MAX98314

19-6124; Rev 0; 11/11 EVALUATION KIT AVAILABLE MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors General Description The MAX98314 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN). Active emissions limiting (AEL) edge rate and overshoot control circuitry and a filterless spread-spectrum modulation (SSM) scheme greatly reduce EMI and eliminate the need for output filtering found in traditional Class D devices. The IC’s low 0.95mA at 3.7V, 1.2mA at 5.0V quiescent current extends battery life in portable applications. Highly linear, integrated input coupling capacitors (CIN) reduce solution size and provide excellent THD+N, PSRR, and CMRR performance at low frequencies vs. standard Class D amplifiers using external input capacitors. The IC is available in a small 9-bump, 0.3mm pitch WLP (1.0mm x 1.0mm x 0.80mm) package and is specified over the -40NC to +85NC extended temperature range. Features S Integrated Input Coupling Capacitors with Excellent Linearity  fC = 100Hz (6dB)  fC = 200Hz (12dB) S Low Quiescent Current  0.95mA at 3.7V  1.2mA at 5.0V S Delivers High Output Power at 10% THD+N  3.2W into 4I, VPVDD = 5V  960mW into 8I, VPVDD = 3.7V S Ultra-Low Noise: 19µV S Eliminates Output Filtering Requirement  Spread Spectrum and Active Emissions Limiting S Click-and-Pop Suppression S Thermal and Overcurrent Protection S Low Current Shutdown Mode S Small, Space-Saving Package Applications Mobile Phones Portable Audio Notebook Computers MP3 Players Netbook Computers VoIP Phones CIN CIN Simplified Block Diagram MAX98314 CLASS D MODULATOR AND H-BRIDGE Ordering Information appears at end of data sheet. GAIN CONTROL For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX98314.related ����������������������������������������������������������������� 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. MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Functional Diagram/Typical Application Circuit 2.5V TO 5.5V 0.1µF PVDD A3 SHDN C1 UVLO/POWER MANAGEMENT CLICK-AND-POP SUPPRESSION 10µF* MAX98314 PVDD GAIN B3 C3 CLASS D MODULATOR LOW-EMI DRIVER A1 OUT- IN+ PGND PVDD IN- C2 LOW-EMI DRIVER A2 OUT+ PGND B1 PGND *SYSTEM BULK CAPACITANCE. ����������������������������������������������������������������� Maxim Integrated Products 2 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors ABSOLUTE MAXIMUM RATINGS PVDD, IN+, IN-, SHDN, GAIN to PGND................... 0.3V to +6V OUT+, OUT- to PGND ............................ 0.3V to (VPVDD + 0.3V) Continuous Current In/Out of PVDD, PGND, OUT_ .........750mA Continuous Input Current (all other pins) ........................ Q20mA Duration of Short Circuit Between OUT_ to PVDD, PGND .......................................... Continuous Between OUT+ and OUT- Pins ............................. Continuous Continuous Power Dissipation (TA = +70NC) for Multilayer Board WLP (derate 10.64mW/NC above +70NC) ..................... 851mW Junction Temperature .....................................................+150NC Operating Temperature Range .......................... -40NC to +85NC Storage Temperature Range............................ -65NC to +150NC Soldering Temperature (reflow) ......................................+260NC 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) WLP Junction-to-Ambient Thermal Resistance (BJA) ........ 102NC/W Junction-to-Case Thermal Resistance (BJC) ............... 47NC/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 = VGAIN = 5V, VPGND = 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2, 3) PARAMETER AMPLIFIER CHARACTERISTICS Supply Voltage Range Undervoltage Lockout Quiescent Current Shutdown Supply Current Turn-On Time Bias Voltage VPVDD UVLO IPVDD ISHDN tON VBIAS GAIN connected to PGND GAIN connected to PGND through 100kI Q5% resistor Voltage Gain AV f = 1kHz GAIN connected to PVDD GAIN connected to PVDD through 100kI Q5% resistor GAIN unconnected Input Capacitance CIN All gains AV = 12dB AV = 9dB Highpass Corner Frequency fC -3dB down AV = 6dB AV = 3dB AV = 0dB 63 11.75 8.75 5.75 2.75 -0.25 Guaranteed by PSRR test PVDD falling VPVDD = 5V VPVDD = 3.7V VSHDN = 0V, TA = +25NC 2.5 1.8 1.2 0.95 < 0.1 3.7 VPVDD/2 12 9 6 3 0 0.011 199 139 100 70 50 189 Hz 12.25 9.25 6.25 3.25 +0.25 FF dB 10 10 5.5 2.2 1.8 V V mA FA ms V SYMBOL CONDITIONS MIN TYP MAX UNITS ����������������������������������������������������������������� Maxim Integrated Products 3 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSHDN = VGAIN = 5V, VPGND = 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2, 3) PARAMETER Common-Mode Rejection Ratio Output Offset Voltage SYMBOL CMRR VOS CONDITIONS fIN = 1kHz, input referred TA = +25NC (Note 4) RL = 8I + 68FH, peak voltage, TA = +25NC, A-weighted, 32 samples per second, TA = +25NC (Notes 4, 5) Into shutdown MIN TYP 67 Q1 -59 dBV Out of shutdown 70 -82 90 74 72 49 3.2 2.2 1.7 2.6 1.8 1.4 1.8 1.2 0.96 1.4 1 0.8 0.03 0.03 31 26 23 21 19 93 300 20 2.8 155 % kHz kHz A NC FVRMS 0.1 % W dB Q3 MAX UNITS dB mV Click-and-Pop Level KCP Power-Supply Rejection Ratio (Note 4) PSRR VPVDD = 2.5V to 5.5V, TA = +25NC f = 217Hz VRIPPLE = 200mVP-P THD+N = 10% f = 1kHz RL = 4I + 33FH THD+N = 1% f = 1kHz RL = 4I + 33FH THD+N = 10% f = 1kHz RL = 8I + 68FH THD+N = 1% f = 1kHz RL = 8I + 68FH f = 1kHz f = 20kHz VPVDD = 5.0V VPVDD = 4.2V VPVDD = 3.7V VPVDD = 5.0V VPVDD = 4.2V VPVDD = 3.7V VPVDD = 5.0V VPVDD = 4.2V VPVDD = 3.7V VPVDD = 5.0V VPVDD = 4.2V VPVDD = 3.7V RL = 4I, POUT = 1W RL = 8I POUT = 0.725W AV = 12dB AV = 9dB Output Power POUT Total Harmonic Distortion Plus Noise THD+N fIN = 1kHz Output Noise VN A-weighted (Note 4) AV = 6dB AV = 3dB AV = 0dB Efficiency Oscillator Frequency Spread-Spectrum Bandwidth Current Limit Thermal Shutdown Level E fOSC RL = 8I, POUT = 1.8W, f = 1kHz ����������������������������������������������������������������� Maxim Integrated Products 4 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSHDN = VGAIN = 5V, VPGND = 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2, 3) PARAMETER Thermal Hysteresis DIGITAL INPUT (SHDN) Input Voltage High Input Voltage Low Input Leakage Current VINH VINL VPVDD = 2.5V to 5.5V VPVDD = 2.5V to 5.5V TA = +25NC 1.4 0.4 Q1 V V FA SYMBOL CONDITIONS MIN TYP 15 MAX UNITS NC Note 2: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design. Note 3: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL = 4I, L = 33FH. For RL = 8I, L = 68FH. Note 4: Amplifier inputs AC-coupled to ground. Note 5: Mode transitions controlled by SHDN control pin. Typical Operating Characteristics (VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = +25NC, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX98314 toc01 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX98314 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY VPVDD = 3.7V ZLOAD = 4I + 33µH POUT = 0.8W MAX98314 toc03 10 VPVDD = 5V ZLOAD = 4I + 33µH 10 VPVDD = 4.2V ZLOAD = 4I + 33µH POUT = 1W 10 1 THD+N (%) POUT = 2W 0.1 POUT = 1.5W 1 THD+N (%) 1 THD+N (%) 0.1 0.1 0.01 0.01 POUT = 0.5W 0.01 POUT = 0.2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX98314 toc04 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX98314 toc05 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY VPVDD = 3.7V ZLOAD = 8I + 68µH POUT = 0.4W MAX98314 toc06 10 VPVDD = 5V ZLOAD = 8I + 68µH POUT = 1.2W 10 VPVDD = 4.2V ZLOAD = 8I + 68µH POUT = 0.6W 10 1 THD+N (%) 1 THD+N (%) 1 THD+N (%) 0.1 0.1 0.1 POUT = 0.2W 0.01 0.01 POUT = 0.2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.01 POUT = 0.3W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k ����������������������������������������������������������������� Maxim Integrated Products 5 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Typical Operating Characteristics (continued) (VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = +25NC, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX98314 toc07 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX98314 toc08 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VPVDD = 3.7V ZLOAD = 4I + 33µH MAX98314 toc09 100 10 THD+N (%) 1 0.1 0.01 VPVDD = 5V ZLOAD = 4I + 33µH 100 10 THD+N (%) 1 0.1 0.01 VPVDD = 4.2V ZLOAD = 4I + 33µH 100 10 THD+N (%) 1 0.1 0.01 f = 6kHz f = 1kHz f = 6kHz f = 1kHz f = 6kHz f = 1kHz f = 100Hz 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT POWER (W) 0.001 0 0.5 1.0 f = 100Hz 0.001 1.5 2.0 2.5 0 0.5 f = 100Hz 1.0 OUTPUT POWER (W) 1.5 2.0 OUTPUT POWER (W) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX98314 toc10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX98314 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VPVDD = 3.7V ZLOAD = 8I + 68µH MAX98314 toc12 100 10 THD+N (%) 1 0.1 0.01 VPVDD = 5V ZLOAD = 8I + 68µH 100 10 THD+N (%) 1 0.1 0.01 VPVDD = 4.3V ZLOAD = 8I + 68µH 100 10 THD+N (%) f = 6kHz f = 1kHz f = 6kHz f = 1kHz 1 0.1 0.01 f = 6kHz f = 1kHz f = 100Hz 0.001 0 0.5 1.0 OUTPUT POWER (W) 1.5 2.0 0.001 0 0.3 f = 100Hz f = 100Hz 0.001 0.9 1.2 1.5 0.6 0 0.3 0.6 OUTPUT POWER (W) 0.9 1.2 OUTPUT POWER (W) OUTPUT POWER vs. LOAD RESISTANCE MAX98314 toc13 OUTPUT POWER vs. LOAD RESISTANCE MAX98314 toc14 OUTPUT POWER vs. SUPPLY VOLTAGE 4.0 3.5 OUTPUT POWER (W) 3.0 2.5 2.0 1.5 1.0 0.5 THD+N = 1% THD+N = 10% f = 1kHz ZLOAD = 4I + 33µH MAX98314 toc15 4.5 4.0 3.5 OUTPUT POWER (W) 3.0 2.5 2.0 1.5 1.0 0.5 0 1 10 RLOAD (I) 100 THD+N = 1% THD+N = 10% VPVDD = 5V 2.5 2.0 OUTPUT POWER (W) 1.5 1.0 0.5 0 THD+N = 1% VPVDD = 3.7V 4.5 THD+N = 10% 1000 1 10 RLOAD (I) 100 1000 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) ����������������������������������������������������������������� Maxim Integrated Products 6 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Typical Operating Characteristics (continued) (VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = +25NC, unless otherwise noted.) OUTPUT POWER vs. SUPPLY VOLTAGE MAX98304 toc16 GAIN vs. FREQUENCY MAX98314 toc17 EFFICIENCY vs. OUTPUT POWER 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT POWER (W) ZLOAD = 8I + 68µH ZLOAD = 4I + 33µH VPVDD = 5V MAX98314 toc18 2.5 2.0 OUTPUT POWER (W) 1.5 1.0 0.5 0 2.5 3.0 3.5 4.0 4.5 5.0 THD+N = 1% f = 1kHz ZLOAD = 8I + 68µH 20 15 10 GAIN (dB) 5 0 -5 -10 -15 -20 GAIN = 3dB GAIN = 0dB GAIN = 9dB GAIN = 12dB 100 THD+N = 10% GAIN = 6dB 5.5 10 100 1k FREQUENCY (Hz) 10k 100k SUPPLY VOLTAGE (V) EFFICIENCY vs. OUTPUT POWER MAX98314 toc19 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX98314 toc20 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 90 80 70 PSRR (dB) 60 50 40 30 20 10 0 VRIPPLE = 200mVP-P ZLOAD = 8I + 68µH MAX98314 toc21 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 0.5 1.0 ZLOAD = 8I + 68µH VPVDD = 3.7V 2.0 1.8 1.6 SUPPLY CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 100 ZLOAD = 4I + 33µH 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 10 100 1k FREQUENCY (Hz) 10k 100k OUTPUT POWER (W) SUPPLY VOLTAGE (V) POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE MAX98314 toc22 COMMON-MODE REJECTION RATIO vs. FREQUENCY ZLOAD = 8I + 68µH AV = 9dB AV = 12dB AV = 6dB MAX98314 toc23 0 -10 -20 -30 -50 -60 -70 -80 -90 -100 2.5 -40 f = 1kHz VRIPPLE = 200mVP-P 120 110 100 90 CMRR (dB) 80 70 60 50 40 30 20 10 0 PSRR (dB) AV = 3dB AV = 0dB 3.0 3.5 4.0 4.5 5.0 5.5 10 100 1k FREQUENCY (Hz) 10k 100k SUPPLY VOLTAGE (V) ����������������������������������������������������������������� Maxim Integrated Products 7 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Typical Operating Characteristics (continued) (VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz to 22kHz, TA = +25NC, unless otherwise noted.) STARTUP RESPONSE MAX98314 toc24 SHUTDOWN RESPONSE MAX98314 toc25 VSHDN 2V/div VSHDN 2V/div ISPKR_OUT 100mA/div ISPKR_OUT 100mA/div 1ms/div WIDEBAND vs. FREQUENCY RBW = 100Hz MAX98314 toc26 NARROWBAND vs. FREQUENCY -20 OUTPUT MAGNITUDE (dBV) -40 -60 -80 -100 -120 -140 f = 1kHz VOUT = -60dBV MAX98314 toc27 0 -20 OUTPUT MAGNITUDE (dBV) -40 -60 -80 -100 -120 0.1 1 10 0 100 10 100 1k FREQUENCY (Hz) 10k 100k FREQUENCY (MHz) ����������������������������������������������������������������� Maxim Integrated Products 8 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Pin Configuration TOP VIEW (BUMP-SIDE DOWN) 1 MAX98314 2 3 + A OUTOUT+ PVDD B PGND N.C. GAIN C SHDN IN- IN+ WLP (0.3mm pitch) Pin Description BUMP A1 A2 A3 B1 B2 B3 C1 C2 C3 NAME OUTOUT+ PVDD PGND N.C. GAIN SHDN ININ+ Negative Speaker Output Positive Speaker Output Power Supply. Bypass PVDD with a 0.1FF and 10FF capacitor to PGND. Power Ground No Connection. Can be left unconnected or connected to PGND. Gain Select. See Table 1 for GAIN settings. Active-Low Shutdown Input. Drive SHDN low to place the device in shutdown. Inverting Audio Input Noninverting Audio Input FUNCTION ����������������������������������������������������������������� Maxim Integrated Products 9 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Detailed Description The MAX98314 features low quiescent current, a lowpower shutdown mode, comprehensive click-and-pop suppression, and excellent RF immunity. The IC offers Class AB audio performance with Class D efficiency in a minimal board-space solution. The Class D amplifier features spread-spectrum modulation, edgerate, and overshoot control circuitry that offers significant improvements to switch-mode amplifier radiated emissions. The amplifier features click-and-pop suppression that reduces audible transients on startup and shutdown. The amplifier additionally includes thermal overload and short-circuit protection. Highly linear, integrated input coupling capacitors (CIN) reduce solution size and provide excellent THD+N, PSRR, and CMRR performance at low frequencies vs. standard Class D amplifiers using external input capacitors. The IC’s filterless Class D amplifier offers much higher efficiency than Class AB amplifiers. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. Any power loss associated with the Class D output stage is mostly due to the I2R loss of the MOSFET on-resistance and quiescent switching current overhead. Ultra-Low EMI Filterless Output Stage Traditional Class D amplifiers require the use of external LC filters, or shielding, to meet electromagnetic interference (EMI) regulation standards. Maxim’s patented active emissions limiting edge-rate control circuitry and spread-spectrum modulation reduces EMI emissions, while maintaining up to 93% efficiency. The spread-spectrum modulation mode flattens wideband spectral components, while proprietary techniques ensure that the cycle-to-cycle variation of the switching period does not degrade audio reproduction or efficiency. The IC’s spread-spectrum modulator randomly varies the switching frequency by Q20kHz around the center frequency (300kHz). Above 10MHz, the wideband spectrum looks like noise for EMI purposes (Figure 1). If the output current of the speaker amplifier exceeds the current limit (2.8A typ), the IC disables the outputs for approximately 100Fs. At the end of 100Fs, the outputs are reenabled. If the fault condition still exists, the IC continues to disable and reenable the outputs until the fault condition is removed. The IC offers five programmable gain settings, selectable by a single gain input (GAIN). Amplifier Current Limit Selectable Amplifier Gain Table 1. GAIN Selection GAIN PIN Connect to PGND Connect to PGND through 100kI Q5% Connect to PVDD Connect to PVDD through 100kI Q5% Unconnected MAXIMUM GAIN (dB) 12 9 6 3 0 Class D Speaker Amplifier The IC integrates two 0.011FF input coupling capacitors, CIN. The input coupling capacitors, in conjunction with the amplifier’s internal input resistance (RIN), form a firstorder 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. 90 70 50 EN5502B LIMIT 30 HORIZONTAL 10 VERTICAL 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) Integrated Input Coupling Capacitors (CIN) EMISSIONS LEVEL (dBµV/m) -10 Figure 1. EMI Performance with 60cm of Speaker Cable, No Output Filter ���������������������������������������������������������������� Maxim Integrated Products 10 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Assuming zero source impedance, the -3dB corner frequency, f-3dB, is: f-3dB = 1/2GRINCIN [Hz] The 100ppm/V voltage coefficient of the integrated input coupling capacitor results in excellent low-frequency THD+N performance. Figure 2 illustrates the superior linearity of the IC’s integrated input coupling capacitors compared to a similar amplifier with external 0.01FF X7R and X5R 0402 input coupling capacitors. TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 10 VPVDD = 4.2V ZLOAD = 8I + 68µH POUT = 600mW X7R CAPS 0.1 X5R CAPS Applications Information Traditional Class D amplifiers require an output filter. The filter adds cost and size, and decreases efficiency and THD+N performance. The IC’s filterless modulation scheme does not require an output filter. Because the switching frequency of the IC is well beyond the bandwidth of most speakers, voice coil movement due to the switching frequency is very small. Use a speaker with a series inductance > 10FH. Typical 8I speakers exhibit series inductances in the 20FH to 100FH range. Speaker Amplifier Power-Supply Input (PVDD) PVDD powers the speaker amplifier and ranges from 2.5V to 5.5V. Bypass PVDD with a 0.1FF and 10FF capacitor to PGND. Apply additional bulk capacitance at the device if long input traces between PVDD and the power source are used. Proper layout and grounding are essential for optimum performance. Good grounding improves audio performance and prevents switching noise from coupling into the audio signal. 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 layers. Filterless Class D Operation 1.0 THD+N (%) 0.01 MAX98314 INTERNAL CAPS 10 100 1k FREQUENCY (Hz) 10k 100k Layout and Grounding 0.001 Figure 2. Low-Frequency THD+N Performance The IC features a low-power shutdown mode, drawing < 0.1FA (typ) of supply current. Drive SHDN low to put the IC into shutdown. The speaker amplifier features Maxim’s comprehensive click-and-pop suppression. During startup, the clickand-pop suppression circuitry reduces any audible transient sources internal to the device. When entering shutdown, the differential speaker outputs ramp down to PGND quickly and simultaneously. Shutdown Click-and-Pop Suppression ���������������������������������������������������������������� Maxim Integrated Products 11 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors For the latest application details on WLP construction, dimensions, tape carrier information, PCB techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications. Figure 3 shows the dimensions of the WLP balls used on the IC. WLP Applications Information 0.18mm Ordering Information 0.18mm PART MAX98314EWL+ TEMP RANGE -40NC to +85NC PIN-PACKAGE 9 WLP Figure 3. WLP Ball Dimensions +Denotes a lead(Pb)-free/RoHS-compliant package. ���������������������������������������������������������������� Maxim Integrated Products 12 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors 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 9 WLP (0.3mm pitch) PACKAGE CODE W90A0+1 OUTLINE NO. 21-0539 LAND PATTERN NO. Refer to Application Note 1891 COMMON DIMENSIONS PIN 1 INDICATOR 1 A E MARKING A3 A A1 A2 0.75 0.16 0.05 0.03 0.59 REF 0.040 BASIC 0.21 0.03 AAAA D A1 A3 A2 A b D1 E1 0.05 S S TOP VIEW See Note 7 SIDE VIEW 0.60 BASIC 0.60 BASIC 0.30 BASIC 0.00 0.00 BASIC BASIC e SD SE E PKG. CODE E1 SE e MIN MAX MIN D MAX DEPOPULATED BUMPS W90A0+1 0.95 0.98 0.95 0.98 NONE B SD C B A 1 2 3 D1 b NOTES: 1. Terminal pitch is defined by terminal center to center value. 2. Outer dimension is defined by center lines between scribe lines. 3. All dimensions in millimeter. 4. Marking shown is for package orientation reference only. 5. Tolerance is ± 0.02 unless specified otherwise. 6. All dimensions apply to PbFree (+) package codes only. 7. Front - side finish can be either Black or Clear. A BOTTOM VIEW TITLE -DRAWING NOT TO SCALE- Package Outline 9 bumps, WLP Pkg. 0.3MM Pitch DOCUMENT CONTROL NO. APPROVAL 21-0539 REV. B 1 1 ���������������������������������������������������������������� Maxim Integrated Products 13 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Revision History REVISION NUMBER 0 REVISION DATE 11/11 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 14 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.