KIT ATION EVALU E L B AVAILA 19-2841; Rev 1; 6/08 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown The MAX9710/MAX9711 are stereo/mono 3W bridge-tied load (BTL) audio power amplifiers. These devices are PC99/01 compliant, operate from a single 4.5V to 5.5V supply, and feature an industry-leading 100dB PSRR, which allows these devices to operate from noisy supplies without additional, costly power-supply conditioning. An ultra-low 0.005% THD+N ensures clean, low-distortion amplification of the audio signal while click-and-pop suppression eliminates audible transients on power and shutdown cycles. Power-saving features include low 2mV V OS (minimizing DC current drain through the speakers), low 7mA supply current, and a 0.5µA shutdown mode. A MUTE function allows the outputs to be quickly enabled or disabled. These devices include thermal overload protection, are specified over the extended -40°C to +85°C temperature range, and are supplied in thermally efficient packages. The MAX9710 is available in a 20-pin thin QFN package (5mm ✕ 5mm ✕ 0.8mm). The MAX9711 is available in a 12-pin thin QFN package (4mm ✕ 4mm ✕ 0.8mm). Features ♦ 3W into 3Ω (1% THD+N) ♦ 4W into 3Ω (10% THD+N) ♦ Industry-Leading, Ultra-High 100dB PSRR ♦ PC99/01 Compliant ♦ Click-and-Pop Suppression ♦ Low 0.005% THD+N ♦ Low Quiescent Current: 7mA ♦ Low-Power Shutdown Mode: 0.5µA ♦ MUTE Function ♦ Tiny 20-Pin Thin QFN (5mm ✕ 5mm ✕ 0.8mm) Ordering Information PART Applications Notebook PCs Two-Way Radios Flat-Panel TVs General-Purpose Audio Flat-Panel PC Displays Powered Speakers PGND OUTL+ PVDD OUTL- N.C. 18 17 16 MAX9711ETC -40°C to +85°C 12-Thin QFN-EP* Mono *EP = Exposed pad. Simplified Block Diagram SINGLE SUPPLY 4.5V TO 5.5V INL 1 15 PGND BIAS 2 14 SHDN N.C. 3 13 N.C. MUTE 4 12 VDD MAX9710 AMP Stereo TOP VIEW 19 PIN-PACKAGE -40°C to +85°C 20-Thin QFN-EP* Pin Configurations 20 TEMP RANGE MAX9710ETP LEFT IN MAX9710 RIGHT IN 11 8 9 10 OUTR- N.C. 7 PVDD 6 OUTR+ 5 PGND INR PGND TQFN Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX9710/MAX9711 General Description MAX9710/MAX9711 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS 20-Pin Thin QFN (derate 20.8mW/°C above +70°C) ....1667mW Operating Temperature Range............................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C VDD to GND, PGND ...............................................................+6V PVDD to VDD .......................................................................±0.3V PGND to GND.....................................................................±0.3V All Other Pins to GND.................................-0.3V to (VDD + 0.3V) Continuous Input Current (into any pin except power supply and output pins).........................±20mA Continuous Power Dissipation (TA = +70°C) 12-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1349mW 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. ELECTRICAL CHARACTERISTICS (VDD = PVDD = 5.0V, VGND = VPGND = VMUTE = 0V, V SHDN = 5V, RIN = RF = 15kΩ, RL = ∞. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Supply Voltage Range SYMBOL VDD/PVDD Quiescent Supply Current (IVDD + IPVDD) IDD Shutdown Supply Current I SHDN Turn-On Time tON CONDITIONS Inferred from PSRR test MIN TYP 4.5 MAX UNITS 5.5 V MAX9710 12 30 MAX9711 7 17 SHDN = GND 0.5 30 CBIAS = 1µF (10% of final value) 300 CBIAS = 0.1µF (10% of final value) 30 mA µA ms Thermal Shutdown Threshold 160 °C Thermal Shutdown Hysteresis 15 °C OUTPUT AMPLIFIERS Output Offset Voltage Power-Supply Rejection Ratio Output Power Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio VOS PSRR POUT THD+N SNR Slew Rate SR Maximum Capacitive Load Drive CL Crosstalk ±2 VOUT_+ - VOUT_-, AV = 2 VRIPPLE = 200mVP-P (Note 2) fIN = 1kHz, THD+N < 1% fIN = 1kHz, BW = 22Hz to 22kHz VDD = 4.5V to 5.5V 82 f = 1kHz 87 f = 20kHz 74 RL = 8Ω ±14 mV 100 1.1 dB 1.4 RL = 4Ω 2.6 RL = 3Ω W 3 POUT = 1.2W, RL = 8Ω 0.005 POUT = 2W, 4Ω 0.01 RL = 8Ω, VOUT = 2.8VRMS, BW = 22Hz to 22kHz % 95 dB 1.6 V/µs No sustained oscillations 1 nF fIN = 10kHz 77 dB BIAS VOLTAGE (BIAS) BIAS Voltage VBIAS Output Resistance RBIAS 2.35 2.5 2.65 50 V kΩ DIGITAL INPUTS (MUTE, SHDN) Input Voltage High VIH Input Voltage Low VIL 2 0.8 V Input Leakage Current IIN ±1 µA Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design. Note 2: PSSR is specified with the amplifier inputs connected to GND through RIN and CIN. 2 _______________________________________________________________________________________ V 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown RL = 3Ω AV = -4V/V 1 0.1 THD+N (%) THD+N (%) POUT = 500mW THD+N (%) 0.1 0.1 POUT = 500mW POUT = 2.5W POUT = 2.5W POUT = 2W 0.001 0.001 0.001 10 100 1k POUT = 250mW 0.01 0.01 0.01 RL = 4Ω AV = -2V/V 10k 10 100k MAx9710/11 toc03 1 MAx9710/11 toc02 RL = 3Ω AV = -2V/V MAx9710/11 toc01 1 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 100 1k 10k 10 100k 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY RL = 4Ω AV = -4V/V 0.1 1 MAx9710/11 toc05 1 MAx9710/11 toc04 1 RL = 8Ω AV = -2V/V 0.1 0.01 THD+N (%) THD+N (%) THD+N (%) 0.1 POUT = 250mW RL = 8Ω AV = -4V/V MAx9710/11 toc06 FREQUENCY (Hz) POUT = 250mW POUT = 250mW 0.01 0.01 POUT = 2W 0.001 0.001 10 100 1k 10k 100k 10 100 1k 10k 10 100k 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER f = 10kHz f = 20Hz 0.01 MAX9710/11 toc08 1 f = 10kHz f = 1kHz 0.1 AV = -2V/V RL = 4Ω 10 1 0.1 f = 20Hz f = 1kHz 0.001 f = 20Hz 0.001 0.001 1 2 OUTPUT POWER (W) 3 4 f = 10kHz f = 1kHz 0.01 0.01 0 100 THD+N (%) 1 AV = -4V/V RL = 3Ω 10 THD+N (%) 10 0.1 100 MAX9710/11 toc07 AV = -2V/V RL = 3Ω MAX9710/11 toc09 FREQUENCY (Hz) 100 THD+N (%) POUT = 1.2W POUT = 1.2W 0.001 0 1 2 OUTPUT POWER (W) 3 4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT POWER (W) _______________________________________________________________________________________ 3 MAX9710/MAX9711 Typical Operating Characteristics (VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) 1 f = 10kHz f = 1kHz 1 0.1 f = 20Hz 1.5 2.0 2.5 3.0 3.5 0 0.5 1.0 1.5 0.5 1.0 1.5 OUTPUT POWER vs. TEMPERATURE OUTPUT POWER vs. TEMPERATURE OUTPUT POWER vs. TEMPERATURE THD+N = 1% 2 THD+N = 10% 3 OUTPUT POWER (W) OUTPUT POWER (W) 3 2.0 MAX9710/11 toc14 MAX9710/11 toc13 4 THD+N = 1% 2 THD+N = 10% 1.5 THD+N = 1% 1.0 0.5 1 f = 1kHz RL = 3Ω f = 1kHz RL = 8Ω f = 1kHz RL = 4Ω 0 0 0 -15 10 35 60 85 -40 -15 10 35 60 -40 85 -15 10 35 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT POWER vs. LOAD RESISTANCE (FORCED-AIR COOLING) POWER DISSIPATION vs. OUTPUT POWER POWER DISSIPATION vs. OUTPUT POWER THD+N = 1% 2 1 1.2 1.0 0.8 0.6 0.4 0.2 RL = 4Ω f = 1kHz 0 0 1 10 100 LOAD RESISTANCE (Ω) 1000 0 0.5 1.0 1.5 OUTPUT POWER (W) 2.0 2.5 85 MAX9710/11 toc18 1.4 60 0.8 0.7 POWER DISSIPATION (W) THD+N = 10% 3 MAX9710/11 toc17 4 1.6 POWER DISSIPATION (W) VDD = 5V f = 1kHz MAX9710/11 toc16 TEMPERATURE (°C) 5 2.0 MAX9710/11 toc15 OUTPUT POWER (W) 1 4 0 2.0 OUTPUT POWER (W) THD+N = 10% OUTPUT POWER (W) f = 20Hz OUTPUT POWER (W) 4 -40 f = 1kHz 0.001 0.001 1.0 f = 10kHz 0.1 f = 20Hz 0.001 0.5 1 0.01 0.01 0 AV = -4V/V RL = 8Ω 10 f = 10kHz f = 1kHz 0.01 100 MAX9710/11 toc12 10 THD+N (%) THD+N (%) 10 AV = -2V/V RL = 8Ω THD+N (%) AV = -4V/V RL = 4Ω 0.1 100 MAX9710/11 toc10 100 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9710/11 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER OUTPUT POWER (W) MAX9710/MAX9711 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown 0.6 0.5 0.4 0.3 0.2 0.1 RL = 8Ω f = 1kHz 0 0 0.25 0.50 0.75 1.00 OUTPUT POWER (W) _______________________________________________________________________________________ 1.25 1.50 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown POWER-SUPPLY REJECTION RATIO vs. FREQUENCY CROSSTALK (dB) -20 VIN = 200mVP-P RL = 8Ω -20 -40 -60 MAX9710/11 toc20 VRIPPLE = 200mVP-P PSRR (dB) CROSSTALK vs. FREQUENCY 0 MAX9710/11 toc19 0 -40 -60 RIGHT TO LEFT -80 -80 -100 -100 -120 LEFT TO RIGHT 10 100 1k 10k 0.01 100k 0.1 1 10 100 FREQUENCY (Hz) FREQUENCY (Hz) ENTERING SHUTDOWN EXITING SHUTDOWN MAX9710/11 toc21 MAX9710/11 toc22 SHDN 2V/div SHDN 2V/div OUT_+ AND OUT_- 1V/div OUT_+ AND OUT_- 1V/div OUT_+ OUT_- 200mV/div OUT_+ OUT_- 200mV/div 100ms/div 100ms/div RL = 8Ω INPUT AC-COUPLED TO GND RL = 8Ω INPUT AC-COUPLED TO GND EXITING POWER-DOWN ENTERING POWER-DOWN MAX9710/11 toc24 MAX9710/11 toc23 VDD 2V/div VDD 2V/div OUT_+ AND OUT_- 1V/div OUT_+ AND OUT_- 1V/div OUT_+ OUT_- 200mV/div OUT_+ OUT_- 200mV/div 100ms/div 100ms/div RL = 8Ω INPUT AC-COUPLED TO GND RL = 8Ω INPUT AC-COUPLED TO GND _______________________________________________________________________________________ 5 MAX9710/MAX9711 Typical Operating Characteristics (continued) (VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) 12 10 8 TA = -40°C 6 TA = +85°C 8 6 4 TA = -40°C 4 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.0 0.8 SUPPLY CURRENT (μA) TA = +25°C TA = +25°C 10 SUPPLY CURRENT (mA) TA = +85°C MAX9710/11 toc26 16 14 12 MAX9710/11 toc25 18 MAX9711 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX9710/11 toc27 MAX9710 SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT (mA) MAX9710/MAX9711 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown TA = +25°C TA = +85°C 0.6 0.4 TA = -40°C 0.2 2 2 0 0 4.50 4.75 5.00 5.25 5.50 0 4.50 SUPPLY VOLTAGE (V) 4.75 5.00 5.25 5.50 4.50 4.75 SUPPLY VOLTAGE (V) 5.00 5.25 5.50 SUPPLY VOLTAGE (V) Pin Description PIN 6 NAME FUNCTION MAX9710 MAX9711 1 — INL 2 7 BIAS DC Bias Bypass. See BIAS Capacitor section for capacitor selection. 3, 10, 13, 16 — N.C. No Connection. Not internally connected. 4 9 MUTE 5 — INR 6, 11, 15, 20 1, 3 PGND 7 — OUTR+ 8, 18 5, 11 PVDD 9 — OUTR- Left-Channel Input Active-High Mute Input Right-Channel Input Power Ground Right-Channel Bridged Amplifier Positive Output Output Amplifier Power Supply Right-Channel Bridged Amplifier Negative Output 12 8 VDD 14 10 SHDN Power Supply Active-Low Shutdown. Connect SHDN to VDD for normal operation. 17 — OUTL- Left-Channel Bridged Amplifier Negative Output 19 — OUTL+ — 2 IN Left-Channel Bridged Amplifier Positive Output Amplifier Input — 6 GND Ground — 12 OUT- Bridged Amplifier Negative Output — 4 OUT+ Bridged Amplifier Positive Output — — EP Exposed Pad. Connect to ground plane. _______________________________________________________________________________________ 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown The MAX9710/MAX9711 are 3W BTL speaker amplifiers. The MAX9710 is a stereo speaker amplifier, while the MAX9711 is a mono speaker amplifier. Both devices feature a low-power shutdown mode, MUTE mode, and comprehensive click-and-pop suppression. These devices consist of high output-current op amps configured as BTL amplifiers (see Functional Diagrams). The device gain is set by RF and RIN. VOUT(P-P) +1 2 x VOUT(P-P) VOUT(P-P) -1 BIAS These devices operate from a single 5V supply and feature an internally generated, power-supply-independent, common-mode bias voltage of 2.5V referenced to ground. BIAS provides both click-and-pop suppression and sets the DC bias level for the audio outputs. BIAS is internally connected to the noninverting input of each speaker amplifier (see Functional Diagrams). Choose the value of the bypass capacitor as described in the BIAS Capacitor section. No external load should be applied to BIAS. Any load lowers the BIAS voltage, affecting the overall performance of the device. Shutdown The MAX9710/MAX9711 feature a 0.5µA low-power shutdown mode that reduces quiescent current consumption. Pulling SHDN low disables the device’s bias circuitry, the amplifier outputs are actively pulled low, and BIAS is driven to GND. Connect SHDN to VDD for normal operation. MUTE Both devices feature a clickless/popless MUTE mode. When the device is muted, the input disconnects from the amplifier. MUTE only affects the power amplifiers and does not shut down the device. Drive MUTE high to mute the device. Drive MUTE low for normal operation. Figure 1. Bridge-Tied Load Configuration Applications Information BTL Amplifier The MAX9710/MAX9711 are designed to drive a load differentially, a configuration referred to as BTL. The BTL configuration (Figure 1) offers advantages over the single-ended configuration, where one side of the load is connected to ground. Driving the load differentially doubles the output voltage compared to a singleended amplifier under similar conditions. Thus, the differential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is given by: A VD = 2 × RF RIN Substituting 2 x VOUT(P-P) for VOUT(P-P) into the following equations yields four times the output power due to doubling of the output voltage: VRMS = VOUT(P−P) 2 2 Click-and-Pop Suppression The MAX9710/MAX9711 feature Maxim’s comprehensive click-and-pop suppression. During startup, the common-mode bias voltage of the amplifiers slowly ramps to the DC bias point using an S-shaped waveform. When entering shutdown, the amplifier outputs are actively driven low simultaneously. This scheme minimizes the energy present in the audio band. For optimum click-and-pop suppression, choose: RIN x CIN < RBIAS x CBIAS 2 V POUT = RMS RL Since the differential outputs are biased at midsupply, there is no net DC voltage across the load. This eliminates the need for DC-blocking capacitors required for single-ended amplifiers. These capacitors can be large, expensive, consume board space, and degrade low-frequency performance. where RBIAS = 50kΩ. _______________________________________________________________________________________ 7 MAX9710/MAX9711 Detailed Description MAX9710/MAX9711 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown Power Dissipation and Heat Sinking Under normal operating conditions, the MAX9710/ MAX9711 dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation: PDISSPKG(MAX ) = TJ(MAX ) − TA θJA where TJ(MAX) is +150°C, TA is the ambient temperature, and θJA is the reciprocal of the derating factor in °C/W as specified in the Absolute Maximum Ratings section. For example, θ JA of the 20-pin thin QFN package is 48.1°C/W. The increase in power delivered by the BTL configuration directly results in an increase in internal power dissipation over the single-ended configuration. The maximum power dissipation for a given VDD and load is given by the following equation: PDISS(MAX) = 2VDD2 π 2RL If the power dissipation for a given application exceeds the maximum allowed for a given package, either reduce VDD, increase load impedance, decrease the ambient temperature, or add heat sinking to the device (see Layout and Grounding section). Large output, supply, and ground PC board traces improve the maximum power dissipation in the package. Thermal-overload protection limits total power dissipation in the MAX9710/MAX9711. When the junction temperature exceeds +160°C, the thermal protection circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 15°C. A pulsing output under continuous thermal-overload conditions results as the device heats and cools. Component Selection Gain-Setting Resistors External feedback components set the gain of both devices. Resistors RF and RIN (Functional Diagrams) set the gain of the amplifier as follows: AVD = 2 × 8 RF RIN Input Filter The input capacitor (CIN), in conjunction with RIN, forms a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is given by: f −3dB = 1 2πRINCIN For optimum click-and-pop suppression, choose: RIN x CIN < RBIAS x CBIAS where RBIAS = 50kΩ. Setting f -3dB too high affects the low-frequency response of the amplifier. Use capacitors with dielectrics that have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with highvoltage coefficients, such as ceramics, may result in an increase of distortion at low frequencies. BIAS Capacitor BIAS is the output of the internally generated 2.5VDC bias voltage. The BIAS bypass capacitor, C BIAS , improves PSRR and THD+N by reducing power supply and other noise sources at the common-mode bias node, and also generates the clickless/popless startup DC bias waveform for the speaker amplifiers. Bypass BIAS with a 1µF capacitor to GND. Smaller values of CBIAS produce faster tON/tOFF times but may result in increased click/pop levels. Supply Bypassing Proper power-supply bypassing ensures low-noise, low-distortion performance. Place a 0.1µF ceramic capacitor from V DD to PGND. Add additional bulk capacitance as required by the application. Locate the bypass capacitor as close to the device as possible. Piezoelectric Speaker Driver Low-profile piezoelectric speakers can provide quality sound for portable electronics. However, piezoelectric speakers typically require large voltage swings (>8V P-P ) across the speaker element to produce audible sound pressure levels. The MAX9711 can be configured to drive a piezoelectric speaker with up to 10VP-P while operating from a single 5V supply. Figure 2 shows the THD+N of the MAX9711 driving a piezoelectric speaker. Note that as frequency increases, the THD+N increases. This is due to the capacitive nature of the piezoelectric speaker; as frequency increases, the speaker impedance decreases, resulting in a larger current draw from the amplifier. _______________________________________________________________________________________ 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown 15kΩ 10 VOUT = 8VP-P MAX9710/MAX9711 TOTAL HARMONIC DISTORTI0N PLUS NOISE vs. FREQUENCY 1μF AUDIO INPUT 15kΩ 2 IN 10Ω OUT+ 4 1 THD+N (%) 100μH * 0.1 0.01 OUT- 0.001 0.01 0.1 1 10 100 MAX9711 12 *PIEZOELECTRIC SPEAKER. FREQUENCY (Hz) Figure 2. MAX9711 Piezoelectric Speaker Driver THD+N vs. Frequency The capacitive nature of the piezoelectric speaker may cause the MAX9711 to become unstable. A simple inductor/resistor network in series with the speaker isolates the speaker capacitance from the driver and ensures that the device output sees a resistive load of about 10Ω at high frequency, thereby maintaining stability (Figure 3). Figure 3. Isolation Network for Driving a Piezoelectric Speaker 5V PVDD VDD Layout and Grounding Good PC board layout is essential for optimizing performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance and route heat away from the device. Good grounding improves audio performance, minimizes crosstalk between channels, and prevents any digital switching noise from coupling into the audio signal. The MAX9710/MAX9711 thin QFN package features an exposed thermal pad on the underside. This pad lowers the thermal resistance of the package by providing a direct-heat conduction path from the die to the printed circuit board. Connect the exposed pad to the ground plane using multiple vias, if required. For optimum performance, connect to the ground planes as shown in Figure 4. MAX9710 FOR OPTIMUM PERFORMANCE, AUDIO GND SHOULD HAVE A STAR CONNECTION TO THE HIGH CURRENT, AMPLIFIER PGND AT A SINGLE POINT, PIN 6. PGND AUDIO SIGNAL GND Figure 4. MAX9710 Audio Ground Connection _______________________________________________________________________________________ 9 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711 Functional Diagrams RF 15kΩ CIN 0.1μF LEFT AUDIO INPUT RIN 15kΩ 1 INL OUTL+ 19 10kΩ 4.5V TO 5.5V SUPPLY 10kΩ 12 VDD PVDD 0.1μF 2,18 2 BIAS CBIAS 1μF OUTL- 17 BIAS 6, 11, 15, 20 PGND OUTR- 9 OUTR+ 7 14 SHDN 4 MUTE 10kΩ 10kΩ CIN 0.1μF RIGHT AUDIO INPUT RIN 15kΩ 5 INR MAX9710 RF 15kΩ PIN NUMBERS SHOWN ARE FOR THE 20 TQFN-EP PACKAGE. 10 ______________________________________________________________________________________ 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown RF 15kΩ CIN 0.1μF LEFT AUDIO INPUT RIN 15kΩ 2 IN OUT+ 4.5V TO 5.5V SUPPLY 4 10kΩ 10kΩ 8 VDD 0.1μF 5,11 PVDD OUT- 12 10 SHDN 9 MUTE 7 BIAS CBIAS 1μF MAX9711 BIAS GND PGND 6 1, 3 Pin Configurations (continued) TOP VIEW PGND 1 IN 2 PGND 3 OUT- PVDD SHDN 12 11 10 MAX9711 4 OUT+ 5 6 PVDD GND 9 MUTE 8 VDD 7 BIAS QFN ______________________________________________________________________________________ 11 MAX9710/MAX9711 Functional Diagrams (continued) 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711 System Diagram VDD (5V) 0.1μF 15kΩ 0.1μF 15kΩ INR VDD PVDD 0.1μF OUTR+ OUTR- MUTE AUX_IN 1μF BIAS MAX9710 1μF OUT SHDN MAX4060 BIAS OUTL- 0.1μF 15kΩ CODEC OUTL+ INL 15kΩ 2.2kΩ VCC 0.1μF IN+ IN- Q IN0.1μF Q MAX961 VDD/2 100kΩ IN+ 100kΩ 0.1μF SHDNL SHDNR 1μF INL VCC (3.3V) MAX4411 OUTL 1μF OUTR INR PVSS SVSS VCC 1μF C1P CIN 1μF 1μF Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 20 TQFN-EP T2055-4 21-0140 12 TQFN-EP T1244-4 21-0139 12 Chip Information MAX9710 TRANSISTOR COUNT: 1172 MAX9711 TRANSISTOR COUNT: 780 PROCESS: BiCMOS ______________________________________________________________________________________ 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown REVISION NUMBER REVISION DATE 0 4/03 Initial release 1 6/08 Removed TSSOP package DESCRIPTION PAGES CHANGED — 1, 2, 6, 9, 10 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX9710/MAX9711 Revision History