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IS31AP2145A integrated silicon solution, inc. ? www.issi.com 1 rev.a, 11/20/2011 2.9w@5.0v mono clip-less & filter-less class-d audio power amplifier december 2011 general description the IS31AP2145A is a 2.9w@5.0v mono, clip-less, filter-less, high efficiency class-d audio power amplifier with automatic gain control. the IS31AP2145A integrates agc (automatic gain control) function to automatically prevent distortion of the audio signal by which we can enhance audio quality and also protect the speaker from damage at high power levels. the agc function and its attack time/release time are selectable via the ctrl pin. the IS31AP2145A also provides thermal and over current protection functions. in addition to these features, 90% high efficiency, improved rf-rectification immunity, a fast start-up time and small package size make IS31AP2145A ideal choice for cellular handsets, pdas and other portable applications. IS31AP2145A is available in a 1.5mm1.5mm utqfn-9 package. features ? filter-less class-d architecture ? agc enable/disable function ? 2.9w into 4 ? at 5.0v (10% thd+n) ? power supply range: 2.7v to 5.5v ? selectable attack and release times ? minimum external components ? high efficiency: 90% ? click-and-pop suppression ? low shutdown current: 0.1 a ? short-circuit and thermal protection ? space-saving utqfn-9, 1.5mm 1.5mm applications ? wireless or cellular handsets and pdas ? portable navigation devices ? portable dvd player ? notebook pc ? educational toys ? usb speakers ? portable gaming typical application circuit out+ gnd IS31AP2145A a2 a1 c3 a3 b2 vdd out- 1 f in+ in- vref c in 33nf c in 33nf ctrl c1 c2 differential in v battery 0.1 f 1 f b1,b3 0.1 f ctrl1 ctrl2 r 1 r 2 r 3 figure 1 typical application circuit (differential input)
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 2 rev.a, 11/20/2011 figure 2 typical application circuit (single-ended input)
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 3 rev.a, 11/20/2011 pin configuration package pin configuration (top view) utqfn-9 pin description no. pin description a1 in+ positive input terminal. a2 vdd power supply. a3 out+ positive output terminal. b1, b3 gnd ground. b2 vref analog reference power supply terminal. c1 in- negative input terminal. c2 ctrl power down and agc control terminal. c3 out- negative output terminal. copyright ? ? ? 2011 ? integrated ? silicon ? solution, ? inc. ? all ? rights ? reserved. ? issi ? reserves ? the ? right ? to ? make ? changes ? to ? this ? specification ? and ? its ? products ? at ? any ? time ? without ? notice. ? issi ? assumes ? no ? liability ? arising ? out ? of ? the ? application ? or ? use ? of ? any ? information, ? products ? or ? services ? described ? herein. ? customers ? are ? advised ? to ? obtain ? the ? latest ? version ? of ? this ? device ? specification ? before ? relying ? on ? any ? published ? information ? and ? before ? placing ? orders ? for ? products. ? integrated ? silicon ? solution, ? inc. ? does ? not ? recommend ? the ? use ? of ? any ? of ? its ? products ? in ? life ? support ? applications ? where ? the ? failure ? or ? malfunction ? of ? the ? product ? can ? reasonably ? be ? expected ? to ? cause ? failure ? of ? the ? life ? support ? system ? or ? to ? significantly ? affect ? its ? safety ? or ? effectiveness. ? products ? are ? not ? authorized ? for ? use ? in ? such ? applications ? unless ? integrated ? silicon ? solution, ? inc. ? receives ? written ? assurance ? to ? its ? satisfaction, ? that: ? a.) ? the ? risk ? of ? injury ? or ? damage ? has ? been ? minimized; ? b.) ? the ? user ? assume ? all ? such ? risks; ? and ? c.) ? potential ? liability ? of ? integrated ? silicon ? solution, ? inc ? is ? adequately ? protected ? under ? the ? circumstances
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 4 rev.a, 11/20/2011 ordering information industrial range: -40c to +85c order part no. package qty/reel IS31AP2145A-utls2-tr utqfn-9, lead-free 3000
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 5 rev.a, 11/20/2011 absolute maximum ratings (note 1) supply voltage, v dd - 0.3v ~ +6.0v voltage at any input pin - 0.3v ~ v dd +0.3v junction temperature, t jmax 150c storage temperature range, t stg - 65c ~ +150c operating temperature range ? 40c ~ +85c esd (hbm) 7kv note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress rating s only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the sp ecifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical characteristics t a = -40c ~ +85c, v dd = 2.7v ~ 5.5v, unless otherwise noted. typical value are v dd = 3.6v, t a = +25c. symbol parameter condition min. typ. max. unit v dd supply voltage 2.7 5.5 v i dd quiescent current 2 ma i sd shutdown current v ctrl = 0v 0.1 a f sw switching frequency v dd = 2.7v ~ 5.5v 300 khz gain audio input gain 18 db agc characteristics v agc1 agc1 mode setting threshold voltage 1.4 v dd v v agc2 agc2 mode setting threshold voltage 0.64 1.05 v v off agc off mode setting threshold voltage 0.36 0.6 v v sd shutdown mode setting threshold voltage 0 0.14 v t at1 attack time 1 45 ms t rt1 release time 1 2.6 s t at2 attack time 2 10 ms t rt2 release time 1.2 s a max maximum attenuation gain -10 db
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 6 rev.a, 11/20/2011 electrical characteristics agc off, t a = +25c, v dd = 3.6v, unless otherwise noted. symbol parameter condition min. typ. max. unit p o output power thd+n = 10% f = 1khz r l = 4 ? +33h v dd = 5.0v 2.90 w thd+n = 1% f = 1khz r l = 4 ? +33h v dd = 5.0v 2.30 w thd+n = 10% f = 1khz r l =8 ? +33h v dd = 5.0v 1.68 w thd+n = 1% f = 1khz r l = 8 ? +33h v dd = 5.0v 1.38 w thd+n total harmonic distortion plus noise v dd = 3.6v, p o = 0.5w, r l = 8 ? +33h f = 1khz 0.165 % v dd = 3.6v, p o = 1.0w, r l = 4 ? +33h f = 1khz 0.175 psrr power supply rejection ratio v p-p = 200mv r l = 8 ? f = 217hz -72 db v p-p = 200mv r l = 8 ? f = 1khz -65 db maximum efficiency p o = 1.0w r l = 8 ? +33h f = 1khz 90 % t st start-up time 34 ms t wk wake-up time 40 ms t sd shutdown time 80 ms t mod mode switching time 0.1 ms
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 7 rev.a, 11/20/2011 typical performance characteristics thd+n(%) output power(w) 20 0.1 0.2 0.5 1 2 5 10 10m 3 20m 50m 100m 200m 500m 12 r l = 8 ? +33h f = 1khz v dd = 3.6v v dd = 4.2v v dd = 5.0v figure 3 thd+n vs. output power 0.01 0.02 0.05 0.1 0.2 1 2 10 thd+n(%) 20 20k 50 100 200 500 1k 2k 5k 10k frequency(h z) 20 v dd = 3.6v p o = 500mw r l = 8 ? +33h figure 5 thd+n vs. frequency output power(w) efficiency(% 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 v dd = 3.6v~5.0v r l = 8 ? +33 h figure 7 efficiency vs. output power thd+n(%) output power(w) 20 0.1 0.2 0.5 1 2 5 10 10m 3 20m 50m 100m 200m 500m 12 r l = 4 ? +33h f = 1khz 4 v dd = 3.6v v dd = 4.2v v dd = 5.0v figure 4 thd+n vs. output power 0.01 0.02 0.05 0.1 0.2 1 2 10 thd+n(%) 20 20k 50 100 200 500 1k 2k 5k 10k frequency(h z) 20 v dd = 3.6v p o = 1.0w r l = 4 ? +33h figure 6 thd+n vs. frequency output power(w) efficiency(% 0 10 20 30 40 50 60 70 80 90 100 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 v dd = 3.6v~5.0v r l = 4 ? +33 h figure 8 efficiency vs. output power
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 8 rev.a, 11/20/2011 supply voltage(v) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.5 3.5 4.5 5.0 r l = 8 ? +33h agc off thd+n = 1% thd+n = 10% output power(w) figure 9 output power vs. supply voltage output power(w) supply voltage(v) 2.5 3.5 4.5 5.0 0 0.5 1 1.5 2 2.5 3 r l = 4 ? +33h agc off thd+n = 1% thd+n = 10% figure 11 output power vs. supply voltage psrr(db) 20 20k 50 100 200 500 1k 2k 5k 10k frequency(h z) -120 +0 -100 -80 -60 -40 -20 v dd = 3.6v, 4.2v r l = 8 ? +33 h figure 13 psrr vs. frequency supply voltage(v) 2.5 3.5 4.5 5.0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 r l = 8 ? +33h agc1 thd+n = 1% thd+n = 10% output power(w) figure 10 output power vs. supply voltage output power(w) supply voltage(v) 2.5 3.5 4.5 5.0 0 0.5 1 1.5 2 2.5 r l = 4 ? +33h agc1 thd+n = 10% thd+n = 1% figure 12 output power vs. supply voltage
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 9 rev.a, 11/20/2011 application information digital amplifier the IS31AP2145A is a 2.9w@5.0v mono, clip-less, filter-less, high efficiency class-d audio power amplifier with automatic gain control. the IS31AP2145A integrates agc (automatic gain control) function to automatically prevent distortion of the audio signal by which we can enhance audio quality and also protect speaker from damage at high power levels. in addition, IS31AP2145A has been designed so that high-efficiency can be maintained within an average power range that is used for mobile terminal. agc (automatic gain control) control function this is the function to cont rol the output in order to obtain a maximum output level without distortion when an excessive input is applied which would otherwise cause clipping at the differential signal output. that is, with the agc function, IS31AP2145A lowers the gain of the digital amplifier to an appropriate value so as not to cause clipping at the differential signal output (figure 14). figure 14 operation of agc function
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 10 rev.a, 11/20/2011 the attack time and the release time of agc control have two levels (refer to table 1). they are selected by the voltage at the ctrl terminal (refer to table 2). the attack time is a time interval that gain falls from 18db to 10db with a big signal input enough. and the release time is a time from target attenuation to no agc attenuation. table 1 attack time and release time agc mode attack time release time agc1 (recommended) 45ms 2.6s agc2 10ms 1.2s assuming no limitation by the power supply, the audio output signal would be as in figure 15. figure 15 assuming no restriction from power supply, the audio output signal in normal operation without the agc, the output is distorted because of the restriction from power supply, as shown in figure 16. figure 16 agc function off with the agc function of IS31AP2145A, the optimum output power can be obtained along with the minimal distortion. the figure 17 shows the outcome of agc function. attack time release time figure 17 agc function on ctrl terminal function by setting the threshold voltage of each mode to ctrl terminal, the followings can be set: agc1, agc2, agc off, and shutdown mode (table 2 and figure 18). figure 18 agc function mode setting table 2 mode setting ctrl1 ctrl2 mode h h agc1 h gnd agc2 gnd h agc off gnd gnd shutdown ?h? level indicates a microcomputer?s i/o port h level output voltage that is input to ctrl1 and ctrl2 terminals and gnd indicates gnd of the microcomputer. gnd level of the microcomputer must be the same as that of IS31AP2145A. the control of ctrl terminal is based on i/o port h level output voltage of microcomputer that is connected. set resistance constants according to i/o port h level output voltage of each microcomputer as table 3 below. table 3 resistors setting v i/o 1.8v 2.6v 2.8v 3.0v 3.3v 5.0v r1 27k ? 33k ? 33k ? 33k ? 33k ? 56k ? r2 56k ? 68k ? 68k ? 68k ? 68k ? 120k ? r3 82k ? 27k ? 24k ? 22k ? 18k ? 15k ? functions of ctrl pin are designed with their control by two control pins (ctrl1 and ctrl3). only a switching control between agc1 mode and shutdown mode is available when a single control terminal is used (table 4 and figure 19). figure 19 agc1 mode circuit table 4 mode setting ctrl1 mode h agc1 gnd shutdown system timing the ctrl terminal should be configured as the figure 20. when in the shutdown mode, the level of the terminal must not be changed from gnd level during t sd . when the IS31AP2145A wakes up, the ctrl terminal must be set to h level first, then enter the setting mode.
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 11 rev.a, 11/20/2011 figure 20 system timing input capacitors (c in ) the input capacitors (c in ) and internal resistor (r in = 28.5k ? ) form a high-pass filter with the corner frequency, f c , determined in equation (1). in in c r c f ? 2 1 ? (1) for example, in figure 1, c in = 33nf, r in = 28.5k ? , so, hz c f nf k 169 33 5 . 28 2 1 ? ? ? ? ? ? the capacitors should have a tolerance of ? decoupling capacitor (c s ) the IS31AP2145A is a high performance class-d audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (thd) is low. for higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (esr) ceramic capacitor, typically 0.1 f, placed as close as possible to the device vdd lead works best. placing this decoupling capacitor close to the IS31AP2145A is very important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. for filtering lower frequency noise signals, a 1 f or greater capacitor placed near the audio power amplifier would also help.
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 12 rev.a, 11/20/2011 classification reflow profiles profile feature pb-free assembly preheat & soak temperature min (tsmin) temperature max (tsmax) time (tsmin to tsmax) (ts) 150c 200c 60-120 seconds average ramp-up rate (tsmax to tp) 3c/second max. liquidous temperature (tl) time at liquidous (tl) 217c 60-150 seconds peak package body temperature (tp)* max 260c time (tp)** within 5c of the specified classification temperature (tc) max 30 seconds average ramp-down rate (tp to tsmax) 6c/second max. time 25c to peak temperature 8 minutes max. figure 21 classification profile
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 13 rev.a, 11/20/2011 tape and reel information note: all dimensions in millimeters unless otherwise stated.
IS31AP2145A integrated silicon solution, inc. ? www.issi.com 14 rev.a, 11/20/2011 packaging information utqfn-9

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