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DC motor drivers target battery-powered apps

Posted: 19 Apr 2012 ?? ?Print Version ?Bookmark and Share

Keywords:motor driver? microstepping indexer? MCU?

Texas Instruments Inc. (TI) has added three new low-voltage products to its line of DRV8x motor drivers for brushed DC and stepper motors. The DRV8834, DRV8835 and DRV8836 provide low RDS(ON) and ultra-low sleep currents, slashing power consumption by about 80 percent, boasted the company. TI added that the devices improve thermal performance and increase system reliability.

The on-chip 32-step microstepping indexer and advanced motion control features on the DRV8834 minimize torque ripple for quiet, ultra-smooth motion in applications such as security video cameras, medical and office automation equipment, described the company. The devices' low RDS(ON) of 305m? and an ultra-low sleep current as low as 10nA improves thermal performance and extends battery life in applications such as toys, e-locks, cameras, POS printers and smart meters, added TI.

Additionally, the devices boast high level of integration, such as an on-chip indexer and current control loops that provide greater intelligence to reduce design complexity while minimizing MCU MIPS requirements and software development. This speeds up time to market compared to discrete solutions, the company indicated.

Evaluation modules (EVMs) are available to quickly evaluate all three devices. Suggested retail pricing for the DRV8834EVM is $99. The DRV8835EVM and DRV8836EVM are available for a suggested retail price of $49.

The devices are highly integrated in an ultra-small package, reducing board space by as much as 95 percent compared to discrete implementations, TI claimed. The DRV8x devices are all available for sampling and purchase.

The DRV8834 stepper motor driver featuring 2.5-10.8V operating range and up to 2.2A peak output current is available in 8 x 6mm HTSSOP package, while the 4 x 4mm QFN package will be available in 2Q12. The price is $1.15 for the HTSSOP or QFN option.

The DRV8835 stepper or brushed DC motor driver with 2-11V operating range and up to 1.5A output current per bridge is available in 2 x 3mm WSON package for $0.70. This device includes separate logic and motor power supplies.

The DRV8836 stepper or brushed DC motor driver delivering 2-7V operating range and up to 1.5A output current per bridge is available in 2 x 3mm WSON package for $0.70. The motor driver includes a dedicated sleep pin. All prices quoted are based on 1,000-unit quantities.

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