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unisonic technologies co., ltd lm4880 cmos ic www.unisonic.com.tw 1 of 12 copyright ? 2012 unisonic technologies co., ltd. qw-r502-033,c dual 250mw audio power amplifier with shutdown mode ? description the utc lm4880 is a dual audio power amplifier capable of delivering typically 250mw per channel of continuous average power to an 8 ? load with 0.1% thd+n using a 5v power supply. the utc lm4880 features an exte rnally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. the unity-gain stable utc lm4880 can be configured by external gain-setting resistors. ? features * no bootstrap capacitors or snubber circuits are necessary * unity-gain stable * external gain configuration capability ? applications * personal computers * cd-rom players * headphone amplifier ? ordering information ordering number package packing lead free halogen free lm4880l-d08-t lm4880g-d08-t dip-8 tube lm4880l-sh2-r LM4880G-SH2-R hsop-8 tape reel lm4880l-sh2-t lm4880g-sh2-t hsop-8 tube
lm4880 cmos ic unisonic technologies co., ltd 2 of 12 www.unisonic.com.tw qw-r502-033,c ? pin configuration ? pin description pin no pin name i/o description 1 out a o channel a output 2 in a i channel a audio input 3 bypass i connect to internal voltage divider for middle supply bias 4 gnd ground 5 shutdown i shutdown mode control input, high active, place lm4880 into shutdown mode, when held high 6 in b i channel b audio input 7 out b o channel b output 8 v dd supply voltage
lm4880 cmos ic unisonic technologies co., ltd 3 of 12 www.unisonic.com.tw qw-r502-033,c ? absolute maximum ratings (note 2 ) parameter symbol ratings unit supply voltage v dd 6.0 v input voltage v in -0.3 ~ v dd +0.3 v esd susceptibility (note 3) esd 3500 v esd susceptibility (note 4) 250 v power dissipation (note 5) p d internally limited junction temperature t j 150 operating temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 notes: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. absolute maximum ratings indicate limits beyond which damage may occur. operating ratings indicate conditions for which the device is functional, but do not guarantee specific per formance limits. electrical characteristics state dc and ac electr ical specifications under particul ar test conditions which guarantee specific performance limits. this a ssumes that the device is within the operating ratings. specifications are not guaranteed for parameters where no limit is given, however, the ty pical value is a good indication of device performance. 3. human body model, 100 pf discharged through a 1.5 k ? resistor. 4. machine model, 220 pf ~ 240 pf discharged through all pins. 5 . the maximum power dissipation must be derated at elevated temperatures and is dictated by t jmax , ja , and the ambient temperature t a . the maximum allowable power dissipation is p dmax = (t jmax - t a ) / ja or the number given in the absolute maximum ratings , whichever is lower. for the utc lm4880, t jmax = 15 , and the typical junction-to-ambient thermal resistance is 170 /w for sop-8 package and 107 /w for dip-8 package. ? thermal data parameter symbol ratings unit junction to ambient dip-8 ja 107 /w hsop-8 42.3 junction to case dip-8 jc 37 /w hsop-8 12 ? operating ratings parameter symbol ratings unit supply voltage v dd 2.7 ~ 5.5 v temperature range (t min t a t ma x ) t a -40 ~ +85
lm4880 cmos ic unisonic technologies co., ltd 4 of 12 www.unisonic.com.tw qw-r502-033,c ? electrical characteristics (note 1,2) (t a =25 , the following specifications apply for v dd =5v, f=1khz unless otherwise specified) parameter symbol test conditions min typ max unit supply voltage v dd 2.7 5.5 v quiescent power supply current i dd v in =0v, i out =0a 3.6 6.0 ma shutdown current i shdn v pin5 =v dd 0.7 5 a output offset voltage v o ( off ) v in =0v 5 50 mv output power p out thd=0.1%(max), f=1khz r l =8 ? 200 250 mw r l =32 ? 85 mw thd+n=10%, f=1khz r l =8 ? 325 mw r l =32 ? 110 mw total harmonic distortion + noise thd+n r l =8 ? , p out =200mw, f=1khz 0.03 % r l =32 ? , p out =75mw, f=1khz 0.02 % power supply rejection ratio psrr c b =1.0 f, v ripple =200mv rms , f=100hz 50 db notes: 1. all voltages are measured with respec t to the ground pin, unless otherwise specified. 2. absolute maximum ratings indicate limits beyond which damage may occur. operating ratings indicate conditions for which the device is functional, but do not guarantee specific per formance limits. electrical characteristics state dc and ac electr ical specifications under particul ar test conditions which guarantee specific performance limits. this a ssumes that the device is within the operating ratings. specifications are not guaranteed for parameters where no limit is given, however, the ty pical value is a good indication of device performance.
lm4880 cmos ic unisonic technologies co., ltd 5 of 12 www.unisonic.com.tw qw-r502-033,c ? typical application bias + + 1 7 out a out b shutdown bypass in b 6 3 5 2 + + - + - + in a gnd + 4 8 r i 20k ? audio input audio input r i 20k ? v dd /2 50k ? c s 0.1f r f 20k ? + v dd *c o r l 8 ? or 32 ? 50k ? *c o c b 1.0f *ci *c i r f 20k ? fig. 1 typical audio amplifier application circuit 15k ? 15k ? r l 8 ? or 32 ? ? external components description (fig. 1) components functional description 1. r i inverting input resistance which sets the closed-lo op gain in conjunction with rf. this resistor also forms a high pass filter with c i at f c = 1/(2 r i c i ). 2. c i input coupling capacitor which blocks the dc volt age at the amplifier?s input terminals. also creates a high pass filter with r i at f c = 1/(2 r i c i ). 3. r f feedback resistance which sets closed-loop gain in conjunction with r i . 4. c s supply bypass capacitor which prov ides power supply filtering. 5. c b bypass pin capacitor which provides half-supply filtering. 6. c o output coupling capacitor which blocks the dc volt age at the amplifier?s output. forms a high pass filter with r l at f o = 1/(2 r l c o ).
lm4880 cmos ic unisonic technologies co., ltd 6 of 12 www.unisonic.com.tw qw-r502-033,c ? automatic shutdown circuit + headphone jack + 20k 0.33f v dd v dd 100f to channel b output(pin 7) via coupling capacitor fig. 2 automatic shutdown circuit r p 1m 1k r o audio input + - 20k + 3 2 4 5 1 8 0.1f 100k r sd utc lm4880 1f ? automatic switching circuit + + v dd 100 f + - 1 8 7 2 3 6 5 + fig. 3 automatic switching circuit 0.33f 20k + r l 8 v dd 0.1 f 20k r p 1m 1k r o headphone jack to utc lm4880 channel b output (pin 7) via coupling capacitor 20k lm4861 4 audio input 1f 0.33f + - 20k + 3 2 4 5 1 8 0.1f 100k r sd utc lm4880 1f v dd
lm4880 cmos ic unisonic technologies co., ltd 7 of 12 www.unisonic.com.tw qw-r502-033,c ? typical characteristics
lm4880 cmos ic unisonic technologies co., ltd 8 of 12 www.unisonic.com.tw qw-r502-033,c ? typical characteristics(cont.) thd+n (%) thd+n (%) thd+n (%) thd+n (%) output power (mw) output power (mw)
lm4880 cmos ic unisonic technologies co., ltd 9 of 12 www.unisonic.com.tw qw-r502-033,c ? typical characteristics(cont.)
lm4880 cmos ic unisonic technologies co., ltd 10 of 12 www.unisonic.com.tw qw-r502-033,c ? typical characteristics(cont.) 20 -140.0 0.0 output level (db) frequency (hz) 100 10k 20k channel separation channel b to a 1k -120.0 -100.0 -80.00 -60.00 -40.00 -20.00 channel a to b 20 100.0 0.0 frequency (hz) 100 10k 20k output attenuatin in shutdown mode 1k 90.00 80.00 70.00 60.00 40.00 20.00 output attenuation (db) 50.00 30.00 10.00 r i =r f =20k 20 frequency (hz) 100 10k 20k noise floor 1k 1m power supply rejection ratio 10 100 1k 10k 0 10 20 30 40 50 60 70 psrr (db) 100k frequency (hz) open loop frequency response 10 100 1k 10k 100k 1m 0 20 40 60 80 100 gain (db) 10m frequency (hz) 100m 0 45 90 135 180 225 phase (o) supply current vs supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 supply current (ma) supply voltage (v) 5.5 4.5 5.0 0db=1.3vrms r f =20k 100 10 1 bw<22khz c b = 1 . 0 f i i w 0 . 1 f c b =0.1f v pin3 =2.5v(forced) c b = 1 . 0 f i i 0 . 1 f v pin5 =0v r l = noise floor ( v) r i =r f =10k r i =10k v dd =5.0v r l =8 v pin3 =5.0v r l =8 p out =200mw 0db=200mw g v =1 c b =1.0f r l =8 g v =1 gain phase v ripple =200mv rms 0db=200mv rms v dd =5.0v r l =8
lm4880 cmos ic unisonic technologies co., ltd 11 of 12 www.unisonic.com.tw qw-r502-033,c ? typical characteristics(cont.) frequency response vs. output capacitor size -20.00 -15.00 -10.00 -5.000 0.0 5.0000 20 100 10k 100k 1k frequency (hz) frequency response vs. output capacitor size -20.00 -15.00 -10.00 -5.000 0.0 5.0000 20 100 10k 100k 1k frequency (hz) frequency response vs input capacitor size -20.00 -15.00 -10.00 -5.000 0.0 5.0000 20 100 10k 100k 1k frequency (hz) typical application frequency response -20.00 -15.00 -10.00 -5.000 0.0 5.0000 20 100 10k 100k 1k frequency (hz) i typical application frequency response -20.00 -15.00 -10.00 -5.000 0.0 5.0000 20 100 10k 100k 1k frequency (hz) r i =20k , r l =8 g v =-1, c i =10f c o =220f c o =470f c o =1000f c o =2200f c o =47f c o =100f c o =220f c o =470f c i =0.1f c i =0.22f c i =0.47f c i =1.0f c i =0.1f c o =470f c i =1.0f c o =470f c o =220f c i =0.1f c o =220f c i =1.0f r i =20k , r l =32 g v =-1, c i =10f g v =-1 r i =20k r l =32 g v =-1 r i =20k r l =8 g v =-1 r i =20k c out =10000f r l =8
lm4880 cmos ic unisonic technologies co., ltd 12 of 12 www.unisonic.com.tw qw-r502-033,c utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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