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VOLUME -22 NUMBER 10
Publication Date: 10/1/2007
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October 2007 Issue
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Melexis: Vibration Motor Driver IC
Vibration motor driver IC.
Concord -- NH A new low-power-consuming vibrator element for cell phones has been introduced by Melexis, the MLX90283, which reportedly brings new capabilities in packaging and power efficiency to this ubiquitous feature. This single phase brushless vibration motor driver IC allows increased battery life while still delivering strong and clearly detected vibrations.
The new IC can also benefit applications for force feedback or haptic interfaces in gaming systems, both handheld and home systems. The IC integrates Hall-effect sensor, digital and power driver circuitry into a low profile Ultra-thin QFN package and introduces the new proprietary "Active Start" design to improve single phase vibration motor start-up reliability. The 1.8V to 3.6V operating voltage range perfectly suits battery-powered applications. Vibration motors are mostly battery powered and are subject to stringent input power requirements. Further reduction of current consumption for battery-saving is of primary interest but is challenged by the need for large vibrations, meaning high rotation speed.
The MLX90283 successfully applies the "Freewheel" principle to vibration motors by exploiting single-phase motor characteristics. In normal rotation, a conventional driver IC supplies the motor even when the rectified sinusoidal angular torque approaches zero. This conflicts with power management objectives as the motor consumes unneeded energy. By contrast, the MLX90283 switches off its outputs when the torque approaches zero and delays the next switch-over using a "Freewheel delay" of 92µs (typical). As the device activates the "Freewheel" when the torque is close to zero, the rotational speed is unchanged.
The MLX90283 "Freewheel" intelligent driving enables the reduction of the average motor current consumption up to 10mA, while keeping the same rotation speed, resulting in high efficiency levels.
For more information, contact: Melexis USA, 41 Locke Rd., Concord, NH 03301
603-223-2362 fax: 603-223-9614 E-mail: email@example.com Web:
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