MAX98306

19-5919; Rev 0; 6/11 TION KIT EVALUA BLE ILA AVA Stereo 3.7W Class D Amplifier Features S Output Power 3.7W at 3I, 10% THD, 1.7W at 8I, 10% THD, with 5V Supply S Passes EMI Limit Unfiltered with Up to 12in of Speaker Cable S High 83dB PSRR at 217Hz S Spread-Spectrum Modulation and Active Emissions Limiting S Five Pin-Selectable Gains S Excellent Click-and-Pop Suppression S Thermal and Overcurrent Protection S Low-Current Shutdown Mode S Space-Saving, 3mm x 3mm x 0.75mm, 14-Pin TDFN General Description The MAX98306 stereo 3.7W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (6dB, 9dB, 12dB, 15dB, and 18dB) set by a single gain-select input (GAIN). Active emissions limiting, edge-rate, and overshoot control circuitry combined with a filterless spread-spectrum modulation scheme (SSM) provide excellent EMI performance while eliminating the need for output filtering found in traditional Class D devices. These features reduce application component count. The IC's 2.0mA quiescent current with a 3.7V supply extends battery life in portable applications. The IC is available in a 14-pin TDFN (3mm x 3mm x 0.75mm) package specified over the extended -40NC to +85NC temperature range. MAX98306 Applications Smartphones Tablets Cellular Phones Accessory Speakers MP3 Players Portable Audio Players VoIP Phones PART MAX98306ETD+ Ordering Information TEMP RANGE -40NC to +85NC PINPACKAGE 14 TDFN TOP MARK +AEV +Denotes a lead(Pb)-free/RoHS-compliant package. Typical Application Circuit +2.6V TO +5.5V 0.1µF 10µF 1µF INL+ PVDD OUTL+ 1µF INL- OUTL- PVDD GAIN GAIN CONTROL 1µF INR+ OUTR+ 1µF INR- OUTR- PVDD SHDN MAX98306 PGND _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Stereo 3.7W Class D Amplifier MAX98306 ABSOLUTE MAXIMUM RATINGS Voltage PVDD to PGND .................................................... -0.3V to +6V OUTL+, OUTR+, OUTL-, OUTRto PGND ........................................... -0.3V to (VPVDD + 0.3V) All Other Pins to PGND ....................................... -0.3V to +6V Current Continuous Current Into/Out of PVDD, PGND, OUTL+, OUTR+, OUTL-, OUTR- .............................. ±800mA Continuous Input Current (all other pins) .................... ±20mA Duration of Short Circuit OUTL+, OUTR+, OUTL-, OUTR- to PGND or PVDD .... Continuous OUTL+ to OUTL- or OUTR+ to OUTR-................... Continuous Continuous Power Dissipation for a MultiLayer Board (TA = +70°C) TDFN (deration 24.4mW/°C above +70°C) ............... 1951.2mW Junction Temperature ....................................................+150°C Operating Temperature Range ......................... -40°C to +85°C Storage Temperature Range .......................... -65°C to +150°C Lead Temperature (10s, soldering) ...............................+300°C Soldering Temperature (reflow) ......................................+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 1) Junction-to-Ambient Thermal Resistance (qJA) .............. 41°C/W Junction-to-Case Thermal Resistance (qJA) ..................... 8°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER GENERAL Supply Voltage Range Undervoltage Lockout Quiescent Supply Current Shutdown Supply Current Turn On Time Bias Voltage VPVDD UVLO IPVDD ISHDN tON VBIAS GAIN = PGND GAIN = 100kI to PGND Voltage Gain AV GAIN = PVDD GAIN = 100kI to PVDD GAIN = unconnected Channel-to-Channel Gain Tracking AV = 18dB (GAIN = PGND) AV = 15Db (GAIN = 100kI to PGND) Input Resistance RIN AV = 12dB (GAIN = PVDD) AV = 9dB (GAIN = 100kI to PVDD) AV = 6dB (GAIN = unconnected) Common-Mode Rejection Ratio Output Offset Voltage 2 CMRR VOS fIN = 1kHz, input referred TA = +25NC (Note 3) 22 31 44 62 89 VPVDD = 3.7V VPVDD = 5.0V VSHDN = 0, TA = +25NC 1.62 17.5 14.5 11.5 8.5 5.5 Guaranteed by PSRR test 2.6 1.8 2 2.6 10FH. Typical 8I speakers exhibit series inductances in the 20FH to 100FH range. Filterless Class D Operation Table 2. Capacitance Value for 20Hz Highpass Filter GAIN 18 15 12 9 6 RIN (kI) 33 46 65 93 131 CIN for 20Hz (nF) 241 173 122 86 61 Component Selection Power-Supply Input (PVDD) PVDD powers the speaker amplifier. PVDD ranges from 2.6V to 5.5V. Bypass PVDD with 0.1FF and 10FF capacitors to PGND. Apply additional bulk capacitance at the device if long input traces between PVDD and the power source are used. Input Filtering The input-coupling capacitor (CIN), in conjunction with the amplifier’s internal input resistance (RIN), forms a highpass filter that removes the DC bias from the incoming signal. These capacitors allow the amplifier to bias the signal to an optimum DC level. Assuming zero source impedance, CIN is: CIN = 1 2π f −3dB × RIN Proper layout and grounding are essential for optimum performance. Good grounding improves audio performance and prevents switching noise from coupling into the audio signal. Layout and Grounding Use wide, low-resistance output traces. As the load impedance decreases, the current drawn from the device increases. At higher current, the resistance of the output traces decrease the power delivered to the load. For example, if 2W is delivered from the device output to a 4I load through 100mI of total speaker trace, 1.904W is delivered to the speaker. If power is delivered through 10mI of total speaker trace, 1.99W is delivered to the speaker. Wide output, supply, and ground traces also improve the power dissipation of the device. The IC is inherently designed for excellent RF immunity. For best performance, add ground fills around all signal traces on top or bottom PCB planes. where f-3dB is the -3dB corner frequency and RIN is the typical value as specified in the Electrical Characteristics table. Use capacitors with adequately low-voltage coefficients for best low-frequency THD performance. Table 2 shows calculated capacitance values based on a 20Hz highpass filter. Chip Information PROCESS: CMOS 10 _____________________________________________________________________________________ Stereo 3.7W Class D Amplifier Block Diagram 2.6V TO 5.5V MAX98306 0.1µF PVDD 11, 12 PVDD SHDN 2 UVLO/POWER MANAGEMENT 10µF PVDD CLICK-AND-POP SUPPRESSION LOW-EMI DRIVER INL+ 3 INL- 4 MODULATOR (FIXED GAIN 2x) PGND PVDD 13 OUTL+ LOW-EMI DRIVER 1ST INTEGRATOR 2ND INTEGRATOR PGND 14 OUTL- PVDD GAIN 5 GAIN CONTROL GAIN SELECTION MAX98306 1ST INTEGRATOR 2ND INTEGRATOR PVDD GAIN SELECTION LOW-EMI DRIVER INR+ 7 INR- 6 MODULATOR (FIXED GAIN 2x) PGND PVDD 10 OUTR+ LOW-EMI DRIVER 9 OUTR- PGND 1, 8 PGND ______________________________________________________________________________________ 11 Stereo 3.7W Class D Amplifier MAX98306 Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 14 TDFN PACKAGE CODE T1433+2 OUTLINE NO. 21-0137 LAND PATTERN NO. 90-0063 COMMON DIMENSIONS SYMBOL A D E L k A2 MIN. 0.70 2.90 2.90 MAX. 0.80 3.10 3.10 PACKAGE VARIATIONS PKG. CODE T633-2 T833-2 T833-3 N 6 8 8 D2 1.50±0.10 1.50±0.10 1.50±0.10 E2 2.30±0.10 2.30±0.10 2.30±0.10 e 0.95 BSC 0.65 BSC 0.65 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEEC b 0.40±0.05 0.30±0.05 0.30±0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 1.95 REF 12 _____________________________________________________________________________________ 2.00 REF T1033-1 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 A1 0.00 0.05 0.20 0.40 T1033MK-1 T1033-2 T1433-1 10 10 14 1.50±0.10 1.50±0.10 1.70±0.10 2.30±0.10 2.30±0.10 2.30±0.10 0.50 BSC 0.50 BSC 0.40 BSC MO229 / WEED-3 MO229 / WEED-3 ---- 0.25±0.05 0.25±0.05 0.20±0.05 2.00 REF 2.00 REF 2.40 REF 0.25 MIN. 0.20 REF. Stereo 3.7W Class D Amplifier Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. MAX98306 COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40 PACKAGE VARIATIONS PKG. CODE T633-2 T833-2 T833-3 T1033-1 T1033MK-1 T1033-2 T1433-1 N 6 8 8 10 10 10 14 14 14 D2 1.50±0.10 1.50±0.10 1.50±0.10 1.50±0.10 1.50±0.10 1.50±0.10 1.70±0.10 1.70±0.10 1.70±0.10 E2 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 2.30±0.10 e 0.95 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 MO229 / WEED-3 ---------- b 0.40±0.05 0.30±0.05 0.30±0.05 0.25±0.05 0.25±0.05 0.25±0.05 0.20±0.05 0.20±0.05 0.20±0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF 2.40 REF 0.25 MIN. 0.20 REF. T1433-2 T1433-3F ______________________________________________________________________________________ 13 Stereo 3.7W Class D Amplifier MAX98306 Revision History REVISION NUMBER 0 REVISION DATE 6/11 Initial release DESCRIPTION PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 © Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.