DRV8662 SLOS737 – JUNE 2011 www.ti.com Piezo Haptic Driver with Integrated Boost Converter Check for Samples: DRV8662 FEATURES DESCRIPTION • The DRV8662 is a single-chip piezo haptic driver with integrated 105 V boost switch, integrated power diode, and integrated fully-differential amplifier. This versatile device is capable of driving both high-voltage and low-voltage piezo haptic actuators. The input signal can be either differential or single-ended. The DRV8662 supports four GPIO-controlled gains: 28.8 dB, 34.8 dB, 38.4 dB, and 40.7 dB. 1 • • • • • • High-Voltage Piezo Haptic Driver – Drives up to 100 nF at 200 VPP and 300 Hz – Drives up to 330 nF at 100 VPP and 300 Hz – Drives up to 680 nF at 50 VPP and 300 Hz – Differential Output Integrated Boost Converter – Adjustable Boost Voltage – Adjustable Current Limit – Integrated Power FET and Diode – No Transformer Required Fast Start Up Time of 1.5 ms Wide Supply Voltage Range of 3.0 V to 5.5 V 1.8 V Compatible Digital Pins Thermal Protection Available in a 4 mm × 4 mm × 0.9 mm QFN package (RGP) The boost voltage is set using two external resistors, and the boost current limit is programmable via the REXT resistor. The boost converter architecture will not allow the demand on the supply current to exceed the limit set by the REXT resistor; therefore, the DRV8662 is well-suited for portable applications. This feature also allows the user to optimize the DRV8662 circuit for a given inductor based on the desired performance requirements. A typical start-up time of 1.5 ms makes the DRV8662 an ideal piezo driver for fast haptic responses. Thermal overload protection prevents the device from being damaged when overdriven. APPLICATIONS • • • • Mobile Phones Portable Gaming Portable Navigation Devices Tablet Devices __ __ VBAT L1 CBOOST Boost Converter CPUMP R1 REXT DRV8662 R2 IN+ Gain IN- + – Piezo Actuator EN GAIN0 GAIN1 For more information, please contact your local TI sales representative. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. 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