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ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? 2.5v~5.5v power supply. ? thermal shutdown protection. ? low current shutdown mode. ? no capacitors and networks or bootstrap capacitors required. ? low noise during turn-on and turn-off transitions. ? user selectable stereo headphone function. ? lead free and green package available. (rohs compliant) ? space saving package -- 16-pin qfn (3*3*0.75 mm) package application ? portable electronic devices ? portable and desktop computers ? cell phones ? multimedia monitors ? audio system general description the ly8662 is a dual bridge-connected audio power amplifier. it is capable of driving 4 speaker load at a continuous average output of 2.0w / 10% distortion (thd+n) from a 5.5v power supply. it primarily designed for high quality application in other portable communication device and portable and desktop computers device. the audio amplifier features low power consumption in shutdown mode. and it has an internal thermal shutdown protection feature. ly8662 audio amplifier was designed specifically to provide high quality output power with a minimal amount of external components. the ly8662 does not require output capacitors, and it is ideally suited for other low voltage applications or portable electronic devices where minimal power consumption is a primary requirement. pin configuration
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 qfn description +outa 1 positive btl output of a channel. v dd 2/11 power supply. -outa 3 negative btl output of a channel. ina 4 input of a channel. gnd 5/6/7/13/16 ground. bypass 8 bypass capacitor which prov ides the common mode voltage. inb 9 input of b channel. -outb 10 negative btl output of b channel. +outb 12 positive btl output of b channel. hp sense (option) 14 headphone sense pin option. (if none headphone function must connect to gnd). shutdown 15 shutdown the device pin.( when low level is active the pin)
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? application circuit figure 1. without headphone typi cal application circuit (qfn16)
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? figure 2. with headphone typical application circuit (qfn16)
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? ordering information ly 8 662 vv absolute maximun 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 vapor phase (60 sec.) 215 soldering information infrared (15 sec.) 220 v : package type el : 16-pin qfn 3*3 product name a : product line ly : lyontek product number prefix
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? dc electrical characteristics (v dd =5.0v, t a =25 ) parameter symbol test condition min. typ. max. unit power supply current i dd v i n = 0v,8 load (btl) - 12.0 21.5 ma shutdown current i sd v shutdow n = 0v, hp sense= gnd - 0.1 1.0 a shutdown, headphone sense high input voltage v sdih 1.4 - - v shutdown, headphone sense low input voltage v sdil - - 0.4 v wake-up time t wu bypass cap.=1.0uf - 172 - ms output offset voltage v os - 7.0 50.0 mv thd+n = 1%, f = 1 khz, r l =8 ? - 1.1 - thd+n = 10%, f = 1 khz r l =8 ? - 1.4 - thd+n = 1%, f = 1 khz r l =4 ? - 1.4 - thd+n = 10%, f = 1 khz r l =4 ? - 1.8 - thd+n = 10%, f = 1 khz r l =4 ? (at 5.5v) - 2.0 - w thd+n = 0.1%, f = 1 khz, r l =32 ? (se mode) - 90 - output power po thd+n = 0.1%, f = 1 khz, r l =16 ? (se mode) - 165 - mw total harmonic distortion+ noise thd+n po = 0.4 wrms; f = 1khz, r l =8 ? - 0.11 % power supply rejection ratio psrr vripple = 200mv sine p-p input terminated with 10 to gnd - 62 (f = 217hz) 66 (f = 1khz) - db f = 20 hz to 20 khz, a-weighting - 37.5 - output voltage noise vn f = 20 hz to 20 khz, a-weighting (se mode) - 15 - uv thermal shutdown temperature t sd 150 170 190 shut down time t sdt 8 ? load - 1.0 - ms
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? dc electrical characteristics (v dd =3.6v, t a =25 ) parameter symbol test condition min. typ. max. unit power supply current i dd v i n = 0v, i o = 0a, 8 load (btl) - 10.0 16.5 ma shutdown current i sd v shutdow n = 0v hp sense= gnd - 0.1 2.0 a shutdown, headphone sense high input voltage v sdih 1.4 - - v shutdown, headphone sense low input voltage v sdil - - 0.4 v wake-up time t wu bypass cap.=1.0uf - 82 - ms output offset voltage v os - 7.0 50 mv thd+n = 1%, f = 1 khz, r l =8 ? - 0.5 - thd+n = 10%, f = 1 khz r l =8 ? - 0.65 - thd+n = 1%, f = 1 khz r l =4 ? - 0.65 - thd+n = 10%, f = 1 khz r l =4 ? - 0.8 - w thd+n = 0.1%, f = 1 khz, r l =32 ? (se mode) - 45 - output power po thd+n = 0.1%, f = 1 khz, r l =16 ? (se mode) - 83 - mw total harmonic distortion+ noise thd+n po = 0.2 wrms; f = 1khz, r l =8 ? - 0.12 - % power supply rejection ratio psrr vripple = 200mv sine p-p input terminated with 10 to gnd - 56 (f = 217hz) 62 (f = 1khz) - db f = 20 hz to 20 khz, a-weighting - 37.5 - output voltage noise vn f = 20 hz to 20 khz, a-weighting (se mode) - 15 - uv thermal shutdown temperature t sd 150 170 190 shut down time t sdt 8 ? load - 1.0 - ms
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? ordering information ly 8 662 vv v : package type el : 16-pin qfn 3*3 product name a : product line ly : lyontek product number prefix
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? application information the ly8662?s qfn package provides a low thermal resistance between the die and the pcb to which the part is mounted and soldered. this allows rapid heat transf er from the die to the surrounding pcb copper traces, ground plane and, finally, surrounding air. the result is a low voltage audio power amplifier that produces 2.0w at 10% thd with a 4 ? load from a 5.5v power supply. this high power is achieved through careful consideration of necessary thermal design. failing to optimize thermal design may compromise the ly8662?s high power performance and activate unwanted, though necessary, thermal shutdown protection. power supply bypassing as with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. applications that em ploy a 5v regulator typically use a 10 f in parallel with a 0.1 f filter capacitor to stabilize the regulator?s output, reduce noise on the supply line, and improve the supply?s transient response. however, their presenc e does not eliminate the need for a local 1.0 f tantalum bypass capacitance connected between the ly8662?s supply pins and ground. do not substitute a ceramic capacitor for the tantalum. doing so may cause oscillation. keep t he length of leads and traces that connect capacitors between the ly8662?s power supply pin and ground as short as possible. micro-power shutdown the voltage applied to the shutdown pin controls t he ly8662?s shutdown function. activate micro-power shutdown by applying gnd to the shutdown pin. when active, the ly8662?s micro-power shutdown feature turns off the amplifier?s bias circui try, reducing the supply current. the low 0.1 a typical shutdown current is achieved by applying a voltage that is as near as gnd as possible to the shutdown pin. a voltage that is more than gnd may increase the shutdown current. table 1 shows the logic signal levels that activa te and deactivate micro-power shutdown and headphone amplifier operation. there are a few ways to control the micro-power shut down. these include using a single-pole, single-throw switch, a microprocessor, or a microcontroller. when using a switch, connect an external 20k resistor between the shutdown pin and ground. connect the sw itch between the shutdown pin vdd. select normal amplifier operation by closing the switch. o pening the switch sets the shutdown pin to ground through the 20k resistor, which activates the micro- power shutdown. the switch and resistor guarantee that the shutdown pin will not float. this prevents unwanted state changes. in a system with a microprocessor or a microcontroller, use a digital output to apply t he control voltage to the shutdown pin. driving the shutdown pin with active circuitry eliminates the pull up resistor. table 1. logic level truth table shutdown pin headphone jack sense pin operational output mode logic high low (hp not plugged in) btl logic high high (hp plugged in) single-ended logic low high or low don?t care micro-power shutdown headphone sense and headph one logic in functions applying a logic level to the ly8662?s hp sense hea dphone control pin turns off amp. a (+out) and amp. b (+out) muting a bridged-connected load. quiescent curre nt consumption is reduced when the ic is in this single-ended mode. figure 2 shows the implementati on of the ly8662?s headphone control function. with no headphones connected to the headphone jack, the r5-r6 voltage divider sets the voltage applied to the hp sense pin (pin 14) at approximately 50mv. this 50mv enables amp a (+out) and amp b (+out) placing the ly8662 in bridged mode operation. while the ly8662 operates in bridged mode, the dc potentia l across the load is essentially 0v. therefore, even in an ideal situation, the output swing ca nnot cause a false single-ended trigger. connecting headphones to the headphone jack disconnects the headphone jack contact pin from ? outa and allows r7 to pull the hp sense pin up to vdd.
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? this enables the headphone function, turns off amp a (+out) and amp b (+out) which mutes the bridged speaker. the amplifier then drives the headphones, whose impedance is in parallel with resistors r5 and r6. these resistors have negligible effect on the ly8662?s output drive capability since the typical impedance of headphones is 32 ? . figure 3 also shows the suggested headphone jack electrical connections. the jack is designed to mate with a four wire (or three wire)plug. the plug?s tip and ring should each carry one of the two stereo output signals, whereas the sleeve should carry the ground return. the headphone jack with one control pin contact is sufficient to drive the hp sense pin when connecting headphones. as outlined above driving the speaker (btl) and he adphone (se) loads simultaneously using ly8662 is simple and easy. however this configuration will only wo rk if the hp logic pin is used to control the btl/se operation and hp sense pin is connected to gnd(figure 4). figure 3. with headphone circuit (qfn type) figure 4. without headphone circuit (qfn type)
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? bypass capacitor value selection besides minimizing the input capacitor size, careful cons ideration should be paid to value of c4, the capacitor connected to the bypass pin. since c4 determines how fast the ly8662 settles to quiescent operation, its value is critical when minimizing turn-on pops. the sl ower the ly8662?s outputs ramp to their quiescent dc voltage (nominally 1/2 vdd), the smaller the turn-on pop. choosing c4 equal to 1.0 f along with a small value of c2,c3 (in the range of 0.1 f to 0.39 f), produces a click-less and p op-less shutdown function. as discussed above, choosing c1 no larger than necess ary for the desired bandwith helps minimize clicks and pops. connecting a 1 f capacitor, c4, between the bypass pin and gr ound improves th e internal bias voltage?s stability and improves the amplifier?s psrr. optimizing click and pop reduction performance the ly8662 contains circuitry that minimizes turn-on and shutdown transients or ?clicks and pop?. for this discussion, turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. when the part is tur ned on, an internal current source change s the voltage of the bypass pin in a controlled, linear manner. ideally, the input and ou tputs track the voltage appl ied to the bypass pin. the gain of the internal amplifiers remains unity until t he voltage on the bypass pin reaches 1/2 vdd. as soon as the voltage on the bypass pin is stable, the dev ice becomes fully operatio nal. although the bypass pin current cannot be modified, changing the size of c4 alters the device?s turn-on time and the magnitude of ?clicks and pops?. increasing the value of c4 reduces the magnitude of turn-on pops. however, this presents a tradeoff: as the size of c4 increases, the turn-on time increases. there is a lin ear relationship between the size of c4 and the turn-on time. here are some typical turn-on times for various values of c4: in order eliminate ?clicks and pops?, all capacitors mu st be discharged before turn-on. rapidly switching vdd on and off may not allow the capacitors to fully discharge, which may cause ?clicks and pops?. table 2. c 4 and t on truth table c 4 t on (typ.) at 5.0v 1.0uf 172 ms 0.47uf 76 ms 0.33uf 60 ms 0.22uf 50 ms 0.1uf 36 ms
ly8662 rev. 1.2 dual 2.0w/ch stereo audio ampl ifier include headphone function 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 ? package outline dimension 16-pin 3x3 qfn package outline dimension

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