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3 watt mono filter-free class-d audio power amplifier features efficiency with an 8- speaker: 88% at 400 mw 80% at 100 mw 2.6ma quiescent current 0.4 a shutdown current optimized pwm output stage eliminates lc output filter internally generated 250-khz switching frequency eliminates capacitor and resistor improved psrr (?75 db) and wide supply voltage (2.5 v to 5.5 v) eliminates need for a voltage regulator fully differential design reduces rf rectification and eliminates bypass capacitor improved cmrr eliminates two input coupling capacitors available in space-saving package: 9-bump wlcsp general description the LR6311 is a 3-w high efficiency filter-free cla ss-d audio power amplifier in a wafer chip scale package (wcsp) that requires only three external components. features like 88% efficiency, ?75db psrr, and improved rf-rectification immunity make the lr 6311 ideal for cellular handsets. in cellular handsets, the e a rpiece, speaker phone, and melody ringer can each be driven by the LR6311. a pplications mobile phone pda mp3/4 pmp portable electronic devices leshan radio co ., ltd 1/13 LR6311
p in diagrams 1 2 3 a b c top view i n+ g nd v o- v dd p vdd p gnd i n- s db v o+ p in description pin # name description a 1 in+ positive differential input a 2 gnd power ground a 3 vo- negative btl output b 1 vdd power supply b 2 pvdd power supply b 3 pgnd power ground c 1 in- negative differential input c 2 sdb shutdown terminal (low active) c 3 vo+ positive btl output f unction block diagram v o+ vo- 1 50k 1 50k i n+ in- a mp1 a v1 = 150k/ri s hutdown control b ias & reference o sc & ramp o c detect s tart up & protection 3 00k s db p vdd p gnd g nd v dd ( b1) (b2) (a3) (c3) (b3) (a2) (c1) (a1) (c2) p wm modulator and power driver av2 = 2 v/v n otes: i r k a vavgain voltage total 150 221 == figure 1. function block diagram leshan radio co ., ltd 2/13
a pplication circuit r i r i c s t o battery s db v o+ vo- v i- vi+ o sc & ramp b ias & shutdown v dd gnd p w m & b t l ( c l o s e d l o o p ) + - + - d ifferential input f igure 2. LR6311 application schematic with differential input r i r i c s t o battery c i c i s db v o+ vo- v i- vi+ o sc & ramp b ias & shutdown v dd gnd p w m & b t l ( c l o s e d l o o p ) + - + - d ifferential input f igure 3. LR6311 application schematic with differential input and input capacitors r i r i c s t o battery c i s db v o+ vo- v i- vi+ o sc & ramp b ias & shutdown v dd gnd p w m & b t l ( c l o s e d l o o p ) + - + - s ingle-ended input c i f igure 4. LR6311 application schematic with single-ended input leshan radio co ., ltd 3/13
e lectrical characteristics t he following specifications apply for the circuit shown in figure 5. t a = 25 , unless otherwise specified. s pec s ymb ol parameter conditions min. typ. max. u nits i s d shutdown current v i n = 0v, v s db = 0v, no load 0 .4 2 ua v d d = 2.5v, v i n = 0v, no load 2 .0 v d d = 3.6v, v i n = 0v, no load 2 .6 i q quiescent current v d d = 5.5v, v i n = 0v, no load 3 .0 8 ma o s v o utput offset voltage v i n = 0v, a v = 2v/v, v d d = 2.5v to 5.5v 2 25 mv p srr power supply rejection ratio v d d = 2.5v to 5.5v - 75 db cm rr common mode rejection ratio v d d = 2.5v to 5.5v, v i c = v d d / 2 to 0.5v, v i c = v d d / 2 to v d d - 0.8v - 68 db f s w modulation frequency v d d = 2.5v to 5.5v 200 250 300 khz a v voltage gain v d d = 2.5v to 5.5v i r 2 85k i r 3 00k i r 3 15k v /v r s db resistance from sdb to gnd 3 00 k z i input impedance 142 150 158 k t w u wake-up time from shutdown v d d = 3.6v 1 ms v d d = 2.5v 700 v d d = 3.6v 500 r d s(on) drain-source resistance (on-state) v d d = 5.5v 400 m o perating characteristics v d d = 5v, r i = 150k , t a = 25 , unless otherwise specified. s pec s ymb ol parameter conditions min. typ. m ax. u nits t hd+n=10%, f=1khz, r l = 4 3.0 t hd+n=1%, f=1khz, r l = 4 2.4 t hd+n=10%, f=1khz, r l = 8 1.7 p o output power thd+n=1%, f=1khz, r l = 8 1.4 w t hd+n t otal harmonic distortion + noise po=1.0wrms, f=1khz, r l = 8 0.19 % s nr signal-to-noise ratio v d d = 5v, po=1.0wrms, r l = 8 97 db v d d = 3.6v, r i = 150k , t a = 25 , unless otherwise specified. s pec s ymb ol parameter conditions min. typ. m ax. u nits t hd+n=10%, f=1khz, r l = 4 1.5 t hd+n=1%, f=1khz, r l = 4 1.2 t hd+n=10%, f=1khz, r l = 8 0.9 p o output power thd+n=1%, f=1khz, r l = 8 0.7 w t hd+n t otal harmonic distortion + noise po=0.5wrms, f=1khz, r l = 8 0.19 % k s vr s upply ripple rejection ratio v d d = 3.6v, input ac-grounded with c i = 2uf f=217hz, v(ripple)=200mv p p -68 db n o weighting 48 v n output voltage noise v d d = 3.6v, input ac-grounded with c i = 2uf, f=20~20khz a weighting 36 uv r ms cm rr common mode rejection ratio v d d = 3.6v, v i c = 1 v p p , f=217hz -70 db v d d = 2.5v, r i = 150k , t a = 25 , unless otherwise specified. p arameter conditions spec units leshan radio co ., ltd 4/13
te st circuit 1u f in + in- vdd gnd vo+ vo- LR6311 15 0k 15 0k 2u f 2u f rl 30 khz lpf si gnal input from measurement output to measurement + - po wer supply c s ci c i ri ri sdb sh utdown signal v o v in fi gure 5. LR6311 test set up circuit 10 0 47 nf 10 0 47 nf 30 khz lpf vo+ vo- v o fi gure 6. 30-khz lpf for lr6 311 test no tes: 1>. c s should be placed as close as possible to vdd/gnd pad of the device 2>. ci should be shorted for any common-mode input voltage measurement leshan radio co ., ltd 5/13 symb ol min. typ. max. thd+n=10%, f=1khz, r l = 4 0.7 thd+n=1%, f=1khz, r l = 4 0.55 thd+n=10%, f=1khz, r l = 8 0.4 thd+n=1%, f=1khz, r l = 8 0.3 thd+n total harmonic distortion + noise po=0.2wrms, f=1khz, r l = 8 0.19 % parameter conditions spec units
3 >. a 33uh inductor should be used in series with r l for efficiency measurement 4>. the 30 khz lpf (shown in figure 5) is required even if the analyzer has an internal lpf c omponent recommended d ue to the weak noise immunity of the single-ended input application, the differential input application should be used whenever possible. the typical component values are listed in the table: r i c i c s 1 50 k 3.3 nf 1 uf ( 1) c i should have a tolerance of 10% or better to reduce impedance mismatch. ( 2) u se 1% tolerance resistors or better to keep the performance optimized, and place the r i close to the device to limit noise injection on the high- impedance nodes. i nput resistors (r i ) & capacitors (c i ) t he input resistors (r i ) set the total voltage gain of the amplifier according to e q1 1 1 502 eq v v r k gain i ? ? ? ? ? ? w = t he input resistor matching directly affects the cmrr, psrr, and the second harmonic distortion cancellation. if a differential signal source is used, and the signal is biased from 0.5v ~ v d d - 0 .8v (shown in figure2), the input capacitor (c i ) is not required. if the input signal is not biased within the recommended common-mode input range in differential input application (shown in figure3), or in a single-ended input application (shown in figure4), the input coupling capacitors are required. if the input coupling capacitors are used, the r i and c i form a high-pass filter (hpf). the corner frequency (f c ) of the hpf can be calculated by e q2 ( ) 2 2 1 e q hz cr f ii c = p d ecoupling capacitor (c s ) a good low equivalent-series-resistance (esr) ceramic capacitor (c s ) , used as power supply decoupling capacitor (c s ) , is required for high power supply rejection (psrr), high efficiency and low total harmonic distortion (thd). typically c s is 1f, placed as close as possible to the device vdd pin. leshan radio co ., ltd 6/13
a udio precision c olor sweep trace line style thick data axis com m ent 1 1 cyan solid 1 analyzer.thd+n ratio b left 2.5v 2 1 green solid 1 analyzer.thd+n ratio b left 3v 3 1 yellow solid 1 analyzer.thd+n ratio b left 3.6v 4 1 red solid 1 analyzer.thd+n ratio b left 5v 0 .1 20 0.2 0.5 1 2 5 10 % 6m 3 10m 20m 50m 100m 200m 500m 1 2 w f igure7 thdn vs p o (r l = 4ohm, f=1khz, gain=2) a udio precision c olor sweep trace line style thick data axis comment 1 1 magenta solid 1 .analyzer.thd+n ratio b left 2.5v 2 1 red solid 1 .analyzer.thd+n ratio b left 3v 3 1 yellow solid 1 .analyzer.thd+n ratio b left 3.6v 4 1 green solid 1 .analyzer.thd+n ratio b left 5v 0 .1 20 0.2 0.5 1 2 5 10 % 5m 1 10m 20m 50m 100m 200m 500m w f igure8 thdn vs p o (r l = 8ohm, f=1khz, gain=2) t ypical performance characteristics leshan radio co ., ltd 7/13
a udio precision c olor sweep trace line style thick data axis comment 1 1 green solid 1 analyzer.thd+n ratio b left po=25mw 2 1 cyan solid 1 analyzer.thd+n ratio b left po=250mw 3 1 yellow solid 1 analyzer.thd+n ratio b left po=1w 0 .0001 100 0.001 0.01 0.1 1 10 % 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure9 thdn vs frequency (v d d = 5v r l = 8ohm gain=2 c i = 2uf) a udio precision c olor sweep trace line style thick data axis comment 1 1 green solid 1 analyzer.thd+n ratio b left 2 1 cyan solid 1 analyzer.thd+n ratio b left 3 1 yellow solid 1 analyzer.thd+n ratio b left 0 .01 10 0.1 1 % 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure10 thdn vs frequency (v d d = 3.6v r l = 8ohm gain=2 c i = 2uf) leshan radio co ., ltd 8/13
a udio precision c olor sweep trace line style thick data axis comment 1 1 green solid 1 analyzer.thd+n ratio b left po=15mw 2 1 cyan solid 1 analyzer.thd+n ratio b left po=75mw 3 1 yellow solid 1 analyzer.thd+n ratio b left po=200mw 0 .01 10 0.1 1 % 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure11 thdn vs frequency (v d d = 2.5v r l = 8ohm gain=2 c i = 2uf) a udio precision c olor sweep trace line style thick data axis comment 1 1 blue solid 1 analyzer.crosstalk b left 5v 2 1 green solid 1 analyzer.crosstalk b left 3.6v 3 1 red solid 1 analyzer.crosstalk b left 2.5v - 120 -40 -100 -80 -60 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure12 psrr vs frequency (r l = 4ohm, input ac-grounded) leshan radio co ., ltd 9/13
a udio precision c olor sweep trace line style thick data axis comment 1 1 cyan solid 1 analyzer.crosstalk b left 5v 2 1 green solid 1 analyzer.crosstalk b left 3.6v 3 1 yellow solid 1 analyzer.crosstalk b left 2.5v - 120 -40 -100 -80 -60 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure13 psrr vs frequency (r l = 8ohm, input ac-grounded) a udio precision c olor sweep trace line style thick data axis comment 1 1 blue solid 1 analyzer.crosstalk b left 5v 2 1 green solid 1 analyzer.crosstalk b left 3.6v 3 1 red solid 1 analyzer.crosstalk b left 2.5v - 120 -40 -100 -80 -60 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz f igure14 psrr vs frequency (r l = 8ohm, input floating) leshan radio co ., ltd 10/13
e fficiency vs po 0 0 .1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.02 0.05 0.1 0.15 0.2 0.25 0.4 0.5 0.6 0.8 1 1.2 p o e fficiency % v dd=5v v dd=2.5 f igure15 gsm power supply rejection vs time (rl=8 ? +33uh) s upply current vs po 0 0 .05 0.1 0.15 0.2 0.25 0.3 0 0.02 0.05 0.1 0.15 0.2 0.25 0.4 0.5 0.6 0.8 1 1.2 p o (w) i dd (a) v dd=5v v dd=2.5v f igure16 supply current vs output power (rl=8 ? +33uh) leshan radio co ., ltd 11/13
a udio precision c olor sweep trace line style thick data axis comment 1 1 cyan solid 1 fft.cha amplitude left 1 2 green solid 1 fft.chb amplitude right - 40m 40m -20m 0 20m v -200m 200m -100m 0 100m v 0 30m 5m 10m 15m 20m 25m s f igure17 gsm power supply rejection vs time a udio precision c olor sweep trace line style thick data axis comment 1 1 cyan solid 1 fft.cha amplitude left 1 2 green solid 1 fft.chb amplitude right - 125 +100 -100 -75 -50 -25 +0 +25 +50 +75 v o ( d b v ) -140 -20 -120 -100 -80 -60 -40 v d d ( d b v ) 0 2k 200 400 600 800 1k 1.2k 1.4k 1.6k 1.8k hz f igure18 gsm power supply rejection vs frequency leshan radio co ., ltd 12/13
p ackage dimensions 9 bump wlcsp dimensions (mm) ref min typ max a 1 0.215 0 .235 0 .255 a 2 0.355 0 .380 0 .405 a 3 0.020 0 .035 0 .050 d 1.485 1 .500 1 .515 d 1 0 .500 e 1.485 1 .500 1 .515 e 1 0 .500 b 0.300 0.320 0.340 c cc 0 .080 leshan radio co ., ltd 13/13

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