A Product Line of Diodes Incorporated PAM8304 3W MONO CLASS D AUDIO AMPLIFIER Description Pin Assignments The PAM8304 is a mono filter-less Class-D amplifier with high SNR DFN3X3-8L Top View and differential input that helps eliminate noise. The PAM8304 supports 2.8V to 6V operation make it idea for up to 4 cells alkaline battery applications. The PAM8304 is capable of driving speaker OUT+ 1 power. PVDD 2 Features like greater than 90% efficiency and small PCB area make VDD 3 the PAM8304 Class-D amplifier ideal for portable applications. The output uses a filter-less architecture minimizing the number of P8304 XXXYW NEW PRODUCT loads as low as 3Ω speaker with a 5V supply maximizing the output IN- 4 8 OUT- 7 GND 6 SD 5 IN+ external components and PCB area whilst providing a high performance, simple and lower cost system. MSOP-8L Top View The PAM8304 features short circuit protection, thermal shutdown and under voltage lock-out. OUT+ 1 PVDD 2 Features VDD 3 Supply Voltage from 2.8V to 6.0 V 3Ω Driving Capability IN- 4 3.0W@10% THD Output with a 4Ω Load and 5V Supply High Efficiency up to 90% @1W with an 8Ω Load 7 GND 6 SD 5 IN+ Applications Shutdown Current <1μA Superior Low Noise without Input Short Circuit Protection Thermal Shutdown Available in Space Saving DFN3030-8L and MSOP-8L Packages P8 304 XXXYW The PAM8304 is available in DFN3030-8L and MOP-8L packages. 8 OUT- Pb-Free Package MP4/MP3 GPS Set-Top-Box Tablets/Digital Photo Frame Electronic Dictionary Portable Game Machines Typical Applications Circuit V DD 1μ F P V DD V DD 0 .1 μ F V IN IN+ 0 .1 μ F /S D IN- OU T + PA M 8 3 0 4 /SD OU T - P GN D PAM8304 Document number: DS36589 Rev. 1 - 2 1 of 11 www.diodes.com GN D October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 NEW PRODUCT Pin Descriptions Pin Name OUT+ PVDD VDD ININ+ MSOP-8L/DFN3x3-8L 1 2 3 4 5 /SD GND OUTExposed Pad 6 7 8 — Function Positive BTL Output Power Supply Analog Power Supply Negative Differential Input Positive Differential Input Shutdown Terminal, Active Low Ground Negative BTL Output NC Functional Block Diagram VDD IN+ PWM Modulator + IN- SD SD Bias and Vref OSC PVDD Gate Driv e OUT+ Gate Driv e OUT- UVLO SC Protec t Startup Protec tion OTP GND Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage (VDD) Input Voltage (IN+, IN-, /SD) Storage Temperature Maximum Junction Temperature Rating 6.5 Unit V -0.3 to VDD +0.3 -65 to +150 150 V °C °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max VDD Supply Voltage 2.8 6.0 V TA Operating Ambient Temperature Range -40 +85 °C TJ Junction Temperature Range -40 +125 °C PAM8304 Document number: DS36589 Rev. 1 - 2 2 of 11 www.diodes.com Unit October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Electrical Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.) Symbol VDD Parameter Supply Voltage Test Conditions NEW PRODUCT THD+N = 10%, f = 1kHz, R = 4Ω THD+N = 1%, f = 1kHz, R = 4Ω Po Output Power THD+N = 10%, f = 1kHz, R = 8Ω THD+N = 1%, f = 1kHz, R = 8Ω THD+N Total Harmonic Distortion Plus Noise VDD = 5.0V, Po = 1W, R = 8Ω VDD = 3.6V, Po = 0.1W, R = 8Ω VDD = 3.2V, Po =0.1W, R = 8Ω VDD = 5.0V, Po = 0.5W, R = 4Ω VDD = 3.6V, Po = 0.2W, R = 4Ω Min 2.8 VDD = 5.0V VDD = 3.6V VDD = 3.2V VDD = 5.0V 3.0 1.5 1.2 2.4 VDD = 3.6V VDD = 3.2V VDD = 5.0V VDD = 3.6V VDD = 3.2V VDD = 5.0V VDD = 3.6V 1.25 1.0 1.75 0.90 0.70 1.40 0.72 VDD = 3.2V 0.60 0.17 0.16 0.14 0.14 0.16 f = 1kHz f = 1kHz VDD = 3.2V, Po = 0.1W, R = 4Ω Power Supply Ripple Rejection VDD = 3.6V, Inputs ac-grounded with C = 1μF Dyn Dynamic Range VDD = 5V,THD = %, R = 8Ω Vn Output Noise Inputs ac-grounded PSRR IQ Isd Rdson fsw Gv Vos VIH VIL Efficiency Quiescent Current Shutdown Current Static Drain-to Source Onstate Resistor Switching Frequency Closed-loop Gain Output Offset Voltage SD Input High Voltage SD Input Low Voltage PAM8304 Document number: DS36589 Rev. 1 - 2 RL = 8Ω,THD = 10% RL = 4Ω,THD = 10% VDD = 5V VDD = 2.8V to 5V High Side PMOS,I = 500mA Low Side NMOS,I = 500mA VDD = 2.8V to 5V VDD = 2.8V to 5V Input ac-ground, VDD = 5V VDD = 5V VDD = 5V f=217Hz f=1kHz f=10kHz f=1kHz No A weighting W W W % % dB dB μV 130 93 86 5 No Load /SD=0V % 1 mA μA 50 mΩ mΩ kHz V/V mV 325 200 400 300K/Rin VDD=5.0V VDD=5.0V Unit V W 170 f=1kHz 3 of 11 www.diodes.com Max 6.0 0.17 -68 -70 -67 95 A-weighting η Typ 1.4 1.0 V October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Performance Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.) THD+N Vs. Output Power (RL=4Ω) THD+N Vs. Output Power (RL=8Ω) 20 20 NEW PRODUCT 10 10 VDD=5.0V 5 VDD=5.0V 5 2 2 % 1 0.5 0.5 0.2 0.2 0.1 1m 2m 5m 10m 20m 50m 100m VDD=3.6V % VDD=3.6V 1 200m 500m 1 2 0.1 1m 5 W 2m 5m 10m 20m 50m 100m 200m 500m 1 2 3 W THD+N Vs. Frequency PSRR Vs. Frequency 10 +0 Po=300mW T -5 5 -10 -15 VDD=5.0V 2 VDD=5.0V -20 -25 1 -30 -35 VDD=3.6V 0 .5 % d B -40 -45 -50 0 .2 -55 0 .1 -60 -65 0 .0 5 -70 -75 0 .0 2 20 50 100 200 500 1k 2k 5k 10k -80 20 20k 50 100 200 500 Hz 1k 2k 5k 10k 20k 1k 2k 5k 10k 20k Hz Frequency Response Noise Floor + 20 + 20 + 19.5 + 10 + 19 + 18.5 +0 + 18 -10 VDD=5.0V + 17.5 -20 + 17 -30 + 16.5 + 16 d B g A + 15.5 + 15 + 14.5 d B r -40 A -60 + 14 -50 -70 + 13.5 -80 + 13 + 12.5 -90 + 12 + 11.5 -100 VDD=5.0V + 11 -110 + 10.5 + 10 20 50 100 200 500 1k 2k 5k 10k 20k Hz PAM8304 Document number: DS36589 Rev. 1 - 2 4 of 11 www.diodes.com -120 20 50 100 200 500 Hz October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Performance Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.) Efficiency Vs. Output Power (RL=8Ω) NEW PRODUCT Efficiency Vs. Output Power (RL=4Ω) Quiescent Current Vs. Supply Voltage OSC Frequency Vs. Supply Voltage Start-up Response PAM8304 Document number: DS36589 Rev. 1 - 2 Shutdown Response 5 of 11 www.diodes.com October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Application Information Input Capacitors (Ci ) In the typical application an input capacitor Ci is required to allow the amplifier to bias the input signal to the proper DC level for optimum operation. In this case, Ci and the minimum input impedance Ri form a high-pass filter with the corner frequency determined in the follow equation: NEW PRODUCT fC 1 2 RiCi It is important to consider the value of Ci as it directly affects the low frequency performance of the circuit. For example, when Ri is 150kΩ and the specification calls for a flat bass response down to 150Hz. The equation is reconfigured as followed to determine the value of Ci: Ci 1 2 Rifc When input resistance variation is considered, if Ci is 7nF one would likely choose a value of 10nF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ci, Ri and Rf) to the load. This leakage current creates a DC offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used the positive side of the capacitor should face the amplifier input in most applications as the DC level is held at VDD/2, which is likely higher than the source DC level. Please note that it is important to confirm the capacitor polarity in the application. Decoupling Capacitor (CS ) The PAM8304 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) as low as possible. Power supply decoupling also prevents the oscillations causing by long lead length between the amplifier and the speaker. Optimum decoupling is achieved by using two different types of capacitors that target different types of noise on the power supply leads. Higher frequency transients, spikes or digital hash should be filtered with a good low equivalent-series-resistance (ESR) ceramic capacitor with a value of typically 1μF. This capacitor should be placed as close as possible to the VDD pin of the device. Lower frequency noise signals should be filtered with a large ceramic capacitor of 10μF or greater. It's recommended to place this capacitor near the audio power amplifier. How to Reduce EMI Most applications require a ferrite bead filter for EMI elimination as shown in Figure 1. The ferrite filter reduces EMI around 1MHz and higher. When selecting a ferrite bead it should be chosen with high impedance at high frequencies but low impedance at low frequencies. Ferrite Bead OUT+ 200pF Ferrite Bead OUT- 200pF Figure 1 Ferrite Bead Filter to Reduce EMI PAM8304 Document number: DS36589 Rev. 1 - 2 6 of 11 www.diodes.com October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Application Information (cont.) Shutdown Operation In order to reduce power consumption while not in use the PAM8304 contains amplifier shutdown circuitry. When a logic low or ground is applied to the /SD pin the PAM8304 will enter a standby mode and supply current drawn will be minimized. Under Voltage Lock-out (UVLO) NEW PRODUCT The PAM8304 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8304 goes into a state of shutdown. The device returns to normal operation only when VDD is higher than 2.5V. Short Circuit Protection (SCP) The PAM8304 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorts or output-toGND shorts occur. When a short circuit occurs, the device immediately goes into shutdown state. Once the short is removed the device will be reactivated. Over Temperature Protection (OTP) Thermal protection prevents the device from damage. When the internal die temperature exceeds a typical of 150°C the device will enter a shutdown state and the outputs are disabled. This is not a latched fault, once the thermal fault is cleared and the temperature of the die decreased by 40°C the device will restart with no external system interaction. Anti-POP and Anti-Click Circuitry The PAM8304 contains circuitry to minimize turn-on and turn-off transients or “click and pops”, where turn-on refers to either power supply turn-on or device recover from shutdown mode. When the device is turned on, the amplifiers are internally muted. An internal current source ramps up the internal reference voltage. The device will remain in mute mode until the reference voltage reach half supply voltage. As soon as the reference voltage is stable, the device will begin full operation. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage. PAM8304 Document number: DS36589 Rev. 1 - 2 7 of 11 www.diodes.com October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Ordering Information PAM8304 X X X NEW PRODUCT Pin Configuration A: 8 Pin Package Type Y: DFN3030 S: MSOP Shipping Package R: Tape & Real Part Number PAM8304AYR Package DFN3030-8L Standard Package 3,000Units/Tape&Real PAM8304ASR MSOP-8L 2,500Units/Tape&Real Marking Information DFN3030 /MOP8 PAM8304: Product Code X: Internal Code Y: Year W: Week PAM8304 Document number: DS36589 Rev. 1 - 2 8 of 11 www.diodes.com October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Package Outline Dimensions (All dimensions in mm.) NEW PRODUCT Package: DFN3030 DFN Unit: Millimeter PAM8304 Document number: DS36589 Rev. 1 - 2 9 of 11 www.diodes.com October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 Package Outline Dimensions (All dimensions in mm.) NEW PRODUCT Package: MSOP REF Millimeter Min Max A -- 1.10 A1 0.05 0.15 A2 0.78 0.94 b 0.22 0.38 c 0.08 0.23 D 2.90 3.10 E 2.90 3.10 E1 4.75 5.05 e L PAM8304 Document number: DS36589 Rev. 1 - 2 0.65BSC 0.40 10 of 11 www.diodes.com 0.70 October 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8304 IMPORTANT NOTICE NEW PRODUCT DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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