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IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 1 class-g audio power amplifier with integrated charge pump converter january 2012 general description the IS31AP2031 is a class-g au dio power amplifier with automatic gain control. it drives up to 2.0w (10% thd+n) into an 8 ? speaker from a 4.2v v dd supply. the IS31AP2031 provides low cost, space saving solution for portable equipments which need audio output with higher power by boosting up supply voltage. its external components just include a few capacitors and resistors (no inductor). the IS31AP2031 use fully differential design to reduce rf noise. the IS31AP2031 integrates de-pop circuitry to reduce pop and click noise during power on/off or shutdown enable operation. the IS31AP2031 also integrates thermal and short circuit protection function. IS31AP2031 is available in qfn-20 (3mm 3mm) package. it operates from 2.7v to 4.5v over the temperature range of -40c to +85c. features ? operates from 2.7v to 4.5v ? 2.0w into an 8 ? load from a 4.2v supply(10% thd+n) ? 4 gain levels: 12db, 16db, 24db, 27.5db ? agc function ? pulse count control serial interface ? 8kv hbm esd ? thermal and short-circuit protection ? integrated click-and-pop suppression circuitry ? available in qfn-20(3mm 3mm) package applications ? smart phones ? cellular phones ? pdas ? gps ? portable electronics typical application circuit vdd gnd IS31AP2031 in- out out 10 f cn in+ cp 0.1 f 4.7 f v battery c in 22nf r in 10k c in 22nf r in 10k differential input avin 10v 10 f sdb mode control 100k fs 100k 0.1 f figure 1 typical application circuit (differential input)
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 2 vdd sdb gnd IS31AP2031 in- out out 10 f cn in+ cp 0.1 f 4.7 f v battery c in 22nf r in 10k c in 22nf r in 10k single-ended input avin 10v 10 f fs 100k mode control 0.1 f 100k figure 2 typical application circuit (single-ended input)
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 3 pin configuration package pin configuration (top view) qfn-20 pin description no. pin description 1 sdb shutdown pin. active low. 2,5,10,11,16 nc no connection. 3 cp positive input for external flying cap. 4,8 vdd power supply. 6 in- negative audio input. 7 in+ positive audio input. 9 fs pull 100k ? resistor to ground. 12,17,18 avin amplifier supply voltage. 13 out- negative audio output. 14,20 gnd gnd. 15 out+ positive audio output. 19 cn negative input for external flying cap. thermal pad connect to gnd. 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
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 4 ordering information industrial range: -40c to +85c order part no. package qty/reel IS31AP2031-qfls2-tr qfn-20, lead-free 2500
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 5 absolute maximum ratings supply voltage, v dd - 0.3v ~ +6.0v voltage at any input pin - 0.3v ~ v dd +0.3v maximum junction temperature, t jma x 150c storage temperature range, t stg - 65c ~ +150c operating temperature range, t a - 40c ~ +85c esd (hbm) 8kv 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 th e specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. dc characteristics t a = 25c, v dd = 2.7v ~ 4.5v, unless otherwise noted. typical value are t a = +25c, v dd = 3.6v. symbol parameter condition min. typ. max. unit v dd supply voltage 2.7 4.5 v i dd quiescent current v dd = v avin = 3.6v, no load 5 ma i sd shutdown current v sdb = 0v 1 a f osc clock frequency 350 khz v avin charge pump output no load 5.7 v t on charge pump soft start time 600 s |v os | output offset voltage 3 mv r in input resistor mode 1, mode 2 30 k ? mode 3, mode 4 5 f sw switching frequency 250 khz v ih input logic high voltage 1.4 v v il input logic low voltage 0.4 v i ih input logic high current v dd = 5.5v, v i = 5.8v 2.1 a i il input logic low current v dd = 5.5v, v i = 0.3v 0.8 a t otp over temperature protection (note 1) 150 c t hys hysteresis temperature (note 1) 50 c
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 6 ac characteristics (note 1) t a = 25c, v dd = 3.6v, unless otherwise noted. symbol parameter condition min. typ. max. unit po output power thd+n = 10%, f = 1khz r l = 8 ? +33h v dd = 3.6v 1.72 w v dd = 4.2v 2.0 thd+n = 1%, f = 1khz r l = 8 ? +33h v dd = 3.6v 1.38 v dd = 4.2v 1.70 thd+n total harmonic distortion plus noise v dd = 3.6v, p o = 0.5w, r l = 8 ? +33h f = 1khz 0.33 % v dd = 4.2v, p o = 1.0w, r l = 8 ? +33h f = 1khz 0.53 t wu wake-up time from shutdown 35 ms psrr power supply rejection ratio v p-p = 200mv r l = 8 ? f = 217hz -74 db v p-p = 200mv r l = 8 ? f = 1khz -68 t at attack time 10 ms t rl release time 1.2 s a max max attenuation gain -8 db t lo mode control low time 0.75 10 s t hi mode control high time 0.75 10 s t off ctrl off time for shutdown 150 s note 1: guaranteed by design.
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 7 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 = 4.2v v dd = 3.6v figure 3 thd+n vs. output power 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 input grounded figure 5 psrr vs. frequency 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 r l = 8 ? +33h v dd = 4.2v p o = 1w v dd = 3.6v p o = 500mw figure 4 thd+n vs. frequency output power(w) efficiency( % 0 10 20 30 40 50 60 00.5 11.5 2 v dd = 4.2v r l = 8 ? +33 h figure 6 efficiency vs. output power output power(w) efficiency(% 0 10 20 30 40 50 60 70 0 0.5 1 1.5 v dd = 3.6v r l = 8 ? +33 h figure 7 efficiency vs. output power power supply(v) output power(w) 0 0.5 1 1.5 2 2.5 2.5 3 3.5 4 4.5 5 r l = 8 ? +33 h f = 1khz thd+n = 10% thd+n = 1% figure 8 output power vs. power supply
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 8 application information general description the IS31AP2031 is a class-g au dio power amplifier with an integrated charge pump converter. it consists of a charge pump and a fully differential audio amplifier. the operating mode and gain are controlled by pulse count control (pcc wire) serial interface. agc function this is the function to control 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, IS31AP2031 lowers the gain of the digital amplifier to an appropriate value so as not to cause clipping at the differential signal output. the attack time is a time interval that gains falls down with a big signal input enough. and the release time is a time from target attenuation to no agc attenuation. assuming no limitation by the power supply, the audio output signal would be as in figure 9. figure 9 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 10. figure 10 agc function off with the agc function of sn2145a, the optimum output power can be obtained along with the minimal distortion. the figure 11 shows the outcome of agc function. attack time release time figure 11 agc function on operating mode the operating mode and gain are controlled by pulse count control (pcc wire) serial interface. the interface records rising edges of the sdb pin and decodes them into 4 operating mode (figure 12). if the sdb pin is pulled to high, receiving one rising edge, the ic starts up and operates in mode 1. if the sdb pin receives two rising edges, the ic operates in mode 2. if the sdb pin receives three rising edges, the ic operates in mode 3. if the sdb pin receives four rising edges, the ic operates in mode 4. mode 1 ? 12db, agc off. mode 2 ? 16db, agc on. mode 3 ? 24db, agc off. mode 4 ? 27.5, agc on. if the sdb pin is pulled to low last at least 150s, the ic will be into shutdown mode. the gain also can be controlled by the input resistors r in . mode 1: a v = 160k ? / (30k ? +r in ) mode 2: a v = 240k ? / (30k ? +r in ) mode 3: a v = 240k ? / (5k ? +r in ) mode 4: a v = 360k ? / (5k ? +r in ) sdb t hi t lo t off mode 4 sdb sdb sdb sdb mode 3 mode 2 mode 1 shutdown figure 12 operating mode control charge pump the charge pump converter boosts input supply voltage (v dd ) up to a 5.7v output voltage (v out ). v out is the supply for the class-g amplifier. the charge pump converter only needs three external components: supply decoupling capacitor, output bypass capacitor and flying capacitor. choose low esr capacitors to ensure the best operating performance and place the capacitors as close as possible to the IS31AP2031. fully differential audio amplifier the fully differential amplifier consists of a differential amplifier and a common-mode amplifier. the differential amplifier ensures that the amplifier outputs a differential voltage on the output that is equal to the differential input times the gain. the common-mode feedback ensures that the common-mode voltage at the output is biased around v dd /2 regardless of the common-mode voltage at the input.
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 9 the fully differential IS31AP2031 can still be used with a single-ended input; however, the IS31AP2031 should be used with differential inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection. advantages of fully differential amplifiers the fully differential amplifier does not require a bypass capacitor. this is because any shift in the mid-supply affects both positive and negative channels equally and cancels at the differential output. gsm handsets save power by turning on and shutting off the rf transmitter at a rate of 217hz. the transmitted signal is picked-up on input and output traces. the fully differential amplifier cancels the noise signal much better than the typical audio amplifier. input capacitors (c in ) the input capacitors and input resistors form a high-pass filter with the corner frequency, f c , determined in equation (1) when IS31AP2031 operates in mode 1 and mode 2. in in c r c f ) 30k ( 2 1 ? ? ? ? (1) follow the equation (2) when IS31AP2031 operates in mode 3 and mode 4. in in c r c f ) 5k ( 2 1 ? ? ? ? (2) the value of the input capacitor is important to consider 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. 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 impedance mismatch at the corner frequency and below. design note component selection the value and esr of the output capacitor for charge pump will affect output ripple and transient performance. a x7r or x5r ceramic capacitor in 10 f should be recommended. the flying capacitor should use a 4.7f x7r or x5r ceramic capacitor. all the capacitors should support at least 10v. pcb layout the decoupling capacitors should be placed close to the vdd pin and the output capacitors should be placed close to the avin pin. the flying capacitor should be placed close to the cn and cp pins. the input capacitors and input resistors should be placed close to the in+ and in- pins and the traces must be parallel to prevent noise. the traces of out+ and out- pins connected to the speaker should be as possible as short and wide. the recommended width is 0.5mm. trace width should be at least 0.75mm when the current reaches 1a. trace width should be at least 1.0mm for the power supply and the ground plane. the thermal pad and the gnd pin should connect directly to a strong common ground plane for heat sinking.
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 10 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 13 classification profile
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 11 tape and reel information
IS31AP2031 integrated silicon solution, inc. ? www.issi.com rev.a, 12/28/2011 12 package information qfn-20 note: all dimensions in millimeters unless otherwise stated.

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