MAX9736

19-3108; Rev 1; 10/08 KIT ATION EVALU BLE AVAILA Mono/Stereo High-Power Class D Amplifier MAX9736 General Description The MAX9736A/B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W into a 4Ω load. The MAX9736B delivers 2 x 6W into 8Ω loads or 1 x 12W into a 4Ω load. These devices are pinfor-pin compatible, allowing a single audio design to work across a broad range of platforms, simplifying design efforts, and reducing PCB inventory. Both devices operate from 8V to 28V and provide a high PSRR, eliminating the need for a regulated power supply. The MAX9736 offers up to 88% efficiency at 12V supply. Pin-selectable modulation schemes select between filterless modulation and classic PWM modulation. Filterless modulation allows the MAX9736 to pass CE EMI limits with 1m cables using only a low-cost ferrite bead and capacitor on each output. Classic PWM modulation is optimized for best audio performance when using a full LC filter. A pin-selectable stereo/mono mode allows stereo operation into 8Ω loads or mono operation into 4Ω loads. In mono mode, the right input op amp becomes available as a spare device, allowing flexibility in system design. Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown or mute. Input op amps allow the user to create summing amplifiers, lowpass or highpass filters, and select an optimal gain. The MAX9736A/B are available in 32-pin TQFN packages and specified over the -40°C to +85°C temperature range. Features ♦ Wide 8V to 28V Supply Voltage Range ♦ Spread-Spectrum Modulation Enables Low EMI Solution ♦ Passes CE EMI Limits with Low-Cost Ferrite Bead/Capacitor Filter ♦ Low BOM Cost, Pin-for-Pin Compatible Family ♦ High 67dB PSRR at 1kHz Reduces Supply Cost ♦ 88% Efficiency Eliminates Heatsink ♦ Thermal and Output Current Protection ♦ < 1µA Shutdown Mode ♦ Mute Function ♦ Space-Saving, 7mm x 7mm x 0.8mm, 32-Pin TQFN Package Applications LCD/PDP/CRT Monitors LCD/PDP/CRT TVs MP3 Docking Stations Notebook PCs PC Speakers All-in-One PCs Ordering Information PART MAX9736AETJ+ MAX9736BETJ+ STEREO/MONO OUTPUT POWER 15W stereo/ 30W mono PIN-PACKAGE 32 TQFN-EP* 6W stereo/ 32 TQFN-EP* 12W mono Note: All devices are specified over the -40°C to +85°C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Simplified Diagram 8V TO 28V 8Ω AUDIO INPUTS 8Ω INPUT RESISTORS AND CAPACITORS SELECT GAIN AND CUTOFF FREQUENCY SHDN MUTE MONO MAX9736 ________________________________________________________________ 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. Mono/Stereo High-Power Class D Amplifier MAX9736 ABSOLUTE MAXIMUM RATINGS PVDD to PGND.......................................................-0.3V to +30V AGND to PGND .....................................................-0.3V to +0.3V INL, INR, FBL, FBR, COM to AGND .........-0.3V to (VREG + 0.3V) MUTE, SHDN, MONO, MOD, REGEN to AGND.......-0.3V to +6V REG to AGND ..............................................-0.3V to (VS + 0.3V) VS to AGND (Note 1)................................................-0.3V to +6V OUTL+, OUTL-, OUTR+, OUTR-, to PGND...................................-0.3V to (PVDD + 0.3V) C1N to PGND ..........................................-0.3V to (PVDD + 0.3V) C1P to PGND ...........................(PVDD - 0.3V) to (VBOOT + 0.3V) BOOT to PGND ............................................(VC1P - 0.3V) to 36V OUTL+, OUTL-, OUTR+, OUTR-, Short Circuit to PGND or PVDD...............................Continuous Thermal Limits (Notes 2, 3) Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN Single-Layer PCB (derate 27mW/°C above +70°C) .....................................2.16W θJA...................................................................................37°C/W θJC ....................................................................................1°C/W Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN Multiple Layer PCB (derate 37mW/°C above +70°C) .....................................2.96W θJA...................................................................................27°C/W θJC ....................................................................................1°C/W 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 Note 1: VS cannot exceed PVDD + 0.3V. See the Power Sequencing section. Note 2: Thermal performance of this device is highly dependant on PCB layout. See the Applications Information section for more details. Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, visit www.maxim-ic.com/thermal-tutorial. 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 (VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1µF, C2 = 1µF, RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 4, 5) PARAMETER Speaker Supply Voltage Range Preamplifier Supply Voltage Range Undervoltage Lockout SYMBOL PVDD VS UVLO IPVDD Quiescent Supply Current IVS Shutdown Supply Current REG Voltage Preregulator Voltage COM Voltage Capacitive Drive Output Swing (Note 6) Open-Loop Gain Input Offset Voltage AVO VOS ISHDN VREG VS VCOM CL Sinking ±1mA VFB_ = VCOM ±500mV, RFB_= 20kΩ to IN_ Internal regulated 5V, VREGEN = 5V 1.9 RL = ∞, VREGEN = 5V, VVS = open RL = ∞, VREGEN = 0V, VVS = 5V VSHDN = 0V TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX IPVDD IVS 4.2 4.8 2.05 30 ±2 88 ±1 2.2 1 14 CONDITIONS Inferred from PSRR test (Notes 1 and 7) MIN 8 4.5 7 30 45 50 20 22 10 10 TYP MAX 28 5.5 UNITS V V V mA mA µA V V V pF V dB mV AMPLIFIER DC CHARACTERISTICS INPUT AMPLIFIER CHARACTERISTICS 2 _______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier ELECTRICAL CHARACTERISTICS (continued) (VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1µF, C2 = 1µF, RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 4, 5) PARAMETER Input Amplifier Slew Rate Input Amplifier Unity-Gain Bandwidth AMPLIFIER CHARACTERISTICS Output Amplifier Gain (Note 8) Output Current Limit Output Offset Power-Supply Rejection Ratio VOS PSRR OUT_+ to OUT_-, TA = +25°C PVDD = 8V to 28V, TA = +25°C f = 1kHz, 100mVP-P ripple PVDD = 12V MAX9736A Output Power (THD+N = 1%) POUT_1% Stereo Mono PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736B Output Power (THD+N = 1%) POUT_1% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736A Output Power (THD+N = 10%) POUT_10% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736B Output Power (THD+N = 10%) POUT_10% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono RL = 8Ω RL = 4Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 4Ω RL = 8Ω RL = 4Ω RL = 8Ω RL = 4Ω 65 AV MAX9736A MAX9736B 16.5 13.1 3.3 17 13.6 4.6 ±2 80 67 8 13 15.5 13.5 27 13.5 27 6 11 12 6 12 6 12 10 16 19.5 17.5 35 17.5 35 7.5 14 15 7.5 15 7.5 15 W W W W ±10 17.5 14.1 dB A mV dB SYMBOL CONDITIONS MIN TYP 2.5 3.5 MAX UNITS V/µs MHz MAX9736 PVDD = 12V PVDD = 12V PVDD = 12V _______________________________________________________________________________________ 3 Mono/Stereo High-Power Class D Amplifier MAX9736 ELECTRICAL CHARACTERISTICS (continued) (VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1µF, C2 = 1µF, RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 4, 5) PARAMETER Total Harmonic Distortion Plus Noise SYMBOL CONDITIONS MAX9736A, POUT = 4W, f = 1kHz, PWM modulation mode, RL = 8Ω MAX9736B, POUT = 2W, f = 1kHz, PWM modulation mode, RL = 8Ω MAX9736A, POUT = 8W, RL = 8Ω MAX9736B, POUT = 6W, RL = 8Ω Noise Crosstalk Efficiency η VN A-weighted (Note 9) MAX9736A MAX9736B MIN TYP 0.04 % 0.04 96.5 dB 97 120 100 100 88 36 dBV Out of mute 270 36 300 ±4 160 30 tON VINH VINL 50 ±10 2 0.8 110 330 kHz kHz °C °C ms V V mV µA µVRMS dB % MAX UNITS THD+N Signal-to-Noise Ratio SNR A-weighted L to R, R to L, POUT = 1W, f = 1kHz, RL = 8Ω POUT = 8W, MAX9736A, PVDD = 12V, RL = 8Ω Peak voltage, 32 samples/second, A-weighted (Notes 9 and 10) Into mute Click-and-Pop Level KCP Switching Frequency Spread-Spectrum Bandwidth Thermal Shutdown Level Thermal Shutdown Hysteresis Turn-On Time DIGITAL INTERFACE Input Voltage High Input Voltage Low Input Voltage Hysteresis Input Leakage Current Note 4: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design. Note 5: Stereo mode (MONO = GND) specified with 8Ω resistive load in series with a 68µH inductive load connected across BTL outputs. Mono mode (MONO = 5V) specified with a 4Ω resistive load in series with a 33µH inductive load connected across BTL outputs. Note 6: Output swing is specified with respect to VCOM. Note 7: For typical applications, an external 5V supply is not required. Therefore, set REGEN = 5V. If thermal performance is a concern, set REGEN = 0V and provide an external regulated 5V supply. Note 8: Output amplifier gain is defined as: ⎛ | (VOUT_ + ) − (VOUT _ − ) | ⎞ 20 × log⎜ ⎟ | VFB _ | ⎝ ⎠ Note 9: Amplifier inputs AC-coupled to GND. Note 10: Specified at room temperature with an 8Ω resistive load in series with a 68µH inductive load connected across BTL outputs. Mode transitions controlled by SHDN control pin. 4 _______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Typical Operating Characteristics (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX9736 toc01 MAX9736 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX9736 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY PVDD = 12V, FIXED FREQUENCY, 4Ω LOAD POUT = 5W MAX9736 toc03 1 1 PVDD = 12V, FIXED FREQUENCY, 8Ω LOAD POUT = 5W PVDD = 12V, SPREAD SPECTRUM, 8Ω LOAD POUT = 5W 1 0.1 THD+N (%) THD+N (%) 0.1 0.1 THD+N (%) POUT = 3W 0.01 POUT = 3W 0.01 POUT = 3W 0.01 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX9736 toc04 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc05 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER PVDD = 12V, SPREAD SPECTRUM, 8Ω LOAD 6kHz 1kHz 0.1 MAX9736 toc06 1 PVDD = 12V, SPREAD SPECTRUM, 4Ω LOAD 10 PVDD = 12V, FIXED FREQUENCY, 8Ω LOAD 6kHz 0.1 10 1 0.1 THD+N (%) THD+N (%) POUT = 5W 1 THD+N (%) 1kHz 0.01 POUT = 3W 0.01 20Hz 0.01 20Hz 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 0 1 2 3 4 5 6 7 8 9 10 OUTPUT POWER (W) 0.001 0 1 2 3 4 5 6 7 8 9 10 OUTPUT POWER (W) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc07 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc08 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER PVDD = 24V, FIXED FREQUENCY, 8Ω LOAD 6kHz THD+N (%) 0.1 MAX9736 toc09 10 PVDD = 18V, FIXED FREQUENCY, 8Ω LOAD 6kHz 0.1 1kHz 10 PVDD = 18V, SPREAD SPECTRUM, 8Ω LOAD 1kHz 0.1 6kHz 10 1 THD+N (%) 1 THD+N (%) 1 0.01 20Hz 0.001 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W) 0.01 20Hz 0.01 1kHz 20Hz 0.001 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W) 0.001 0 4 8 12 16 OUTPUT POWER (W) _______________________________________________________________________________________ 5 Mono/Stereo High-Power Class D Amplifier MAX9736 Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER PVDD = 12V, SPREAD SPECTRUM, 4Ω LOAD 1kHz 6kHz 0.1 20Hz 0.01 MAX9736 toc12 10 PVDD = 24V, SPREAD SPECTRUM, 8Ω LOAD 1kHz 0.1 6kHz 10 PVDD = 12V, FIXED FREQUENCY, 4Ω LOAD 1 6kHz THD+N (%) 10 1 THD+N (%) 1 THD+N (%) 14 16 0.1 20Hz 1kHz 0.01 0.01 20Hz 0.001 0 2 4 6 8 10 12 14 16 18 OUTPUT POWER (W) 0.001 0 2 4 6 8 10 12 OUTPUT POWER (W) 0.001 0 3 6 9 12 15 18 OUTPUT POWER (W) EFFICIENCY vs. TOTAL OUTPUT POWER 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION MAX9736 toc13 EFFICIENCY vs. TOTAL OUTPUT POWER 10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 14 16 18 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION MAX9736 toc14 PVDD = 12V, FIXED FREQUENCY, 8Ω LOAD EFFICIENCY PVDD = 12V, SPREAD SPECTRUM, 8Ω LOAD EFFICIENCY 10 9 POWER DISSIPATION (W) POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 EFFICIENCY vs. TOTAL OUTPUT POWER 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 TOTAL OUTPUT POWER (W) EFFICIENCY POWER DISSIPATION MAX9736 toc15 EFFICIENCY vs. TOTAL OUTPUT POWER 10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 TOTAL OUTPUT POWER (W) POWER DISSIPATION MAX9736 toc16 PVDD = 18V, SPREAD SPECTRUM, 8Ω LOAD PVDD = 18V, FIXED FREQUENCY, 8Ω LOAD EFFICIENCY 10 9 8 7 6 5 4 3 2 1 0 6 _______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) EFFICIENCY vs. TOTAL OUTPUT POWER 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION PVDD = 24V, FIXED FREQUENCY, 8Ω LOAD EFFICIENCY MAX9736 toc17 MAX9736 EFFICIENCY vs. TOTAL OUTPUT POWER 10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY PVDD = 24V, SPREAD SPECTRUM, 8Ω LOAD MAX9736 toc18 10 9 POWER DISSIPATION (W) POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 EFFICIENCY vs. TOTAL OUTPUT POWER 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY MAX9736 toc19 EFFICIENCY vs. TOTAL OUTPUT POWER 10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY PVDD = 12V, SPREAD SPECTRUM, 4Ω LOAD MAX9736 toc20 10 9 8 7 6 5 4 3 2 1 0 PVDD = 12V, FIXED FREQUENCY, 4Ω LOAD TOTAL OUTPUT POWER vs. VDD LOAD = 8Ω, f = 1kHz MAX9736 toc21 TOTAL OUTPUT POWER vs. LOAD RESISTANCE VDD = 12V, f = 1kHz, SPREAD SPECTRUM MAX9736 toc22 TOTAL OUTPUT POWER vs. LOAD RESISTANCE VDD = 18V, f = 1kHz, SPREAD SPECTRUM MAX9736 toc23 40 35 OUTPUT POWER (W) 30 25 20 15 10 5 0 5 10 15 20 25 1% THD+N 10% THD+N 16 14 OUTPUT POWER (W) 12 10 8 10% THD+N 6 4 2 0 5 1% THD+N 30 25 OUTPUT POWER (W) 20 15 10 5 0 1% THD+N 10% THD+N 30 10 15 20 25 30 5 10 15 20 25 30 SUPPLY VOLTAGE (V) LOAD RESISTANCE (Ω) LOAD RESISTANCE (Ω) _______________________________________________________________________________________ 7 Mono/Stereo High-Power Class D Amplifier MAX9736 Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) TOTAL OUTPUT POWER vs. LOAD RESISTANCE MAX9736 toc24 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -10 -20 -30 PSRR (dB) 100mVP-P, PVDD RIPPLE, 8Ω LOAD MAX9736 toc25 CROSSTALK vs. FREQUENCY 1W OUTPUT, 8Ω LOAD, SPREAD SPECTRUM MAX9736 toc26 40 35 TOTAL OUTPUT POWER (W) 30 25 20 15 10 1% THD+N 5 0 0 5 10 15 20 25 10% THD+N PVDD = 24V, SPREAD SPECTRUM 0 0 -20 CROSSTALK (dB) -40 -60 RIGHT TO LEFT -80 -100 LEFT TO RIGHT -120 -40 -50 -60 -70 -80 -90 30 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k FREQUENCY (Hz) 10k 100k LOAD RESISTANCE (Ω) INBAND OUTPUT SPECTRUM MAX9736 toc27 INBAND OUTPUT SPECTRUM MAX9736 toc28 WIDEBAND OUTPUT SPECTRUM 8Ω LOAD, FIXED FREQUENCY MAX9736 toc29 0 -20 OUTPUT AMPLITUDE (dBV) -40 -60 -80 -100 -120 0 5 10 FREQUENCY (kHz) 15 8Ω LOAD, FIXED FREQUENCY 0 -20 OUTPUT AMPLITUDE (dBV) -40 -60 -80 -100 -120 8Ω LOAD, SPREAD SPECTRUM 20 0 OUTPUT AMPLITUDE (dBV) -20 -40 -60 -80 -100 -120 20 0 5 10 FREQUENCY (kHz) 15 20 0.1 1 10 100 FREQUENCY (MHz) WIDEBAND OUTPUT SPECTRUM 0 OUTPUT AMPLITUDE (dBV) -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 100 8Ω LOAD, SPREAD SPECTRUM MAX9736 toc30 SHDN ON-/OFF-RESPONSE MAX9736 toc31 MUTE ON-/OFF-RESPONSE MAX9736 toc32 10 SHDN 2V/div MUTE 2V/div OUTPUT 5V/div OUTPUT 5V/div 40ms/div 40ms/div FREQUENCY (MHz) 8 _______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE MAX9736 toc33 MAX9736 SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE VREGEN = 0V, VMUTE = VSHDN = 3.3V, VS = 5V SUPPLY CURRENT (mA) 15 MAX9736 toc34 SUPPLY CURRENT vs. VS SUPPLY VOLTAGE VREGEN = 0V, VMUTE = VSHDN = 3.3V 13 SUPPLY CURRENT (mA) MAX9736 toc35 40 VREGEN = VMUTE = VSHDN = 3.3V SUPPLY CURRENT (mA) 30 20 15 11 20 10 9 10 5 7 0 8 13 18 SUPPLY VOLTAGE (V) 23 28 0 8 13 18 SUPPLY VOLTAGE (V) 23 28 5 4.5 4.7 4.9 5.1 5.3 5.5 VS VOLTAGE (V) SHUTDOWN CURRENT vs. PVDD SUPPLY VOLTAGE MAX9736 toc36 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX9736 toc37 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY PVDD = 12V, SPREAD SPECTRUM, 4Ω LOAD, MONO POUT = 10W MAX9736 toc38 3 VREGEN = VSHDN = 0V, VMUTE = 3.3V SHUTDOWN CURRENT (μA) 2 1 PVDD = 12V, FIXED FREQUENCY, 4Ω LOAD, MONO 1 POUT = 10W 0.1 THD+N (%) 1 THD+N (%) 0.1 0 POUT = 6W 0.01 POUT = 6W 0.01 -1 -2 8 12 16 20 24 28 SUPPLY VOLTAGE (V) 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc39 PVDD = 12V, FIXED FREQUENCY, 4Ω LOAD, MONO 1 THD+N (%) 6kHz 1 THD+N (%) 1kHz 6kHz 0.1 1kHz 20Hz 0.1 20Hz 0.01 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W) 0.01 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W) _______________________________________________________________________________________ MAX9736 toc40 10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (VDD = 12V, SPREAD SPECTRUM, 4Ω LOAD, MONO) 10 9 Mono/Stereo High-Power Class D Amplifier MAX9736 Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc41 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX9736 toc42 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER PVDD = 24V, FIXED FREQUENCY, 4Ω LOAD, MONO MAX9736 toc43 10 PVDD = 18V, FIXED FREQUENCY, 4Ω LOAD, MONO 10 PVDD = 18V, SPREAD SPECTRUM, 4Ω LOAD, MONO 10 1 THD+N (%) THD+N (%) 6kHz 1 THD+N (%) 6kHz 1kHz 0.1 1 6kHz 0.1 1kHz 0.1 1kHz 20Hz 0.01 0 5 10 15 20 25 30 35 OUTPUT POWER (W) 0.01 0 5 10 15 20 25 20Hz 0.01 30 35 0 5 10 15 20 20Hz 25 30 35 OUTPUT POWER (W) OUTPUT POWER (W) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (VDD = 24V, SPREAD SPECTRUM, 4Ω LOAD, MONO) MAX9736 toc44 EFFICIENCY vs. OUTPUT POWER 80 70 EFFICIENCY (%) 60 PVDD = 18V 50 40 30 20 PVDD = 24V PVDD = 12V MAX9736 toc45 10 90 1 THD+N (%) 6kHz 1kHz 0.1 20Hz 0.01 0 6 12 18 24 30 36 OUTPUT POWER (W) 10 0 0 5 4Ω LOAD, MONO, 1kHz FIXED FREQUENCY 10 OUTPUT POWER (W) 15 20 EFFICIENCY vs. OUTPUT POWER MAX9736 toc46 OUTPUT POWER vs. VDD (LOAD = 4Ω, f = 1kHz, SPREAD SPECTRUM, MONO) 35 OUTPUT POWER (W) 30 25 20 15 10 4Ω LOAD f = 1kHz, SPREAD SPECTRUM, MONO 8 10 12 14 16 18 20 22 24 26 28 SUPPLY VOLTAGE (V) 1% THD+N 10% THD+N MAX9736 toc47 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 OUTPUT POWER (W) 15 4Ω LOAD, MONO, f = 1kHz SPREAD SPECTRUM PVDD = 12V PVDD = 18V PVDD = 24V 40 5 0 20 10 ______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Typical Operating Characteristics (continued) (MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) OUTPUT POWER vs. LOAD RESISTANCE MAX9736 toc48 MAX9736 OUTPUT POWER vs. LOAD RESISTANCE MAX9736 toc49 OUTPUT POWER vs. LOAD RESISTANCE 35 OUTPUT POWER (W) 30 25 20 15 10 10% THD+N PVDD = 24V, MONO, SPREAD SPECTRUM MAX9736 toc50 20 18 16 OUTPUT POWER (W) 14 12 10 8 6 4 2 0 0 5 10 15 20 25 1% THD+N 10% THD+N PVDD = 12V, MONO, SPREAD SPECTRUM 40 35 OUTPUT POWER (W) 30 25 20 10% THD+N 15 10 5 0 0 5 1% THD+N 10 15 20 25 PVDD = 18V, MONO, SPREAD SPECTRUM 40 5 0 30 0 1% THD+N 5 10 15 20 25 30 30 LOAD RESISTANCE (Ω) LOAD RESISTANCE (Ω) LOAD RESISTANCE (Ω) SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE MAX9736 toc51 SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE VREGEN = 0V, VMUTE = VSHDN = 3.3V, VS = 5V, MONO SUPPLY CURRENT (mA) 15 MAX9736 toc52 SUPPLY CURRENT vs. VS VOLTAGE VREGEN = 0V, VMUTE = VSHDN = 3.3V, MONO SUPPLY CURRENT (mA) 15 MAX9736 toc53 45 VREGEN = VMUTE = VSHDN = 3.3V, MONO SUPPLY CURRENT (mA) 20 20 30 10 10 15 5 5 0 8 13 18 23 28 SUPPLY VOLTAGE (V) 0 8 13 18 SUPPLY VOLTAGE (V) 23 28 0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 VS VOLTAGE (V) ______________________________________________________________________________________ 11 Mono/Stereo High-Power Class D Amplifier MAX9736 Pin Description PIN 1, 2 3 4 5 6 7, 8, 17 9 10 11 12 13, 14 15 16 NAME OUTLBOOT MONO FBL INL N.C. MUTE SHDN REGEN COM AGND REG VS Left-Channel Negative Speaker Output Charge-Pump Output. Connect a 1µF charge-pump holding capacitor from BOOT to PGND. Mono Select. Set MONO high for mono mode, low for stereo mode. Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain. Stereo Left-Channel Inverting Input. In mono mode, INL is the inverting audio input for the mono amplifier. No Connection. Not internally connected. OK to connect to PGND. Mute Input. Drive MUTE low to place the device in mute mode. Shutdown Input. Drive SHDN low to place the device in shutdown mode. Internal Regulator Enable Input. Connect REGEN to SHDN to enable the internal regulator. Drive REGEN low to disable the internal regulator, and supply the device with an external 5V supply on VS. See the Power-Supply Sequencing section. Internal 2V Bias. Bypass COM to AGND with a 1µF capacitor. Analog Ground Internal Regulator Output. Bypass REG to AGND with a 1µF capacitor. 5V Regulator Supply. Bypass VS to AGND with a 1µF capacitor. If REGEN is low, the internal regulator is disabled, and an external 5V supply must be connected to VS. See the Power-Supply Sequencing section. Stereo Right-Channel Inverting Audio Input. In mono mode, INR is the inverting audio input for the uncommitted preamplifier (see the Mono Configuration section for more details). Right-Channel Feedback. Connect feedback resistor between FBR and INR to set amplifier gain. Output Modulation Select. Sets the output modulation scheme: VMOD = Low, classic PWM/fixed-frequency mode VMOD = High, filterless modulation/spread-spectrum mode Charge-Pump Flying-Capacitor Negative Terminal Charge-Pump Flying-Capacitor Positive Terminal Right-Channel Negative Speaker Output Right-Channel Positive Speaker Output Power Supply. Bypass each PVDD pin to ground with 0.1µF capacitors. Also, use a single 220µF capacitor between PVDD and PGND. Power Ground Left-Channel Positive Speaker Output Exposed Pad. Must be externally connected to PGND. FUNCTION 18 19 20 21 22 23, 24 25, 26 27, 30 28, 29 31, 32 — INR FBR MOD C1N C1P OUTROUTR+ PVDD PGND OUTL+ EP 12 ______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier MAX9736 Detailed Description The MAX9736A/MAX9736B filterless, stereo Class D audio power amplifiers offer Class AB performance and Class D efficiency with minimal board space. The MAX9736A outputs 2x15W in stereo mode and 30W in mono mode. The MAX9736B outputs 2x6W in stereo mode and 12W in mono mode. These devices operate from an 8V to 28V supply range. The MAX9736 features a filterless, spread-spectrum switching mode (MOD = high) or a classic PWM fixedfrequency switching mode (MOD = low). The MAX9736 features externally set gain and a lowpower shutdown mode that reduces supply current to less than 1µA. Comprehensive click-and-pop circuitry minimizes noise into and out of shutdown or mute. Efficiency The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. In a Class D amplifier, the output transistors act as switches and consume negligible power. Power loss associated with the Class D output stage is due to the I2R loss of the MOSFET on-resistance, various switching losses, and quiescent current overhead. The theoretical best efficiency of a linear amplifier is 78% at peak output power. Under typical music reproduction levels, the efficiency falls below 30%, whereas the MAX9736 exhibits > 80% efficiency under the same conditions (Figure 1). Shutdown The MAX9736 features a shutdown mode that reduces power consumption and extends battery life in portable applications. The shutdown mode reduces supply current to 1µA (typ). Drive SHDN high for normal operation. Drive SHDN low to place the device in low-power shutdown mode. In shutdown mode, the outputs are high impedance; and the common-mode voltage at the output decays to zero. In shutdown mode, connect REGEN low to minimize current consumption. Operating Modes Filterless Modulation/PWM Modulation The MAX9736 features two output modulation schemes, filterless modulation (MOD = high) or classic PWM (MOD = low). Maxim’s unique, filterless modulation scheme eliminates the LC filter required by traditional Class D amplifiers, reducing component count, conserving board space, and reducing system cost. Configure for classic PWM output when using a full LC filter. Click-and-pop protection does not apply when the output is switching between modulation schemes. To maintain click-and-pop protection when switching between output schemes the device must enter shutdown mode and be configured to the new output scheme before the startup sequence is finished. Spread-Spectrum Mode The MAX9736 features a unique, patented spread-spectrum mode that flattens the wideband spectral components, improving EMI radiated by the speaker and cables. The switching frequency of the Class D amplifier varies randomly by ±6kHz around the 300kHz center frequency. Instead of a large amount of spectral energy present at multiples of the switching frequency, the energy is spread over a bandwidth that increases with frequency. Above a few megahertz, the wideband spectrum looks like white noise for EMI purposes. A proprietary amplifier topology ensures this white noise does not corrupt the noise floor in the audio bandwidth. The spreadspectrum mode is enabled only with filterless modulation. Mute Function The MAX9736 features a clickless-and-popless mute mode. When the device is muted, the signal is attenuated at the speaker and the outputs stop switching. To mute the MAX9736, drive MUTE low. Hold MUTE low during system power-up and power-down to ensure that clicks and pops caused by circuits before the MAX9736 are suppressed. EFFICIENCY vs. TOTAL OUTPUT POWER 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) CLASS AB MAX9736A MAX9736 fig01 100 Figure 1. MAX9736A Efficiency vs. Class AB Efficiency ______________________________________________________________________________________ 13 Mono/Stereo High-Power Class D Amplifier MAX9736 Click-and-Pop Suppression AMPLITUDE (dBμV/m) The MAX9736 features comprehensive click-and-pop suppression that minimizes audible transients on startup and shutdown. While in shutdown, the H-bridge is in a high-impedance state. 40 35 30 25 20 15 10 5 30 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) EN55022B LIMIT Mono Configuration The MAX9736 features a mono mode that allows the right and left channels to operate in parallel, achieving up to 30W (MAX9736A) of output power. Apply a logichigh to MONO to enable mono mode. In mono mode, an audio signal applied to the left channel (INL) is routed to the H-bridges of both channels. Also in mono mode, the right-channel preamplifier becomes an uncommitted operational amplifier, allowing for flexibility in system design. Connect OUTL+ to OUTR+ and OUTL- to OUTR- using heavy PCB traces as close as possible to the device. Driving MONO low (stereo mode) while the outputs are wired together in mono mode can trigger the short-circuit or thermal-overload protection or both. Figure 2. EMI Performance FB1 MAX9736 FB2 C1 330pF C2 330pF Current Limit When the output current reaches the current limit, 4.6A (typ), the MAX9736 disables the outputs and initiates a 450µs startup sequence. The shutdown and startup sequence is repeated until the output fault is removed. Properly designed applications do not enter currentlimit mode unless the output is short circuited or connected incorrectly. FB1 AND FB2 = WURTH 742792040 Figure 3. Ferrite Bead Filter Thermal Shutdown When the die temperature reaches the thermal shutdown threshold, +160°C (typ), the MAX9736 outputs are disabled. When the die temperature decreases by 30°C, normal operation resumes. Some causes of thermal shutdown are excessively low load impedance, poor thermal contact between the MAX9736‘s exposed pad and the PCB, elevated ambient temperature, or poor PCB layout and assembly. C2 C4 R1 L1 C1 MAX9736 L2 C3 C5 R2 Applications Information Filterless Class D Operation The MAX9736 meets EN55022B EMC radiation limits with an inexpensive ferrite bead and capacitor filter when the speaker leads are less than or equal to 1m. Select a ferrite bead with 100Ω to 600Ω impedance and rated for at least 2A. The capacitor value varies based on the ferrite bead chosen and the speaker lead length. See Figure 3 for the correct connections of these components. Figure 4. Output Filter for PWM Mode When evaluating the MAX9736 with a ferrite bead filter and resistive load, include a series inductor (68µH for 8Ω load and 33µH for 4Ω load) to model the actual loudspeaker’s behavior. Omitting the series inductor 14 ______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier MAX9736 Table 1. Suggested Values for LC Filter RL (Ω) 4 8 16 L1, L2 (µH) 10 15 33 C1 (µF) 0.47 0.15 0.10 C2, C3 (µF) 0.10 0.15 0.10 C4, C5 (µF) 0.22 0.15 0.10 R1, R2 (Ω) 10 15 33 reduces the efficiency, the THD+N performance, and the output power of the MAX9736. When evaluating with a load speaker, no series inductor is required. Inductor-Based Output Filters Some applications use the MAX9736 with a full inductor-/capacitor-based (LC) output filter. Select the PWM output mode for best audio performance. See Figure 4 for the correct connections of these components. The load impedance of the speaker determines the filter component selection (see Table 1). Inductors L1 and L2, and capacitor C1 form the primary output filter. Capacitors C2 and C3 provide commonmode filtering to reduce radiated emissions. Capacitors C4 and C5, plus resistors R1 and R2, form a Zobel at the output. A Zobel corrects the output loading to compensate for the rising impedance of the loudspeaker. Without a Zobel the filter exhibits a peak response near the cutoff frequency. Input Capacitor An input capacitor, CIN, in conjunction with the input resistor, RIN, of the MAX9736 forms a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to automatically 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 Choose CIN so that f-3dB is well below the lowest frequency of interest. Use capacitors whose dielectrics have low voltage coefficients. Capacitors with high-voltage coefficients cause increased distortion close to f-3dB. COM Capacitor COM is the output of the internally generated DC bias voltage. Bypass COM with a 1µF capacitor to AGND. Component Selection Gain-Setting Resistors External feedback resistors set the gain of the MAX9736. The output stage provides a fixed internal gain in addition to the externally set input stage gain. For the MAX9736A, the fixed output-stage gain is set at 17dB (7V/V). For the MAX9736B, the fixed output-stage gain is set at 13.6dB (4.8V/V). Set overall gain by using resistors RF and RIN (Figure 5) as follows: ⎛R ⎞ MAX9736A : A V = −7.1⎜ F ⎟ V / V ⎝ RIN ⎠ ⎛R ⎞ MAX9736B : A V = −4.8⎜ F ⎟ V / V ⎝ RIN ⎠ where A V is the desired voltage gain. Choose R F between 10kΩ and 50kΩ. The FB terminal is an op amp output and the IN terminal is the op amp inverting input, allowing the MAX9736 to be configured as a summing amplifier, a filter, or an equalizer. Power Supplies The MAX9736 features separate supplies for signal and power portions of the device, allowing for the optimum combination of headroom, power dissipation, and noise immunity. The speaker amplifiers are powered from PVDD and can range from 8V to 28V. The remainder of the MAX9736 is powered by VS. Power-Supply Sequencing During power-up and power-down, VS must not exceed PVDD. VS greater than PVDD will damage the device. RF AUDIO INPUT CIN RIN FB_ IN_ COM OUT_+ OUT_- CCOM MAX9736 Figure 5. Setting Gain ______________________________________________________________________________________ 15 Mono/Stereo High-Power Class D Amplifier MAX9736 Internal Regulator The MAX9736 features an internal 5V regulator, VS, powered from PVDD. Connect REGEN to SHDN so that the internal 5V regulator is enabled/disabled when the MAX9736 is enabled/disabled. If an external 5V supply is available, drive REGEN low and connect external 5V supply to VS to minimize the power dissipation of the MAX9736. Use wide, low-resistance output traces. Current drawn from the outputs increases as load impedance decreases. High-output trace resistance decreases the power delivered to the load. The MAX9736 TQFN package features an exposed thermal paddle on its underside. This paddle lowers the package’s thermal resistance by providing a heat conduction path from the die to the PCB. Connect the exposed thermal pad to PGND by using a large pad and multiple vias to the PGND plane. Supply Bypassing, Layout, and Grounding Proper layout and grounding are essential for optimum performance. Use wide traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance. Proper grounding improves audio performance, minimizes crosstalk between channels, and prevents switching noise from coupling into the audio signal. Connect PGND and AGND together at a single point on the PCB. Route all traces that carry switching transients away from AGND and the traces/components in the audio signal path. Bypass each PVDD pin with a 0.1µF capacitor to PGND. Place the bypass capacitors as close as possible to the MAX9736. Place a 220µF capacitor between PVDD and PGND. Bypass VS with a 1µF capacitor to AGND. 16 ______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Typical Application Circuit for Stereo Output Configuration 8V TO 28V MAX9736 0.1μF 0.1μF CBULK 220μF 1μF VS 16 PVDD 27, 30 C1P 22 C1 0.1μF C1N 21 REG 15 1μ F REGULATOR CHARGE PUMP 3 BOOT C2 1μF 20kΩ 20kΩ 470nF FBL 5 INL 6 31, 32 OUTL+ 1, 2 OUTL- COM 12 1μF BIAS POWER STAGE 20kΩ 470nF 20kΩ INR 18 FBR 19 REGEN 11 25, 26 OUTR+ 23, 24 OUTR- SHUTDOWN MUTE 5V SHDN 10 MUTE 9 CONTROL MOD 20 MONO 4 MAX9736 13, 14 AGND 28, 29 PGND 7, 8, 17 N.C. NOTE: PREAMPLIFIER GAIN SET AT 0dB. ______________________________________________________________________________________ 17 Mono/Stereo High-Power Class D Amplifier MAX9736 Typical Application Circuit for Single (Mono) Output Configuration 8V TO 28V 0.1μF 0.1μF CBULK 220μF 1μF VS 16 PVDD 27, 30 C1P 22 C1 0.1μF C1N 21 REG 15 1μ F LPF REGULATOR CHARGE PUMP 3 BOOT C2 1μF FBL 5 FBR INL 6 31, 32 OUTL+ 1, 2 OUTL- COM 12 1μF HPF BIAS POWER STAGE INR 18 AUDIO INPUT FBR 19 25, 26 OUTR+ 23, 24 OUTR- FBR REGEN 11 SHUTDOWN MUTE 5V MOD 20 MONO 4 13, 14 AGND 28, 29 PGND 7, 8, 17 N.C. SHDN 10 MUTE 9 MAX9736 CONTROL 18 ______________________________________________________________________________________ Mono/Stereo High-Power Class D Amplifier Pin Configuration PROCESS: BiCMOS OUTROUTRMOD C1N C1P N.C. Chip Information MAX9736 TOP VIEW FBR 19 24 OUTR+ 25 OUTR+ 26 PVDD 27 PGND 28 PGND 29 PVDD 30 OUTL+ 31 OUTL+ 32 1 OUTL- 23 22 21 20 18 INR 17 16 15 14 13 VS REG AGND AGND COM REGEN SHDN MUTE MAX9736 12 11 + 2 OUTL- EP* 10 9 3 BOOT 4 MONO 5 FBL 6 INL 7 N.C. 8 N.C. TQFN-EP (7mm × 7mm × 0.8mm) EP* = EXPOSED PAD, CONNECT TO PGND. ______________________________________________________________________________________ 19 Mono/Stereo High-Power Class D Amplifier MAX9736 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 32 TQFN-EP PACKAGE CODE T3277-3 DOCUMENT NO. 21-0144 20 ______________________________________________________________________________________ 32, 44, 48L QFN.EPS Mono/Stereo High-Power Class D Amplifier Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. MAX9736 ______________________________________________________________________________________ 21 Mono/Stereo High-Power Class D Amplifier MAX9736 Revision History REVISION NUMBER 0 1 REVISION DATE 1/08 12/08 Initial release Corrected various errors DESCRIPTION PAGES CHANGED — 1–15, 17–21 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. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.