DRV8662_12 Datasheet, PDF (1/4 Pages) Texas Instruments – Piezo Haptic Driver with Integrated Boost Converter

DRV8662
www.ti.com
SLOS737A – JUNE 2011 – REVISED MARCH 2012
Piezo Haptic Driver with Integrated Boost Converter
Check for Samples: DRV8662
FEATURES
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• High-Voltage Piezo Haptic Driver
– Drives up to 100 nF at 200 V_PP and 300 Hz
– Drives up to 150 nF at 150 V_PP and 300 Hz
– Drives up to 330 nF at 100 V_PP and 300 Hz
– Drives up to 680 nF at 50 V_PP 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
• 1.8V Compatible Digital Pins
• Thermal Protection
• Available in a 4 mm × 4 mm × 0.9 mm QFN
package (RGP)
APPLICATIONS
• Mobile Phones
• Tablets
• Portable Computers
• Keyboards and Mice
• Touch Enabled Devices
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.
The boost voltage is set using two external resistors,
and the boost current limit is programmable via the
R_EXT resistor. The boost converter architecture will
not allow the demand on the supply current to exceed
the limit set by the R_EXT 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.
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VBAT
L1
CPUMP
REXT
IN+
IN-
EN
GAIN0
GAIN1
Boost
Converter
DRV8662
+
Gain
–
CBOOST
R1
R2
Piezo
Actuator
For more information, please contact your local TI sales representative.
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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. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2012, Texas Instruments Incorporated