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ly8898 rev. 1.0 3.2 watt 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 ? 3.2w into 3 ? from 5.0v power supply at thd+n = 10% (typ.). ? 2.7w into 4 ? from 5.0v power supply at thd+n = 10% (typ.). ? 1.7w into 8 ? from 5.0v power supply at thd+n = 10% (typ.) ? 2.0v~5.5v power supply. ? low shutdown current (typ.=0.05ua). ? low quiescent current (typ.=3.0ma). ? thermal shutdown protection with auto recovery feature. ? advanced power on/off pop reduction. ? lead free and green package available. (rohs compliant) ? space saving package -- 8-pin esop package. (with thermal pad) application ? boom box. ? education, toy. ? mid, ? portable electronic devices. ? mobile phones. general description the ly8898 is a 3.2w audio power amplifier. it is capable of driving 3 ? speaker load at a continuous average output of 3.2w with less than 10% distortion (thd+n) from a 5.0v power supply and 4 ? speaker load at a continuous average output of 2.7w with less than 10% distortion (thd+n) from a 5.0v power supply. the ly8898 primarily designed for high quality application in other portable communication device. and the ly8898 audio amplifier features low power consumption shutdown mode. it is achieved by driving the shutdown pin with logic high. and the ly8898 has an internal thermal shutdown protection feature. the ly8898 audio amplifier was designed specifically to provide high quality output power with a minimal amount of external components. the ly8898 does not require output capacitors, and the ly8898 is ideally suited for other low voltage applications or portable electronic devices where minimal power consumption is a primary requirement. pin configuration power on pop noise power off pop noise
ly8898 rev. 1.0 3.2 watt 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 esop8 description shutdown 1 shutdown the device. (when high level is shutdown mode) bypass 2 bypass pin +in 3 positive input -in 4 negative input vo1(-) 5 negative output v dd 6 power supply gnd 7 ground vo2(+) 8 positive output ordering information ordering code speaker channels pin/ package output power (thd+n=10%) input type output type ly8898v mono esop8 (with thermal pad) 3.2w/3 ? @5.0v_btl 2.7w/4 ? @5.0v_btl 1.7w/8 ? @5.0v_btl se/ df btl application circuit figure 1. ly8898 a pplication schematic with single ?ended input
ly8898 rev. 1.0 3.2 watt 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 ? figure 2. ly8898 a pplication schematic with differential input 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
ly8898 rev. 1.0 3.2 watt 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 ? dc electrical characteristics (ta=25 ) parameter symbol test condition min. typ. *2 max. unit power supply voltage v dd -- 2.0 - 5.5 v quiescent current i q v dd =5.0v, load=4 ? . - 3.0 9.0 ma shutdown current i sd v dd =5.0v, v sd =v dd - 0.05 2.0 a shutdown voltage input high v sdih v dd =5.0v, v sd mode = v dd 1.2 - - shutdown voltage input low v sdil v dd =5.0v, v sd mode = gnd - - 0.4 v output offset voltage v os v dd =5.0v, load=4 ? . - 7.0 50.0 mv (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and ta = 25 operating characteristics(1) (ta=25 ) parameter symbol test condition min. typ. *2 max. unit 1khz - 64.58 - v ripple = 200mv sine p-p, v dd =5.0v, r l =4 ? , av=2. input=gnd. 217hz - 58.80 - 1khz - 64.43 - power supply rejection ratio psrr v ripple = 200mv sine p-p, v dd =5.0v, r l =4 ? , av=2. input=floating. 217hz - 66.0 - db a-weight ing - 95.3 - signal-to-noise ratio snr v dd =5.0v,r l =4 ? , input=gnd, av=2, 1w=0db, none a-weight ing - 92.1 - db a-weight ing - 34.26 - output voltage noise vn v dd =5.0v,av=2, f=20hz~20khz, input=gnd, r l =4 ? spk, none a-weight ing - 50.13 - uv shutdown temp. - 160 - thermal shutdown temperature t sd restore temp. - 130 - (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and ta = 25
ly8898 rev. 1.0 3.2 watt 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) (ta=25 ) parameter symbol test condition min. typ. *2 max. unit vdd=5.5v - 3.8 - vdd=5.0v - 3.2 - vdd=3.7v - 1.7 - vdd=2.5v - 0.72 - r l =3 ? *3 thd=10%, f=1 khz vdd=2.0v - 0.42 - vdd=5.5v - 2.8 - vdd=5.0v - 2.3 - vdd=3.7v - 1.25 - vdd=2.5v - 0.5 - r l =3 ? *3 thd=1%, f=1 khz vdd=2.0v - 0.25 - vdd=5.5v - 3.3 - vdd=5.0v - 2.7 - vdd=3.7v - 1.5 - vdd=2.5v - 0.6 - r l =4 ? *3 thd=10%, f=1 khz vdd=2.0v - 0.37 - vdd=5.5v - 2.5 - vdd=5.0v - 2.0 - vdd=3.7v - 1.1 - vdd=2.5v - 0.5 - r l =4 ? *3 thd=1%, f=1 khz vdd=2.0v - 0.25 - vdd=5.5v - 2.0 - vdd=5.0v - 1.7 - vdd=3.7v - 1.0 - vdd=2.5v - 0.4 - r l =8 ? thd=10%, f=1 khz vdd=2.0v - 0.25 - vdd=5.5v - 1.6 - vdd=5.0v - 1.3 - vdd=3.7v - 0.7 - vdd=2.5v - 0.3 - output power po r l =8 ? thd=1%, f=1 khz vdd=2.0v - 0.2 - w (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and ta = 25 (*3) when driving 3 ? or 4 ? loads from 4.2v~5v power supply, the dev ice must be mounted to a circuit board.
ly8898 rev. 1.0 3.2 watt 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 ? typical performanc e characteristics figure 3 thd+n vs. output power (@ r l =3 ? , f=1khz, a v =10) figure 4 thd+n vs. output power (@ r l =4 ? , f=1khz, a v =10)
ly8898 rev. 1.0 3.2 watt 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 thd+n vs. output power (@ rl=8 ? , f=1khz, a v =10) figure 6 power supply rejection ratio (psrr)
ly8898 rev. 1.0 3.2 watt 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 frequency response vs. input capacitor values figure 8 snr vs. noise level
ly8898 rev. 1.0 3.2 watt 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 ? sd current vs. sd voltage quiescent current vs. supply voltage shutdown current vs shutdown voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 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 1 2 3 4 5 6 2 2.5 3 3.7 4.2 5 5.5 6 vdd - supply voltage(v) i(q) - quiescent current - ma no load 8 ? 4 ? 3 ? load resistance vs. output power (thd+n=10%) load resistance vs. output power (thd+n=1%) output power vs load resistance 0 0.5 1 1.5 2 2.5 3 3.5 4 3 ? 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po-out p ut p ower 2.5v 3.7v 5v 4.2v 5.5v output power vs load resistance 0 0.5 1 1.5 2 2.5 3 3 ? 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po-out p ut p ower 2.5v 3.7v 5v 4.2v 5.5v v dd current vs. output power (r l =3 ? ) v dd current vs. output power (r l =4 ? ) supply current vs. output power(rl=3 ? ) 0 100 200 300 400 500 600 700 800 900 1000 0 0.2 0.4 0.8 1 1.2 1.8 2.2 2.4 2.6 2.8 3 3.2 3.4 po-output power-w(rl=3 ? ) supply current-ma 2.0v 2.5v 3.7v 5.0v supply current vs. output power(rl=4 ? ) 0 100 200 300 400 500 600 700 800 900 0 0.2 0.4 0.8 1 1.2 1.8 2.2 2.4 2.6 2.8 3 3.2 po-output power-w(rl=4 ? ) supply current-ma 2.0v 2.5v 3.7v 5.0v
ly8898 rev. 1.0 3.2 watt 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 ? v dd current vs. output power (r l =8 ? ) v dd vs. output power (r l =3 ? ) supply current vs. output power(rl=4 ? ) 0 50 100 150 200 250 300 350 400 450 500 0 0.2 0.4 0.8 1 1.2 1.8 po-output power-w(rl=4 ? ) supply current-ma 2.0v 2.5v 3.7v 5.0v output power vs. supply voltage(3 ? ) 0 0.5 1 1.5 2 2.5 3 3.5 4 2.0v 2.5v 3.7v 4.2v 5v 5.5v vdd-supply voltage-v po-output power thd+n=10% thd+n=1% v dd vs. output power (r l =4 ? ) v dd vs. output power (r l =8 ? ) output power vs. supply voltage(4 ? ) 0 0.5 1 1.5 2 2.5 3 3.5 2.0v 2.5v 3.7v 4.2v 5v 5.5v vdd-supply voltage-v po-output power thd+ n= 10% thd+ n= 1% output power vs. supply voltage((8 ? ) 0 0.5 1 1.5 2 2.5 2.0v 2.5v 3.7v 4.2v 5v 5.5v vdd-supply voltage-v po-output power thd+n=10% thd+n=1%
ly8898 rev. 1.0 3.2 watt 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 ? output power vs. temperature
ly8898 rev. 1.0 3.2 watt 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 bridged configuration explanation as shown in figure 1 and 2, the ly8898 has two operational amplifiers internally, allowing for a few different amplifier configurations. the first amplifier?s gain is externally configurable, while the second amplifier is internally fixed in a unity-gain, inverting configuratio n. the closed-loop gain of the first amplifier is set by selecting the ratio of rf to rin while the second amplifier?s gain is fixed by the two internal 20k ? resistors. figure 1 and 2 shows that the output of amplifier one serves as the input to amplifier two which results in both amplifiers producing signals identical in magnitude, but out of phase by 180. consequently, the differential gain for the ic is a vd = 2 x ( r f / r in ) ????????????????????????(1) by driving the load differentially through outputs vo1( -) and vo2(+), an amplifier configuration commonly referred to as ?bridged mode? is established. bridg ed mode operation is different from the classical single-ended amplifier configuration where one side of the load is connected to ground. a bridge amplifier design has a few distinct advantages ov er the single-ended configur ation, as it provides differential drive to the load, thus doubling output swin g for a specified supply voltage. four times the output power is possible as compared to a single-ended amplifier under the same conditions. this increase in attainable output power assumes that the amplifier is not current limited or clipped. in order to choose an amplifier?s closed-loop gain without causing ex cessive clipping, please refer to the audio power amplifier design section. a bridge configuration, such as the one used in the ly8898, also creates a second advantage over single -ended amplifiers. since the differential outputs, vo1( -) and vo2(+), are biased at half-supply, no net dc voltage exists across the load. this eliminates the need for an output coupling capacitor which is required in a single supply, single-ended amplifier configuration. wi thout an output coupling capacitor, the half-supply bias across the load would result in both increased intern al ic power dissipation and also possible loudspeaker damage. input capacitors (ci) the ly8898 input capacitors and input resistors form a high-pass filter with the corner frequency, f c , determined in equation equation 2. 1 fc = -------- --------????????????????????????(2) 2 rici equation 3 is reconfigured to solve for the input coupling capacitance. 1 ci = ---------- -------???????????????????????.(3) 2 rifc for example in the table 1 shows the external components. rin in connect with cin to create a high-pass filter.
ly8898 rev. 1.0 3.2 watt 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 ? table 1. typical component values reference description note ri 20k ? 1% tolerance resistors ci 0.1uf 0.22uf 0.33uf 0.47uf 80%/?20% non polarized corner frequency 79.57hz 36.17hz 20.4hz 16.93hz ci = 1 / ( 2 rifc) ci = 1 / ( 2 x20k ? x20hz)=0.1uf one would likely choose a value of 0.1uf as this value is commonly used. note that it is important to c i must be 10 times smaller than the bypass capacitor to reduce clicking and popping noise from power on/off and entering and leaving shutdown. after sizing c i for a given cutoff frequency, size the bypass capacitor to 10 times that of the input capacitor. ci Q cbypass / 10 bypass capacitor value selection besides minimizing the input capacitor size, careful cons ideration should be paid to value of cbypass, the capacitor connected to the bypass pin. since cbypass det ermines how fast the ly889 8 settles to quiescent operation, its value is critical when minimizing turn-o n pops. the slower the ly8898?s outputs ramp to their quiescent dc voltage (nominally 1/2 vdd), the smaller the turn-on pop. choosing cbypass value equal 1.0 to 10 uf along with a small value of ci (in the range of 1 nf to 0.39 f), produces a click-less and pop-less shutdown function. as discussed above, choosing ci no larger than necessary for the desired bandwith helps minimize clicks and pops. therefore, increasing t he bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown. to have minimal pop, cbypass should be 10 times larger than c i . cbypass R ci x 10 table 2. cbypass reference component values parameter symbol test condition min. typ. max. unit c bypass = 10 f - 940 - c bypass = 4.7 f - 550 - c bypass = 2.2 f - 190 - v dd = 5.0v, ci=0.1uf, ri=20k ? , av=10 c bypass = 1.0 f - 158 - c bypass = 10 f - 780 - c bypass = 4.7 f - 480 - c bypass = 2.2 f - 180 - start-up time from shutdown z i v dd =3.7 v, ci=0.1uf, ri=20k ? , av=10 c bypass = 1.0 f - 126 - ms power supply bypassing capacitor as with any amplifier, proper supply bypassing is cr itical for low noise performance and high power supply rejection. the capacitor location on both the bypass and power supply pins should be as close to the device as possible. the ly8898 is a mono class ab audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (t hd) is low. for higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resi stance ceramic capacitor or electrolytic capacitors, typically 10~220uf, placed as close as possible to the device vdd lead works be st. placing 0.1uf decoupling capacitor close to the ly8898 is very important for th e efficiency of the class ab amplifier, because any
ly8898 rev. 1.0 3.2 watt 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 ? resistance or inductance in the trace between the devic e and the capacitor can cause a loss in efficiency and protect device damage. for filtering lower-frequency noi se signals, a 10.0uf or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high psrr of this device. shutdown function when the ly8898 not in use. the device will be to turn off the amplifier to reduce power consumption. when logic high is applied to the shutdown pin, this shutdo wn feature will turns the amp lifier off. by switching the shutdown pin connected to vdd, 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 ly8898 has a built-in over-heat pr otection circuit , it will turn off all power output when the chip temperature over 160 , the chip will return to normal operation au tomatically after the temperature cool down to 130 . pcb layout all the external components must place very close to t he ly8898. the input resistors need to be very close to the ly8898 input pins so noise does not couple on the high impedance nodes between the input resistors and the input amplifier of the ly8898. then place the decoup ling capacitor cs, close to the ly8898 is important for the efficiency of the class ab amplifier. any resist ance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. making the high current traces going to vdd, gnd, vo+ and vo- pins of the ly8898 should be as wide as possible to minimize trace resistance. if these traces are too thin, the ly8898'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.
ly8898 rev. 1.0 3.2 watt 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 : figure 9. ly8898 demo board application circuit demo board bom list : ly8898 v2.0 bom list (stereo mode) no. description reference note 1 resistor, 20k ? r1, r4b (r2,r3 df input only) 1/16w,1% 2 resistor, 100k ? r5 1/16w,1% 3 capacitor, 0.1uf c1, c4 (c2 df input only) 80%/ ? 20%, non polarized 4 capacitor, 1.0uf c3 80%/ ? 20%, non polarized 5 capacitor, 10.0uf c5 25 v,105 ,8x11,ec cap. 6 ic u1 ly8898 (esop8) 7 1*2 pin header j1 pitch 2.54 mm
ly8898 rev. 1.0 3.2 watt 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 (*3) when driving 3 ? or 4 ? loads from 4.2v~5v power supply, the dev ice must be mounted to a circuit board.
ly8898 rev. 1.0 3.2 watt 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 8 pin esop package outline dimension

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