110V High-Efficiency Piezo Haptic Actuator Boost Driver

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 ›

Applications

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

* 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