9-3108; Rev 3; 9/09 KIT ATION EVALU E L B AVAILA Mono/Stereo High-Power Class D Amplifier The MAX9736A/B/D Class D amplifiers provide highperformance, thermally efficient amplifier solutions. The MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W into a 4Ω load. The MAX9736B/D deliver 2 x 6W into 8Ω loads or 1 x 12W into a 4Ω load. These 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.
MAX9736 Mono/Stereo High-Power Class D Amplifier ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN 5mm x 5mm Multiple Layer PCB (derate 34.5mW/°C above +70°C) ..................................2.76W θJA .................................................................................29°C/W θJC ...................................................................................
Mono/Stereo High-Power Class D Amplifier (VPVDD = 20V, VVS = 5V, VAGND = VPGND = 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 SYMBOL CONDITIONS MIN TYP MAX UNITS Input Amplifier Slew Rate 2.5 V/μs Input Amplifier Unity-Gain Bandwidth 3.
MAX9736 Mono/Stereo High-Power Class D Amplifier ELECTRICAL CHARACTERISTICS (continued) (VPVDD = 20V, VVS = 5V, VAGND = VPGND = 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.
Mono/Stereo High-Power Class D Amplifier (VPVDD = 20V, VVS = 5V, VAGND = VPGND = 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 SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INTERFACE Input Voltage High VINH Input Voltage Low VINL Input Voltage Hysteresis Input Leakage Current 2 V 0.
Typical Operating Characteristics (MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) 1 0.1 0.1 THD+N (%) POUT = 5W THD+N (%) POUT = 3W POUT = 3W 0.001 0.001 1k 10k 0.001 10 100k 100 1k 100k 10k 10k 100k FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs.
Mono/Stereo High-Power Class D Amplifier VPVDD = 12V, FIXED FREQUENCY, 4Ω LOAD 1 10 VPVDD = 12V, SPREAD SPECTRUM, 4Ω LOAD 1 1 THD+N (%) 0.1 0.1 20Hz 1kHz 6kHz 0.1 1kHz 20Hz 0.01 20Hz 0.01 0.001 0.01 0.001 2 0 4 6 8 10 12 14 16 18 0.
Typical Operating Characteristics (continued) (MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) EFFICIENCY vs. TOTAL OUTPUT POWER 60 80 6 POWER DISSIPATION 5 7 60 6 EFFICIENCY 50 5 40 4 3 20 2 20 2 10 1 10 1 0 0 0 5 10 15 20 25 30 30 0 0 5 10 15 20 25 TOTAL OUTPUT POWER (W) EFFICIENCY vs. TOTAL OUTPUT POWER EFFICIENCY vs.
Mono/Stereo High-Power Class D Amplifier POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -20 30 15 CROSSTALK (dB) 10% THD+N -40 -50 -60 10 0 -90 15 20 25 30 LEFT TO RIGHT -120 10 100 LOAD RESISTANCE (Ω) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 10 0.1 20Hz 2 4 6 8 10 12 14 16 18 20 -40 -60 -80 -40 -60 -80 -120 0 5 10 0.
Typical Operating Characteristics (continued) (MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE 20 10 MAX9736 toc34 15 15 VREGEN = 0V, VMUTE = VSHDN = 3.3V 13 10 11 9 5 0 7 5 0 13 18 8 28 23 13 18 23 4.5 28 4.7 4.9 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY SHUTDOWN CURRENT vs.
Mono/Stereo High-Power Class D Amplifier VPVDD = 18V, FIXED FREQUENCY, 4Ω LOAD, MONO VPVDD = 18V, SPREAD SPECTRUM, 4Ω LOAD, MONO 10 1 0.1 THD+N (%) 6kHz 6kHz 1kHz 0.1 1kHz 10 15 20 25 30 1kHz 20Hz 20Hz 0.01 5 6kHz 0.1 20Hz 0.01 0 VPVDD = 24V, FIXED FREQUENCY, 4Ω LOAD, MONO 1 THD+N (%) THD+N (%) 1 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 35 0.01 0 OUTPUT POWER (W) 5 10 15 20 25 30 35 0 5 OUTPUT POWER (W) 0.
Typical Operating Characteristics (continued) (MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.) 14 12 10 8 10% THD+N 6 30 25 20 10% THD+N 15 VPVDD = 24V, MONO, SPREAD SPECTRUM 35 MAX9736 toc50 35 40 MAX9736 toc49 VPVDD = 18V, MONO, SPREAD SPECTRUM OUTPUT POWER (W) OUTPUT POWER (W) 16 40 OUTPUT POWER (W) VPVDD = 12V, MONO, SPREAD SPECTRUM MAX9736 toc48 20 18 OUTPUT POWER vs.
Mono/Stereo High-Power Class D Amplifier PIN NAME FUNCTION 1, 2 OUTL- Left-Channel Negative Speaker Output 3 BOOT Charge-Pump Output. Connect a 1μF charge-pump holding capacitor from BOOT to PVDD. 4 MONO Mono Select. Set MONO high for mono mode, low for stereo mode. 5 FBL Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain. 6 INL Stereo Left-Channel Inverting Input. In mono mode, INL is the inverting audio input for the mono amplifier. 7, 8, 17 N.C.
The MAX9736A/B/D 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/D output 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).
Mono/Stereo High-Power Class D Amplifier 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.
MAX9736 Mono/Stereo High-Power Class D Amplifier Table 1. Suggested Values for LC Filter RL (Ω) L1, L2 (µH) C1 (µF) C2, C3 (µF) C4, C5 (µF) R1, R2 (Ω) 4 10 0.47 0.10 0.22 10 8 15 0.15 0.15 0.15 15 16 33 0.10 0.10 0.10 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.
Mono/Stereo High-Power Class D Amplifier Supply Bypassing, Layout, and Grounding 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.
Mono/Stereo High-Power Class D Amplifier MAX9736 Typical Application Circuit for Stereo Output Configuration 8V TO 28V 0.1μF CBULK 220μF 0.1μF C1 0.
Mono/Stereo High-Power Class D Amplifier 8V TO 28V 0.1μF CBULK 220μF 0.1μF C1 0.1μF C2 1μF (16V) 1μF REG 15 VS PVDD C1P 16 27, 30 22 REGULATOR C1N 21 3 BOOT CHARGE PUMP 1μF LPF FBL 5 FBR 31, 32 OUTL+ INL 6 1, 2 OUTL- COM 12 BIAS POWER STAGE 1μF HPF 25, 26 OUTR+ INR 18 AUDIO INPUT 23, 24 OUTR- FBR 19 FBR REGEN 11 SHDN 10 SHUTDOWN MUTE MUTE 9 MAX9736 CONTROL 5V MOD 20 MONO 4 13, 14 AGND 28, 29 PGND 7, 8, 17 N.C.
Mono/Stereo High-Power Class D Amplifier C1P C1N MOD FBR INR N.C. 24 23 22 21 20 19 18 17 OUTR+ 25 16 VS OUTR+ 26 15 REG PVDD 27 14 AGND PGND 28 13 AGND 12 COM MAX9736 PGND 29 PVDD 30 OUTL+ 31 EP* + Ordering Information (continued) PART OUTR- TOP VIEW OUTR- MAX9736 Pin Configuration 6 7 8 N.C. BOOT 5 N.C.
Mono/Stereo High-Power Class D Amplifier PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 32 TQFN-EP (7mm x 7mm) T3277-3 21-0144 32 TQFN-EP (5mm x 5mm) T3255-4 21-0140 ______________________________________________________________________________________ 21 MAX9736 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9736 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.
Mono/Stereo High-Power Class D Amplifier QFN THIN.EPS ______________________________________________________________________________________ 23 MAX9736 Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9736 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.
Mono/Stereo High-Power Class D Amplifier REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 1/08 Initial release 1 12/08 Corrected various errors — 2 8/09 Added MAX9736D and automotive parts numbers and updated the Absolute Maximum Ratings section 1, 2, 3, 4,13, 15, 19, 20, 21 3 9/09 Corrected error in Absolute Maximum Ratings, Pin Description, Typical Application Circuit for Stereo Output Configuration, and Typical Application Circuit for Single (Mono) Output Configuration 2, 12, 1