DRV2700 - DRV2700 High Voltage Driver with Integrated Boost Converter

The DRV2700 device is a single-chip piezo driver with an 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 piezoelectric loads. The input signal can be either differential or single-ended and AC or DC coupled. The DRV2700 device 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. The boost current-limit is programmable through the R_(REXT) resistor. The boost converter architecture does not allow the demand on the supply current to exceed the limit set by the R_(REXT) resistor which allows the user to optimize the DRV2700 circuit for a given inductor based on the desired performance requirements. Additionally, this boost converter is based on a hysteretic architecture to minimize switching losses and therefore increase efficiency.

A typical startup time of 1.5 ms makes the DRV2700 device an ideal piezo driver for coming out of sleep quickly. Thermal overload protection prevents the device from damage when overdriven.

• 100-V Boost or 1-kV Flyback Configuration
• ±100-V Piezo Driver in Boost + Amplifier
  Configuration
  • 4 GPIO-Adjustable Gains
  • Differential or Single-Ended Output
  • Low-Voltage Control
  • AC and DC Output Control
• 0 to 1-kV Piezo Driver in Flyback Configuration
  • Low-Voltage Control
  • AC and DC Output Control
• Integrated Boost or Flyback Converter
  • Adjustable Current-Limit
  • Integrated Power FET and Diode
• Fast Startup Time of 1.5 ms
• Wide Supply-Voltage Range of 3 to 5.5 V
• 4-mm × 4-mm × 0.9-mm VQFN package
• 1.8-V Compatible Digital Pins
• Thermal Protection