DRV8662 - Piezo Haptic Driver with Integrated Boost Converter

The DRV8662 is a single-chip piezo haptic driver with integrated 105 V boost switch, integrated power diode, and integrated fully-differential amplifier. This versatile device is capable of driving both high-voltage and low-voltage piezo haptic actuators. The input signal can be either differential or single-ended. The DRV8662 supports four GPIO-controlled gains: 28.8 dB, 34.8 dB, 38.4 dB, and 40.7 dB.

The boost voltage is set using two external resistors, and the boost current limit is programmable via the R_EXT resistor. The boost converter architecture will not allow the demand on the supply current to exceed the limit set by the R_EXT resistor; therefore, the DRV8662 is well-suited for portable applications. This feature also allows the user to optimize the DRV8662 circuit for a given inductor based on the desired performance requirements.

A typical start-up time of 1.5 ms makes the DRV8662 an ideal piezo driver for fast haptic responses. Thermal overload protection prevents the device from being damaged when over driven.

• High-Voltage Piezo Haptic Driver
  • Drives up to 100 nF at 200 V_PP and 300 Hz
  • Drives up to 150 nF at 150 V_PP and 300 Hz
  • Drives up to 330 nF at 100 V_PP and 300 Hz
  • Drives up to 680 nF at 50 V_PP and 300 Hz
  • Differential Output
• Integrated Boost Converter
  • Adjustable Boost Voltage
  • Adjustable Current Limit
  • Integrated Power FET and Diode
  • No Transformer Required
• Fast Start Up Time of 1.5 ms
• Wide Supply Voltage Range of 3.0 V to 5.5 V
• 1.8V Compatible Digital Pins
• Thermal Protection
• Available in a 4 mm × 4 mm × 0.9 mm QFN package (RGP)