BOS1901 Piezo Haptic Driver
BOS1901 Piezo Haptic Driver

BOS1901 Piezo Haptic Driver

QFN 20L 4x4x0.8 0.5P

Regular price $5.63 USD

Minimum Order : 20 Units

Maximum Order : 99 Units

Please contact us if you want to order more units.

The BOS1901 is a single-chip piezo actuator driver with energy recovery, based on a patent pending CapDrive™ technology. It can drive actuators with up to 190 Vpk-pkwaveforms 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.


Mobile Phones and Tablets haptics

Smartphones and Tablets

Portable Computers haptics

Laptop Computers

Keyboards and Mice haptics

Keyboards and Mice

Electronic Gaming haptics

Electronic Gaming

Wearables haptics


Electronic Cooling

Cooling Fans


  • 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
    • Small Solution Footprint, QFN4x4mm
    • 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 Sensing
  • Fast Start Up Time, < 300 µs
  • Unidirectional Power Input option
  • Wide Supply Voltage Range, 3 to 5.5 V


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 %

Technical Documents

  • BOS1901 datasheet download BOS1901 - Datasheet (English) Download
  • bos1901 german product brief download BOS1901 - Product Brief (English) Download
  • bos1901 german product brief download BOS1901 - Product Brief (German)(auf Deutsch) Download
  • bos1901 korean product brief download BOS1901 - Product Brief (Korean)(한국어) Download
  • bos1901 japanese product brief download BOS1901 - Product Brief (Japanese)(日本語)Download
  • bos1901 chinese product brief download BOS1901 - Product Brief (Chinese)(简体中文) Download

Development Kit

Test our Technology

Learn More on BOS1901 Development Kit