SLOS861B March   2015  – April 2015 DRV2700

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Boost + Amplifier Configuration
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Typical characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Boost Converter and Control Loop
      2. 8.3.2 High-Voltage Amplifier
      3. 8.3.3 Fast Start-Up (Enable Pin)
      4. 8.3.4 Gain Control
      5. 8.3.5 Adjustable Boost Voltage
      6. 8.3.6 Adjustable Boost Current-Limit
      7. 8.3.7 Internal Charge Pump
      8. 8.3.8 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Boost + Amplifier Mode
      2. 8.4.2 Flyback Mode
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 AC-Coupled DAC Input Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Piezo Load Selection
          2. 9.2.1.2.2  Programming The Boost Voltage
          3. 9.2.1.2.3  Inductor and Transformer Selection
          4. 9.2.1.2.4  Programing the Boost and Flyback Current-Limit
          5. 9.2.1.2.5  Boost Capacitor Selection
          6. 9.2.1.2.6  Pulldown FET and Resistors
          7. 9.2.1.2.7  Low-Voltage Operation
          8. 9.2.1.2.8  Current Consumption Calculation
          9. 9.2.1.2.9  Input Filter Considerations
          10. 9.2.1.2.10 Output Limiting Factors
          11. 9.2.1.2.11 Startup and Shutdown Sequencing
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Filtered AC Coupled Single-Ended PWM Input Application
      3. 9.2.3 DC-Coupled DAC Input Application
      4. 9.2.4 DC-Coupled Reference Input Application
      5. 9.2.5 Flyback Circuit
    3. 9.3 System Example
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Boost + Amplifier Configuration Layout Considerations
      2. 11.1.2 Flyback Configuration Layout Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGP|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 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

2 Applications

  • Piezo Positioning Actuators
  • Piezo Sounder Driver
  • Piezo Inkjet Printer
  • Piezo Transducers
  • Piezoelectric Micropumps

3 Description

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.

Device Information(1)

DEVICE NAME PACKAGE BODY SIZE (NOM)
DRV2700 VQFN (20) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Boost + Amplifier Configuration

DRV2700 blockDiag_slos861.gif