CapDrive® Ultra-Low Power Piezo Driver (BOS1901)

190 Vpk-pk Piezo Haptic Driver Powered by CapDriveTM
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  • High-Voltage Low Power Piezo Driver
    • Drives 100 nF at 190 Vpk-pk and 300 Hz with only 350 mW
    • Drives Capacitive Load up to 820 nF
    • Energy Recovery
    • Differential Output
    • Miniature Solution Footprint, WLCSP 2.1x2.2 mm
    • Small Solution Footprint, QFN 4x4 mm
    • Low BOM cost
  • Integrated Digital Front End with SPI
    • 64 samples Internal FIFO Interface
    • 1.8 V to 5.0 V Digital I/O Supply
  • Piezo Force Sensing
  • Fast Start Up Time, < 300 µs
  • Unidirectional Power Input option
  • Wide Supply Voltage Range, 3 to 5.5 V
CapDrive Technology
CapDrive® Ultra-Low Power Piezo Driver (BOS1901)
CapDrive® Ultra-Low Power Piezo Driver (BOS1901)
CapDrive® Ultra-Low Power Piezo Driver (BOS1901)

Product Description

The BOS1901 is a single-chip piezo actuator driver with energy recovery, based on our patented CapDrive™ technology. It can drive actuators with up to 190 Vpk-pk waveforms while operating from a 3-5.5 V supply voltage. The input digital stream is written in the internal FIFO over the digital interface to generate the desired output waveform. Low power and small size make it suitable in a variety of applications where power consumption and heat dissipation must be minimized.

The BOS1901 uses a high-speed SPI in its Digital Front End. It enables the device to share a common communication bus for multi-actuator systems and the user to query various data such as the actuator voltage for sensing applications.

The differential driver achieves low distortion waveforms and quiet actuator operation. All settings are adjustable through the digital front end to reduce the BOM. Only 7 passive discrete components are required. The BOS1901 can be operated with a wide selection of commercial off-the-shelf inductors.

In systems that can’t handle reverse current flow in the power delivery network, the BOS1901 features a unidirectional power input (UPI). When the UPI mode is activated, the driver behaves as a resistive load without reducing power efficiency.

Typical start-up time of less than 300 µs makes the BOS1901 latency insignificant in most systems. Safety systems protect the device from damage in case of a fault.

Parametric Specifications

Description BOS1901
Supply Voltage Min 3.0 V
Supply Voltage Max 5.5 V
I/O Supply Voltage Min 1.62 V
I/O Supply Voltage Max 5.5 V
Full-Scale Output Voltage 190 Vpp
Quiescent Current (Sleep) 1 µA
Total Harmonic Distortion + Noise 0.5 %

BOS1901 Technical Documentation

Document Name Type Size Release Date
BOS1901 - Datasheet (English) PDFDatasheet 1.55 MB 2022-03-16
BOS1901 - Product Brief (English) PDFProduct Brief 242 KB 2019-04-23
BOS1901 - Product Brief (German)(auf Deutsch) PDFProduct Brief 250 KB 2019-04-23
BOS1901 - Product Brief (Korean)(한국어) PDFProduct Brief 290 KB 2019-04-23
BOS1901 - Product Brief (Japanese)(日本語) PDFProduct Brief 302 KB 2019-04-23
BOS1901 - Product Brief (Chinese)(简体中文) PDFProduct Brief 337 KB 2019-04-23
BOS1901 - Probing BOS1901 with an Oscilloscope PDFApplication Note 412 KB 2019-09-18
BOS1901 – Sensing Piezoelectric Actuator Force using BOS1901 PDFApplication Note 459 KB 2019-11-25
BOS1901 – Driving Piezoelectric Actuator using BOS1901 PDFApplication Note 580 KB 2020-03-11
BOS1901 – Oscillator Trimming PDFApplication Note 437 KB 2020-03-11
BOS1901 - Component Selection for BOS1901 PDFApplication Note 1,008 KB 2021-12-09

Quality & Environment

Document Name Type Size Release Date
Boréas Technologies RoHS Statement PDF 132 KB 2022-04-07

Design & Development

Name Image Type Buy Now
BOS01901-KIT Dev-Kit Evaluation Board Buy Now

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