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VBAT

–

Boost

Converter

Gain

BOOST

IN+

IN-

GAIN0

GAIN1

DRV8662

PUMP

Actuator

EXT

Piezo

DRV8662

www.ti.com

SLOS709A –JUNE 2011–REVISED NOVEMBER 2012

Piezo Haptic Driver with Integrated Boost Converter

Check for Samples: DRV8662

FEATURES

DESCRIPTION

The DRV8662 is a single-chip piezo haptic driver with

• High-Voltage Piezo Haptic Driver

integrated 105 V boost switch, integrated power

– Drives up to 100 nF at 200 V

and 300 Hz

diode, and integrated fully-differential amplifier. This

– Drives up to 150 nF at 150 V

and 300 Hz

versatile device is capable of driving both high-

voltage and low-voltage piezo haptic actuators. The

– Drives up to 330 nF at 100 V

and 300 Hz

input signal can be either differential or single-ended.

– Drives up to 680 nF at 50 V

and 300 Hz

The DRV8662 supports four GPIO-controlled gains:

– Differential Output

28.8 dB, 34.8 dB, 38.4 dB, and 40.7 dB.

• Integrated Boost Converter

The boost voltage is set using two external resistors,

– Adjustable Boost Voltage

and the boost current limit is programmable via the

EXT

resistor. The boost converter architecture will

– Adjustable Current Limit

not allow the demand on the supply current to exceed

– Integrated Power FET and Diode

the limit set by the R

EXT

resistor; therefore, the

– No Transformer Required

DRV8662 is well-suited for portable applications. This

feature also allows the user to optimize the DRV8662

• Fast Start Up Time of 1.5 ms

circuit for a given inductor based on the desired

• Wide Supply Voltage Range of 3.0 V to 5.5 V

performance requirements.

• 1.8V Compatible Digital Pins

A typical start-up time of 1.5 ms makes the DRV8662

• Thermal Protection

an ideal piezo driver for fast haptic responses.

• Available in a 4 mm × 4 mm × 0.9 mm QFN

Thermal overload protection prevents the device from

package (RGP)

being damaged when overdriven.

APPLICATIONS

• Mobile Phones

• Tablets

• Portable Computers

• Keyboards and Mice

• Touch Enabled Devices

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.

Summary of content (19 pages)

PAGE 1
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 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 highvoltage and low-voltage piezo haptic actuators. The input signal can be either differential or single-ended.
PAGE 2
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION QFN (RGP) 4mm x 4 mm x 0.
PAGE 3
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 ABSOLUTE MAXIMUM RATINGS (1) Over operating free-air temperature range (unless otherwise noted) VI Supply voltage VDD Input voltage IN+, IN-, EN, GAIN0, GAIN1, FB Boost/Output Voltage PVDD, SW, OUT+, OUT- VALUE UNIT –0.3 to 6.0 V –0.3 to VDD + 0.
PAGE 4
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com spacer ELECTRICAL CHARACTERISTICS TA = 25°C, VO,PP = VOUT+ – VOUT– = 200 V, CL = 47 nF, AV = 40 dB, L = 4.7 µH (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT |IIL| Digital input low current EN, GAIN0, GAIN1 VDD = 3.6 V, VIN = 0 V |IIH| Digital input high current EN, GAIN0, GAIN1 VDD = 3.6 V, VIN = VDD ISD Shut down current VDD = 3.6 V, VEN = 0 V 13 µA VDD = 3.
PAGE 5
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 TYPICAL CHARACTERISTICS VDD = 3.6 V, REXT = 7.5 kΩ, L = 4.7 µH, Differential Input Supply Current vs. Output Voltage Supply Current vs. Output Voltage 600m 600m Frequency = 200 Hz CLOAD = 47 nF PVDD = 105 V Gain = 40 dB 500m IDD − Supply Current − A IDD − Supply Current − A 500m VDD = 3.0 V VDD = 3.6 V VDD = 5.
PAGE 6
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) VDD = 3.6 V, REXT = 7.5 kΩ, L = 4.7 µH, Differential Input Typical Waveform 160 10 Frequency = 200 Hz CLOAD = 47 nF PVDD = 105 V Gain = 40 dB VDD = 3.0 V VDD = 3.6 V VDD = 5.0 V VDD = 3.6 V CLOAD = 47 nF VOUT = 200 VPP 140 120 OUT+ OUT− VBST 100 Voltage − V THD+N − Total Harmonic Distortion + Noise − % Total Harmonic Distortion + Noise vs. Output Voltage 1 80 60 40 20 0 −20 −40 −10m 0.
PAGE 7
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 DETAILED DESCRIPTION OPERATION The DRV8662 accepts the typical battery range used in portable applications (3.0 V to 5.5 V) and creates a boosted supply rail with an integrated DC-DC converter. This boosted supply rail is fed to an internal, highvoltage, fully-differential amplifier that is capable of driving capacitive loads such as piezos with signals up to 200 VPP. No transformer is required for boost operation.
PAGE 8
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com THERMAL SHUTDOWN The DRV8662 contains an internal temperature sensor that will shut down both the boost converter and the amplifier when the temperature threshold is exceeded. When the die temperature falls below the threshold, the device will restart operation automatically as long as the EN pin is high. Continuous operation of the DRV8662 is not recommended. Most haptic use models only operate the DRV8662 in short bursts.
PAGE 9
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 APPLICATION INFORMATION PROGRAMMING THE BOOST VOLTAGE The boost output voltage (VBST) is programmed via two external resistors as shown in the diagram below. VBST DRV8662 R1 FB R2 The boost output voltage is given by Equation 1 VBOOST = VFB 1 + R1 R2 (1) where VFB = 1.32 V. VBST should be programmed to a value 5.0 V greater than the largest peak voltage expected in the system to allow adequate amplifier headroom.
PAGE 10
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com PIEZO ACTUATOR SELECTION There are several key specifications to consider when choosing a piezo actuator for haptics such as dimensions, blocking force, and displacement. However, the key electrical specifications from the driver perspective are voltage rating and capacitance. At the maximum frequency of 500 Hz, the DRV8662 is optimized to drive up to 50 nF at 200 VPP, which is the highest voltage swing capability.
PAGE 11
DRV8662 www.ti.com SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 CURRENT CONSUMPTION CALCULATION It is useful to understand how the voltage driven onto a piezo actuator relates to the current consumption from the power supply. Modeling a piezo element as a pure capacitor is reasonably accurate.
PAGE 12
DRV8662 SLOS709A – JUNE 2011 – REVISED NOVEMBER 2012 www.ti.com SYSTEM DIAGRAMS L VBAT 3.0 V - 5.5 V C2 C1 VDD SW VBST PVDD R1 EN Digital Control FB GAIN1 R2 GAIN0 VPUMP C3 DRV8662 REXT R3 C4 DAC IN+ OUT+ IN- OUT- Piezo Actuator C5 GND Figure 13. DRV8662 System Diagram with DAC Input L VBAT 3.0 V - 5.5 V C2 C1 VDD SW VBST PVDD R1 EN Digital Control FB GAIN1 R2 GAIN0 VPUMP C3 DRV8662 REXT R3 C4 R4 Processor IN+ OUT+ IN- OUT- Piezo Actuator C5 C6 GND Figure 14.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 28-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DRV8662RGPR QFN RGP 20 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 DRV8662RGPT QFN RGP 20 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 28-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DRV8662RGPR QFN RGP 20 3000 367.0 367.0 35.0 DRV8662RGPT QFN RGP 20 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.