Datasheet

DRV2667

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SLOS751A –MARCH 2013–REVISED JANUARY 2014

ADJUSTABLE BOOST CURRENT LIMIT

The current limit of the boost switch may be adjusted via a resistor to ground placed on the REXT pin. The

programmed current limit should be less than the rated saturation limit of the inductor selected by the user to

avoid damage to both the inductor and the DRV2667 . If the combination of the programmed limit and inductor

saturation is not high enough, then the output current of the boost converter will not be high enough to regulate

the boost output voltage under heavy load conditions. This will, in turn, cause the boosted rail to sag, possibly

causing distortion of the output waveform.

INTERNAL CHARGE PUMP

The DRV2667 has an integrated charge pump to provide adequate gate drive for internal nodes. The output of

this charge pump is placed on the VPUMP pin. An X5R or X7R storage capacitor of 0.1 μF with a voltage rating

of 10 V or greater must be placed at this pin.

THERMAL SHUTDOWN

The DRV2667 contains an internal temperature sensor that will shut down both the boost converter and the

amplifier when the temperature threshold is exceeded. When the die temperature falls below the threshold, the

device will restart operation automatically. Continuous operation of the device is not recommended. Most haptic

use models only operate the device in short bursts. The thermal shutdown function will protect the device from

damage when overdriven, but usage models which drive the device into thermal shutdown should always be

avoided.

Product Folder Links: DRV2667