LPA4732QVF

Preliminary Datasheet LPA4732 215mW TrueCapFree Stereo Headphone Amplifier General Description Features The LPA4732 stereo headphone amplifiers are  2.5V to 5.5V Single-Supply Operation designed for portable equipment where board space is  No Bulky DC-Blocking Capacitors Required at a premium. The LPA4732 deliver up to 215mW per  No Degradation of Low-Frequency Response Due to Output Capacitors  Differential Inputs for Enhanced Noise Cancellation  194mW into 32Ω Load from 5V Power Supply at THD+N = 0.1% (TYP, per Channel) anticlick-and-pop circuitry suppresses audible clicks  Low 0.003% THD+N and pops on startup and shutdown. A low-power  High PSRR (-78dB at 217Hz) shutdown mode reduces the supply current to 0.1µA.  Short-Circuit and Thermal-Overload Protection The LPA4732 operates from a single 2.5V to 5.5V  Integrated Click-and-Pop Suppression supply, consumes only 5mA supply current, and is  Low Quiescent Current (3mA at VDD = 5V) specified over the extended -40 ℃  Enable Control  Under-Voltage Lockout Function  -40℃ to +85℃ Operating Temperature Range  Available in a Space-Saving 16-Pin TQFN (3mm✕ 3mm✕ 0.8mm) Package channel into a 16Ω load or 194mW into a 32Ω load and have low 0.003% THD+N. An 78dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive to +85 ℃ temperature range. The devices are available in tiny 16-pin TQFN (3mm✕ 3mm✕0.8mm) packages. Order Information LPA4732 □ □ □ F: Pb-Free Package Type QV:TQFN-16 Marking Information Device Marking Package Shipping LPA4732 LPS TQFN-16 3K/REEL XXX Applications       LPA4732 MP3 Players Smart/Cellular Phones PDAs Portable Audio Notebook and Desktop PCs Flat-Panel Monitors LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 1 of 10 Preliminary Datasheet LPA4732 Functional Pin Description INL- 1 INL+ 2 OUTL SGND PVDD EN 15 14 13 Pin Configurations 16 Package Type 12 HPVDD 11 CAP+ TQFN-16 CAP- 8 9 HPVSS 4 7 INR- NC PGND 6 10 NC 3 5 INR+ OUTR TQFN Figure 1. The P i n C o n f i g u r a t i o n s Pin Description PIN NAME 1 INL- Inverting left input for differential signals. 2 INL+ Non-inverting left input for differential signals. 3 INR+ Inverting right input for differential signals. 4 INR- Non-inverting right input for differential signals. 5 OUTR 6,7 NC 8 HPVSS 9 CAP- Charge pump negative flying cap. 10 PGND Power Ground. 11 CAP+ Charge pump positive flying cap. 12 HPVDD 13 EN 14 PVDD Power VDD. 15 SGND Amplifier reference voltage. 16 OUTL Left headphone amplifier output. Connect to left terminal of headphone jack. - EP LP4732-00 DESCRIPTION Right headphone amplifier output. Connect to right terminal of headphone jack. No connection. Charge pump output and negative power supply for output amplifiers; connect 1uF capacitor to GND. Positive power supply for headphone amplifiers. Charge pump positive half VDD output. Amplifier enable. Connect to logic low to shutdown; connect to logic high to activate. Exposed Paddle. Electrically connect to PGND or leave unconnected. jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 2 of 10 Preliminary Datasheet LPA4732 Typical Application Circuit Figure 2. Typical Differential Input Application Circuit Figure 3. Typical Single-Ended Input Application Circuit Absolute Maximum Ratings 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. Supply Voltage (PVDD) ……………………………………………………………………………………………………………..…… 6.0V Input Voltage (INR+, INR-, INL+, INL-)........................................................................................ HPVSS-0.3V to HPVDD+0.3V Control Interface Voltage……………......................................................................................................... -0.3V to PVDD+0.3V Junction Temperature ................................................................................................................................................... +150℃ Storage Temperature Range ........................................................................................................................... -65℃ to +150℃ Lead Temperature (Soldering, 10s) .............................................................................................................................. +260℃ ESD Susceptibility HBM ................................................................................................................................................ 2000V HBM (Output pins to Supply and Ground pins) ……………………………………………………………………………………. 2000V LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 3 of 10 Preliminary Datasheet LPA4732 Recommended Operating Conditions Supply Voltage Range ………………………………………………………………………………………………………….. 2.5V to 5.5V Operating Temperature Range ........................................................................................................................... -40℃ to +85℃ Electrical Characteristics TA=25°C, PVDD=3.6V, RL=16Ω (unless otherwise noted) Parameter Symbol Condition Min Typ Max Units 5.5 V GENERAL Supply Voltage Range PVDD 2.5 Quiescent Supply Current IQ EN=PVDD, No load Shutdown Supply Current ISD EN=0V, PVDD=2.5V to 5.5V EN Input Logic High VIH EN Input Logic Low VIL EN to Full Operation Time tSON 3 0.1 mA 1 1 μA V 0.6 1.6 V ms AMPLIFIERS Output Offset Voltage Common Mode Rejection Ratio Power Supply Rejection Ratio Output Power Vos CMRR PSRR POUT Between OUTL(OUTR) and GND, input 0.2 AC-coupled to ground. Input referred, LPA4732, TA = +25°C -70 -86 DC, VDD = 2.5V to 5.5V, input referred -80 -90 f = 217Hz, 100mVP-P ripple, input referred -80 f = 10kHz, 100mVP-P ripple, input referred -60 RL = 16Ω, THD+N = 1%, TA = +25°C 115 RL = 32Ω, THD+N = 1%, TA = +25°C 105 Output Impedance in Shutdown Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio 10 THD+N SNR RL = 16Ω, POUT = 55mW, f = 1kHz 0.008 RL = 32Ω, POUT = 125mW, f = 1kHz 0.007 RL = 32Ω, POUT = 20mW, f = 22Hz to 22kHz 2 mV dB dB mW kΩ % 100 dB 7 µVRMS 200 pF 500 kHz 80 dB Thermal Shutdown Threshold 145 ℃ Thermal Shutdown Hysteresis 5 ℃ Noise Vn 22Hz to 22kHz bandwidth, input AC Capacitive Drive CL No sustained oscillation Charge-Pump Oscillator Crosstalk Note Note Note Note 47 fOSC RL = 32Ω, VIN = 200mVP-P, f = 10kHz, AV = 1 1: All specifications are 100% tested at TA = +25°C; temperature limits are guaranteed by design. 2: Gain for the LPA4732 is adjustable. 3: The amplifier inputs are AC-coupled to ground through CIN_. 4: Measurement bandwidth is 22Hz to 22kHz. LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 4 of 10 Preliminary Datasheet LPA4732 Typical Operating Characteristic Audio Precision 06/30/17 17:42:54 10 5 2 1 0.5 % 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 3m 5m 10m 20m 50m 100m 200m 300m W Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 4 5 1 1 1 1 1 Cyan Green Yellow Red Magenta Solid Solid Solid Solid Solid 3 3 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left Left Left 3.0V,16ohm 3.3V,16ohm 3.7V,16ohm 4.2V,16ohm 5.0V,16ohm Figure 4. THD+N VS Output Power，Freq=1kHz，RL=16Ω Audio Precision 06/30/17 16:45:34 10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 3m 5m 10m 50m 20m 100m 300m W Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 4 5 1 1 1 1 1 Cyan Green Yellow Red Magenta Solid Solid Solid Solid Solid 3 3 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left Left Left 3.0V,32ohm 3.3V,32ohm 3.7V,32ohm 4.2V,32ohm 5.0V,32ohm Figure 5. THD+N VS Output Power，Freq=1kHz，RL=32Ω LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 5 of 10 Preliminary Datasheet Audio Precision LPA4732 07/14/17 10:49:53 1 0.5 0.2 0.1 0.05 % 0.02 0.01 0.005 0.002 0.001 0.0006 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Cyan Green Yellow Solid Solid Solid 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left PVDD=3V,RL=16ohm,PO=5mW PVDD=3V,RL=16ohm,PO=20mW PVDD=3V,RL=16ohm,PO=40mW Figure 6. THD VS Frequency, PVDD=SVDD=3V，RL=16Ω Audio Precision 07/14/17 10:43:45 1 0.5 0.2 0.1 0.05 % 0.02 0.01 0.005 0.002 0.001 0.0006 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Cyan Green Yellow Solid Solid Solid 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left PVDD=5V,RL=16ohm,PO=5mW PVDD=5V,RL=16ohm,PO=20mW PVDD=5V,RL=16ohm,PO=80mW Figure 7. THD VS Frequency, PVDD=SVDD=5V，RL=16Ω LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 6 of 10 Preliminary Datasheet Audio Precision LPA4732 07/14/17 10:18:59 1 0.5 0.2 0.1 0.05 % 0.02 0.01 0.005 0.002 0.001 0.0006 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Cyan Green Yellow Solid Solid Solid 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left 3V,32ohm,5mW 3V,32ohm,20mW 3V,32ohm,40mW Figure 8. THD VS Frequency, PVDD=SVDD=3V，RL=32Ω Audio Precision 07/14/17 10:09:32 1 0.5 0.2 0.1 0.05 % 0.02 0.01 0.005 0.002 0.001 0.0006 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Cyan Green Yellow Solid Solid Solid 3 3 3 Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Analyzer.THD+N Ratio A Left Left Left 5V,32ohm,5mW 5V,32ohm,20mW 5V,32ohm,80mW Figure 9. THD VS Frequency, PVDD=SVDD=5V，RL=32Ω LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 7 of 10 Preliminary Datasheet Audio Precision LPA4732 07/14/17 10:25:25 +12 +11 +10 +9 +8 d B V +7 +6 +5 +4 +3 +2 +1 +0 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 1 1 Cyan Green Solid Solid 3 3 Analyzer.Level A Analyzer.Level A Left Left PVDD=5V,RL=32ohm,THD=1% PVDD=5V,RL=32ohm,THD=0.1% Figure 10. Output Amplitude VS Frequency，PVDD=SVDD=5V，RL=32Ω Application Information Maximum Gain Input Coupling Capacitors The LPA4732 has two internal amplifier stages. The Input coupling capacitors block any DC bias from the first stage's gain is externally configurable, while the audio source and ensure maximum dynamic range. second stage's is internally fixed. The closed-loop gain Input coupling capacitors also minimize LPA4732 of the first stage is set by selecting the ratio of Rf to turn-on pop to an inaudible level. Ri while the second stage's gain is fixed at 2x.The The input capacitors are in series with LPA4732 output of amplifier 1 serves as the input to amplifier 2, internal input resistors, creating a high-pass filter. The thus the two amplifiers produce signals identical in following Equation calculates the high-pass filter magnitude, corner frequency. but different in phase by 180°. Consequently, the differential gain for the IC is AV=20*log [2*Rf/(Ri+10)] Rf= 10 k Ω±10% LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com f= 1 2πR IN CIN www.lowpowersemi.com Page 8 of 10 Preliminary Datasheet LPA4732 Charge Pump Flying Capacitor, HPVDD Capacitor deactivate the LPA4732; set to 1.0 V or higher to and HPVSS Capacitor activate. The LPA4732 uses a built-in charge pump to generate Layout Recommendations a positive and negative voltage supply for the headphone amplifiers. The charge pump flying capacitor connects between CAP+ and CAP-. It transfers charge to generate the positive and negative supply voltage. The HPVDD capacitor or HPVSS capacitor must be at least equal in or larger than value to the flying capacitor to allow maximum charge transfer. Use low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for best performance) to maximize charge pump efficiency. Typical values are 1uF for the HPVDD, Exposed PAD On LPA4732 Solder the exposed metal pad on the LPA4732 TQFN package to the landing pad on the PCB. Connect the landing pad to ground or leave it electrically unconnected(floating). Do not connect the landing pad to PVDD or to any other power supply voltage. If the pad is grounded, it must be connected to the same ground as the PGND pin 9. Soldering the thermal pad is required for mechanical reliability and enhances thermal conductivity of the package. GND Connections HPVSS and flying capacitors. The SGND pin is an input reference and must be Power Supply Decoupling Capacitors connected to the headphone ground connector pin. The LPA4732 TureCapFree headphone amplifier This ensures no turn-on pop and minimizes output requires adequate power supply decoupling to ensure offset voltage. Do not connect more than±0.3 V to that output noise and total harmonic distortion (THD) SGND. remain low. Use good low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for best performance). Place a 2.2uF PGND is a power ground. Connect supply decoupling capacitors for PVDD, HPVDD, and HPVSS to PGND. capacitor within 5 mm of the PVDD pin. Reducing the distance between the decoupling capacitor and PVDD minimizes parasitic inductance and resistance, improving LPA4732 supply rejection performance. Use 0402 or smaller size capacitors if possible. Power Supply Sequencing Use input coupling capacitors to ensure inaudible turn-on pop. Activate the LPA4732 after all audio sources have been activated and their output voltages have settled. On power-down , deactiate the LPA4732 before deactivating the audio input source. The EN pin controls device shutdown: Set to 0.6 V or lower to LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 9 of 10 Preliminary Datasheet LPA4732 Packaging Information TQFN-16 LP4732-00 jul.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 10 of 10