PAM8301AAF

NOT RECOMMENDED FOR NEW DESIGN USE PAM8013 or PAM8304 PAM8301 FILTERLESS CLASS-D MONO AUDIO AMPLIFIER Description Pin Assignments The PAM8301 is a 1.5W Class-D mono audio amplifier. Its low THD+N feature offers high quality sound reproduction. The new filterless architecture allows the device to drive speaker directly instead of using low-pass output filters, therefore saving system cost and PCB area. With the same number of external components, the efficiency of the PAM8301 is much better than that of Class-AB cousins. It can optimize battery life thus is ideal for portable applications. The PAM8301 is available in SOT23-6 package. Features Applications • • • • • • • • • • • • • • • 1.5W Output at 10% THD with a 8Ω Load and 5V Power Supply Filterless, Low Quiescent Current and Low EMI High Efficiency up to 88% Superior Low Noise Short Circuit Protection Thermal Shutdown Few External Components to Save Space and Cost Tiny SOT23-6 Package Pb-Free Package PMP/MP4 GPS Portable Speakers Walkie Talkie Handsfree Phones/Speaker Phones Cellular Phones Typical Applications Circuit PAM8301 Document number: DS36431 Rev. 2 - 3 1 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Pin Descriptions Pin Number 1 2 3 4 5 6 Pin Name OUTGND IN SD VDD OUT+ Function Negative Output Ground Input Shutdown, Active Low Power Supply Positive Output Functional Block Diagram Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Parameter Supply Voltage at No Input Signal Input Voltage Range Maximum Junction Temperature Storage Temperature Soldering Temperature Rating 6.0 Unit -0.3 to VDD +0.3 150 -65 to +150 300, 5sec V °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage Range Operation Temperature Range Junction Temperature Range PAM8301 Document number: DS36431 Rev. 2 - 3 Rating 2.5 to 5.5 -40 to +85 -40 to +125 Unit V °C °C 2 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Thermal Information Parameter Package Symbol Max Thermal Resistance (Junction to Ambient) SOT23-6 θJA 250 Thermal Resistance (Junction to Case) SOT23-6 θJC 130 Unit °C/W Electrical Characteristics (@TA = +25°C, VDD = 5V, Gain = 24dB, RL = 8Ω, unless otherwise specified.) Symbol VDD Parameter Test Conditions Supply Voltage Range Quiescent Current No Load ISHDN Shutdown Current VSHDN = 0V VSH SHDN Input High VSL SHDN Input Low PO f = 1kHz AC Power Supply Ripple Rejection VN fOSC η SNR OTP OTH P MOSFET N MOSFET THD+N = 1% THD+N = 10% 0.2 RL = 8Ω, PO = 0.5W 0.3 No Inputs, f = 1kHz, VPP = 200mV 45 Gain Output Noise No A-Weighting A-Weighting Oscillator Frequency Peak Efficiency Signal to Noise Ratio Over Temperature Protection Over Temperature Hysterisis PAM8301 Document number: DS36431 Rev. 2 - 3 V 8 mA 1 µA 0.45 0.20 1.2 1.5 RL = 8Ω, PO = 200mW f = 1kHz f = 20 to 20kHz 3 of 10 www.diodes.com Units 5.5 0.4 Output Power PSRR Max 1.2 IDS = 100mA Total Harmonic Distortion Plus Noise GV 4 Drain-Source On-State Resistance THD+N Typ 2.5 IQ RDS(ON) Min V Ω W % 50 dB 24 dB 180 120 µV 200 250 85 88 78 135 30 300 kHz % dB °C °C September 2020 © Diodes Incorporated PAM8301 Typical Performance Characteristics (@TA = +25°C, unless otherwise specified.) PAM8301 Document number: DS36431 Rev. 2 - 3 4 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Typical Performance Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) PAM8301 Document number: DS36431 Rev. 2 - 3 5 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Typical Performance Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) Application Information Test Setup for Performance Testing Notes: 1. The AP AUX-0025 low pass filter is necessary for every class-D amplifier measurement with AP analyzer. 2. Two 22μH inductors are used in series with load resistor to emulate the small speaker for efficiency measurement. PAM8301 Document number: DS36431 Rev. 2 - 3 6 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Application Information (cont.) Maximum Gain As shown in block diagram (Page 2), the PAM8301 has two internal amplifier stages. The first stage's gain is externally configurable, while the second stage's is internally fixed. The closed-loop gain of the first stage is set by selecting the ratio of RF to RI while the second stage's gain is fixed at 2x.The output of amplifier one serves as the input to amplifier two, thus the two amplifiers produce signals identical in magnitude, but different in phase by +180°. Consequently, the differential gain for the IC is AVD = 20*log [2*(RF/RI)] The PAM8301 sets maximum RF = 80kΩ, minimum RI = 10kΩ, so the maximum closed-gain is 24dB. Input Capacitors (CI) In typical application, an input capacitor, CI, is required to allow the amplifier to bias input signals to a proper DC level for optimum operation. In this case, CI and the minimum input impedance RI (10k internal) form a high pass filter with a corner frequency determined by the following equation: fC = 1 2ΠR I CI It is important to choose the value of CI as it directly affects low frequency performance of the circuit, for example, when an application requires a flat bass response as low as 100Hz. Equation is reconfigured as follows: CI = 1 2ΠRI f I As the input resistance is variable, for the CI value of 0.16µF, one should actually choose the CI within the range of 0.1µF to 0.22µF. A further consideration for this capacitor is the leakage path from the input source through the input network (RI, RF, CI) 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 application. For this reason, a low leakage tantalum or ceramic capacitor is the best choice. When a polarized capacitor is 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. Power Supply Decoupling (CS) The PAM8301 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output THD and PSRR as low as possible. Power supply decoupling affects low frequency response. Optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1.0μF is good, placing it as close as possible to the device VDD terminal. For filtering lower-frequency noise signals, a capacitor of 10μF or larger, closely located to near the audio power amplifier is recommended. Shutdown Operation In order to reduce shutdown power consumption, the PAM8301 contains shutdown circuitry for turn off the amplifier. This shutdown feature turns the amplifier off when a logic low is applied on the SHDOWN pin. By switching the shutdown pin over to GND, the PAM8301 supply current draw will be minimized in idle mode. For the best power on/off pop performance, the amplifier should be set in the shutdown mode prior to power on/off operation. Under Voltage Lock-Out (UVLO) The PAM8301 incorporates circuitry to detect low on or off voltage. When the supply voltage drops to 2.1V or below, the PAM8301 goes into a state of shutdown, and the device comes out of its shutdown state and starts to normal operation by reset the power supply or SD pin. PAM8301 Document number: DS36431 Rev. 2 - 3 7 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 Application Information (cont.) How to Reduce EMI (Electro Magnetic Interference) A simple solution is to put an additional capacitor 1000µF at power supply terminal for power line coupling if the traces from amplifier to speakers are short (< 20cm). Most applications require a ferrite bead filter as shown at Figure 1. The ferrite filter depresses EMI of around 1MHz and higher. When selecting a ferrite bead, choose one with high impedance at high frequencies and low impedance at low frequencies. Figure 1: Ferrite Bead Filter to Reduce EMI Ordering Information PAM8301 X X X Pin Configuration Package Type A: A: SOT23-6 Number of Pins F: 6 1: OUT2: GND 3: IN 4: SD 5: VDD 6: OUT+ Part Number PAM8301AAF PAM8301 Document number: DS36431 Rev. 2 - 3 Part Marking FPXYW Package Type SOT23-6 8 of 10 www.diodes.com Standard Package 3000 Unit/Tape&Reel September 2020 © Diodes Incorporated PAM8301 Marking Information Package Outline Dimensions (All dimensions in mm.) SOT23-6 PAM8301 Document number: DS36431 Rev. 2 - 3 9 of 10 www.diodes.com September 2020 © Diodes Incorporated PAM8301 IMPORTANT NOTICE 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). 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