Preliminary Datasheet LPA2164A 6W Class- F Audio Amplifier With Boost Convertor Integrated General Description Features The LPA2164A is a 6W, class-F audio amplifier with Integrated boost convertor boost convertor integrated. It offers low THD+N, allowing Shutdown current:<3uA it sound Switch on current :3.0A reproduction. The new filterless architecture allows the Internal Compensation device to drive the speaker directly requiring no low-pass Max duty cycle: 90% output filters, thus to save the system cost and PCB area. 480KHz fixed frequency switching for amplifier work at class_D mode and 900KHz for step up convertor POUT at 10% THD+N，VIN=3.7V for boost convertor to achieve high-quality Power Supply With high performance inductor and diode，the boost convertor can offer 3A switch on current for load. It can RL=4Ω，POUT=4.8W，boost to 6.0V for amplifier provide up to 6.0V stable DC voltage for amplifier so that it can display 6W output at 10% THD with a 3Ù load. When it provides 5.0V DC voltage, it can provide 3.1W RL=4Ω，POUT=3.1W，boost to 5.0V for amplifier POUT at 1% THD+N，VIN=3.7V for boost convertor RL=4Ω，POUT=3.6W，boost to 6.0V for amplifier output at 10% THD with a 4Ù load. The LPA2164A also RL=4Ω，POUT=1.8W，boost to 5.0V for amplifier Filterless, Low Quiescent Current and Low EMI Amplifier Efficiency up to 84% Excellent POP&CLICK rejection suppression for FR signal. The LPA2164A is available in OCP, OTP features SOP-16. Few External Components to Save the Space and cost Order Information Free LC filter digital modulation, direct-drive speakers Pb-Free Package can work at class-AB mode which make LPA2164A could apply to device with radio receiver. The other character of LPA2164A contact OCP 、 OTP and LPA2164A □ □ □ high noise F: Pb-Free Package Type SO: SOP-16 Marking Information Device Marking Package Shipping LPA2164ASOF LPS SOP-16 3K/REEL LPA2164A Applications Portable Bluetooth Speaker Cellular and Smart mobile phone Square Speaker LPA2164A–00 Version 1.0 May.-2013 YWX Y: Y is year code. W: W is week code. X: X is series number. Email: [email protected] www.lowpowersemi.com Page 1 of 15 Preliminary Datasheet LPA2164A Typical Application Circuit L1 4.7uH VCC C1 104 C2 22uF 2 3 5 D 9 MODE 6 VDD C5 470uF C4 104 R2 11 OUT- 10 R7 SPEAKER INPUT-P 8 OUT+ IN+ R6 GND 12 13 AGND 4 PGND 1 16 FB VIN 2 15 NC EN 3 14 SW AGND 4 13 OUT+ SD 5 12 GND BYP 6 11 VDD IN- 7 10 OUT- IN+ 8 9 MODE Version 1.0 May.-2013 C3 10uF C11 105 7 IN- C8 16 BYP C7 105 C9 OPTIONAL LPA2164A AB LPA2164A–00 FB R1 SD ON INPUT-N C6 22pF 14 SW EN OFF OFF 10nF SS34 VIN C10 105 ON 10R Email: [email protected] www.lowpowersemi.com Page 2 of 15 Preliminary Datasheet LPA2164A Functional Pin Description Pin No. 1 PIN Name PGND DESCRIPTION 2 VIN Power supply for boost convertor. 3 EN Enable pin for boost convertor. Active high. 4 AGND 5 SD 6 BYP 7 IN- Negative input of amplifier. 8 IN+ Positive input of amplifier. 9 MODE Class_AB and class_D mode switch pin. Choice class_D mode with high voltage. 10 OUT- Negative output of amplifier. 11 VDD Power supply for amplifier. 12 GND Ground for amplifier. 13 OUT+ Positive output of amplifier. 14 SW Switch pin for boost convertor. 15 NC No connection. 16 FB Feedback pin. Power ground pin. Analog power ground for boost convertor. Amplifier Shutdown pin. Active high. Bypass pin. Connect a 1uF capacitor to ground. Absolute Maximum Ratings Supply voltage for boost convertor -------------------------------------------------------------------------- -0.3V to 6V Supply voltage for amplifier --------------------------------------------------------------------------------- Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------------- Storage Temperature Range ---------------------------------------------------------------------------- −65°C to 150°C Operation Junction Temperature Range -------------------------------------------------------------- −40°C to 125°C Operation Ambient Temperature Range----------------------------------------------------------------- Maximum Junction Temperature Range---------------------------------------------------------------------------- -0.3V to 6.5V 260°C −40°C to 85°C 125°C Recommended Operating Conditions Supply voltage for boost convertor -------------------------------------------------------------------------- 2.5V to 5.0V Supply voltage for amplifier ---------------------------------------------------------------------------------- 2.5V to 6.0V Thermal Information Parameter Symbol Package Maximum Units Thermal resistance (junction to ambient) θJA SOF16 80 ℃/W Thermal resistance (junction to case) θJC SOF16 36 ℃/W LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 3 of 15 Preliminary Datasheet LPA2164A Electrical Characteristics For Amplifier (TA = 25° C, unless otherwise specified) Parameter Symbol Supply power Output power VIN PO Power supply ripple rejection PSRR Signal-to-nois e ratio SNR Eifficency Quiescent current Shutdown current Offset output voltage Frequency for class_D LPA2164A–00 Test Conditions Min Typ Class-D 2.5 THD+N=10%, f=1KHz,RL=4Ω VDD=6.0V 4.8 4.7 VDD=5.0V 3.2 3.2 THD+N=10%, f=1KHz,RL=3Ω VDD=6.0V 6.0 5.9 VDD=5.0V 3.8 3.7 THD+N=1%, f=1KHz,RL=4Ω VDD=6.0V 3.4 3.6 VDD=5.0V 2.5 2.6 THD+N=1%, f=1KHz,RL=3Ω VDD=6.0V 4.8 4.7 VDD=5.0V 3.1 3.2 INPUT ac-grounded with CIN=0.47uF, VDD=6.0V f=100HZ Units 6.0 V W dB f=1KHz 50 f=1KHz 90 η RL=4Ω,PO=0.6W f=1KHz 88 IQ VDD=5.0V No load 91 7 2 VDD=5.0V, VSD =0V fsw 1.1 mA uA 2 480 Email: [email protected] dB % 4.65 ISD Version 1.0 May.-2013 Max 75 VDD=5V,POUT=0.5W,RL =2Ω VOS Class-AB www.lowpowersemi.com mV KHz Page 4 of 15 Preliminary Datasheet LPA2164A Electrical Characteristics For Boost Convertor (VIN=3.6V,VOUT=5V,CIN=22uF,COUT=22uF//10uF,L=4.7uH) Parameter Conditions Supply Voltage Boost of LPA2164A Min 2.2 Output Voltage Range 6 Supply Current(Shutdown) VEN=VOUT=0V, VIN=5V Supply Current VEN=VIN=3.6V, VFB=0.6V Feedback Voltage Feedback Input Current Typ 0.588 0.6 Units Max 5.5 V 6.5 V 1 uA 150 uA 0.612 V 50 nA VFB=0.6V Switching Frequency 900 KHz Maximum Duty Cycle 90 % EN Input Low Voltage 0.4 EN Input High Voltage 1.4 Limit current of power MOSFET RDS(ON) LPA2164A–00 VOUT=3.3V Version 1.0 May.-2013 Email: [email protected] V V 3 A 100 mΩ www.lowpowersemi.com Page 5 of 15 Preliminary Datasheet LPA2164A Typical Operating Characteristic For Amplifier Audio Precision +30 +30 +25 +25 d B r +20 +20 +15 +15 d B r A +10 +10 B +5 +5 +0 20 50 100 200 500 1k 2k 5k 10k 20k +0 Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Cyan Blue Solid Solid 1 7 Analyzer.Level A Analyzer.Level B Left Right Rapid (<2 seconds) frequency response measurement. Can be even faster if the lowest frequencies are not included. Press F4 to set the 1kHz dbr A and dBr B reference. Optimize for a detailed view. A-A FREQ RESP FAST @ 4ohm PO=4.8W CLASS AB VDD=6V.ats2 Audio Precision +30 +30 +25 +25 d B r +20 +20 +15 +15 d B r A +10 +10 B +5 +5 +0 20 50 100 200 500 1k 2k 5k 10k 20k +0 Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Cyan Blue Solid Solid 1 7 Analyzer.Level A Analyzer.Level B Left Right Comment Rapid (<2 seconds) frequency response measurement. Can be even faster if the lowest frequencies are not included. Press F4 to set the 1kHz dbr A and dBr B reference. Optimize for a detailed view. A-A FREQ RESP FAST @ 4ohm PO=4.8W CLASS D VDD=6V.ats2 LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 6 of 15 Preliminary Datasheet Audio Precision LPA2164A A-A THD+N vs FREQUENCY 10 10 1 1 0.1 0.1 0.01 0.01 0.001 0.001 % % 0.0001 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k 0.0001 Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Cyan Blue Solid Solid 1 7 Analyzer.THD+N Ratio B Analyzer.THD+N Ratio B Left Right Comment A single sweeps produces a stereo THD+N sweep of Ch A and Ch B when data 1 is set for THD+N and the Stereo box is checked. The upper Analyzer bandwidth is 20kHz. At a 6kHz fundamental only the 2nd and 3rd harmonics are included, above 10kHz only the noise is included in the measurement bandwidth. For band-limited systems IMD testing is better. A-A THD+N VS FREQ @4ohm PO=3W CLASS D VDD=6V.ats2 Audio Precision A-A THD+N vs FREQUENCY 10 10 1 1 0.1 0.1 % % 0.01 0.01 0.001 0.001 0.0001 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k 0.0001 Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Cyan Blue Solid Solid 1 7 Analyzer.THD+N Ratio B Analyzer.THD+N Ratio B Left Right Comment A single sweeps produces a stereo THD+N sweep of Ch A and Ch B when data 1 is set for THD+N and the Stereo box is checked. The upper Analyzer bandwidth is 20kHz. At a 6kHz fundamental only the 2nd and 3rd harmonics are included, above 10kHz only the noise is included in the measurement bandwidth. For band-limited systems IMD testing is better. A-A THD+N VS FREQ @4ohm PO=3W CLASS AB VDD=6V.ats2 LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 7 of 15 Preliminary Datasheet LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] LPA2164A www.lowpowersemi.com Page 8 of 15 Preliminary Datasheet LPA2164A Typical Operating Characteristic For Boost Convertor Vin=3.3V Vout=5V, 0mA Vin=3.3V Vout=5V, 50mA Vin=3.3V Vout=5V, 100mA Vin=3.3V Vout=5V, 2A Start up wave LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 9 of 15 Preliminary Datasheet LPA2164A Applications Information(for Amplifier) recommended, placing it near the audio power Maximum Gain amplifier. The LPA2164A has two internal amplifier stages. Short Circuit Protection (SCP) 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 serves as the input to amplifier 2, thus the two amplifiers produce signals The LPA2164A has short circuit protection circuitry on the outputs to prevent damage to the device when output-to-output or output-to-GND short occurs. When a short circuit is detected on the outputs, the outputs are disabled immediately. If the short was removed, the device activates again. identical in magnitude, but different in phase by 180°. Over Temperature Protection Consequently, the differential gain for the IC is Thermal protection on the LPA2164A prevents the Av=20*log [2*(Rf/Ri)] device The LPA2164A sets maximum: temperature exceeds 150℃. There is a 15 degree from damage when the internal die Rf= 280 k ±10% Class-AB tolerance on this trip point from device to device. Rf= 280 k ±10% Class-D Once the die temperature exceeds the thermal set Shutdown operation point, the device outputs are disabled. This is not a In order to reduce power consumption while not in latched fault. The thermal fault is cleared once the use, the LPA2164A contains shutdown circuitry to temperature of the die is reduced by 30℃. This large turn off the amplifier's bias circuitry. This shutdown hysteresis will prevent motor boating sound well and feature turns the amplifier off when logic high is the device begins normal operation at this point applied to the SD pin. By switching the SD pin without external system intervention. connected to high voltage, the LPA2164A supply current draw will be minimized in idle mode. Analog Reference Bypass Capacitor (CBYP) Power supply decoupling In addition to system cost and size, click and pop The LPA2164A is a high performance CMOS audio performance is affected by the size of the input amplifier that requires adequate power supply coupling capacitor, CBYP. A larger input coupling decoupling to ensure the output THD and PSRR a capacitor requires more charge to reach its quiescent low as possible. Power supply decoupling affects low DC voltage (nominally 1/2 VDD). This charge comes frequency is from the internal circuit via the feedback and is apt to achieved by using two capacitors of different types create pops upon device enable. Thus, by minimizing targeting to different types of noise on the power the capacitor size based on necessary low frequency supply leads. For higher frequency transients, spikes, response, turn-on pops can be minimized. or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1.0ìF, works best, placing it as close as possible to the device VDD terminal. For The Analog Reference Bypass Capacitor (CBYP) is response. Optimum decoupling filtering lower- frequency noise signals, a large capacitor of LPA2164A–00 20ìF (ceramic) Version 1.0 May.-2013 or greater is the most critical capacitor and serves several important functions. During start-up or recovery from shutdown mode, CBYP determines the rate at which the amplifier starts up. The second function is to reduce noise caused by the power supply coupling Email: [email protected] www.lowpowersemi.com Page 10 of 15 Preliminary Datasheet LPA2164A into the output drive signal. This noise is from the both power switches are off. There is no current path internal analog reference to the amplifier, which from SW to OUT. Therefore, the output voltage appears as degraded PSRR and THD+N. discharges to ground. When the boost convertor is enabled (EN=High), a limited start-current charges How to reduce EMI the output voltage rising to SW, then TH part A simple solution is to put an additional capacitor operates in force PWM mode for regulating the 220pF at power supply terminal for power line. The output voltage to the target value. At the beginning of traces from amplifier to speakers should design as each cycle, the N-channel MOSFET switch is turned short as we can. on, forcing the inductor current to rise. The current at the source of the switch is internally measured and converted to a voltage by the current sense amplifier. That voltage is compared to the error voltage. When the inductor current rises sufficiently, the PWM comparator turns off the switch, forcing the inductor current to the output capacitor which forces the inductor current to decrease. The peak inductor current is controlled by the error voltage. Thus the Applications Information(for Boost) output voltage controls the inductor current to satisfy The LP2164A integrates a 1200KHz fixed frequency, the lode. current-mode regulation architecture to regulate the Setting the Output Voltage boost convertor output voltage. The LP2164A Set the output voltage by selecting the resistive measures the output voltage through an external voltage divider ratio. The voltage divider drops the resistive voltage divider and compares that to the output voltage to the 0.6V feedback voltage. Use a internal 0.6V reference to generate the error voltage 100K resistor for R2 of the voltage divider. Determine to the inductor current to regulate the output voltage. the high-side resistor R1 by the equation: The use of current-mode regulation improves Vout=(R1/R2+1) x VFB transient response and control loop stability. Vout=(R1/R2+1) x 0.6V When the boost convertor is disabled (EN=Low), LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 11 of 15 Preliminary Datasheet LPA2164A PCB Layout notices 1, In the path of the power supply, plus a 1uF and a 10uF 5, GND and VDD should be put independently, to ground high-frequency filter capacitor. These caps can high-power signals to avoid interference. be connected to the thermal pad directly for an excellent 6, If you want to pursue as large as the effect of power, a ground connection. Consider adding a small, good quality large selection of speakers or sound chamber with low low ESR ceramic capacitor may achieve better sound resistance (such as 3.6Ù) speakers, or added to improve the supply voltage boost circuit. 7, Including the line between large current cell and chip, effects. 2, Large (470 µF or greater) bulk power supply decoupling capacitors should be placed near the LPA2164A on the VDD supplies. Local, high-frequency bypass capacitors should be placed as close to the VDD pins as possible. 3, The power line, ground line and filter capacitor and bypass capacitors as close to the chip's pins, remember not to put the capacitor on the back of the board, through tiny holes through the jumper even over. Keep the current loop from each of the outputs through the ferrite bead and the small filter cap and back to PGND as small and tight as possible. The size of this current loop determines its effectiveness as an antenna. 4, Power, ground, and a large current line must try to be wide enough, if you want to add vias, the number of through-holes must be at least 6. The thermal pad must be soldered to the PCB for proper thermal performance and optimal reliability. the inductor should be as close and short as possible to chip for a high performance. Adding a coil to this pin would be helpful for EMI certification. If there is a high standards needed in LPA2164A application, we could add a coil and capacitor between chip and speaker constituting a LC filter which coil would be 100MHz, 100~150Ω and its DCI beyond 3A placing as close as possible to chip, the capacitor should be 1nF connecting the PGND. 8, The position under the amplifier chip on the board must be added vents and large areas of exposed copper and tin to enhance heat dissipation. 9, In case of fixed gain and meeting demand, it should make CIN small as possible as we can because it constitute a high through filter with Rin which cutoff frequency is 1/2*3.414*Cin*Rin. A high capacitance cap could make POP worse. PCB LAYOUT LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 12 of 15 Preliminary Datasheet LPA2164A Recommend Application Case1: Bluetooth Speaker Box—— Charge(1A) + 5W Class F Amplifier CHARGE VIN C18 22uF 1 ACIN BATT 6 C19 10uF R11 1KΩ LP28019SPF GND LED 2 CHRG_S ISETA L1 4.7uH Battery C1 104 C2 22uF 4,9 2 C12 105 ON 5 3 OFF Rset OFF SD 5 ON D MODE 9 AB C7 105 IN+ 8 R7 IN- 7 C9 SS34 VIN Version 1.0 May.-2013 FB EN SD R1 C6 22pF 14 SW VDD OPTIONAL 16 C3 10uF C5 470uF C4 104 R2 11 C11 105 LPA2164A MODE OUT- BYP OUT+ 10 R6 13 IN+ INGND AGND 12 LPA2164A–00 10nF SPEAKER 6 C10 10R Email: [email protected] 4 PGND 17 www.lowpowersemi.com Page 13 of 15 Preliminary Datasheet LPA2164A Case2: Bluetooth Speaker Box with Power Bank—— Charge(1A) +Boost(2A) +(2×5W) Class F Amplifier CHARGE VIN C18 22uF 1 BATT ACIN LP28019SPF GND LED 2 ISETA CHRG_S Battery 6 C19 10uF R11 1KΩ L1 4.7uH C1 104 C2 22uF 2 4,9 C12 105 ON 5 3 OFF Rset OFF SD 5 ON D MODE 9 AB C7 105 VBUS D+ D- COUT 7,8 VIN VOUT LX R1 6 GND FB INL+ 3 8 C8 1,2 7 2.2nF CIN LP6253H R61 INL- L SS34 VIN VREFN GND 5 EN 4 R1 C6 22pF 14 SW FB EN VDD OPTIONAL 16 C3 10uF C5 470uF C4 104 R2 11 C11 105 SD LPA2164A MODE OUT- BYP OUT+ 10 C9 13 IN+ IN- R6 GND 2Ω R2 10nF SPEAKER 6 Power Bank Output：5V 10R AGND 12 PGND 4 17 Chip Enable 9 L12 4.7uH C12 104 C22 22uF 2 C122 105 ON 3 OFF OFF 5 D 9 ON AB 6 C72 105 INR+ 8 C42 10R 10nF SS34 C62 22pF 14 SW VIN FB SD LPA2164A MODE VDD R62 C52 470uF C42 104 R22 11 C112 105 BYP IN+ OUT- 10 SPEAKER 7 INC92 16 R12 C32 10uF EN R612 INR- OPTIONAL OUT+ GND AGND 12 13 PGND 4 17 Classical Application Charger Boost Amplifier LP28056S(1A Linear Charger, ESOP8) LP6253H(2.4A Synchronous Boost, ESOP8) LPA2173(8W Class_F, EQ, ESOP8) LP28019(1A Linear Charger, ESOP8) LP6212(2A Boost, ESOP8 & SOT23-6) LPA2174(8W Differential Input, ESOP8) LP28301(5A Switch Charger, QFN28) LP6255(External MOS, Syn, TQFN-20) LPA2164A(6W Class_F with Boost, EQ, SOP16) LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 14 of 15 Preliminary Datasheet LPA2164A Packaging Information SOP-16 LPA2164A–00 Version 1.0 May.-2013 Email: [email protected] www.lowpowersemi.com Page 15 of 15