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110VPK-PK High-Efficiency Piezo Haptic Actuator Boost Driver

Lowest Power Piezo Haptic Actuator Driver

Product Details

The MAX77501 is a high-efficiency controller driver for piezo haptic actuators and is optimized for driving up to 2µF piezo elements. It can generate a single-ended haptic waveform of up to 110VPK-PK amplitude from a 2.8V to 5.5V input power supply or a single cell Li+ battery. Memory playback and haptic waveforms real-time streaming modes are supported.

A 25MHz SPI interface provides full system access and control, including fault reporting and monitoring. This allows for a rapid 600µs playback start-up time from shutdown. The on-board memory can be dynamically allocated as multiple waveforms storage or as a FIFO buffer. The IC also implements an ultra-low power boost architecture providing the lowest power consumption solution for a haptic actuator driver.

Built-in undervoltage lockout (UVLO), cycle-by-cycle overcurrent limit, overvoltage and thermal shutdown protections ensure safe operation under abnormal operating conditions.

The MAX77501 is available in a 30-bump, 0.4mm pitch, wafer-level package (WLP).

Design Solution: Piezo Haptic Driver Extends Portables’ Battery Life ›

Key Features

  • 110VPK-PK Haptic Waveforms Generation
  • Optimized for up to 2µF Haptic Piezo Actuator
  • 2.8V to 5.5V Input Supply Range
  • 600μs Start-Up Time to Haptic Playback
  • High-Efficiency, Low IQ Extends Battery Life
    • 75μA Standby Current/1μA Shutdown Current
    • Maxim Patented Ultra-Low Power Boost Architecture
  • 12-Bit Haptic Waveform Playback DAC
  • Real-Time Streaming and RAM Playback Modes
    • 9k FIFO Buffer with FIFO Ready Status Signal
    • 8k RAM Buffer for Waveforms Storage
  • 25MHz SPI Interface
    • SPI Ready, Warning and Fault Conditions Interrupt
  • Protection Features
    • Programmable Cycle-by-Cycle Overcurrent Limit, 130V Overvoltage, UVLO, and Thermal Protections
  • Small Size and Low Profile
    • 2.45mm x 2.05mm, 30 Bump WLP

Applications/Uses

  • Smartphones, Tablets/E-readers, Game Consoles
  • Keyboard, Mice, Remote Controls, and Peripherals
  • Haptic/Tactile Feedback Enabled Equipment
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.8
VIN (V) (max) 5.5
VOUT1 (V) (min) 1
VOUT1 (V) (max) 100
Switch Type External
Output Adjust. Method Voltage
Synchronous Switching? Yes
ICC (mA) (typ) 0.075
Shutdown Mode Supply Current (µA) (typ) 0.1
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins WLP/30
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Simplified Block Diagram

MAX77501: Simplified Application Circuit MAX77501: Simplified Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX77501 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77501 piezo driver. The EV kit allows for easy evaluation of the MAX77501 and its ability to drive a large haptic signal through a ceramic piezo actuator.

The MAX77501 is a boost controller that drives the gates of a pair of low-side and high-side MOSFETs to step up an input haptic signal to a level suitable for piezo haptics. It includes all necessary external components to operate the IC. The MAX77501 takes digital input signals in one of two forms: data stored on internal RAM or fed through the internal FIFO (First-In, First-Out) system. The EV kit supports both formats of input. Windows-based GUI software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77501.

View Details

Features

  • Easy to Use
    • GUI Drives SPI Interface
    • Access to the Digital Engine through Software GUI
    • Assembled and Fully Tested
  • Selectable Headers for Quick Testing of Different Output Capacitors (J7 for 330nF, J9 for 680nF, or J5 for 1µF)
  • Buffer-Configured Operational Amplifier Attached to Feedback of Converter for Measuring a Scaled-Down Version of the Output Voltage or the Output of the DAC
  • Test Points to Measure All Outputs of the Boost Converter and Charge Pumps

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Key Features

  • 110VPK-PK Haptic Waveforms Generation
  • Optimized for up to 2µF Haptic Piezo Actuator
  • 2.8V to 5.5V Input Supply Range
  • 600μs Start-Up Time to Haptic Playback
  • High-Efficiency, Low IQ Extends Battery Life
    • 75μA Standby Current/1μA Shutdown Current
    • Maxim Patented Ultra-Low Power Boost Architecture
  • 12-Bit Haptic Waveform Playback DAC
  • Real-Time Streaming and RAM Playback Modes
    • 9k FIFO Buffer with FIFO Ready Status Signal
    • 8k RAM Buffer for Waveforms Storage
  • 25MHz SPI Interface
    • SPI Ready, Warning and Fault Conditions Interrupt
  • Protection Features
    • Programmable Cycle-by-Cycle Overcurrent Limit, 130V Overvoltage, UVLO, and Thermal Protections
  • Small Size and Low Profile
    • 2.45mm x 2.05mm, 30 Bump WLP

Applications/Uses

  • Smartphones, Tablets/E-readers, Game Consoles
  • Keyboard, Mice, Remote Controls, and Peripherals
  • Haptic/Tactile Feedback Enabled Equipment

Description

The MAX77501 is a high-efficiency controller driver for piezo haptic actuators and is optimized for driving up to 2µF piezo elements. It can generate a single-ended haptic waveform of up to 110VPK-PK amplitude from a 2.8V to 5.5V input power supply or a single cell Li+ battery. Memory playback and haptic waveforms real-time streaming modes are supported.

A 25MHz SPI interface provides full system access and control, including fault reporting and monitoring. This allows for a rapid 600µs playback start-up time from shutdown. The on-board memory can be dynamically allocated as multiple waveforms storage or as a FIFO buffer. The IC also implements an ultra-low power boost architecture providing the lowest power consumption solution for a haptic actuator driver.

Built-in undervoltage lockout (UVLO), cycle-by-cycle overcurrent limit, overvoltage and thermal shutdown protections ensure safe operation under abnormal operating conditions.

The MAX77501 is available in a 30-bump, 0.4mm pitch, wafer-level package (WLP).

Design Solution: Piezo Haptic Driver Extends Portables’ Battery Life ›

Simplified Block Diagram

MAX77501: Simplified Application Circuit MAX77501: Simplified Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal