A Product Line of Diodes Incorporated PAM8902H 30 VPP MONO CLASS-D AUDIO AMPLIFIER FOR PIEZO/CERAMIC SPEAKERS Description Pin Assignments The PAM8902H is a mono, Class-D audio amplifier with integrated boost convertor designed for piezo and ceramic speakers.The PAM8902H is capable of driving a ceramic/ piezo speaker with 30Vpp(10.6Vrms) from a 3.6V power supply.The PAM8902H's Boost converter operates at a fixed frequency of 1.5MHz , and provides a 17.5V supply with a minimum number of external components. PAM8902H features an integrated audio low pass filter that rejects high frequency noise thus improving audio fidelity. And three gain modes of 21dB, 26dB and 32.5dB easy for using.PAM8902H also provides thermal ,short, under and over voltage protection. The PAM8902H is available in a 16-ball 1.95mm x 1.95mm CSP package and 16-pin QFN4x4 package. Features • • Supply Voltage Range From 2.5V to 5.5V 30 VPP Output Load Voltage From a 2.5V Supply • Integrated Boost Converter Generates 17.5V Supply • Programmable Soft-Start • Small Boost Converter Inductor • Selectable Gain of 21dB, 26dB, and 32.5dB • Selectable Boost Output Voltage of 8V, 12V, and 17.5V • Low Shutdown Current: <1µA • Build in Thermal , OCP ,OVP,Short Protection • Available in Space Saving Packages: 16-ball 1.95mmx1.95mm CSP Package 16-pin QFN4x4 Package Applications Wireless or Cellular Handsets Portable DVD Player Personal Digital Assistants (PDAs ) Electronic Dictionaries Digital Still Cameras PAM8902H Document number: DSxxxxx Rev. 1 - 0 1 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Typical Applications Circuit Pin Descriptions Pin Name PVCC VOUT SW PGND1 OUT+ VSET COMP AVDD OUTGSET VCM AGND PGND2 ENA INN INP Bump (CSP) A1 A2 A3 A4 B1 B2 B3 B4 C1 C2 C3 C4 D1 D2 D3 D4 PAM8902H Document number: DSxxxxx Rev. 1 - 0 Pin Number (QFN) 16 1 2 4 15 3 5 6 14 11 7 8 13 12 10 9 Function Audio Amplifier Power Supply Boost Convertor Output Boost Convertor Switching Node Boost Convertor Power Ground Positive Differential Audio Output Boost Convertor Output Voltage Setting (8V,12V,17.5V) Boost Convertor compensation Power Supply Negative Differential Audio Output Amplifier Gain setting ( 21dB , 26dB , 32.5dB) Common Mode bypass Cap Analog Ground Class D Power Ground Whole chip Enable Negative Differential Audio Input Positive Differential Audio Input 2 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H 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 Input Voltage Storage Temperature Maximum Junction Temperature Soldering Temperature Rating 6.0 -0.3 to VDD +0.3 -65 to 150 150 250, 10sec Unit V °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage Range Ambiient Temperature Range Junction Temperature Range PAM8902H Document number: DSxxxxx Rev. 1 - 0 Rating 2.5 to 5.5 -40 to +85 -40 to +125 Unit V °C 3 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Thermal Information Parameter Symbol Thermal Resistance (Junction to Ambient) θJA Thermal Resistance (Junction to Case) θJC Package CSP QFN4x4-16 CSP QFN4x4-16 Maximum 90 52 72 30 Unit °C/W °C/W Electrical Characteristics (@TA = +25°C, VDD = 3.6V, CL = 1µF, VSET Float, unless otherwise specified.) Symbol VDD IQ Parameter Conditions Input Voltage Quiescent Current Min Typ 2.5 Max Unit 5.5 V mA EN > 1.2V, VSET = High EN > 1.2V, VSET = Floating EN > 1.2V, VSET = GND 30 10 5 48 18 12 1.0 ISD Shutdown Current EN = 0V 0.1 TWU Wake-Up Time EN From Low to High 40 VEH Chip Enable VEL Chip Disable 1.2 0.4 VH GSET/VSET High VDD -0.5 VDD VF GSET/VSET Floating 1 VDD -1 VL GSET/VSET Low 0 0.5 UVLO Under Voltage Lockout Threshold VDD From High to Low 2.2 UVLOH OTP Under Voltage Lockout Hysteresis VDD From Low to High 0.2 OTPH µA mS V V V Thermal Shutdown Threshold 150 °C Thermal Shutdown Lockout Hysteresis 30 °C Boost Converter VSET = GND, No Load 7.2 8.0 8.8 V Output Voltage VSET = NC, No Load 10.8 12.0 13.2 V 16 17.5 19 CL Current Limit Average Input Current RLS Low Side MOSFET RDS(ON) IO = 50mA fOSCB Boost Switching Frequency V O1 V O2 VSET = AVDD, No Load V O3 1.0 V A Ω 0.5 1.1 1.5 1.9 MHz 225 375 475 KHz 50 mV Class-D fOSCD Class-D Amplifier Switching Frequency Input AC-GND CMRR Common Mode Reject Ratio VIN = ±100mV, VDD = 3.6V 60 VOS Output Offset Voltage Output Offset Voltage 5 RP RDS(ON) High Side Low Side 1.5 0.6 GSET = AVDD, VO = 1VRMS 32.5 GSET = AVDD, VO = 1VRMS 26 GSET = AVDD, VO = 1VRMS 21 AV1 AV2 Closed-Loop Voltage Gain AV3 dB Ω Ω dB PSRR Power Supply Reject Ratio 200m VPP Supply Ripple @ 217Hz 70 THD+N Total Harmonice Distortion Plus Noise VO = 5VRMS Input AC Ground, A-Weighting 0.3 % 90 dB SNR Signal to Noise Ratio PAM8902H Document number: DSxxxxx Rev. 1 - 0 4 of 12 www.diodes.com dB December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Typical Operating Characteristics (@TA = +25°C, VDD = 4.2V, Gain = 26dB, CIN = 1µF, CLOAD = 1µF, unless otherwise specified.) PAM8902H Document number: DSxxxxx Rev. 1 - 0 5 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Typical Operating Characteristics (cont.) (@TA = +25°C, VDD = 5V, Gain = 18dB, unless otherwise specified.) PAM8902H Document number: DSxxxxx Rev. 1 - 0 6 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Application Information Select Boost Convertor Output Voltage Customer can use VSET pin to set boost converor output voltage between 8V, 12V and 17.5V. VSET pin configuration table as below: VSET Pin Configuration Min Max PVCC Voltage Audio Amplifier Maximum Output Voltage Connect to AVDD AVDD – 0.5V AVDD 17.5V 11VRMS (VPP = 31.1V) Floating 1V AVDD – 1V 12V 5VRMS (VPP = 22.6V) Connect to GND GND 0.5V 8V 5VRMS (VPP = 14.1V) Input Resistance (RI) The input resistors (RI = RIN + REX) set the gain of the amplifier according to Equation 1 when anti-saturation is inactive. G = 20 Log [12.8*RF/(RIN+REX)] (dB) GSET = VDD GSET RIN 36.5kΩ RF 122.6kΩ GSET = Floating 59kΩ 100kΩ GSET = GND 82kΩ 77.4kΩ Where RIN is a 77.4KΩ internal resistor, REX is the external input resistor, RF is a 122.6KΩ internal resistor. Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used with a tolerance greater than 1%. Place the input resistors very close to the PAM8902H to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set to lower. Lower gain allows the PAM8902H to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. In addition to these features, higher value of RI minimizes pop noise. 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 is a high-pass filter with the corner frequency determined in the follow equation: fC = 1 2πR I CI It is important to consider the value of CI as it directl y affects the low frequency performance of the circuit. For example, when RI is 150kΩ and the specification calls for a flat bass response are down to 150Hz. Equation is reconfigured as followed: CI = 1 2πR IFC When input resistance variation is considered, the CI is 7nF, so 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 + 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. PAM8902H Document number: DSxxxxx Rev. 1 - 0 7 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Application Information (cont.) Decoupling Capacitor The PAM8902H 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. The optimum decoupling is achieved by using two different types of capacitors that target on 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 1µF, is placed as close as possible to the device AVDD pin for the best operation. For filtering lower frequency noise signals, a large ceramic capacitor of 10µF or greater placed near the AVDD supply trace is recommended. External Schottky Diode Use external schottky diode can get the best driving capability and efficiency. Since internal power diode has limited driving capability, only in following conditions customer can remove the external schottky diode to reduce the cost. 1. VSET = GND or Floating and CL less than 1µF. 2. The signal frequency less than 4KHz. 3. Haptic application (50-500Hz) Shutdown Operation In order to reduce power consumption while not in use, the PAM8902H contains shutdown circuitry amplifier off when a logic low is placed on the ENA pin. By switching the ENA pin connected to GND, the PAM8902H supply current draw will be minimized in idle mode. Under Voltage Lock-out (UVLO) The PAM8902H incorporates circuitry designed to detect supply voltage. When the supply voltage drops to 2.2V or below, the PAM8902H goes into a state of shutdown, and the device comes out of its shutdown state and restore to normal function only when reset the power supply or ENA pin. Short Circuit Protection (SCP) The PAM8902H has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorted or outputto-GND shorted occurs. When a short circuit occurs, the dev ice goes into a latch state and must be reset by cycling the voltage on the ENA pin to a logic low and then back to the logic high state for normal operation. This will clear the short-circuit flag and allow for normal operation if the short was removed. If the short was not removed, the protection circuitry will again activate. Over Temperature Protection (OTP) Thermal protection on the PAM8902H prevents the device from damage when the internal die temperature exceeds +150°C. There is a 15°C tolerance on this trip point from device to device. Once the die temperature exceeds the set point, the device will enter the shutdown state and the outputs are disabled, in this condition both OUT+ and OUT- will become high impedance. This is not a latched fault. The thermal fault is cleared once the temperature of the die decreased by 30°C. This large hysteresis will prevent motor boating sound well and the device begins normal operation at this point with no external system interaction. PAM8902H Document number: DSxxxxx Rev. 1 - 0 8 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Ordering Information Part Number PAM8902HZER PAM8902HKER Part Marking BT YW P8902H XXXYW Package Type Standard Package CSP-16L 3000 Units/Tape&Reel QFN4x4-16L 3000 Units/Tape&Reel Marking Information PAM8902H Document number: DSxxxxx Rev. 1 - 0 9 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Package Outline Dimensions (All dimensions in mm.) CSP-16 PAM8902H Document number: DSxxxxx Rev. 1 - 0 10 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H Package Outline Dimensions (All dimensions in mm.) QFN4x4-16 PAM8902H Document number: DSxxxxx Rev. 1 - 0 11 of 12 www.diodes.com December 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM8902H 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). 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. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. 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Copyright © 2012, Diodes Incorporated www.diodes.com PAM8902H Document number: DSxxxxx Rev. 1 - 0 12 of 12 www.diodes.com December 2012 © Diodes Incorporated