TI1 DRV8662 Piezo haptic driver with integrated boost converter Datasheet

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
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