LM4665 LM4665 Filterless High Efficiency 1W Switching Audio Amplifier Literature Number: SNAS146D LM4665 Filterless High Efficiency 1W Switching Audio Amplifier General Description Key Specifications The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4665 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8 transducer loads at a continuous average output of 400mW with less than 2%THD+N. The LM4665 has high efficiency with an 8 transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW output power. The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either a logic high or low depending on the mode selection. Connecting the Shutdown Mode pin to either VDD (high) or GND (low) enables the Shutdown pin to be driven in a likewise manner to activate shutdown. The LM4665 has fixed selectable gain of either 6dB or 12dB. The LM4665 has short circuit protection against a short from the outputs to VDD, GND or across the outputs. j Efficiency at 100mW into 8 transducer 75%(typ) j Efficiency at 400mW into 8 transducer 80%(typ) j Total quiescent power supply current (3V) 3mA(typ) j Total shutdown power supply current (3V) 0.01A(typ) j Single supply range (MSOP & LD) 2.7V to 5.5V j Single supply range (ITL) (Note 11) 2.7V to 3.8V Features n n n n n n n n n No output filter required for inductive transducers Selectable gain of 6dB (2V/V) or 12dB (4V/V) Very fast turn on time: 5ms (typ) User selectable shutdown High or Low logic level Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Short circuit protection micro SMD, LLP, and MSOP packages (no heat sink required) Applications n Mobile phones n PDAs n Portable electronic devices Typical Application 20027001 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer (R) is a registered trademark of National Semiconductor Corporation. (c) 2002 National Semiconductor Corporation DS200270 www.national.com LM4665 Filterless High Efficiency 1W Switching Audio Amplifier December 2002 LM4665 Connection Diagrams Mini Small Outline (MSOP) Package 9 Bump micro SMD Package 20027023 Top View Order Number LM4665MM See NS Package Number MUB10A 20027036 Top View Order Number LM4665ITL, LM4665ITLX See NS Package Number TLA09AAA LLP Package MSOP Marking 200270C5 Top View G - Boomer Family C5 - LM4665MM 200270D0 Top View Order Number LM4665LD See NS Package Number LDA10B micro SMD Marking 200270C6 Top View X - Date Code T- Die Traceability G - Boomer Family A2 - LM4665ITL www.national.com 200270C9 Top View Z - Plant Code XY - Date Code TT- Die Traceability Bottom Line-Part Number 2 JC (MSOP) (Notes 1, 56C/W JA (micro SMD) 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 1) 12C/W See AN-1112 "microSMD Wafers Level Chip Scale Package." -65C to +150C Voltage at Any Input Pin 63C/W JC (LLP) (Note 10) Soldering Information 6.0V Storage Temperature 180C/W JA (LLP) (Note 10) VDD + 0.3V V GND - 0.3V Power Dissipation (Note 3) Internally Limited ESD Susceptibility (Note 4) 2.0kV ESD Susceptibility (Note 5) 200V Junction Temperature (TJ) 150C Operating Ratings (Note 2) Temperature Range TMIN TA TMAX Thermal Resistance JA (MSOP) 190C/W -40C TA 85C Supply Voltage (MSOP & LD) 2.7V VDD 5.5V Supply Voltage (ITL) (Note11) 2.7V VDD 3.8V Electrical Characteristics VDD = 5V (Notes 1, 2, 11) The following specifications apply for VDD = 5V, RL = 8 + 33H, measurement bandwidth is < 10Hz - 22kHz unless otherwise specified. Limits apply for TA = 25C. LM4665 Symbol Parameter IDD Quiescent Power Supply Current Conditions Typical Limit (Note 6) (Notes 7, 8) VIN = 0V, No Load VIN = 0V, 8 + 22H Load 14 14.5 ISD Shutdown Current VSD = VSD VSDIH Shutdown Voltage Input High VSD VSDIL Shutdown Voltage Input Low VSDIH Shutdown Voltage Input High VSDIL Shutdown Voltage Input Low VSD VGSIH mA mA 0.1 5.0 A (max) Mode = VDD 1.2 1.4 V (min) VSD Mode = VDD 1.1 0.4 V (max) VSD Mode = GND 1.2 1.4 V (min) Mode = GND 1.1 0.4 V (max) Gain Select Input High 1.2 1.4 V (min) VGSIL Gain Select Input Low 1.1 0.4 V (max) AV Closed Loop Gain VGain Select = VDD 6 5.5 6.5 dB (min) dB (max) AV Closed Loop Gain VGain Select = GND 12 11.5 12.5 dB (min) dB (max) VOS Output Offset Voltage 10 mV TWU Wake-up Time 5 ms Po Output Power THD+N = 3% (max), fIN = 1kHz 1.4 W THD+N Total Harmonic Distortion+Noise PO = 400mWRMS, fIN = 1kHz RIN Differential Input Resistance PSRR Power Supply Rejection Ratio Mode (Note 9) Units (Limits) 0.8 % VGain Select = VDD, Gain = 6dB 100 k VGain Select = GND, Gain = 12dB 65 k VRipple = 100mVRMS, fRipple = 217Hz, AV = 6dB Inputs Terminated 52 dB CMRR Common Mode Rejection Ratio VRipple = 100mVRMS, fRipple = 217Hz, AV = 6dB 43 dB eN Output Noise Voltage A-Weighted filter, VIN = 0V 350 V 3 www.national.com LM4665 Absolute Maximum Ratings LM4665 Electrical Characteristics VDD = 3V (Notes 1, 2) The following specifications apply for VDD = 3V, and RL = 8 + 33H, measurement bandwidth is < 10Hz - 22kHz unless otherwise specified. Limits apply for TA = 25C. LM4665 Symbol Parameter IDD Quiescent Power Supply Current Conditions Typical Limit Units (Limits) (Note 6) (Notes 7, 8) VIN = 0V, No Load VIN = 0V, 8 + 22H Load 3.0 3.5 7.0 mA (max) mA A (max) ISD Shutdown Current VSD = VSD VSDIH Shutdown Voltage Input High VSD VSDIL Shutdown Voltage Input Low VSDIH 0.01 5.0 Mode = VDD 1.0 1.4 V (min) VSD Mode = VDD 0.8 0.4 V (max) Shutdown Voltage Input High VSD Mode = GND 1.0 1.4 V (min) VSDIL Shutdown Voltage Input Low VSD Mode = GND 0.8 0.4 V (max) VGSIH Gain Select Input High 1.0 1.4 V (min) VGSIL Gain Select Input Low 0.8 0.4 V (max) AV Closed Loop Gain VGain Select = VDD 6 5.5 6.5 dB (min) dB (max) AV Closed Loop Gain VGain Select = GND 12 11.5 12.5 dB (min) dB (max) VOS Output Offset Voltage TWU Wake-up Time Po Output Power THD+N = 2% (max), fIN = 1kHz THD+N Total Harmonic Distortion+Noise PO = 100mWRMS, fIN = 1kHz RIN Differential Input Resistance Mode (Note 9) 10 mV 5 VGain VGain 400 ms 350 mW (min) 0.4 % (max) Select = VDD, Gain = 6dB 100 k Select = GND, Gain = 12dB 65 k 52 dB PSRR Power Supply Rejection Ratio VRipple = 100mVRMS, fRipple = 217Hz, AV = 6dB, Inputs Terminated CMRR Common Mode Rejection Ratio VRipple = 100mVRMS, fRipple = 217Hz, AV = 6dB 39 dB eN Output Noise Voltage A-Weighted filter, VIN = 0V 350 V Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, JA, and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX-TA)/JA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4665, TJMAX = 150C. See the Efficiency and Power Dissipation versus Output Power curves for more information. Note 4: Human body model, 100 pF discharged through a 1.5 k resistor. Note 5: Machine Model, 220 pF-240 pF discharged through all pins. Note 6: Typical specifications are specified at 25C and represent the parametric norm. Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Note 9: Shutdown current is measured in a normal room environment. Exposure to direct sunlight will increase ISD by a maximum of 2A. The Shutdown Mode pin should be connected to VDD or GND and the Shutdown pin should be driven as close as possible to VDD or GND for minimum shutdown current and the best THD performance in PLAY mode. See the Application Information section under SHUTDOWN FUNCTION for more information. Note 10: The exposed-DAP of the LDA10B package should be electrically connected to GND. Note 11: The LM4665 in the micro SMD package (ITL) has an operating range of 2.7V - 3.8V for 8 speaker loads. The supply range may be increased as speaker impedance is increased. It is not recommended that 4 loads be used with the micro SMD package. To increase the supply voltage operating range, see Figure 2 and INCREASING SUPPLY VOLTAGE RANGE in the Application Information section for more information. External Components Description (Figure 1) Components 1. www.national.com CS Functional Description Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section for information concerning proper placement and selection of the supply bypass capacitor. 4 LM4665 Typical Performance Characteristics THD+N vs Frequency VDD = 3V, RL = 8 + 33H POUT = 100mW, 30kHz BW THD+N vs Frequency VDD = 5V, RL = 8 + 33H POUT = 400mW, 30kHz BW 200270E0 200270D9 THD+N vs Power Out VDD = 5V, RL = 8 + 33H f = 1kHz, 22kHz BW THD+N vs Frequency VDD = 3.3V, RL = 4 + 33H POUT = 300mW, 30kHz BW 200270D8 200270D5 THD+N vs Power Out VDD = 3.3V, RL = 4 + 33H f = 1kHz, 22kHz BW THD+N vs Power Out VDD = 3V, RL = 8 + 33H f = 1kHz, 22kHz BW 200270E2 200270E1 5 www.national.com LM4665 Typical Performance Characteristics (Continued) THD+N vs Common-Mode Voltage VDD = 3V, RL = 8 + 33H, f = 1kHz POUT = 100mW, 22kHz BW THD+N vs Common-Mode Voltage VDD = 5V, RL = 8 + 33H, f = 1kHz POUT = 400mW, 22kHz BW 20027031 20027032 VCM CMRR vs Frequency VDD = 5V, RL = 8 + 33H = 100mVRMS Sine Wave, 80kHz BW VCM 20027095 CMRR vs Frequency VDD = 3V, RL = 8 + 33H = 100mVRMS Sine Wave, 80kHz BW 20027098 PSRR vs DC Common-Mode Voltage VDD = 3V, RL = 8 + 33H VRipple = 100mVRMS, fRipple = 217Hz Sine Wave PSRR vs DC Common-Mode Voltage VDD = 5V, RL = 8 + 33H VRipple = 100mVRMS, fRipple = 217Hz Sine Wave 20027096 20027097 www.national.com 6 VCM (Continued) PSRR vs Frequency VDD = 5V, RL = 8 + 33H = 100mVRMSSine Wave, 22kHz BW VCM PSRR vs Frequency VDD = 3V, RL = 8 + 33H = 100mVRMSSine Wave, 22kHz BW 20027099 20027094 Efficiency (top trace) and Power Dissipation (bottom trace) vs Output Power VDD = 3V, RL = 8 + 33H, f = 1kHz, THD < 2% Efficiency (top trace) and Power Dissipation (bottom trace) vs Output Power VDD = 5V, RL = 8 + 33H, f = 1kHz, THD < 3% 200270A1 200270A2 Gain Threshold Voltages VDD = 3V - 5V Efficiency (top trace) and Power Dissipation (bottom trace) vs Output Power VDD = 3.3V, RL = 4 + 33H, f = 1kHz, THD < 2% 200270A3 200270A5 7 www.national.com LM4665 Typical Performance Characteristics LM4665 Typical Performance Characteristics (Continued) Output Power vs Supply Voltage RL = 16 + 33H, f = 1kHz Output Power vs Supply Voltage RL = 8 + 33H, f = 1kHz 200270D7 200270E3 Shutdown Hysteresis Voltage VDD = 5V, SD Mode = GND (SD Low) Output Power vs Supply Voltage RL = 4 + 33H, f = 1kHz 200270D6 200270A7 Shutdown Hysteresis Voltage VDD = 5V, SD Mode = GND (SD High) Shutdown Hysteresis Voltage VDD = 3V, SD Mode = GND (SD Low) 200270A8 www.national.com 200270A9 8 LM4665 Typical Performance Characteristics (Continued) Shutdown Hysteresis Voltage VDD = 3V, SD Mode = GND (SD High) Supply Current vs Supply Voltage RL = 8 + 33H 200270B0 20027002 tential "sink" for the small excess of input power over audio band output power. The LM4665 dissipates only a fraction of the excess power requiring no additional PCB area or copper plane to act as a heat sink. Application Information GENERAL AMPLIFIER FUNCTION The output signals generated by the LM4665 consist of two, BTL connected, output signals that pulse momentarily from near ground potential to VDD. The two outputs can pulse independently with the exception that they both may never pulse simultaneously as this would result in zero volts across the BTL load. The minimum width of each pulse is approximately 160ns. However, pulses on the same output can occur sequentially, in which case they are concatenated and appear as a single wider pulse to achieve an effective 100% duty cycle. This results in maximum audio output power for a given supply voltage and load impedance. The LM4665 can achieve much higher efficiencies than class AB amplifiers while maintaining acceptable THD performance. The short (160ns) drive pulses emitted at the LM4665 outputs means that good efficiency can be obtained with minimal load inductance. The typical transducer load on an audio amplifier is quite reactive (inductive). For this reason, the load can act as it's own filter, so to speak. This "filter-less" switching amplifier/transducer load combination is much more attractive economically due to savings in board space and external component cost by eliminating the need for a filter. DIFFERENTIAL AMPLIFIER EXPLANATION As logic supply voltages continue to shrink, designers are increasingly turning to differential analog signal handling to preserve signal to noise ratios with restricted voltage swing. The LM4665 is a fully differential amplifier that features differential input and output stages. A differential amplifier amplifies the difference between the two input signals. Traditional audio power amplifiers have typically offered only single-ended inputs resulting in a 6dB reduction in signal to noise ratio relative to differential inputs. The LM4665 also offers the possibility of DC input coupling which eliminates the two external AC coupling, DC blocking capacitors. The LM4665 can be used, however, as a single ended input amplifier while still retaining it's fully differential benefits. In fact, completely unrelated signals may be placed on the input pins. The LM4665 simply amplifies the difference between the signals. A major benefit of a differential amplifier is the improved common mode rejection ratio (CMRR) over single input amplifiers. The common-mode rejection characteristic of the differential amplifier reduces sensitivity to ground offset related noise injection, especially important in high noise applications. POWER DISSIPATION AND EFFICIENCY In general terms, efficiency is considered to be the ratio of useful work output divided by the total energy required to produce it with the difference being the power dissipated, typically, in the IC. The key here is "useful" work. For audio systems, the energy delivered in the audible bands is considered useful including the distortion products of the input signal. Sub-sonic (DC) and super-sonic components ( > 22kHz) are not useful. The difference between the power flowing from the power supply and the audio band power being transduced is dissipated in the LM4665 and in the transducer load. The amount of power dissipation in the LM4665 is very low. This is because the ON resistance of the switches used to form the output waveforms is typically less than 0.25. This leaves only the transducer load as a po- PCB LAYOUT CONSIDERATIONS As output power increases, interconnect resistance (PCB traces and wires) between the amplifier, load and power supply create a voltage drop. The voltage loss on the traces between the LM4665 and the load results is lower output power and decreased efficiency. Higher trace resistance between the supply and the LM4665 has the same effect as a poorly regulated supply, increase ripple on the supply line also reducing the peak output power. The effects of residual trace resistance increases as output current increases due to higher output power, decreased load impedance or both. To maintain the highest output voltage swing and corresponding peak output power, the PCB traces that connect 9 www.national.com LM4665 Application Information (Continued) The LM4665 has an internal resistor connected between the Shutdown Mode and Shutdown pins. The purpose of this resistor is to eliminate any unwanted state changes when the Shutdown pin is floating, as long as the Shutdown Mode pin is connected to GND or VDD. When the Shutdown Mode pin is properly connected, the LM4665 will enter the shutdown state when the Shutdown pin is left floating or if not floating, when the shutdown voltage has crossed the corresponding threshold for the logic level assigned by the Shutdown Mode pin voltage. To minimize the supply current while in the shutdown state, the Shutdown pin should be driven to the same potential as the Shutdown Mode pin or left floating. The amount of additional current due to the internal shutdown resistor can be found by Equation (1) below. the output pins to the load and the supply pins to the power supply should be as wide as possible to minimize trace resistance. The rising and falling edges are necessarily short in relation to the minimum pulse width (160ns), having approximately 2ns rise and fall times, typical, depending on parasitic output capacitance. The inductive nature of the transducer load can also result in overshoot on one or both edges, clamped by the parasitic diodes to GND and VDD in each case. From an EMI standpoint, this is an aggressive waveform that can radiate or conduct to other components in the system and cause interference. It is essential to keep the power and output traces short and well shielded if possible. Use of ground planes, beads, and micro-strip layout techniques are all useful in preventing unwanted interference. (VSD - VSD) / 60k (1) With only a 0.5V difference between the Shutdown Mode voltage and the Shutdown voltage an additional 8.3A of current will be drawn while in the shutdown state. POWER SUPPLY BYPASSING As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection ratio (PSRR). The capacitor (CS) location should be as close as possible to the LM4665. Typical applications employ a voltage regulator with a 10F and a 0.1F bypass capacitors that increase supply stability. These capacitors do not eliminate the need for bypassing on the supply pin of the LM4665. A 1F tantalum capacitor is recommended. GAIN SELECTION FUNCTION The LM4665 has fixed selectable gain to minimize external components, increase flexibility and simplify design. For a differential gain of 6dB (2V/V), the Gain Select pin should be permanently connected to VDD or driven to a logic high level. For a differential gain of 12dB (4V/V), the Gain Select pin should be permanently connected to GND or driven to a logic low level. The gain of the LM4665 can be switched while the amplifier is in PLAY mode driving a load with a signal without damage to the IC. The voltage on the Gain Select pin should be switched quickly between GND (logic low) and VDD (logic high) to eliminate any possible audible artifacts from appearing at the output. For typical threshold voltages for the Gain Select function, refer to the Gain Threshold Voltages graph in the Typical Performance Characteristics section. SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM4665 contains shutdown circuitry that reduces current draw to less than 0.01A. In addition, the LM4665 contains a Shutdown Mode pin allowing the designer to designate whether the shutdown circuitry is activated by either a High level logic signal or a Low level logic signal. The Shutdown Mode pin should be permanently connected to either GND (Low) or VDD (High). The LM4665 may then be placed into shutdown by toggling the Shutdown pin to the same state as the Shutdown Mode pin. For simplicity's sake, this is called "Shutdown same", as the LM4665 enters into a shutdown state whenever the two pins are in the same logic state. The trigger point for either shutdown high or shutdown low is shown as a typical value in the Electrical Characteristics Tables and in the Shutdown Hysteresis Voltage graphs found in the Typical Performance Characteristics section. It is best to switch between ground and supply for minimum current usage while in the shutdown state. While the LM4665 may be disabled with shutdown voltages in between ground and supply, the idle current will be greater than the typical 0.01A value. Increased THD may also be observed with voltages greater than GND and less than VDD on the Shutdown pin when in PLAY mode. www.national.com MODE INCREASING SUPPLY VOLTAGE RANGE When using the micro SMD package (ITL), the operating supply voltage range is 2.7V - 3.8V with an 8 speaker load. To increase the operating supply voltage range, four Schottky diodes (D1 - D4) can be used to control the over and undershoot of the output pulse waveform (See Figure 2 below). To reduce THD+N, small value capacitors in the range of 10pF - 33pF (CN1 & CN2) can also be added as needed. The diodes should be placed as close to the micro SMD package as possible. 10 LM4665 Application Information (Continued) 200270E5 FIGURE 2. Increased Supply Voltage Operating Range for the micro SMD package SINGLE-ENDED CIRCUIT CONFIGURATIONS 200270C4 FIGURE 3. Single-Ended Input, Shutdown High and Gain of 6dB Configuration 11 www.national.com LM4665 Application Information (Continued) 200270C2 FIGURE 4. Single-Ended Input, Shutdown High and Gain of 12dB Configuration 200270C3 FIGURE 5. Single-Ended Input, Shutdown Low and Gain of 6dB Configuration www.national.com 12 LM4665 Application Information (Continued) 200270C1 FIGURE 6. Single-Ended Input, Shutdown Low and Gain of 12dB Configuration REFERENCE DESIGN BOARD SCHEMATIC 200270B1 FIGURE 7. 13 www.national.com LM4665 Application Information The commonly used Audio Precision analyzer is differential, but its ability to accurately reject fast pulses of 160nS width is questionable necessitating the on board measurement filter. When in doubt or when the signal needs to be singleended, use an audio signal transformer to convert the differential output to a single ended output. Depending on the audio transformer's characteristics, there may be some attenuation of the audio signal which needs to be taken into account for correct measurement of performance. (Continued) In addition to the minimal parts required for the application circuit, a measurement filter is provided on the evaluation circuit board so that conventional audio measurements can be conveniently made without additional equipment. This is a balanced input / grounded differential output low pass filter with a 3dB frequency of approximately 35kHz and an on board termination resistor of 300 (see schematic). Note that the capacitive load elements are returned to ground. This is not optimal for common mode rejection purposes, but due to the independent pulse format at each output there is a significant amount of high frequency common mode component on the outputs. The grounded capacitive filter elements attenuate this component at the board to reduce the high frequency CMRR requirement placed on the analysis instruments. Measurements made at the output of the measurement filter suffer attenuation relative to the primary, unfiltered outputs even at audio frequencies. This is due to the resistance of the inductors interacting with the termination resistor (300) and is typically about -0.35dB (4%). In other words, the voltage levels (and corresponding power levels) indicated through the measurement filter are slightly lower than those that actually occur at the load placed on the unfiltered outputs. This small loss in the filter for measurement gives a lower output power reading than what is really occurring on the unfiltered outputs and its load. Even with the grounded filter the audio signal is still differential, necessitating a differential input on any analysis instrument connected to it. Most lab instruments that feature BNC connectors on their inputs are NOT differential responding because the ring of the BNC is usually grounded. LM4665 MSOP BOARD ARTWORK Composite View Silk Screen 200270B3 200270B2 Top Layer Bottom Layer 200270B5 200270B4 www.national.com 14 LM4665 Application Information (Continued) LM4665 LLP BOARD ARTWORK Composite View Silk Screen 200270D1 200270D2 Top Layer Bottom Layer 200270D3 200270D4 15 www.national.com LM4665 Application Information (Continued) LM4665 micro SMD BOARD ARTWORK Composite View Silk Screen 200270C8 200270C7 Top Layer Bottom Layer 200270C0 200270B9 www.national.com 16 LM4665 Physical Dimensions inches (millimeters) unless otherwise noted 9 Bump micro SMD Order Number LM4665ITL, LM4665ITLX NS Package Number TLA09AAA X1 = 1.514 X2 = 1.514 X3 = 0.600 Mini Small Outline (MSOP) Order Number LM4665MM NSPackage Number MUB10A 17 www.national.com LM4665 Filterless High Efficiency 1W Switching Audio Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4665LD NSPackage Number LDA10B LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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