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The MAX11835 haptic (tactile) piezo controller provides a complete solution to drive ceramic piezo actuators to create haptic feedback for products featuring user touch interfaces. The MAX11835 can drive single-layer or multilayer piezo actuators over a wide range of voltages up to 250V. It efficiently generates any type of userprogrammable waveforms including sine, trapezoidal, square, and pulse to drive the piezo loads to create custom haptic sensations. The low-power MAX11835 directly interfaces with an application processor/host controller through a standard serial interface and integrates various blocks including a boost regulator, pattern storage memory, and waveform generator block in one package, thus providing a complete piezo driver solution.

The MAX11835 contains a boost regulator that uses an external flyback to efficiently generate high-voltage waveforms up to 250V to drive piezo actuators while limiting current drain. The boost regulator features an internal n-channel MOSFET to set current limit and control the drain from the battery or power supply.

The MAX11835 features user-programmable touch feedback pattern storage memory that drives the waveform generator with piecewise linear data using 8-bit resolution. The device also offers a trigger feature that makes it possible to use multiple haptic piezo controllers in parallel to provide haptic sensations for larger displays. Its smart, low-power, and standby modes reduce power consumption before, during, and after waveform generation. The MAX11835 goes into low-power mode after a haptic event to save power automatically.

The MAX11835 offers a fast 400kHz, I2C serial interface to allow programming of various modes of operation, status checking, and haptic waveforms. The operating supply range includes 1.7V to 3.6V for digital supply and 2.7V to 5.25V for V_BATT and AVDD.

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Drives Single-Layer Piezo or Multilayer Actuators with Waveform Peak Voltages up to 250V

Creates Custom User-Programmable Waveforms with Up to 8-Bit Resolution

Automatic Haptics Creation Without the Need for Application Processor Intervention

Audio Input Mode

On-Chip DC Boost Regulator

• On-Chip 33V High-Voltage Boost Switch with Programmable Maximum Peak Current
• Flyback Converter Generates Piezo High-Voltage Supply
• Undervoltage Lockout Feature
• Efficient Design to Minimize Drain on Battery Applications

On-Chip Multiple Haptic Waveform Storage Up to 192 Bytes

TRIGb to Optionally Start a Preprogrammed Waveform

DISb to Disable or Enter Lower Power Boost Operation During a PA Burst

1.7V to 3.6V Digital Supply

Boost/Flyback and 2.7V to 5.25V Analog Power Supply (V_BATT)

Programmable Low-Power Modes

• 1μA Deep Sleep Shutdown Current

Thermal Shutdown

Available in a 400kHz I2C Serial Interface

ESD Protection: ±1kV HBM, ±1kV CDM, ±200V MM

Lead(Pb)-Free/RoHS-Compliant Package (0.4mm Pitch)