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 SIntegrated Input Coupling Capacitors with Excellent Linearity fC = 100Hz (6dB) fC = 200Hz (12dB) SLow Quiescent Current 0.95mA at 3.7V 1.2mA at 5.0V SDelivers High Output Power at 10% THD+N 3.2W into 4I, VPVDD = 5V 960mW into 8I, VPVDD = 3.7V SUltra-Low Noise: 19µV SEliminates Output Filtering Requirement Spread Spectrum and Active Emissions Limiting SClick-and-Pop Suppression SThermal and Overcurrent Protection SLow Current Shutdown Mode SSmall, Space-Saving Package Applications Simplified Block Diagram Mobile Phones Portable Audio Notebook Computers CIN MAX98314 MP3 Players Netbook Computers VoIP Phones Ordering Information appears at end of data sheet. CLASS D MODULATOR AND H-BRIDGE CIN 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 10µF* PVDD A3 SHDN C1 UVLO/POWER MANAGEMENT CLICK-AND-POP SUPPRESSION PVDD MAX98314 GAIN IN+ IN- B3 LOW-EMI DRIVER A1 OUT- A2 OUT+ C3 C2 PGND CLASS D MODULATOR PVDD LOW-EMI DRIVER 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 SYMBOL CONDITIONS MIN TYP MAX UNITS AMPLIFIER CHARACTERISTICS Supply Voltage Range VPVDD Guaranteed by PSRR test Undervoltage Lockout UVLO PVDD falling Quiescent Current IPVDD Shutdown Supply Current ISHDN Turn-On Time tON Bias Voltage VBIAS Voltage Gain AV Input Capacitance CIN 2.5 5.5 V 1.8 2.2 V VPVDD = 5V 1.2 1.8 VPVDD = 3.7V 0.95 VSHDN = 0V, TA = +25NC < 0.1 10 FA 3.7 10 ms f = 1kHz VPVDD/2 11.75 12 12.25 GAIN connected to PGND through 100kI Q5% resistor 8.75 9 9.25 GAIN connected to PVDD 5.75 6 6.25 GAIN connected to PVDD through 100kI Q5% resistor 2.75 3 3.25 GAIN unconnected -0.25 0 +0.25 0.011 AV = 12dB fC -3dB down AV = 6dB dB FF 199 AV = 9dB Highpass Corner Frequency V GAIN connected to PGND All gains mA 139 63 100 AV = 3dB 70 AV = 0dB 50 189 Hz ����������������������������������������������������������������� 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 SYMBOL Common-Mode Rejection Ratio CMRR Output Offset Voltage Click-and-Pop Level Power-Supply Rejection Ratio (Note 4) Output Power Output Noise TA = +25NC (Note 4) Q1 KCP RL = 8I + 68FH, peak voltage, TA = +25NC, A-weighted, 32 samples per second, TA = +25NC (Notes 4, 5) PSRR THD+N E Oscillator Frequency TYP VOS VN Efficiency MIN 67 POUT Total Harmonic Distortion Plus Noise CONDITIONS fIN = 1kHz, input referred fOSC Into shutdown Out of shutdown Q3 mV f = 1kHz -82 70 90 74 49 THD+N = 10% f = 1kHz RL = 4I + 33FH 3.2 VPVDD = 4.2V 2.2 VPVDD = 3.7V 1.7 THD+N = 1% f = 1kHz RL = 4I + 33FH VPVDD = 5.0V 2.6 VPVDD = 4.2V 1.8 VPVDD = 3.7V 1.4 THD+N = 10% f = 1kHz RL = 8I + 68FH VPVDD = 5.0V 1.8 VPVDD = 4.2V 1.2 VPVDD = 3.7V 0.96 THD+N = 1% f = 1kHz RL = 8I + 68FH VPVDD = 5.0V 1.4 VPVDD = 4.2V 1 VPVDD = 3.7V 0.8 RL = 4I, POUT = 1W 0.03 RL = 8I POUT = 0.725W 0.03 W 0.1 % AV = 12dB 31 AV = 9dB 26 AV = 6dB 23 AV = 3dB 21 AV = 0dB 19 RL = 8I, POUT = 1.8W, f = 1kHz dB 72 VPVDD = 5.0V A-weighted (Note 4) dB -59 f = 20kHz fIN = 1kHz UNITS dBV VPVDD = 2.5V to 5.5V, TA = +25NC f = 217Hz VRIPPLE = 200mVP-P MAX FVRMS 93 % 300 kHz Spread-Spectrum Bandwidth 20 kHz Current Limit 2.8 A Thermal Shutdown Level 155 NC ����������������������������������������������������������������� 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 SYMBOL CONDITIONS MIN TYP Thermal Hysteresis MAX UNITS 15 NC DIGITAL INPUT (SHDN) Input Voltage High VINH VPVDD = 2.5V to 5.5V Input Voltage Low VINL VPVDD = 2.5V to 5.5V 0.4 V TA = +25NC Q1 FA Input Leakage Current 1.4 V 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.) POUT = 2W POUT = 1.5W 0.01 10 POUT = 1W 0.1 VPVDD = 3.7V ZLOAD = 4I + 33µH POUT = 0.8W 1 0.01 0.1 0.01 POUT = 0.2W POUT = 0.5W 0.001 0.001 10k 100k 0.001 10 100 1k 10k 100k 100 1k 10k 100k FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 10 THD+N (%) 1 0.1 0.01 0.1 0.01 0.1 POUT = 0.2W 0.01 0.001 FREQUENCY (Hz) POUT = 0.4W POUT = 0.3W 0.001 1k VPVDD = 3.7V ZLOAD = 8I + 68µH 1 POUT = 0.6W POUT = 0.2W 100 10 THD+N (%) POUT = 1.2W VPVDD = 4.2V ZLOAD = 8I + 68µH MAX98314 toc06 FREQUENCY (Hz) VPVDD = 5V ZLOAD = 8I + 68µH 10 10 FREQUENCY (Hz) 1 THD+N (%) 1k MAX98314 toc05 10 100 MAX98314 toc04 10 MAX98314 toc03 VPVDD = 4.2V ZLOAD = 4I + 33µH 1 THD+N (%) THD+N (%) 1 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY THD+N (%) VPVDD = 5V ZLOAD = 4I + 33µH 0.1 10 MAX98314 toc01 10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX98314 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) ����������������������������������������������������������������� 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.) f = 1kHz 0.01 f = 1kHz 0.1 0.01 f = 100Hz 0.001 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.5 1.0 1.5 2.0 2.5 0 f = 6kHz 0.1 f = 1kHz MAX98314 toc09 f = 6kHz 1 f = 1kHz 0.1 0.01 0.01 f = 100Hz f = 100Hz f = 100Hz 0.001 0.001 0.001 1.5 0 2.0 0.3 OUTPUT POWER vs. LOAD RESISTANCE VPVDD = 5V 4.0 1.2 0 1.5 0.3 3.0 THD+N = 10% 2.0 1.5 1.0 VPVDD = 3.7V 2.0 THD+N = 10% THD+N = 1% 0.5 0.9 1.2 OUTPUT POWER vs. SUPPLY VOLTAGE 1.5 1.0 0.6 OUTPUT POWER (W) OUTPUT POWER vs. LOAD RESISTANCE OUTPUT POWER (W) 3.5 0.9 2.5 MAX98314 toc13 4.5 0.6 OUTPUT POWER (W) 4.5 f = 1kHz ZLOAD = 4I + 33µH 4.0 3.5 OUTPUT POWER (W) 1.0 OUTPUT POWER (W) MAX98314 toc14 0.5 VPVDD = 3.7V ZLOAD = 8I + 68µH 10 THD+N (%) THD+N (%) 10 MAX98314 toc12 VPVDD = 4.3V ZLOAD = 8I + 68µH 1 100 MAX98314 toc11 100 0.01 3.0 THD+N = 10% 2.5 2.0 1.5 THD+N = 1% 1.0 0.5 THD+N = 1% 0 0 1 2.0 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER f = 1kHz 0.5 1.5 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER f = 6kHz 2.5 1.0 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 1 0 0.5 OUTPUT POWER (W) 10 THD+N (%) 0 OUTPUT POWER (W) VPVDD = 5V ZLOAD = 8I + 68µH 0.1 0.001 OUTPUT POWER (W) MAX98314 toc10 100 OUTPUT POWER (W) f = 100Hz 0.001 0.5 f = 1kHz 0.1 0.01 f = 100Hz 0 f = 6kHz 1 MAX98314 toc15 0.1 f = 6kHz 1 VPVDD = 3.7V ZLOAD = 4I + 33µH 10 THD+N (%) f = 6kHz VPVDD = 4.2V ZLOAD = 4I + 33µH 10 THD+N (%) THD+N (%) 10 100 MAX98314 toc08 VPVDD = 5V ZLOAD = 4I + 33µH 1 100 MAX98314 toc07 100 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 10 100 RLOAD (I) 1000 1 10 100 RLOAD (I) 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.) GAIN vs. FREQUENCY 1.5 1.0 0 GAIN = 3dB GAIN = 0dB 80 GAIN = 6dB -10 THD+N = 1% 0.5 3.0 3.5 4.0 4.5 5.0 40 10 10 5.5 100 10k 1k 0 100k 1.0 1.5 2.0 2.5 3.0 EFFICIENCY vs. OUTPUT POWER SUPPLY CURRENT vs. SUPPLY VOLTAGE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 1.8 1.6 60 50 40 80 1.4 70 1.2 60 1.0 0.8 50 40 0.6 30 20 0.4 20 10 0.2 10 0 0 30 1.0 1.5 0 3.0 2.5 2.0 3.5 4.0 4.5 120 110 100 MAX98314 toc22 f = 1kHz VRIPPLE = 200mVP-P -20 1k 10k 100k FREQUENCY (Hz) CMRR (dB) -40 -50 -60 -70 ZLOAD = 8I + 68µH AV = 9dB 90 -30 PSRR (dB) 100 COMMON-MODE REJECTION RATIO vs. FREQUENCY POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE 0 10 5.5 SUPPLY VOLTAGE (V) OUTPUT POWER (W) -10 5.0 MAX98314 toc23 0.5 VRIPPLE = 200mVP-P ZLOAD = 8I + 68µH 90 PSRR (dB) SUPPLY CURRENT (mA) ZLOAD = 4I + 33µH 100 MAX98314 toc20 MAX98314 toc19 ZLOAD = 8I + 68µH 2.0 3.5 MAX98314 toc21 OUTPUT POWER (W) VPVDD = 3.7V 0 0.5 0 FREQUENCY (Hz) 90 70 50 SUPPLY VOLTAGE (V) 100 80 ZLOAD = 4I + 33µH 60 20 -20 2.5 ZLOAD = 8I + 68µH 70 30 -15 0 EFFICIENCY (%) 5 VPVDD = 5V 90 MAX98314 toc18 10 -5 100 EFFICIENCY (%) THD+N = 10% EFFICIENCY vs. OUTPUT POWER GAIN = 12dB GAIN = 9dB 15 GAIN (dB) OUTPUT POWER (W) MAX98304 toc16 f = 1kHz ZLOAD = 8I + 68µH 2.0 20 MAX98314 toc17 OUTPUT POWER vs. SUPPLY VOLTAGE 2.5 AV = 6dB AV = 12dB 80 70 60 50 40 AV = 3dB AV = 0dB 30 20 10 0 -80 -90 -100 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 10 100 1k 10k 100k FREQUENCY (Hz) ����������������������������������������������������������������� 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 SHUTDOWN RESPONSE MAX98314 toc24 MAX98314 toc25 VSHDN 2V/div VSHDN 2V/div ISPKR_OUT 100mA/div ISPKR_OUT 100mA/div 1ms/div -40 -60 -80 -100 f = 1kHz VOUT = -60dBV -20 OUTPUT MAGNITUDE (dBV) OUTPUT MAGNITUDE (dBV) MAX98314 toc26 RBW = 100Hz -20 0 MAX98314 toc27 NARROWBAND vs. FREQUENCY WIDEBAND vs. FREQUENCY 0 -40 -60 -80 -100 -120 -140 -120 0.1 1 10 FREQUENCY (MHz) 100 10 100 1k 10k 100k FREQUENCY (Hz) ����������������������������������������������������������������� Maxim Integrated Products 8 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors Pin Configuration TOP VIEW (BUMP-SIDE DOWN) MAX98314 1 2 3 A OUT- OUT+ PVDD B PGND N.C. GAIN C SHDN IN- IN+ + WLP (0.3mm pitch) Pin Description BUMP NAME A1 OUT- Negative Speaker Output FUNCTION A2 OUT+ Positive Speaker Output A3 PVDD Power Supply. Bypass PVDD with a 0.1FF and 10FF capacitor to PGND. B1 PGND Power Ground B2 N.C. No Connection. Can be left unconnected or connected to PGND. B3 GAIN Gain Select. See Table 1 for GAIN settings. C1 C2 SHDN IN- Active-Low Shutdown Input. Drive SHDN low to place the device in shutdown. Inverting Audio Input C3 IN+ Noninverting Audio Input ����������������������������������������������������������������� Maxim Integrated Products 9 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors 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. Class D Speaker Amplifier 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). Amplifier Current Limit 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. Selectable Amplifier Gain The IC offers five programmable gain settings, selectable by a single gain input (GAIN). Table 1. GAIN Selection GAIN PIN MAXIMUM GAIN (dB) Connect to PGND 12 Connect to PGND through 100kI Q5% 9 Connect to PVDD 6 Connect to PVDD through 100kI Q5% 3 Unconnected 0 Integrated Input Coupling Capacitors (CIN) 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 EMISSIONS LEVEL (dBµV/m) Detailed Description 70 50 EN5502B LIMIT 30 HORIZONTAL 10 -10 VERTICAL 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) 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: Filterless Class D Operation 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 THD+N (%) 1.0 VPVDD = 4.2V ZLOAD = 8I + 68µH POUT = 600mW 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. X7R CAPS X5R CAPS 0.1 Applications Information Layout and Grounding 0.01 MAX98314 INTERNAL CAPS 0.001 10 100 1k 10k 100k FREQUENCY (Hz) Figure 2. Low-Frequency THD+N Performance Shutdown The IC features a low-power shutdown mode, drawing < 0.1FA (typ) of supply current. Drive SHDN low to put the IC into shutdown. Click-and-Pop Suppression 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. 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. ���������������������������������������������������������������� Maxim Integrated Products 11 MAX98314 Mono 3.2W Class D Amplifier with Integrated Input Coupling Capacitors WLP Applications Information 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. 0.18mm Ordering Information 0.18mm PART TEMP RANGE PIN-PACKAGE MAX98314EWL+ -40NC to +85NC 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 PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 9 WLP (0.3mm pitch) W90A0+1 21-0539 Refer to Application Note 1891 COMMON DIMENSIONS PIN 1 INDICATOR MARKING E A3 1 A 0.75 0.05 A1 0.16 0.03 0.59 REF A2 A A1 D AAAA A2 TOP VIEW See Note 7 SIDE VIEW E E1 0.21 b A 0.05 S S 0.040 BASIC A3 E1 0.60 BASIC e 0.30 BASIC SD 0.00 BASIC SE 0.00 BASIC D PKG. CODE MIN MAX W90A0+1 0.95 0.98 0.03 D1 0.60 BASIC MIN MAX 0.95 0.98 DEPOPULATED BUMPS NONE SE e B SD C B D1 A 1 2 3 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- APPROVAL Package Outline 9 bumps, WLP Pkg. 0.3MM Pitch DOCUMENT CONTROL NO. 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 REVISION DATE 0 11/11 DESCRIPTION Initial release 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 © 2011 Maxim Integrated Products 14 Maxim is a registered trademark of Maxim Integrated Products, Inc.