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ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 1 ? ? features ? 3.3w stereo into 4 ? from 5.5v power supply at thd+n = 10% (typ.). ? 2.0w stereo into 8 ? from 5.5v power supply at thd+n = 10% (typ.). ? 2.5v~5.5v power supply. ? low shutdown current. ? low quiescent current. ? output pin short-circuit protection and automatic recovery. ? over-heat protection and automatic recovery. ? minimum external components. ? no output filter required for inductive loads. ? low noise during turn-on and turn-off transitions. ? lead free and green package available. (rohs compliant) ? package : 10pin 150mil msop (without thermal pad) available. ? application ? portable electronic devices. ? mobile phones. ? usb audio. ? speaker docking. ? bluetooth speaker. ? general description the ly8209 is a high efficiency, high quality 3.3w stereo class d audio power amplifier. it is a low noise, filterless pwm architecture eliminates the output filter, reducing external component count, system cost, and simplify design. the device is designed to meet of multimedia application includes mobile phones mini speaker and other portable electronic devices. the ly8209 is a single 5.5v power supply, it is capable of driving 4 ? speaker load at a continuous average output of 3.3w/ch with 10% thd+n. the device also features an internal thermal shutdown protection and output pin short-circuit protection prevent the device from damage during fault conditions. the ly8209 is easily to be used in various portable applications and products. ? pin configuration
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 2 ? ? pin description pin no. symbol msop10 description inr 1 input of right channel. shutdown 2 shutdown control pin. (when low level is shutdown mode). vo-(r) 3 negative(-) btl output of right channel. vo+(r) 4 positive(+) btl output of right channel. gnd 5 ground vo-(l) 6 negative(-) btl output of left channel. vo+(l) 7 positive(+) btl output of left channel. v dd 8 power supply of left and right channel. inl 9 input of left channel. bypass 10 bypass pin. ? ordering information ordering code speaker channels pin/ package output power (thd+n=10%) input type output type LY8209U stereo msop10 3.3w/4 ? @5.5v_btl 2.8w/4 ? @5.0v_btl 2.0w/8 ? @5.5v_btl 1.6w/8 ? @5.0v_btl se btl
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 3 ? ? typical application circuit figure 1. ly8209 typical application circuit ? absolute maximum ratings parameter symbol rating unit supply voltage v dd 6.0 v operating temperature t a -40 to 85 (i grade) input voltage v i -0.3v to v dd +0.3v v storage temperature t stg -65 to 150 power dissipation p d internally limited w esd susceptibility v esd 2000 v junction temperature t jmax 150 soldering temperature (under 10 sec) t solder 260
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 4 ? ? electrical characteristics (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit power supply voltage v dd - 2.5 - 5.5 v v dd = 5.0v, r l =4 ? - 6.5 - v dd = 3.7v, r l =4 ? - 5.5 - quiescent current i q v dd = 2.5v, r l =4 ? - 5.0 - ma shutdown current i sd v shutdown Q 0.8v, - 0.1 - a shutdown voltage input high v sdih 1.5 - - shutdown voltage input low v sdil v dd = 5.0v - - 0.3 v output offset voltage v os v dd = 5.0v , v i =0v, av=11v/v - - 95 mv shutdown temp. - 150 - thermal shutdown temperature t sd restore temp. - 110 - total gain *1 gv v dd = 2.5v to 5.5v [150k ? / (5k ? +ri)] x4 v/v (*1)the audio amplifier?s gain is determined by pre-amplifier gain = [150k ? / ( 5k ? + ri )] x 2 total gain = { [150k ? / ( 5k ? + ri )] x 2 } x 2 where ri is the external serial resistance at the input pin. (*2)typical values are included for reference only and are not guaranteed or tested. typical values are measured at v dd = v dd (typ.) and t a = 25 ? operating characteristics (1) (stereo mode) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit f=1khz - -58 - power supply rejection ratio psrr av=11 v/v ,input=gnd ri=51k, ci=0.1 f r l =4ohm, v dd =5.0v f=217hz - -59 - db l ? r - -77 - crosstalk (stereo mode) cs 0.25w=0db, f=1khz, r l = 4 ? , v dd =5.0v r ? l - -80 - db signal-to-noise ratio snr av=11 v/v, r l = 8 ? , input pin floating, 1w=0db v dd =5.0v - 84 - db output voltage noise vn av=11 v/v, r l = 8 ? , input pin floating, f = 20 hz to 20 khz, v dd =5.0v - 130 - uv rms frequency fc v dd =2.5v~5.5v - 220 - khz efficiency v dd =5.0v,f=1khz, rl=8 ? , output=1.8w - 89 - % (*2)typical values are included for reference only and are not guaranteed or tested. typical values are measured at v dd = v dd (typ.) and t a = 25
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 5 ? ? operating characteristics (2) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit v dd =5.5v - 3.3 - v dd =5.0v - 2.8 - v dd =3.7v - 1.5 - thd+n= 10%, f = 1 kh z r l = 4 ? v dd =2.5v - 0.6 - v dd =5.5v - 2.7 - v dd =5.0v - 2.2 - v dd =3.7v - 1.2 - thd+n= 1%, f = 1 khz, r l = 4 ? v dd =2.5v - 0.5 - v dd =5.5v - 2.0 - v dd =5.0v - 1.6 - v dd =3.7v - 0.9 - thd+n= 10%, f = 1 kh z r l = 8 ? v dd =2.5v - 0.4 - v dd =5.5v - 1.6 - v dd =5.0v - 1.3 - v dd =3.7v - 0.7 - output power p o thd+n= 1%, f = 1 khz, r l = 8 ? v dd =2.5v - 0.3 - w (*2)typical values are included for reference only and are not guaranteed or tested. typical values are measured at v dd = v dd (typ.) and t a = 25 ? typical performace characteristics figure 2. total harmonic distortion + noise vs output power (r l = 4 ? , stereo mode)
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 6 ? figure 3. total harmonic distortion + noise vs output power (r l = 8 ? , stereo mode) figure 4. snr vs. noise level
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 7 ? figure 5. crosstalk figure 6 fcc class-b (vertical)
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 8 ? figure 7 fcc class-b (horizontal) figure 8 cispr class-b (vertical)
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 9 ? figure 9 cispr class-b ( horizontal) sd current vs. sd voltage quiescent current vs. supply voltage shutdown current vs shutdown voltage 0 2 4 6 8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 shutdown voltage - v i(sd) shutdown current - ua 2.5v 3.7v 5v quiescent current vs supply voltage 2 3 4 5 6 7 8 9 10 2.5 3 3.7 4.2 5 5.5 6 vdd - supply voltage - v i(q) - quiescent current - ma no load 4 ? , 2ch 8 ? , 2ch
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 10 ? supply current vs. output power (rl=4 ? ) supply current vs. output power (rl=8 ? ) supply current vs output power 0 200 400 600 800 1000 1200 1400 0 0.2 0.4 0.8 1.2 1.6 2 2.4 po-output power-w rl=4 ? supply current-ma 2.5v(d) 3.7v(d) 5v(d) supply current vs output power 0 100 200 300 400 500 600 700 800 900 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 po - output power - w rl=8 ? supply current - ma 2.5v(d) 3.7v(d) 5v(d) load resistance vs. output power (thd+n=10%) load resistance vs. output power (thd+n=1%) output power vs load resistance 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po-output power 2.5v 3.7v 5v 6v 4.2v 5.5v output power vs load resistance 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po-output power 2.5v 3.7v 5v 6v 4.2v 5.5v output power vs. vdd (rl=8ohm) output power vs. vdd (rl=4ohm) output power vs. supply voltage(8 ? ) 0 0.4 0.8 1.2 1.6 2 2.4 2.8 2.5v 3.7v 4.2v 5v 5.5v 6v vdd-supply voltage-v (rl=8ohm, f=1khz, av=11 v/v) po-output power thd+n=10% thd+n=1% output power vs. supply voltage(4 ? ) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 2.5v 3.7v 4.2v 5v 5.5v 6v vdd-supply voltage-v (rl=4ohm, f=1khz, av=11 v/v) po-output power thd+n=10% thd+n=1%
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 11 ? efficiency vs. output power (8ohm) 3.7v efficiency vs. output power (8ohm) 5.0v efficiency vs output power(w) (rl=8 ? speaker+33uh),vdd=3.7v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 po-output power(w) efficiency(%) efficiency vs output power(w) (rl=8 ? speaker+33uh),vdd=5v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 po-output power(w) efficiency(%) efficiency vs. output power (4ohm) 3.7v efficiency vs. output power (4ohm) 5.0v efficiency vs output power(w) (rl=4 ? speaker+ 33uh),vdd=3.7v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.5 1.6 po-output power(w) efficiency(%) efficiency vs output power(w) rl=4 ? speaker+33uh,vdd=5v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.4 0.8 1 1.2 1.6 2 2.4 2.8 po-output power(w) efficiency(%) dissipation vs. output power (8ohm) dissipation vs. output power (4ohm) power dissipation vs output power 0 0.05 0.1 0.15 0.2 0.25 0.3 0 0.20 0.39 0.58 0.76 0.95 1.13 1.30 1.46 1.62 1.78 po - output power - w (rl=8 ? speaker+33uh) pd - power dissipation - w (5v)pd (3.7v)pd power dissipation vs output power 0 0.2 0.4 0.6 0.8 1 1.2 0 0.19 0.37 0.74 1.10 1.46 1.81 2.16 2.47 2.66 2.82 3.53 4.19 4.86 po - output power - w rl=4 ? speaker+ 33uh pd - power dissipation - w (5v)pd (3.7v)pd
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 12 ? ? application information input resistors (ri) and gain the ly8209 have two internal amplifier stages. the pre-am plifier gain is externally configurable, while the total gain is internally fixed. the closed-loop gain of the pre-amplifier gain is set by selecting the rf (rf=150k ? ) to ri while the total gain is fixed at 4x. so the input resistors (r i ) set the gain of the amplifier according to the equation. pre-amplifier gain = (rf / ri) x 2 total gain = [(rf / ri ) x 2] x 2 a vd = 20 x log [4 x (rf /ri )] the resistor matching is very important in the amp lifiers. balance of the output on the reference voltage depends on matched ratio of the resistors. cmrr, psrr, and cancellation of the second harmonic distortion if resistor mismatch occurs. therefore, it is recomm ended 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 ly8209 to limit noise injection on the high -impedance nodes. for optimal performance the gain should be set to 4 v/v or lower. lower gain allows the ly8209 to operate at its best, for example table 1. typical total gain and a vd values rf (k ? ) 150 150 150 150 150 ri (k ? ) 150 75 50 25 15 pre amp. gain 2 4 6 12 20 total gain 4 8 12 24 40 a vd (db) 12.04 18.06 21.58 27.60 32.04 input capacitors (ci) the ly8209 using fully differential source, so the input coupling capacitors are requi red. the input capacitors and input resistors form a high-pass filter with the corner frequency(f c ), determined in the equation. fc = 1 / ( 2 ri ci ) the value of the input capacitor is important to cons ider as it directly affects the bass (low frequency) performance of the circuit. speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. equation is reconfigured to solve for the input coupling capacitance. ci = 1 / ( 2 ri fc ) if the corner frequency is within the audio band, the capacitors should have a tolerance of 10% or better, because any mismatch in capacitance causes an im pedance mismatch at the corner frequency and below.
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 13 ? for example in the table 2 shows the external components. rin in connect with cin to create a high-pass filter. table 2. reference component values reference description note ri 150k ? 51 k ? 1% tolerance resistors ci 0.22uf 0.1uf 0.22uf 0.1uf 80%/?20% non polarized corner frequency 4.8h z 10.6hz 14.18hz 31.2hz ci = 1 / ( 2 ri fc) ci = 1 / ( 2 x 150k ? x 4.8hz)=0.221uf one would likely choose a value of 0.22uf as this value is commonly used. bypass capacitor (c bypass ) the bypass capacitor (c3 ) is the most critical capacito r. during start-up or reco very from shutdown mode, cbypass determines the rate at which the amplifier starts up. the cbypass will to reduce noise caused by the power supply coupling into the output drive signal. this noise is from the internal analog reference to the amplifier, which appears as degraded the psrr and thd+n values. the bypass capacitor (c3 ) with values of 1.0 f to 10.0 f is recommended for the best thd and noise performance. therefore, increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown. table 3. c bypass reference component values parameter symbol test condition min. typ. max. unit c bypass = 10.0 f - 560 - c bypass = 4.7 f - 300 - c bypass = 2.2 f - 150 - v dd = 5.0v, ci=0.1uf, ri=51k ? , av=11 c bypass = 1.0 f - 120 - c bypass = 10.0 f - 460 - c bypass = 4.7 f - 250 - c bypass = 2.2 f - 135 - start-up time from shutdown z i v dd =3.7 v, ci=0.1uf, ri=51k ? , av=11 c bypass = 1.0 f - 100 - ms shutdown function when the ly8209 not in use. the device will be to turn off the amplifier to reduce power consumption. when logic low is applied to the shutdown pin, this shutdo wn feature will turns the amp lifier off. by switching the shutdown pin connected to gnd, t he device supply current draw will be minimized in idle mode. the pin cannot be left floating due to the internal did not pull-up. over-heat protection the ly8209 has a built-in over-heat protection circuit, it will turn off all power output when the chip temperature over 150 , the chip will return to normal operation au tomatically after the temperature cool down to 110 .
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 14 ? short-circuit protection the ly8209 has short circuit protection circuitry on the outputs to prevent damage when output-to-output short occurs. when a short circuit is detected on the out puts, the outputs are disabled immediately. if the short was removed, the device activates again. ? pcb layout all the external components must place very close to the ly8209. the input resistors need to be very close to the ly8209 input pins so noise does not couple on th e high impedance nodes betwee n the input resistors and the input amplifier of the ly8209. then place the deco upling capacitor cs, close to the ly8209 is important for the efficiency of the class-d amplifier. any resist ance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. if device had avdd( analog vdd) pin, place the decoupling capacitor 0. 1uf, close to the device pin is very important. making the high current traces going to vdd, gnd, v o+ and v o- pins of the ly8209 should be as wide as possible to minimize trace resistance. if these trac es are too thin, the ly8209's performance and output power will decrease. the input traces do not need to be wide, but do need to run side-by-side to enable common-mode noise cancellation.
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 15 ? ? demo board information demo board application circuit : (stereo mode) figure 10. demo board application circuit demo board bom list : ly8209 v1.0 bom list (stereo mode) no. description reference note 1 resistor, 47k ? r1,r2 1/16w,1% 2 resistor, 100k ? r9 1/16w,1% 3 capacitor, 0.1uf c1,c2,c4 80%/ ? 20%, non polarized 4 capacitor, 4.7uf c3 80%/ ? 20%, non polarized 5 capacitor, 220.0uf c6 25 v,105 ,8x11,ec cap. 6 ic u2 LY8209U, (msop10) 7 1*2 pin header j2,j6 pitch 2.54 mm 8 capacitor, 330pf(option) c12,c13,c15,c16 80%/ ? 20%, nonpolarized 9 capacitor, 390pf(option) c11,c14 80%/ ? 20%, nonpolarized 10 chip bead 1k ? /100mhz(option) l1,l2,l3,l4,l5,l6 1000 ? (1k ? )25%/100mhz
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 16 ? demo board artwork : top silkscreen top layer composite view bottom layer
ly8209 rev. 1.2 3.3w/ch stereo class d audio power amplifier lyontek inc. reserves the rights to change the specifications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 17 ? ? package outline dimension msop 10 pin package outline dimension

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