The ATA6833/34 are industry's first brushless DC motor driver ICs with integrated driver, watchdog, voltage regulator, and LIN interface functionality in a single IC. This facilitates extremely small designs and helps to reduce overall system costs by about a third. Furthermore, the high integration level improves board quality by reducing the number of solder joints.
The ATA6833 is a BLDC motor System Basis Chip with 3 half-bridge gate drivers. The 3 push-pull stages with integrated charge pump can drive 6 external NMOS transistors. The integrated watchdog monitors the microcontroller, e.g., Atmel's automotive-qualified ATmega32M1, which in turn is supplied by an integrated voltage regulator programmed to 5V or 3.3V output voltage providing 100 mA current capability. An integrated LIN 2.1 transceiver -- based on Atmel's stand-alone LIN transceiver ATA6662 -- completes the system basis features. In standby mode, the current consumption is less than 50 microampere.
The ATA6834, the ATA6833's high-temperature companion, handles operating chip temperatures of up to 200 degrees Celsius and is therefore ideal for all high-temperature "under-the-hood" applications where actuators handle the flow of hot exhaust gas or hot oil. To implement space-saving designs, the ECUs can be attached to a turbo charger or used to build a mechatronic unit along with a pump motor.
The ATA6833/34 provide several protection features including a two-stage thermal warning and thermal shut-off as well as open-load, overload, short-circuit, and undervoltage detection with switch-off functionality. To protect the external NMOS transistors, a built-in shoot-through protection helps to avoid dangerous simultaneous activation of a high-side and a low-side transistor between supply and ground. Customers can adapt the dead time to the needs of their NMOS transistors by the value of an external resistor/capacitor combination.
These devices meet the strict automotive qualification demands (protection against conducted interference, EMC, and ESD protection) and can withstand transients as specified in ISO/TR 7637.
Availability and Pricing
Samples of the new brushless motor driver ICs ATA6833/34 are now available in QFN48 packages measuring only 7 mm x 7 mm. Pricing starts at US $2.95 for the ATA6833 and at US $3.30 for the ATA6834 for 10k-piece quantities each. An application board for development support, including a programmed AVR(R) microcontroller, can be ordered for US $139.
Footnote BCDMOS = Mixed-signal technology with Bipolar, CMOS and DMOS components BLDC = Brushless Direct Current ECU = Electronic Control Unit EMC = Electro Magnetic Compatibility ESD = Electro Static Discharge NMOS = N-type Metal Oxide Semiconductor QFN = Quad Flat No leads SOI= Silicon on Insulator
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Product information on Atmel's brushless motor driver ICs ATA6833/34 may be retrieved at: http://www.atmel.com/dyn/products/product_card.asp?part_id=4412 (ATA6833) http://www.atmel.com/dyn/products/product_card.asp?part_id=4411 (ATA6834)
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