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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. MAX98302 stereo 2.4w class d amplifier general description the MAX98302 stereo 2.4w class d amplifier provides class ab audio performance with class d efficiency. this device offers five selectable gain settings (6db, 9db, 12db, 15db, and 18db) set by a single gain-select input (gain). active emissions limiting, edge-rate, and overshoot con - trol circuitry greatly reduces emi. a filterless spread- spectrum modulation scheme eliminates the need for output filtering found in traditional class d devices. these features reduce application component count. the MAX98302 industry-leading 1.65ma at 3.7v, 2.25ma at 5v, quiescent current extends battery life in portable applications. the MAX98302 is available in a 14-pin tdfn-ep (3mm x 3mm x 0.75mm) package specified over the extended -40n c to +85n c temperature range. applications features s industry-leading quiescent current: 1.65ma at 3.7v, 2.25ma at 5v s spread spectrum and active emissions limiting s five selectable gains s high -67db psrr at 217hz s click-and-pop suppression s thermal and overcurrent protection s low-current shutdown mode s space-saving, 3mm x 3mm x 0.75mm, 14-pin tdfn-ep package 19-5169; rev 0; 4/10 + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering information typical application circuit notebook and netbook computers cellular phones mp3 players portable audio players voip phones evaluation kit available inl+ outl+ outl- outr- outr+ inl- inr- inr+ gain gain control 1f 1f 1f 1f pvdd pvdd pgnd shdn MAX98302 0.1f 10f +2.6v to +5.5v pvdd part temp range pin-package MAX98302etd+ -40nc to +85nc 14 tdfn-ep*
2 ______________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. pvdd to pgnd .......................................................... -0.3v to 6v all other pins to pgnd .......................... -0.3v to (pvdd + 0.3v) continuous current into pvdd, pgnd, outl_, outr_ .......................................................... q600ma continuous input current (all other pins) ........................ q20ma duration of short circuit between outl_, outr_ to pvdd or pgnd ..................................... continuous duration of short circuit between outl+ to outl-, outr+ to outr- .................................................. continuous continuous power dissipation for single layer board (t a = +70 n c) 14-pin tdfn (derate 18.5mw/ n c above +70nc) .... 1481.5mw 14-pin tdfn b ja (note 1) ............................................ 54nc/w 14-pin tdfn b jc (note 1) .............................................. 8nc/w continuous power dissipation for multilayer board (t a = +70 nc) 14-pin tdfn (derate 24.4mw/ n c above +70nc) .... 1951.2mw 14-pin tdfn b ja (note 1) ............................................ 41nc/w 14-pin tdfn b jc (note 1) .............................................. 8nc/w junction temperature ..................................................... +150nc operating temperature range .......................... -40n c to +85nc storage temperature range ............................ -65n c to +150nc lead temperature (soldering, 10s) ................................ +300nc soldering temperature (reflow) ...................................... +260nc electrical characteristics (v pvdd = v shdn = 5.0v, v pgnd = 0v, av = 12db (gain = pvdd), r l = j, r l connected between out_+ to out_-, 20hz to 22khz ac measurement bandwidth, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 n c.) (notes 2, 3) absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. parameter symbol conditions min typ max units amplifier characteristics supply voltage range v pvdd inferred from psrr test 2.6 5.5 v undervoltage lockout uvlo 2.5 v quiescent supply current i dd v pvdd = 5.0v, t a = +25nc 2.25 3.4 ma v pvdd = 3.7v 1.65 shutdown supply current i shdn v shdn = 0v, t a = +25nc 0.1 10 fa turn-on time t on 3.7 10 ms bias voltage v bias 1.3 v voltage gain a v connect gain to pgnd 17.5 18 18.5 db connect gain to pgnd through 100ki 5% resistor 14.5 15 15.5 connect gain to pvdd 11.5 12 12.5 connect gain to pvdd through 100ki 5% resistor 8.5 9 9.5 gain unconnected 5.5 6 6.5 input resistance r in a v = 18db 14 20 ki a v = 15db 14 20 a v = 12db 14 20 a v = 9db 19 28 a v = 6db 26 40 output offset voltage v os t a = +25nc (note 4) 4 20 mv
_______________________________________________________________________________________ 3 MAX98302 stereo 2.4w class d amplifier electrical characteristics (continued) (v pvdd = v shdn = 5.0v, v pgnd = 0v, av = 12db (gain = pvdd), r l = j, r l connected between out_+ to out_-, 20hz to 22khz ac measurement bandwidth, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 n c.) (notes 2, 3) note 2: all devices are 100% production tested at t a = +25 n c. all temperature limits are guaranteed by design. note 3: testing performed with a resistive load in series with an inductor to simulate an actual speaker load. for r l = 4 i, l = 33 f h. for r l = 8 i , l = 68fh. note 4: amplifier inputs ac-coupled to ground. note 5: mode transitions controlled by shdn. parameter symbol conditions min typ max units click and pop k cp peak voltage, a-weighted, 32/samples per second, r l = 8i + 68fh (notes 4, 5) into shutdown -54 dbv out of shutdown -54 common-mode rejection ratio cmrr f in = 1khz, input referred 62 db crosstalk p out = 300mw, r l = 8i + 68fh f = 1khz 92 db f = 10khz 80 power-supply rejection ratio (note 4) psrr v pvdd = 2.6v to 5.5v, t a = +25nc 50 67 db v ripple = 200mv p-p , r l = 8i + 68fh f = 217hz 67 f = 1khz 65 f = 10khz 58 output power p out thd+n = 10%, f in = 1khz r l = 4i + 33fh 2.4 w r l = 8i + 68fh 1.6 r l = 8i + 68fh, v pvdd = 3.7v 0.87 thd+n = 1%, f in = 1khz r l = 4i + 33fh 2 w r l = 8i +68fh 1.25 r l = 8i + 68fh, v pvdd = 3.7v 0.68 total harmonic distortion plus noise thd+n f in = 1khz r l = 4i + 33fh, v pvdd = 1w 0.04 % r l = 8i + 68fh p out = 0.5w 0.04 oscillator frequency f osc 300 khz spread-spectrum bandwidth 7 khz efficiency e thd+n = 1%, f = 1khz, r l = 8i + 68fh 83 % output noise v n a v = 6db, a weighted (note 4) 50 fv rms output current limit i lim 2 a thermal shutdown level 160 nc thermal shutdown hysteresis 30 nc digital input (shdn gain) input voltage high v inh 1.4 v input voltage low v inl 0.4 v input leakage current t a = +25nc 1 fa
4 ______________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier typical operating characteristics (v pvdd = v shdn = 5.0v, v pgnd = 0v, a v = 12db, r l = j , unless otherwise specified, r l connected between out_+ to out_-, 20hz to 22khz ac measurement bandwidth, t a = +25nc, unless otherwise noted.) thd+n vs. frequency MAX98302 toc01 frequency (khz) thd+n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 r l = 4i + 33h v pvdd = 5.0v p out = 500mw p out = 400mw thd+n vs. frequency MAX98302 toc02 frequency (khz) thd+n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 r l = 4i + 33h v pvdd = 3.7v p out = 500mw p out = 400mw thd+n vs. frequency MAX98302 toc03 frequency (khz) thd+n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 r l = 8i + 68h v pvdd = 5.0v p out = 600mw p out = 800mw thd+n vs. frequency MAX98302 toc04 frequency (khz) thd+n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 r l = 8i + 68h v pvdd = 3.7v p out = 100mw p out = 350mw thd+n vs. output power MAX98302 toc05 output power (w) thd+n (%) 2.5 2.0 1.5 1.0 0.5 0.1 1 10 100 0.01 0 3.0 r l = 4i + 33h v pvdd = 5.0v f in = 6khz f in = 1khz f in = 100hz thd+n vs. output power MAX98302 toc06 output power (w) thd+n (%) 1.50 1.25 1.00 0.75 0.50 0.25 0.1 1 10 100 0.01 0 r l = 4i + 33h v pvdd = 3.7v f in = 6khz f in = 1khz f in = 100hz thd+n vs. output power MAX98302 toc07 output power (w) thd+n (%) 1.5 1.0 0.5 0.1 1 10 100 0.01 0 2.0 r l = 8i + 68h v pvdd = 5.0v f in = 6khz f in = 1khz f in = 100hz thd+n vs. output power MAX98302 toc08 output power (w) thd+n (%) 1.00 0.75 0.50 0.25 0.1 1 10 100 0.01 0 r l = 8i + 68h v pvdd = 3.7v f in = 6khz f in = 1khz f in = 100hz efficiency vs. output power MAX98302 toc09 output power per channel (w) efficiency (%) 2.00 1.50 0.50 1.00 10 20 30 40 50 60 70 80 90 100 0 0 2.50 v pvdd = 5.0v r l = 8i + 68h r l = 4i + 33h
_______________________________________________________________________________________ 5 MAX98302 stereo 2.4w class d amplifier typical operating characteristics (continued) (v pvdd = v shdn = 5.0v, v pgnd = 0v, a v = 12db, r l = j , unless otherwise specified, r l connected between out_+ to out_-, 20hz to 22khz ac measurement bandwidth, t a = +25nc, unless otherwise noted.) efficiency vs. output power MAX98302 toc10 output power (w) efficiency (%) 1.25 1.00 0.75 0.50 0.25 10 20 30 40 50 60 70 80 90 100 0 0 1.50 v pvdd = 3.7v r l = 8i + 68h r l = 4i + 33h output power vs. load resistance MAX98302 toc11 load resistance (i) output power per channel (w) 100 10 0.5 1.0 1.5 2.0 2.5 3.0 0 1 1000 v pvdd = 5v 10% thd+n 1% thd+n output power vs. load resistance MAX98302 toc12 load resistance (i) output power (w) 100 10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 1 1000 v pvdd = 3.7v 1% thd+n 10% thd+n output power vs. supply voltage MAX98302 toc13 supply voltage (v) output power (w) 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 2.5 5.5 r l = 4i + 68h 1% thd+n 10% thd+n output power vs. supply voltage MAX98302 toc14 supply voltage (v) output power (w) 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 0 2.5 5.5 r l = 8i + 68h 1% thd+n 10% thd+n power-supply rejection ratio vs. frequency MAX98302 toc15 frequency (khz) psrr (db) 10 1 0.1 -70 -60 -50 -40 -30 -20 -10 0 -80 0.01 100 v ripple = 200mv p-p v pvdd = 5.0v crosstalk vs. frequency MAX98302 toc16 frequency (khz) crosstalk (db) 10 1 0.1 -100 -80 -60 -40 -20 0 -120 0.01 100 input referred r l = 8 i + 68h p out = 300mw left to right right to left common-mode rejection ratio vs. frequency MAX98302 toc17 frequency (khz) cmrr (db) 10 1 0.1 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0.01 100 input referred r l = 8i + 68h p out = 300mw gain vs. frequency MAX98302 toc18 frequency (khz) amplitude (db) 10 1 0.1 2 4 6 8 10 12 14 16 18 20 22 24 0 0.01 100 a v = 18db a v = 15db a v = 9db a v = 12db a v = 6db
6 ______________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier typical operating characteristics (continued) (v pvdd = v shdn = 5.0v, v pgnd = 0v, a v = 12db, r l = j , unless otherwise specified, r l connected between out_+ to out_-, 20hz to 22khz ac measurement bandwidth, t a = +25nc, unless otherwise noted.) MAX98302 toc19 MAX98302 output shdn 1ms/div exiting shutdown MAX98302 toc20 MAX98302 output shdn 1ms/div entering shutdown 10 1 0.1 0.01 0.001 100 wideband output spectrum MAX98302 toc21 frequency (mhz) output magnitude (dbv) -80 -60 -40 -20 0 -100 rbw = 100hz r l = 8i + 68h shutdown supply current vs. supply voltage MAX98302 toc24 supply voltage (v) supply current ( a) 5.0 4.5 4.0 3.5 3.0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 2.5 5.5 r l = inband output spectrum MAX98302 toc22 frequency (hz) output magnitude (dbv) 10,000 1000 100 -120 -100 -80 -60 -40 -20 0 -140 10 100,000 f = 1khz r l = 8i + 68h supply current vs. supply voltage MAX98302 toc23 supply voltage (v) supply current (ma) 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0 2.5 5.5 r l =
_______________________________________________________________________________________ 7 MAX98302 stereo 2.4w class d amplifier pin description pin configuration pin name function 1, 8, 14 pgnd ground 2 inl+ noninverting audio left input 3 inl- inverting audio left input 4 gain gain selection. see table 1 for gain settings. 5 inr- inverting audio right input 6 inr+ noninverting audio right input 7 shdn active-low shutdown input. drive shdn low to place the device in shutdown. 9 outr+ positive right speaker output 10 outr- negative right speaker output 11 pvdd power supply. bypass pvdd to pgnd with a 0.1ff capacitor. 12 outl- negative left speaker output 13 outl+ positive left speaker outpout ep exposed pad. connect ep to a solid ground plane. MAX98302 tdfn top view 2 *connect the ep to pgnd to enhance thermal dissipation. 4 5 13 11 10 outl+ pvdd outr- inl+ gain inr- 1 ep* 14 pgnd pgnd 3 12 outl- inl- 6 9 outr+ inr+ 7 8 pgnd shdn +
8 ______________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier detailed description the MAX98302 features industry-leading quiescent cur - rent, low-power shutdown mode, comprehensive click- and-pop suppression, and excellent rf immunity. the MAX98302 offers class ab audio performance with class d efficiency in a minimal board-space solution. the class d amplifier features spread-spectrum modu - lation, edge-rate, and overshoot control circuitry that offers significant improvements to switch-mode amplifier radiated emissions. the MAX98302 amplifier features click-and-pop sup - pression that reduces audible transients on startup and shutdown. the amplifier includes thermal-overload and short-circuit protection. class d speaker amplifier the MAX98302 filterless class d amplifier offers much higher efficiency than class ab amplifiers. the high efficiency of a class d amplifier is due to the switching operation of the output stage transistors. any power loss associated with the class d output stage is mostly due to the i 2 r loss of the mosfet on-resistance and quies - cent current overhead. ultra-low-emi filterless output stage traditional class d amplifiers require the use of external lc filters, or shielding, to meet en55022b electromagnet - ic-interference (emi) regulation standards. maxims active emissions limiting edge-rate control circuitry and spread- spectrum modulation reduce emi emissions, while main - taining up to 83% efficiency. maxims spread-spectrum modulation mode flattens wideband spectral components, while proprietary tech - niques ensure that the cycle-to-cycle variation of the switching period does not degrade audio reproduc - tion or efficiency. the MAX98302s spread-spectrum modulator randomly varies the switching frequency by q 7khz around the center frequency (300khz). above 10mhz, the wideband spectrum looks like noise for emi purposes. speaker current limit if the output current of the speaker amplifier exceeds the current limit (2a typ), the MAX98302 disables the out - puts for approximately 100 f s. at the end of 100f s, the outputs are re-enabled. if the fault condition still exists, the MAX98302 continues to disable and re-enable the outputs until the fault condition is removed. selectable gain the MAX98302 offers five programmable gains selected using the gain input. shutdown the MAX98302 features a low-power shutdown mode, drawing 0.17 f a of supply current. drive shdn low to put the MAX98302 into shutdown. click-and-pop suppression the MAX98302 speaker amplifier features maxims com - prehensive click-and-pop suppression. during startup, the click-and-pop suppression circuitry reduces any audible transient sources internal to the device. when entering shutdown, the differential speaker outputs ramp down to pgnd quickly and simultaneously. applications information filterless class d operation traditional class d amplifiers require an output filter. the filter adds cost and size and decreases thd+n perfor - mance. the MAX98302s filterless modulation scheme does not require an output filter. because the switching frequency of the MAX98302 is well beyond the bandwidth of most speakers, voice coil movement due to the switching frequency is very small. use a speaker with a series inductance > 10 f h. typical 8i speakers exhibit series inductances in the 20f h to 100f h range. component selection speaker amplifier power-supply input (pvdd) pvdd powers the speaker amplifier. pvdd ranges from 2.6v to 5.5v. bypass pvdd with 0.1 f f and 10f f capaci- tors to pgnd. also, connect at least 10 f f of system bulk capacitance to pvdd. apply additional bulk capaci - tance at the device if long input traces between pvdd and the power source are used. table 1. gain control configuration gain pin maximum gain (db) connect to pgnd 18 connect to pgnd through 100ki 5% resistor 15 connect to pvdd 12 connect to pvdd through 100ki 5% resistor 9 unconnected 6
_______________________________________________________________________________________ 9 MAX98302 stereo 2.4w class d amplifier input filtering the input-coupling capacitor (c in ), in conjunction with the amplifiers internal input resistance (r in ), forms a highpass filter that removes the dc bias from the incom - ing signal. these capacitors allow the amplifier to bias the signal to an optimum dc level. assuming zero-source impedance with a gain setting of a v = 12db, 15db, or 18db, c in is: in 3db 8 c [ f] f ? = with a gain setting of a v = 9db, c in is: in 3db 5.7 c [ f] f ? = with a gain setting of a v = 6db, c in is: in 3db 4 c [ f] f ? = where f -3db is the -3db corner frequency. use capaci - tors with adequately low-voltage coefficients for best low-frequency thd performance. layout and grounding proper layout and grounding are essential for optimum performance. good grounding improves audio perfor - mance and prevents switching noise from coupling into the audio signal. use wide, low-resistance output traces. as load imped - ance decreases, the current drawn from the device outputs increase. at higher current, the resistance of the output traces decrease the power delivered to the load. for example, if 2w is delivered from the speaker output to a 4 i load through a 100mi trace, 49mw is consumed in the trace. if power is delivered through a 10mi trace, only 5mw is consumed in the trace. wide output, supply, and ground traces also improve the power dissipation of the device. the MAX98302 is inherently designed for excellent rf immunity. for best performance, add ground fills around all signal traces on top or bottom pcb planes. the MAX98302 tdfn-ep package features an exposed thermal pad on its underside. this pad lowers the pack - ages thermal resistance by providing a heat conduction path from the die to the pcb. connect the exposed thermal pad to the ground plane by using a large pad and multiple vias.
10 _____________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier chip information process: cmos block diagram class d modulato r 2 inl+ 13 outl+ outl- 12 pvdd 7 0.1 f pvdd 11 shdn 1 f 1 f inl- gain 3 4 uvlo/power management click-and-pop suppression 2.6v to 5.5v low-emi driver pvdd pgnd low-emi driver gain control pvdd pgnd pgnd 1, 8, 14 MAX98302 10f class d modulato r 6 inr+ 9 outr+ outr- 10 1 f 1 f inr- 5 low-emi driver pgnd low-emi driver pvdd pvdd pgnd pvdd
______________________________________________________________________________________ 11 MAX98302 stereo 2.4w class d amplifier package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code document no. 14 tdfn-ep t1433-2 21-0137 common dimension s symbol min. max. a 0 .7 0 0 .8 0 d 2.90 3.10 e 2 .9 0 3 .1 0 a1 0.00 0.05 l 0 .2 0 0.40 pkg. code n d2 e2 e jedec spe c b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 re f 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 re f 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 re f t1433-2 14 2.300.10 1.700.10 t633- 2 6 1 .500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 re f t833- 2 8 1 .500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 re f t833- 3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 re f 2.300.10 mo229 / weed-3 2.00 re f 0.250.05 0.50 bsc 1.500.10 10 t1033-2 0.250.05 2.00 re f 10 0.50 bsc mo229 / weed-3 2.300.10 1.500.10 t1033mk-1 0.40 bsc - - - - 0.200.05 2.40 re f t1433-3f 14 2.300.10 1.700.10
12 _____________________________________________________________________________________ MAX98302 stereo 2.4w class d amplifier package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages. note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. common dimension s symbol min. max. a 0 .7 0 0 .8 0 d 2.90 3.10 e 2 .9 0 3 .1 0 a1 0.00 0.05 l 0 .2 0 0.40 pkg. code n d2 e2 e jedec spe c b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 re f 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 re f 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 re f t1433-2 14 2.300.10 1.700.10 t633- 2 6 1 .500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 re f t833- 2 8 1 .500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 re f t833- 3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 re f 2.300.10 mo229 / weed-3 2.00 re f 0.250.05 0.50 bsc 1.500.10 10 t1033-2 0.250.05 2.00 re f 10 0.50 bsc mo229 / weed-3 2.300.10 1.500.10 t1033mk-1 0.40 bsc - - - - 0.200.05 2.40 re f t1433-3f 14 2.300.10 1.700.10
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 13 ? 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. MAX98302 stereo 2.4w class d amplifier revision history revision number revision date description pages changed 0 4/10 initial release

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