power dissipation by 3X. Cycle-by-cycle current limiting generates fault signals for the microcontroller to allow it to take the appropriate action in real-time for each motor phase rather than just settling for limiting the overall current to a safe value. A pre-set limit can be established for each individual phase, and in an over current condition, the driver will shut down all outputs for the remainder of the switching cycle and re-set the outputs with the start of the next cycle. This level of control can allows for better torque control. IN addition, cycle-by-cycle current limit allows a motor to soft-start by enabling the driver to handle the inrush of start-up current without needing to de-rate the driver’s current rating, even at 5 A continuous or greater. By cutting a hole in the printed circuit board, the device can be mounted upside down through the board allowing an increase in power dissipation by up to 3X. By flipping the package over, a very modest heatsink can now be flush mounted to the heat tab on the package bottom, and the bump in heat dissipation can go as high as 17 W.
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