PAM8902HZER

NOT RECOMMENDED FOR NEW DESIGN CONTACT US 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 Converter 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. The 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. The 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: 1.2V, VSET = High — 30 48 VEN > 1.2V, VSET = Floating — 10 18 VEN > 1.2V, VSET = GND — 5 12 mA ISD Shutdown Current VEN = 0V — 0.1 1.0 µA tWU Wake-Up Time VEN From Low to High — 40 — ms VEH Chip Enable — 1.2 — — VEL Chip Disable — — — 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 Under Voltage Lockout Hysteresis VDD From Low to High — 0.2 — Thermal Shutdown Threshold — — +150 — °C — — +30 — °C VSET = GND, No Load 7.2 8.0 8.8 V VSET = NC, No Load V OTP Thermal Shutdown Lockout Hysteresis OTPH Boost Converter V O1 V O2 Output Voltage V O3 V V V 10.8 12.0 13.2 VSET = AVDD, No Load 16 17.5 19 V CL Current Limit Average Input Current — 1.0 — A RLS Low Side MOSFET RDS(ON) IO = 50mA — 0.5 — Ω fOSCB Class-D Boost Switching Frequency — 1.1 1.5 1.9 MHz fOSCD Class-D Amplifier Switching Frequency Input AC-GND 225 375 475 kHz CMRR Common Mode Reject Ratio VIN = ±100mV, VDD = 3.6V — 60 — dB Output Offset Voltage Output Offset Voltage — 5 50 mV RDS(ON) High Side Low Side — — 1.5 0.6 — — Ω Ω GSET = AVDD, VO = 1VRMS — 32.5 — GSET = AVDD, VO = 1VRMS — 26 — GSET = AVDD, VO = 1VRMS — 21 — VOS RP AV1 AV2 Closed-Loop Voltage Gain AV3 dB PSRR Power Supply Reject Ratio 200m VPP Supply Ripple @ 217Hz — 70 — THD+N Total Harmonious Distortion Plus Noise VO = 5VRMS — 0.3 — % Signal to Noise Ratio Input AC Ground, A-Weighting — 90 — dB SNR PAM8902H Document number: DS36453 Rev. 4 - 3 4 of 12 www.diodes.com dB March 2021 © Diodes Incorporated PAM8902H Typical Operating Characteristics (@TA = +25°C, VDD = 4.2V, Gain = 26dB, CIN = 1µF, CLOAD = 1µF, unless otherwise specified.) PAM8902H Document number: DS36453 Rev. 4 - 3 5 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Typical Operating Characteristics (continued) (@TA = +25°C, VDD = 5V, Gain = 18dB, unless otherwise specified.) PAM8902H Document number: DS36453 Rev. 4 - 3 6 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Application Information Select Boost Converter Output Voltage Customer can use VSET pin to set boost converter 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 RIN RF 122.6kΩ GSET = VDD 36.5kΩ 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 directly 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: DS36453 Rev. 4 - 3 7 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Application Information (continued) 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 to 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 output-toGND 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: DS36453 Rev. 4 - 3 8 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Ordering Information PAM8902H X X Package Type Z: CSP-16L K: QFN4x4-16L Part Number PAM8902HZER PAM8902HKER Part Marking BT YW P8902H XXXYW Shipping & Package R: Tape & Reel Package Type Standard Package CSP-16L 3000 Units/Tape and Reel QFN4x4-16L 3000 Units/Tape and Reel Marking Information PAM8902H Document number: DS36453 Rev. 4 - 3 9 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Package Outline Dimensions (All dimensions in mm.) CSP-16L PAM8902H Document number: DS36453 Rev. 4 - 3 10 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H Package Outline Dimensions (All dimensions in mm.) QFN4x4-16L PAM8902H Document number: DS36453 Rev. 4 - 3 11 of 12 www.diodes.com March 2021 © Diodes Incorporated PAM8902H IMPORTANT NOTICE 1. DIODES INCORPORATED AND ITS SUBSIDIARIES (“DIODES”) MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes products. 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