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MP1740 3w high efficiency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 1 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved the future of analog ic technology description the MP1740 is a high efficiency class-d h- bridge audio amplifier. it utilizes a full bridge output structure capable of delivering 3w into 4 ? speaker. the device exhibits the high fidelity of a class ab amplifier with an efficiency of 91%. it also dramatically reduces solution size by integrating the following: z 300m ? (high side or low side) power mosfets (vcc=3.6v) z startup / shutdown pop elimination z short circuit protection z 9 balls wafer chip scale package (wlcsp) and requires a few external components. this amplifier also improves gsm power supply rejection, and operates on a single cellular li- ion battery. the gain of this amplifier can be controlled easily by a few modification of external configuration while minimizing noise to 37 vrms. features ? 3w into 4 ? with 5 v supply @ 10% thd+n ? efficiency up to 90% at 1.7w pout, 8 ohm load ? 2.5v to 5.5v supply voltage operation ? thd+n = 0.1% @ 1.8w, 5v, 4 ? ? 2ma quiescent current and 0.5 a shutdown current ? full bridge output drive ? internal 250khz switching frequency ? fully differential input ? improved cmrr eliminates two input coupling capacitors ? 1ms start-up time eliminates pop ? integrated short circuit protection ? integrated thermal shutdown ? 9 balls wafer chip scale package (wlcsp) applications ? wireless or cellular handsets ? pdas all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MP1740 en avcc agnd inn inp von pgnd pvcc vop r i r i in + in - out - out + en to battery cs tnd+n vs. p out fs=1khz, v cc =5v, gain=2v/v no weighting thd+n (%) p out (w) 0.01 20 0.02 0.05 0.1 0.2 0.5 1 2 5 10 60m 4 100m 200m 300m 500m 1 2 3
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 2 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved ordering information part number* package top marking free air temperature (t a ) MP1740ec wlcsp 6f ?20 c to +85 c package reference top view von agnd inp pgnd pvcc avcc vop en inn 3 2 1 c b a bottom view 3 2 1 a b c von agnd inp pgnd pvcc avcc vop en inn absolute maxi mum ratings (1) supply voltage v cc ........................-0.3v to 6.5v input voltage v in ................. ?0.3v to v cc + 0.3v input voltage v en ................ ?0.3v to v cc + 0.3v ambient temperature t a .......... ?40 c to +85 c continuous power dissipation (t a = +25c) (2) ................................................................ 1w junction temperature t j ......... ?40 c to +140 c lead temperature ....................................260 c storage temperature.............. ?65 c to +150 c recommended operating conditions (3) supply voltage v cc .........................2.5v to 5.5v enable voltage v en ..................... 70%v cc to v cc disable voltage v en ..................... 0v to 15%v cc common mode input voltage v ic ............................... 0.5v to vcc-0.8v operating junct. temp (t j )..... ?20 c to +125 c thermal resistance (4) ja jc wlcsp ..................................114 ..... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j(max) , the junction-to-ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by pd (max) =(t j(max) -t a )/ ja . exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) vcc include avcc and pvcc, vin include inp and inn 4) measured on jesd51-7, 4-layer pcb
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 3 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved electrical characteristics t a = +25 c, unless otherwise noted. parameter symbol conditions min typ max unit output offset voltage |v os | vi=0v, av=2v/v, vcc=2.5v to 5.5v 1 25 mv power supply rejection ratio psrr vcc=2.5v to 5.5v -70 -45 db common mode rejection ratio cmrr vcc=2.5v to 5.5v, vic 1/2vcc to 0.5v, vic 1/2vcc to vcc -0.8v -70 db high-level input current i ih vcc=5.5v, vi=5.5v,ri=150k ? 20 30 a low-level input current i il vcc=5.5v, vi=0v,ri=150k ? 20 30 a vcc=5.5v, no load, switching 2.7 5.8 vcc=3.6v, no load, switching 2 4.6 quiescent current i q vcc=2.5v, no load, switching 1.6 3.6 ma shut down current i ds ven=0, vcc=2.5v to 5.5v 0.5 2 a ven enable l-h vcc=2.5v to 5.5v 1.6 v ven enable h-l vcc=2.5v to 5.5v 0.4 v uvlo_h vcc from low to high 2.4 2.48 v uvlo_l vcc from high to low 1.95 2.1 v vcc=5.5v 250 vcc=3.6v 300 static on-state resistance rds_on vcc=2.5v 360 m ? output impedance in disable r o ven<0.8v 2 k ? switching frequency f sw vcc=2.5v to 5.5v 200 250 300 khz gain (vo/vi) r i =15 k ? , no load 19 20 21 v/v rpd resistance from en to gnd 300 k ?
mps confidential do n o t distri b ute MP1740 ?3w high effciency mono class-d audio amplifier mps confidential and proprietary information ? internal use only MP1740 MP1740 rev. 1.0 4 1/5/2012 operation characteristics vcc=avcc=pvcc=en, agnd = pgnd = 0v, signal frequency fs=1khz, r i =150 ? , gain=2 v/v, c i =2.2uf, t a = +25c, unless otherwise noted. parameter symbol conditions min typ max unit vcc=5.5v 2.82 vcc=5v 2.32 vcc=3.6v 1.16 thd+n=1%, f s =1khz, r l =4 ? vcc=2.5v 0.54 vcc=5.5v 3.62 vcc=5v 3.0 vcc=3.6v 1.51 thd+n=10%, f s =1khz, r l =4 ? vcc=2.5v 0.70 vcc=5.5v 1.65 vcc=5v 1.36 vcc=3.6v 0.71 thd+n=1%, f s =1khz, r l =8 ? vcc=2.5v 0.33 vcc=5.5v 2.12 vcc=5v 1.74 vcc=3.6v 0.91 output power p out thd+n=10%, f s =1khz, r l =8 ? vcc=2.5v 0.42 w p out =2w, f s =1khz, r l =4 ? vcc=5v 0.19% p out =1w, f s =1khz, r l =4 ? vcc=3.6v 0.14% p out =0.4w, f s =1khz, r l =4 ? vcc=2.5v 0.11% p out =1w, f s =1khz, r l =8 ? vcc=5v 0.11% p out =0.5w, f s =1khz, r l =8 ? vcc=3.6v 0.12% total distorsion plus noise thd+n p out =0.2w, f s =1khz, r l =8 ? vcc=2.5v 0.13% supply ripple rejection ratio k svr f ripple =217hz, v ripple =400mvpp, input ac-ground with c i =0.22 f vcc=5v -62 db signal to noise ratio snr p out =1w, r l =8 ? 97.7 db no weighting 53 output noise v n vcc=5v, f=20 to 20khz, input ac- ground with c i =0.22 f a-weighting 37 v rms common mode rejection ratio cmrr v ic-ripple =1 v pp , f ripple =217hz vcc=5v -65 db start-up time from disable t s 1 ms
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 5 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved pin functions ball wlcsp name input/ouput /power (i/o/p) description a1 inp i positive differential input a2 agnd p analog ground a3 von o negative btl output b1 avcc p analog power supply b2 pvcc p power supply b3 pgnd p power ground c1 inn i negative differential input c2 en i enable input. (drive high to enable the MP1740) c3 vop o positive btl output typical performanc e characteristics test set-up for graphs + - en vcc cs 40khz low pass filter measurement output c i load c i + - measurement input 0.22uf cs 0.22uf cs 10uf MP1740 en avcc agnd inp inn von pgnd pvcc vop r i r i notes : 5) c i was shorted for any common-mode input voltage measurement 6) a 33h inductor was placed in series wi th the load resistor to emulate a sm all speaker for efficiency measurements. 7) the 40 khz low-pass filter is required ev en if the analyzer has a low-pass filter. 8) for psrr test, please remove the great 10uf decoupling c apacitor and just keep the small decoupling capacitors for recovery switching currents.
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 6 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved typical performanc e characteristics vcc=avcc=pvcc=en, agnd = pgnd = 0v, signal frequency fs=1khz, r i =150kohm, gain=2 v/v, c i =2.2uf, t a = +25c, unless otherwise noted. thd+n (%) thd+n (%) p out (w) frequency (hz) frequency (hz) 0.01 20 0.02 0.05 0.1 0.2 0.5 1 2 5 10 -10 +4 -8 -6 -4 -2 +0 +2 10 40k 20 50 100 200 500 1k 2k 5k 10k 20k 20 20k 50 100 200 500 1k 2k 5k 10k d b r a - 100 +0 -90 -80 -70 -60 - 50 - 40 -30 -2 0 -1 0 20 20 k 50 100 200 500 1k 2 k 5 k 10 k psrr vs.frequency 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 efficiency(%) 0 0.1 0.2 0.3 0.4 0.5 0.6 0 0.5 1 1.5 2 2.5 3 power dissipation(w) power dissipation vs. p out v cc =5v efficiency vs. p out v cc =5v frequency (hz) psrr (db) 60m 4 100m 200m 300m 500m 1 2 3 2.5v 3.6v 5v 5.5v thd+n (%) thd+n (%) p out (w) frequency (hz) frequency (hz) 0.01 20 0.02 0.05 0.1 0.2 0.5 1 2 5 10 0.01 20 0.02 0.05 0.1 0.2 0.5 1 2 5 10 60m 2 3 100m 200m 300m 500m 1 -10 +4 -8 -6 -4 -2 +0 +2 10 40k 20 50 100 200 500 1k 2k 5k 10k 20k 0.001 20 0.01 0.1 1 5 20 20k 50 100 200 500 1k 2k 5k 10k 50mw 250mw 1w d b r a p out (w) p out (w) 2.5v 5.5v 3.6v 5v 100mw 2w 500mw r l r l r l r l
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 7 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved typical performanc e characteristics (continued) vcc=avcc=pvcc=en, agnd = pgnd = 0v, signal frequency fs=1khz, r i =150kohm, gain=2 v/v, c i =2.2uf, t a = +25c, unless otherwise noted . 20 20 k 50 100 200 500 1k 2 k 5 k 10 k output power vs. supply voltage 0 0.5 1 1.5 2 2.5 3 3.5 4 supply voltage(v) output power(w) frequency (hz) cmrr (db) -80 +0 -70 -60 -50 -40 -30 -20 -10 2 2.5 3 3.5 4 4.5 5 5.5 6
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 8 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved function block diagram r3 pvcc r3 r2 r2 c c r1 r1 ri ri audio input + + audio input - - gain=(r1/ri)*(r3/r2) internal external speaker ocp& de-pop pvcc pvcc avcc pgnd agnd inn inp von vop pgnd pgnd uvlo reference thermal protection triangular generator en en gate drive gate drive comparator comparator start- up& other logic fda fda figure 1?functional block diagram
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 9 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved application information component selection the MP1740 uses a minimum number of external components to complete a fully bridged class d audio amplifier. use the following sections to customize the amplifier for your particular application. 1. setting the voltage gain the voltage gain sets the output voltage swing for a given input voltage swing and is set by the input resistors (r i ) as the following equation: i 150k ? gain=2 r (1) the maximum output voltage swing is limited by the power supply. to achieve the maximum output power of the MP1740 amplifier, set the amplifier gain such that the maximum peak-to- peak input signal results in at least the maximum peak-to-peak output voltage swing. lower gain allows the MP1740 to operate at its best, because a higher voltage at the input for the same output power making the inputs less susceptible to noise. so setting voltage gain to 2v/v may achieve optimal performance. 2 . input coupling capacitors (c i ) the MP1740 is a mono btl class-d amplifier with differential inputs and outputs. this device can still be used with a single-ended input; but for some noisy environment (such as a wireless handset) the MP1740 should be used with differential inputs to ensure maximum noise rejection. the fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. the input coupling capacitors are not required if the design uses a differential source that is biased from 0.5 v to vcc - 0.8 v (as shown in recommended operating conditions). if the input signal is not biased within the recommended common-mode input range or if using a single-ended source, the input coupling capacitors are used to pass only the ac audio signal to the input of the amplifier as a high pass filter. the input capacitors create a high-pass filter with the input resistor. choose an input coupling capacitor such that the corner frequency f c is less than the desired pass-band frequency. the formula for the corner frequency is: c ii 1 f= 2 rc (2) speakers in wireless handsets usually can?t respond well to low frequencies, so for this application the corner frequency can be set to block the low frequencies. the input coupling capacitance is calculated as: i ic 1 c= 2 rf (3) if the corner frequency is within the audible 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. 3. power supply decoupling capacitor (c s ) the class-d audio amplifier requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (thd) is low. to carry the higher frequency transient current, spikes, or digital hash on the line, a good low esr ceramic capacitor is necessary. place a 1 f decoupling capacitor as close as possible to the device vcc lead. it is very important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace between the capacitor and the device may cause a loss. a 10 f or greater capacitor placed near the audio power amplifier would also help for filtering lower- frequency noise. 4. input resistors (r i ) in fully differential amplifiers, please use the matching input resistors. matching is very important for the balance of the output on the reference voltage (more important than overall tolerance). the higher matching, the batter cmrr and psrr performance. therefore, it is recommended to use 1% precision resistors or better to keep the performance optimized. place the input resistors as close to the MP1740 as possible to limit noise injection on the high- impedance nodes.
MP1740 ?3w high effciency mono class-d audio amplifier MP1740 rev. 1.0 www.monolithicpower.com 10 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved typical application circuit differential input en avcc agnd inp MP1740 inn von pgnd pvcc vop r i r i in+ in- out+ out- en to battery cs cs figure 2?MP1740 application schematic with differential input (input dc-biased voltage is within the recommended common-mode voltage range) differential input MP1740 en avcc agnd inp inn von pgnd pvcc vop r i r i in+ in- out+ out- en to battery cs c i cs c i figure 3?MP1740 application schematic with differential input (input dc-biased voltage is out of the recommended common-mode voltage range) MP1740 en avcc agnd inp inn von pgnd pvcc vop r i c i c i r i out+ out- en to battery cs cs single-ended input figure 4?MP1740 application schematic with single-ended input
MP1740 ?3w high effciency mono class-d audio amplifier notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP1740 rev. 1.0 www.monolithicpower.com 11 1/5/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information wlcsp top view a 1 3 c bottom view 1.50 1.60 1.50 1.60 1.00 ref 0.50 bsc pin 1 id marking 1.00 0.50 0.25 recommended land pattern note: 1) all dimensions are in millimeters. 2) ball coplanarity shall be 0.05 millimeter max. 3) jedec reference is mo-211, variation dd. 4) drawing is not to scale. 1.00 ref pin 1 id index area side view 0.38 ref 0.21 0.27 1.00 0.28 0.34 2 b 0.57 0.67

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