TS4995

TS4995 1.2 W fully differential audio power amplifier with selectable standby and 6 dB fixed gain Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Differential inputs 90 dB PSRR @ 217 Hz with grounded inputs Operates from VCC = 2.5 V to 5.5 V 1.2 W rail-to-rail output power @ VCC=5 V, THD+N=1%, F=1 kHz, with an 8 Ω load 6 dB integrated fixed gain Ultra-low consumption in standby mode (10 nA) Selectable standby mode (active low or active high) Ultra-fast startup time: 10 ms typ. at VCC=3.3 V Available in 9-bump flip chip (300 mm bump diameter) Ultra-low pop and click VO- TS4995 - Flip chip 9 Pin connections (top view) Gnd 7 6 5 VO+ Stdby VIN- Bypass VIN+ 8 1 9 2 VCC 4 3 Stdby Mode Applications ■ ■ ■ ■ Mobile phones (cellular / cordless) PDAs Laptop / notebook computers Portable audio devices The TS4995 features an internal fixed gain at 6dB which reduces the number of external components on the application board. The device is equipped with common mode feedback circuitry allowing outputs to be always biased at VCC/2 regardless of the input common mode voltage. The TS4995 is specifically designed for high quality audio applications such as mobile phones and requires few external components. Description The TS4995 is an audio power amplifier capable of delivering 1.2 W of continuous RMS output power into an 8 Ω load at 5 V. Thanks to its differential inputs, it exhibits outstanding noise immunity. An external standby mode control reduces the supply current to less than 10 nA. A STBY MODE pin allows the standby pin to be active high or low. An internal thermal shutdown protection is also provided, making the device capable of sustaining short-circuits. March 2008 Rev 3 1/26 www.st.com 26 Contents TS4995 Contents 1 2 3 4 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 17 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Wake-up time tWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 6 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2/26 TS4995 Absolute maximum ratings and operating conditions 1 Table 1. Symbol VCC Vin Toper Tstg Tj Rthja Pdiss ESD Absolute maximum ratings and operating conditions Absolute maximum ratings (AMR) Parameter Supply voltage (1) Value 6 GND to VCC -40 to + 85 -65 to +150 150 200 Internally limited 200 Unit V V °C °C °C °C/W W V kV mA °C Input voltage (2) Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient (3) Power dissipation MM: machine model (4) HBM: human body model (5) 1.5 200 260 Latch-up Latch-up immunity Lead temperature (soldering, 10sec) 1. All voltage values are measured with respect to the ground pin. 2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V. 3. The device is protected in case of over temperature by a thermal shutdown activated at 150° C. 4. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin combinations with other pins floating. 5. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin combinations with other pins floating. Table 2. Symbol VCC VSM Operating conditions Parameter Supply voltage Standby mode voltage input: Standby Active LOW Standby Active HIGH Standby voltage input: Device ON (VSM=GND) or Device OFF (VSM=VCC) Device OFF (VSM=GND) or Device ON (VSM=VCC) Thermal shutdown temperature Load resistor Thermal resistance junction to ambient Value 2.5 to 5.5 VSM=GND VSM=VCC 1.5 ≤ VSTBY ≤ VCC GND ≤ VSTBY ≤ 0.4 (1) 150 ≥4 100 Unit V V VSTBY TSD RL Rthja V °C Ω °C/W 1. The minimum current consumption (ISTBY) is guaranteed when VSTB Y= GND or VCC (the supply rails) for the whole temperature range. 3/26 Typical application schematics TS4995 2 Typical application schematics Table 3. External component descriptions Functional description Supply bypass capacitor that provides power supply filtering. Bypass capacitor that provides half supply filtering. Optional input capacitor that forms a high pass filter together with Rin. (Fcl = 1 / (2 x π x Rin x Cin) Component Cs Cb Cin Figure 1. Typical application VCC Cs1 1uF 2 TS4995 FlipChip Optional VinP1 330nF Cin2 P2 Vin+ 330nF 8 BYP ASS Cin1 3 VinVo- Vcc TS4995 7 1 Vin+ + BIAS STBY STDBY STDBY MODE GND Vo+ 5 8 Ohms 1uF Cbypass1 4 9 STDBY / Operation VCC 3 1 3 4/26 1 STDBY MODE 2 2 6 TS4995 Electrical characteristics 3 Table 4. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG Electrical characteristics VCC = +5V, GND = 0V, Tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise Power supply rejection ratio with inputs grounded(1) THD = 1% Max, F= 1kHz, RL = 8Ω Po = 850mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF Vripple = 200mVPP F = 217Hz, RL = 8Ω, Cin = 4.7µF, Cb =1µF Vic = 200mVPP A-weighted filter RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz RL = 8Ω 20Hz ≤ F ≤ 20kHz, RL = 8Ω Unweighted A-weighted Unweighted, standby A-weighted, standby 15 5.5 Cb =1µF 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω No input signal, RL = 8Ω 0 0.8 1.2 0.5 90 60 Min. Typ. Max. Unit 4 10 0.1 7 1000 10 4.5 mA nA mV V W % dB dB dB MHz CMRR Common mode rejection ratio SNR GBP Signal-to-noise ratio Gain bandwidth product 100 2 11 7 3.5 1.5 20 6 15 25 6.5 VN Output voltage noise µVRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) kΩ dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 5/26 Electrical characteristics Table 5. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG TS4995 VCC = +3.3V (all electrical values are guaranteed with correlation measurements at 2.6V and 5V), GND = 0V, Tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise Power supply rejection ratio with inputs grounded(1) THD = 1% max, F= 1kHz, RL = 8Ω Po = 300mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF Vripple = 200mVPP F = 217Hz, RL = 8Ω, Cin = 4.7µF, Cb =1µF Vic = 200mVPP A-weighted filter RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz RL = 8Ω 20Hz ≤ F ≤ 20kHz, RL = 8Ω Unweighted A weighted Unweighted, standby A weighted, standby 15 5.5 Cb =1µF 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω No input signal, RL = 8Ω 0.4 300 500 0.5 90 60 Min. Typ. Max. Unit 3 10 0.1 7 1000 10 2.3 mA nA mV V mW % dB dB dB MHz CMRR Common mode rejection ratio SNR GBP Signal-to-noise ratio Gain bandwidth product 100 2 11 7 3.5 1.5 20 6 10 25 6.5 VN Output voltage noise µVRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) kΩ dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 6/26 TS4995 Table 6. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG CMRR SNR GBP Electrical characteristics VCC = +2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise THD = 1% max, F= 1kHz, RL = 8Ω Po = 225mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω No input signal, RL = 8Ω 0.6 200 300 0.5 90 60 Min. Typ. Max. 3 10 0.1 7 1000 10 1.5 Unit mA nA mV V mW % dB dB dB MHz Power supply rejection ratio F = 217Hz, R = 8Ω, Cin = 4.7μF, Cb =1µF with inputs grounded(1) Vripple = 200mVPP Common mode rejection ratio Signal-to-noise ratio Gain bandwidth product F = 217Hz, RL = 8Ω, Cin = 4.7μF, Cb =1µF Vic = 200mVPP A-weighted filter RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz RL = 8Ω 20Hz ≤F ≤20kHz, RL = 8Ω Unweighted A weighted Unweighted, standby A weighted, standby 100 2 11 7 3.5 1.5 15 5.5 20 6 10 25 6.5 VN Output voltage noise µVRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) Cb =1µF kΩ dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 7/26 Electrical characteristics TS4995 Figure 2. 10 THD+N vs. output power Figure 3. 10 THD+N vs. output power Vcc=2.6V THD + N (%) THD + N (%) RL = 8 Ω G = 6dB F = 20Hz Cb = 1 μ F 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V RL = 8 Ω G = 6dB F = 20Hz Cb = 0 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 4. 10 THD+N vs. output power Figure 5. 10 THD+N vs. output power THD + N (%) THD + N (%) RL = 16 Ω G = 6dB F = 20Hz Cb = 1 μ F 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V RL = 16 Ω G = 6dB F = 20Hz Cb = 0 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V Vcc=2.6V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 6. THD+N vs. output power Figure 7. 10 THD+N vs. output power 10 RL = 4 Ω G = 6dB F = 1kHz Cb = 1 μ F BW < 125kHz Tamb = 25 ° C 1 Vcc=2.6V Vcc=5V THD + N (%) THD + N (%) Vcc=3.3V RL = 4 Ω G = 6dB F = 1kHz Cb = 0 BW < 125kHz Tamb = 25 ° C 1 Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 1E-3 0.01 0.1 Output power (W) 1 0.1 1E-3 0.01 0.1 Output power (W) 1 8/26 TS4995 Electrical characteristics Figure 8. 10 THD+N vs. output power Figure 9. 10 THD+N vs. output power Vcc=2.6V THD + N (%) THD + N (%) RL = 8 Ω G = 6dB F = 1kHz Cb = 1 μ F 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V RL = 8 Ω G = 6dB F = 1kHz Cb = 0 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 10. THD+N vs. output power 10 RL = 16 Ω G = 6dB F = 1kHz Cb = 1 μ F 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Figure 11. THD+N vs. output power 10 RL = 16 Ω G = 6dB F = 1kHz Cb = 0 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V 0.1 Vcc=2.6V 0.1 0.01 1E-3 0.01 0.1 1 0.01 1E-3 0.01 0.1 1 Output power (W) Output power (W) Figure 12. THD+N vs. output power 10 RL = 4 Ω G = 6dB F = 20kHz Cb = 1 μ F BW < 125kHz Tamb = 25 ° C 1 Vcc=5V Figure 13. THD+N vs. output power 10 RL = 4 Ω G = 6dB F = 20kHz Cb = 0 BW < 125kHz Tamb = 25 ° C 1 Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V Vcc=2.6V 0.1 1E-3 0.01 0.1 Output power (W) 1 0.1 1E-3 0.01 0.1 Output power (W) 1 9/26 Electrical characteristics TS4995 Figure 14. THD+N vs. output power 10 RL = 8 Ω G = 6dB F = 20kHz Cb = 1 μ F BW < 125kHz Tamb = 25 ° C Vcc=5V Figure 15. THD+N vs. output power 10 RL = 8 Ω G = 6dB F = 20kHz Cb = 0 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V Vcc=2.6V THD + N (%) 1 Vcc=2.6V 1 0.1 1E-3 0.01 0.1 Output power (W) 0.1 1 1E-3 0.01 0.1 Output power (W) 1 Figure 16. THD+N vs. output power 10 RL = 16 Ω G = 6dB F = 20kHz Cb = 1 μ F 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Figure 17. THD+N vs. output power 10 RL = 16 Ω G = 6dB F = 20kHz Cb = 0 1 BW < 125kHz Tamb = 25 ° C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V 0.1 Vcc=2.6V 0.1 0.01 1E-3 0.01 0.1 1 0.01 1E-3 0.01 0.1 1 Output power (W) Output power (W) Figure 18. THD+N vs. frequency 10 RL = 4 Ω G = 6dB Cb = 1 μ F BW < 125kHz Tamb = 25 ° C Figure 19. THD+N vs. frequency 10 RL = 4 Ω G = 6dB Cb = 0 BW < 125kHz Tamb = 25 ° C Vcc=5V, Po=1000mW Vcc=2.6V, Po=280mW 1 THD + N (%) Vcc=5V, Po=1000mW Vcc=2.6V, Po=280mW 1 THD + N (%) 0.1 Vcc=3.3V, Po=500mW 0.1 Vcc=3.3V, Po=500mW 0.01 100 1000 Frequency (Hz) 10000 0.01 100 1000 Frequency (Hz) 10000 10/26 TS4995 Electrical characteristics Figure 20. THD+N vs. frequency 10 RL = 8 Ω G = 6dB Cb = 1 μ F BW < 125kHz Tamb = 25C Figure 21. THD+N vs. frequency 10 RL = 8 Ω G = 6dB Cb = 0 BW < 125kHz Tamb = 25C 1 THD + N (%) Vcc=2.6V, Po=225mW THD + N (%) 1 Vcc=2.6V, Po=225mW Vcc=5V, Po=850mW 0.1 Vcc=3.3V, Po=300mW Vcc=5V, Po=850mW 0.1 Vcc=3.3V, Po=300mW 0.01 100 1000 Frequency (Hz) 10000 0.01 100 1000 Frequency (Hz) 10000 Figure 22. THD+N vs. frequency 10 RL = 16 Ω G = 6dB Cb = 1 μ F BW < 125kHz Tamb = 25C Figure 23. THD+N vs. frequency 10 RL = 16 Ω G = 6dB Cb = 0 BW < 125kHz Tamb = 25C Vcc=5V, Po=500mW 1 THD + N (%) 1 THD + N (%) Vcc=5V, Po=500mW Vcc=2.6V, Po=125mW 0.1 Vcc=2.6V, Po=125mW 0.1 Vcc=3.3V, Po=225mW 0.01 100 1000 Frequency (Hz) Vcc=3.3V, Po=225mW 10000 0.01 100 1000 Frequency (Hz) 10000 Figure 24. Output power vs. power supply voltage 10 Figure 25. Output power vs. power supply voltage 2,4 Cb = 1μF 2,2 F = 1kHz 2,0 BW < 125 kHz 1,8 Tamb = 25°C 1,6 1,4 1,2 1,0 0,8 0,6 0,4 0,2 0,0 2,5 3,0 3,5 4,0 Vcc (V) Output power at 10% THD + N (W) 1 THD + N (%) RL = 16 Ω G = 6dB Cb = 1 μ F BW < 125kHz Tamb = 25C Vcc=5V, Po=500mW 4Ω Vcc=2.6V, Po=125mW 0.1 8Ω 16Ω 32Ω 4,5 5,0 5,5 Vcc=3.3V, Po=225mW 0.01 100 1000 Frequency (Hz) 10000 11/26 Electrical characteristics TS4995 Figure 26. Output power vs. power supply voltage 2,0 Output power at 1% THD + N (W) Figure 27. Power derating curves Flip-Chip Package Power Dissipation (W) Cb = 1μF 1,8 F = 1kHz 1,6 BW < 125 kHz Tamb = 25°C 1,4 1,2 1,0 0,8 0,6 0,4 0,2 0,0 2,5 3,0 3,5 4,0 1.2 1.0 0.8 0.6 0.4 0.2 0.0 No Heat sink Heat sink surface ≈ 1 00mm 2 4Ω 8Ω 16Ω 32Ω 4,5 5,0 5,5 0 25 50 75 100 125 Ambiant Temperature ( ° C) Vcc (V) Figure 28. Output power vs. load resistance 2000 1800 1600 Output power (W) Figure 29. Power dissipation vs. output power 1.4 Vcc=5.5V Vcc=5V Vcc=4.5V Vcc=4V Power Dissipation (W) 1400 1200 1000 800 600 400 200 0 4 6 8 THD+N = 1% F = 1kHz Cb = 1μ F BW < 125kHz Tamb = 25°C Vcc=5V 1.2 F=1kHz THD+N