AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY KEY FEATURES DESCRIPTION A complete audio amplifier module is available to quickly evaluate the LX1721 or LX1722 stereo controller. Simply connect the amplifier to the power source, audio signal, and speakers. Reference designs support a variety of requirements including multi channel systems, subwoofers, satellite / subwoofer combinations and various speaker loads (2Ω, 4Ω, 8Ω). The versatile amplifier solution can easily be adjusted for frequency response, optimized for efficiency and performance, or designed to minimize PCB area and component count. The LX1721/1722 is available in a space saving 44-pin QSOP package. (Continued Next Page) IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT ! Integrated Switching Class-D Stereo Controller IC ! Full 20Hz-20kHz Audio Bandwidth ! High Fidelity (LX1721) Or High Power (LX1722) Versions Available ! Single Supply Operation ! THD+N <0.06% Typical (1Wrms, 1kHz, 4Ω) ! Maximum Efficiency 80%85% ! Output Power >60Wrms per Channel (LX1722, 4Ω, 1% THD+N) ! PSRR –70dB Typical ! Differential Input To Minimize Noise Effects ! Supports Multi-Channel Systems ! Complete LXE1721or LXE1722 Amplifier Evaluation Module Available ! 44-Pin QSOP Package W W W. Microsemi .COM The LX1721/1722 is a monolithic high performance Class-D stereo controller IC designed for high efficiency or space constrained audio requirements such as portable or battery operated products, automotive amplifiers, and multi-channel multimedia computer and video game applications. This high frequency, full audio bandwidth switching power amplifier controller offers dramatically improved performance over Linfinity’s previous generation amplifier products. Enhancements include higher output power, better SNR, lower noise floor, and reduced THD. Combined with output power MOSFET’s and an output filter, the LX1721/1722 is a complete Class-D audio solution. 7V - 25V Channel 1 IN + IN - FETs Left FETs Right Output Power vs. Supply Voltage 1kHz, 4Ω, THD+N=1% LX1722 Stereo Channel 2 IN + IN - 2Ω, 4Ω, 8Ω CLOCK LX1711 Channel 3 Mono FETs IN + IN - Subwoofer 2.1 Audio Amplifier Configuration APPLICATIONS ! Multimedia Speakers ! Surround Sound Game Systems ! Notebook Computers ! Desktop Computers ! Automotive Amplifiers And Head units ! Battery Operated Equipment (Megaphone, Public Address System) ! Portable Audio (Boom Box) ! Wireless Speakers ! High Power Subwoofer ! Automotive Audio Systems ! Home Theatre LX1721 / 22 PACKAGE ORDER INFO TJ (°°C) VDD 0 to 70 0 to 70 7V – 15V 7V – 25V DB Plastic QSOP 44-Pin LX1721CDB LX1722CDB Note: Available in Tape & Reel. Append the letter “T” to the part number. (i.e. LX1722CDBT) Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY PACKAGE PIN OUT DB 44-PIN QSSOP PACKAGE THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA LFAOUT 50°°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 1 44 LFBK- CPWM LFBK+ RPWM LISN LMUTE VDD LEAOUT CN LEAIN PVDD VREF PGND CLOCK LN+ GND LP+ V25 LP- LIN+ LN- LIN- RN- LAMPOUT RP- RIN+ RP+ RIN- RN+ RAMPOUT PGND SLEEP CP STATUS PVDD RMUTE NC REAIN RISN REAOUT RFAOUT W W W. Microsemi .COM THERMAL DATA RFBK+ 22 23 RFBK- DB PACKAGE (Top View) DESCRIPTION (CONTINUTED) The stereo output controller is available in either an LX1722 high power version (>65Wrms, 4Ω) with a supply voltage range of 7V-25V or an LX1721 high fidelity version (better SNR performance) with a supply voltage range of 7V-15V. The current rating of the external MOSFET’s, the available supply voltage, and speaker load primarily limits the maximum output power. The amplifier provides high fidelity performance and is designed to operate over the full 20Hz to 20kHz audio band. Signal distortion measurements yield THD+N levels of 0.06%(1kHz, 1Wrms). Efficiency is greater than 80% typical, which eliminates the need for heatsinks in most applications. The AudioMAX™ solution requires a single supply voltage, simplifying input power requirements where a dual supply may not be available. To minimize potential environmental noise issues and ease the integration of the amplifier into a variety of applications, features such as a balanced/differential audio input and a high power supply rejection ratio help reduce the effects of noise from the audio signal or power supply. PACKAGE DATA Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY PIN NAME DESCRIPTION PIN NAME Left Feedback Amplifier Output LFBK- PWM Capacitor Connection LFBK+ RPWM LMUTE LEAOUT LEAIN VREF PWM Resistor Connection Left Mute Input (Active High) Left Error Amplifier Output Left Inverting Input of Error Amplifier 5V Reference LISN VDD CN PVDD PGND CLOCK Input / Output Clock for Synch Operation LN+ GND Low Current Ground LP+ V25 2.5V Reference LP- LIN+ Left Positive Audio Input LN- LIN- Left Negative Audio Input RN- LAMPOUT Left Input Amplifier Output RP- RIN+ Right Positive Audio Input RP+ RIN- Right Negative Audio Input RN+ LFAOUT CPWM SLEEP STATUS RMUTE REAIN Right Input Amplifier Output Sleep Input (active low) UVLO Indicator (Open Collector Output) Right Mute Input (Active High) Right Inverting Input of Error Amplifier PGND CP PVDD NC RISN REAOUT Right Error Amplifier Output RFBK+ RFAOUT Right Feedback Amplifier Output RFBK- RAMPOUT W W W. Microsemi .COM FUNCTIONAL PIN DESCRIPTION DESCRIPTION Left Feedback Amplifier Inverting Input Left Feedback Amplifier Non-Inverting Input Left Current Limit Sense Input Analog Supply Voltage Supply Decoupling for NFET Drivers Output Driver Supply Voltage Output Driver High Current Ground Left Drive for NFET on Positive Half of Bridge Left Drive for PFET on Positive Half of Bridge Left Drive for PFET on Negative Half of Bridge Left Drive for NFET on Negative Half of Bridge Right Drive for NFET on Negative Half of Bridge Right Drive for PFET on Negative Half of Bridge Right Drive for PFET on Positive Half of Bridge Right Drive for NFET on Positive Half of Bridge Output Driver High Current Ground Supply Decoupling for PFET Drivers Output Driver Supply Voltage No Connect Right Current Limit Sense Input Left Feedback Amplifier Non-Inverting Input Right Feedback Amplifier Inverting Input ABSOLUTE MAXIMUM RATINGS Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into negative out of the specified terminal. Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 PACKAGE DATA Supply Voltage (PVDD, VDD)..............................................................................................................................-0.3V to 30V SLEEP , STATUS, R/LFBK+, R/LFBK-................................................................................................. -0.3V to VDD +0.3V R/LISN......................................................................................................................................... PVDD –2 to PVDD to +0.3V RPWM, CPWM, R/LMUTE....................................................................................................................-0.3V to VREF +0.3V R/LIN+, R/LIN-, R/LAMPOUT ..............................................................................................................-0.3V to VREF +0.3V R/LEAIN, R/LEAOUT, R/LFAOUT......................................................................................................-0.3V to VREF + 0.3V CLOCK ........................................................................................................................................................ -0.3V to CN +0.3V Operating Junction Temperature Plastic ...........................................................................................................................125°C Storage Temperature Range............................................................................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds).......................................................................................................................300°C AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY Parameter Symbol Test Conditions Min LX1721 / 1722 Typ Max Units Evaluation Module (See Figure 2) Supply Voltage LX1721 LX1722 Power Supply Rejection Ratio Output Power (Per Channel) VDD PSRR PO Efficiency Total Harmonic Distortion Plus Noise Signal-To-Noise Ratio THD+N SNR 7 15 7 25 VIN = 15V, VRIPPLE = 1VRMS, 20Hz to 20kHz VIN = 15V, RL=4Ω, THD+N=1%, 10Hz to 22kHz VIN = 25V, RL=4Ω, THD+N=1%, 10Hz to 22kHz VIN = 15V, fIN = 1kHz, PO = 10W -70 V dB 25 W W W. Microsemi .COM ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C < TA < 70°C. Test conditions: RPWM = 34.8k, CPWM = 100pF, VDD = PVDD = 15V W 60 82 VIN = 15V, fIN = 1kHz, PO = 20W 85 fIN = 1kHz, PO = 1W .06 fIN = 20Hz to 20kHz, PO = 1W % .2 RL = 4Ω, PO = 1W % 81 dBr 335 kHz Oscillator Section Oscillator Frequency FOSC Charge Current ICHG (varies with VDD pin voltage) -110 µA Discharge Current IDIS (varies with VDD pin voltage) 110 µA Oscillator Peak Voltage VPK (varies with VDD pin voltage) 3.4 V Oscillator Valley Voltage VVAL Voltage Stability (varies with VDD pin voltage) 1.6 VDD = 8V to 25V 0.6 2 % 1.0 2 % TA = 0OC to 70OC Temperature Stability O O TA = -40 C to 125 C V 1.5 % ‘mV Error Amplifier Input Offset Voltage VIO 5 DC Open Loop Gain AOL 60 dB Unity Gain Bandwidth UGBW 7 ‘mHz High Output Voltage VOH IOUT = -100µA Low Output Voltage VOL IOUT = +100µA 50 ‘mV VIN = 1V to VREF 1 µA 3.535 V/V VREF –1 V Input Common Mode Range Input Bias Current IIN Stage Gain Set by Internal Resistors 3.465 Output Voltage, High VOH IOUT = -100µA 3.85 Output Voltage, Low VOL IOUT = +100µA Input Impedance Copyright 2000 Rev. 0.1b,2001-09-19 3.5 V 1.3 42 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ‘mV ‘kΩ Page 4 ELECTRICALS Input Amplifier AudioMAX™ L I N F I N I T Y D I V I S I O N LX1721 / 1722 Class-D Stereo Power Amplifier Controller P RELIMINARY Units Feedback Amplifier Stage Gain LX1721 LX1722 Set by Internal Resistors Set by Internal Resistors 89 56 91 57 388 93 58 190 210 500 250 230 mV ‘ns ‘ns 4 4 4 ‘cycles 2 2 2 ‘cycles ± 50 5 10 ‘mV ‘mV ‘mV ‘mV ‘mV Input Impedance Current Limit Comparator Voltage Sense Threshold Blanking Pulse Delay Response Time IUM Pulses required to Current Limit Latch Consecutive Clear Pulses required to reset IUM counter Reference Voltage Section Excluding blanking pulse Initial Accuracy Voltage Stability 5.000 ± 25 2 4 0.5 5 TA = 0OC to 70OC TA = -40OC to 125OC VDD = 9V to 15V IOUT = 0 to 20mA Temperature Stability Line Regulation Load Regulation Under voltage Lockout Section Start Threshold Voltage UV Lockout Hysteresis UVLO Delay To Output Enable Supply Current 0.5 Operating Current V V clkcyc 25 µA 5.0 ‘mV 1.2 62,500 1.45 1.6 clkcyc V 1.6 1.7 1.8 V ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CN = 5.2V applied externally ISOURCE = 75mA, CN = 5.2V applied externally 30 1.5 100 2.0 ‘mV V 30 100 ‘mV 1.5 2.0 V ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CP = 5.2V (applied externally) ISOURCE = 75mA, CP = 5.2V (applied externally) 30 1 100 1.5 ‘mV V 30 100 ‘mV 1 1.5 V Mute Threshold Output Drivers for N-Channel MOSFETs VOL NFET Drivers, High Level Voltage VOH Output Drives For P-Channel MOSFETs PFET Drivers, Low Level Voltage VOL PFET Drivers, High Level Voltage VOH Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 ELECTRICALS 2.9 Sleep to Output Enable Sleep Threshold Mute Section NFET Drivers, Low Level Voltage kΩ 6.5 6.5 62,500 SLEEP Input = 0V, TA = 25OC SLEEP Input = 2V, VIN = 15V, No MOSFETs connected Sleep Current ‘mV/V ‘mV/V W W W. Microsemi .COM Parameter ELECTRICAL CHARACTERISTICS (CONTINUED) LX1721 / 1722 Symbol Test Conditions Min Typ Max AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY 10 SLEEP VDD 25 PVDD LISN 27 CLOCK 28 RPWM 5 CPWM 6 W W W. Microsemi .COM BLOCK DIAGRAM + - SYNC OSC UVLO & REFERENCE 5V Reference 220mV 1 VREF 4 V25 24 CN CLK 24 PVDD 5V Reference CURRENT SENSE 26 CP LEAOUT 14 23 LP+ LEAIN 13 LAMPOUT FAULT TIMER ERROR AMP 9 LIN- 8 LIN+ 7 OUTPUT DRIVERS & LOGIC CLK S Q R Q 22 LN+ 21 LN20 LP- 15 LFAOUT MUTE MUX INPUT AMP 17 LFBK- MUTE 16 LFBK+ 2.5V FEEDBACK AMP LMUTE 11 2.5V FIGURE 1 – LX1721 / 22 SIMPLIFIED BLOCK DIAGRAM (LEFT CHANNEL CIRCUIT SHOWN) BLOCK DIAGRAM Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY Frequency Synchronization Two or more LX1721 / LX1722 oscillators can be configured for synchronous operation. One unit, the master, is programmed for the desired frequency with the RPWM and CPWM as usual. Additional units will be slave units, and their oscillators will be disabled by leaving the RPWM pin disconnected. The CLOCK pin and the CPWM pin of the slave units should be tied to the CLOCK pin and the CPWM pin of the master unit respectively. In this configuration, the CLOCK pins of the slave units begin receiving instead of transmitting clock pulses. Also, the CPWM pins quit driving the PWM capacitor in the slave units. Note that for optimum performance, all slave units should be located within a few inches of the master unit. Oscillator Configuration (RPWM and CPWM selection) The oscillator is programmed by the external timing components RPWM and CPWM. For a nominal frequency of 333kHz, RPWM and CPWM should be set to 49.9kOhms and 100pF respectively. Note that in order to keep the slope of the PWM ramp voltage proportional to the supply voltage, both the ramp peak and valley voltages, and the charge and discharge currents are proportional to the supply voltage. This keeps the frequency relatively constant while keeping the slope of the PWM ramp proportional to the voltage on the VDD pin. For operating frequencies other than 333kHz, the frequency can be approximated by the following equation: Frequency = W W W. Microsemi .COM APPLICATION INFORMATION 1 (0.577)( RPWM )(CPWM ) + 320ns APPLICATION Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY 100 dx=-18.20 W dy=-0.17812 % FIGURE 2 – THD+N VS. OUTPUT POWER 50 20 10 5 VIN = 15V fIN = 1kHz RL = 4Ω 2 1 THD+N (%) 0.5 0.24563 0.2 0.1 0.06751 0.05 0.02 0.01 W W W. Microsemi .COM CHARACTERISTIC CURVES 0.005 0.002 0.001 100m 200m 500m .91611 2 5 10 19.12 20 50 100 Output Power (W) 100 dx=58.73 W dy=0.47633 % FIGURE 3 – THD+N VS. OUTPUT POWER 50 20 10 5 VIN = 25V fIN = 1kHz RL = 4Ω 2 1 THD+N (%) 0.5 0.53924 0.2 0.1 0.0629 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 1.225 2 5 10 5059.95 20 100 Output Power (W) 100 dx=-36.99 W dy=-0.22386 % FIGURE 4 – THD+N VS. OUTPUT POWER 50 20 10 5 2 VIN = 15V fIN = 1kHz RL = 2Ω 1 THD+N (%) 0.5 0.26783 0.2 0.1 GRAPHS 0.05 0.04397 0.02 0.01 0.005 0.002 0.001 100m Copyright 2000 Rev. 0.1b,2001-09-19 200m 500m 1 1.252 2 5 Output Power (W) 10 20 38.24 50 100 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY dx=108.8 100 W FIGURE 5 – THD+N VS. OUTPUT POWER dy=0.48800 % 50 20 10 5 2 VIN = 25V fIN = 1kHz RL = 2Ω THD+N(%) 1 0.5 0.53924 0.2 0.1 0.05 0.05123 0.02 0.01 W W W. Microsemi .COM CHARACTERISTIC CURVES (CONTINUED) 0.005 0.002 0.001 100m 200m 500m 1.136 1 2 5 10 20 50 109.9 100 200 300 Output Power (W) 100 dx=-4.8988 kHz dy=-0.17080 % FIGURE 6 – THD+N VS. FREQUENCY 50 20 10 5 2 VIN = 15V RL = 4Ω PO = 1W RMS 1 THD+N (%) 0.5 0.2 0.19402 0.1 0.05 0.02322 0.02 0.01 0.005 0.002 0.001 20 50 100126.2 200 500 1k 2k 5.025k 5k 10k 20k Frequency (Hz) 100 dx=-4.8988 kHz dy=-0.11937 % FIGURE 7 – THD+N VS. FREQUENCY 50 20 10 5 2 VIN = 25V RL = 4Ω PO = 1W RMS 1 THD+N (%) 0.5 0.2 0.1798 0.1 0.06044 0.05 GRAPHS 0.02 0.01 0.005 0.002 0.001 20 50 100126.2 200 500 1k 2k 5.025k 5k 10k 20k Frequency (Hz) Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY +10 dx=-17.869 kHz dy=-0.155 dB W W W. Microsemi .COM CHARACTERISTIC CURVES (CONTINUED) FIGURE 8 – FREQUENCY RESPONSE +8 +6 Voltage Amplification (dBr) +4 VIN = 15V RL = 4Ω PO = 1W RMS +2 +0 -0.965 -1.119 -2 -4 -6 -8 -10 10 18.220 50 dx=-17.869 kHz +10 100 200 500 1k 2k Frequency (Hz) 5k 10k 17.8875k 20k 50k 80k dy=+0.170 dB FIGURE 9 – FREQUENCY RESPONSE +8 +6 Voltage Amplification (dBr) +4 VIN = 25V RL = 4Ω PO = 1W RMS +2 +0 -1.436 -1.606 -2 -4 -6 -8 -10 10 18.220 50 100 200 500 1k 2k 5k 10k 17.8875k 20k 50k 80k Frequency (Hz) +10 dx=-2.9880 kHz dy=+3.205 dB FIGURE 10 – NOISE FLOOR FFT +0 -10 -20 -30 -40 VIN = 15V RL = 4Ω 10Hz – 22kHz Bandwidth A-weighted dBV -50 -60 -70 -80 -90 -94.916 -100 -98.12 GRAPHS -110 -120 -130 -140 -150 20 50 100 200 500 .973932k 1k 2k 3.96192k 5k 10k 20k Frequency (Hz) Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY CHARACTERISTIC CURVES (CONTINUED) dx=-2.9880 kHz dy=-1.969 dB W W W. Microsemi .COM +10 FIGURE 11 – NOISE FLOOR FFT +0 -10 -20 -30 -40 -50 VIN = 25V RL = 4Ω 10Hz – 22kHz Bandwidth A-Weighted dBV -60 -70 -80 -90 -94.11 -96.079 -100 -110 -120 -130 -140 -150 20 50 100 200 .973932k 1k 500 2k 3.96192k5k 10k 20k Frequency (Hz) FIGURE 12 – EFFICIENCY VS. OUTPUT POWER 90% 85% Efficency (%) 80% 75% 70% VIN = 15V fIN = 1kHz 65% 60% 55% 50% 45% 0 5 10 15 20 25 30 Output Power (W) 8Ω 4Ω 2Ω FIGURE 13 – POWER SUPPLY REJECTION RATIO (PSSR) Power Supply Rejection Ratio (PSRR) 0 -10 -30 PO = 1W RMS RL = 4Ω -40 -50 GRAPHS Amplitude (dB) -20 -60 -70 -80 -90 -100 10 100 1000 10000 100000 Frequency (Hz) 15V+1,Left Copyright 2000 Rev. 0.1b,2001-09-19 15V+1,Right 15V-1,Left 15V-1,Right Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY LISN R16 Q1 LFBK+ R8 24.3K 1% C25 220pF 5.1/1W JP1 Vcc Vcc 2 1 PGND Teminal 2 Vcc Vcc PGND + C1 1000µF 25V L1 Vcc R6 0.020/1W C2 0.1uF/25V OUTL+ LISN R9 5.1/1W 15uH Q2 C29 0.68uF/50V LFBKLFBK+ PGND R10 U1 C7 1 100pF 2 3 GND C9 18pF R5 34.8k 1% 4 5 R2 56.2k 1% C10 150pF 6 7 + C13 1uF/10V,TANT 8 9 C14 0.1uF/25V LIN+ LIN- RIN+ RIN- C3 LIN+ 10 0.47uF 11 LIN- 12 C4 0.47uF C5 0.47uF RIN+ 13 14 RINC6 15 0.47uF 16 17 18 19 _MUTE R4 56.2k 1% C12150pF 20 21 22 LFBK- CPWM LFBK+ RPWM LISN _LMUTE LEAOUT VDD CN LEAIN PVDD VREF PGND CLOCK LN+ GND LP+ V25 LP- LIN+ LN- LIN- RN- LAMPOUT RP- RIN+ RP+ RIN- RN+ RAMPOUT SLEEP PGND CP STATUS PVDD _RMUTE NC REAIN RISN REAOUT RFBK+ RFAOUT RFBK- 44 43 42 41 40 39 38 C16 0.1uF/25V LN+ 36 LP+ 35 LP- 34 LN- 33 RN- 32 RP- 31 RP+ 30 RN+ 28 27 26 25 C30 0.68uF/50V 5.1/1W OUTL15uH R17 R11 5.1/1W LFBKQ4 24.3K 1% R18 RFBK- R12 24.3K 1% PGND C20 4.7uF/25V,TANT L3 C21 47uF/25V C22 0.1uF/25V OUTRR13 15uH Vcc 24 5.1/1W 23 C27 220pF 5.1/1W Q6 C32 0.68uF/50V R21 15/1W PGND LX1721-01CDB 10k C26 220pF Q5 C11 18pF R3 C31 0.47uF/50V L2 PGND C17 4.7uF/25V,TANT Vcc C18 +47uF/25V C19 PGND 0.1uF/25V 37 29 C15 10uF/25V + + SLEEP Q3 Vcc LFAOUT + 10k + R1 R20 15/1W W W W. Microsemi .COM APPLICATION R14 Q7 RFBK+ RFBK- C33 0.68uF/50V 5.1/1W C34 0.47uF/50V L4 OUTR+ 15uH R19 R15 R7 0.020/1W APPLICATION Vcc Vcc RFBK+ RISN Q8 24.3K 1% 5.1/1W C28 220pF RISN GND PGND FIGURE 14 – TYPICAL CLASS-D STEREO SWITCHING AMPLIFIER CIRCUIT APPLICATION Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 12 AudioMAX™ L I N F I N I T Y LX1721 / 1722 Class-D Stereo Power Amplifier Controller D I V I S I O N P RELIMINARY DB 44-Pin Quarter Size Outline Package (QSOP) 44 Dim 23 A B C D E F G L M P R ZD *LC R E 1 P 22 B F ZD D E Note: INCHES MIN MAX 0.096 0.104 0.011 0.020 0.091 0.0125 0.698 0.706 0.291 0.299 0.0315 BSC 0.004 0.012 0.016 0.050 0° 8° 0.396 0.414 0.025 0.035 0.033 REF 0.004 * Lead Coplanarity A G MILLIMETERS MIN MAX 2.44 2.64 0.28 0.51 0.23 0.32 17.73 17.93 7.40 7.60 0.80 BSC 0.10 0.30 0.40 1.27 0° 8° 10.11 10.51 0.63 0.89 0.51 REF 0.10 W W W. Microsemi .COM MECHANICAL DIMINSIONS C L M Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006”) on any side. Lead dimension shall not include solder coverage. MECHANICALS Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 13 AudioMAX™ L I N F I N I T Y D I V I S I O N LX1721 / 1722 Class-D Stereo Power Amplifier Controller P RELIMINARY W W W. Microsemi .COM NOTES NOTES Preliminary Data – Information contained in this document is pre-production data and is proprietary to LinFinity. It may not be modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only and LinFinity reserves the right to change or discontinue this proposed product at any time. Copyright 2000 Rev. 0.1b,2001-09-19 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 14