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integrated switching (class-d) stereo power amplifier controller ic delivers >10w rms across 8 ? /channel (20w rms stereo) output power limited only by external fets and available supply voltage will drive a wide range of speakers high efficiency (>92%) due to high efficiency, power fets do not require heatsinking audio bandwidth of 20hz to 20khz wide input voltage range of 7v-15v low output signal distortion <1% high operating frequency (350khz) helps to reduce output filter size compact design minimizes emi / rfi the lx1720 is a highly-integrated, switching class-d stereo power am- plifier contr oller ic with power and size features that make it ideal for multi- media computer applications, as well as other applications where high fidelity sound is required. with input voltage ranging from 7v- 15v, the lx1720 is designed to operate over the full 20hz to 20khz audio range. signal distortion measurements using industry standard 1khz signal yields thd + noise levels < 1% (10 watts output).

t he i nfinite p ower of i nnovation lx1720 its high efficiency (>92%) eliminates the need for heat sinks ? even while deliv- ering more than 10w rms across 8 ohms per channel (20w rms stereo) with 0.1 ohm so-8 power fets. the lx1720's output power is limited only by external fets and available sup- ply voltage. while offering breakthrough perfor- mance capabilities for notebooks, the lx1720 is equally attractive for multime- dia systems or to drive full-size home theatre speakers.

1 11861 w estern a venue , g arden g rove , ca. 92841, 714-898-8121, f ax : 714-893-2570 l in f inity m icroelectronics i nc .

notebook computers: replaces existing internal low power linear amplifier with a high efficiency class-d amplifier enables the use of virtually any external speaker without amplification precious battery life is extended fully protected power topology can withstand shorts or external speaker failures without damage, overheating or posing fire hazard desktop computers: output power capability of up to 20w rms per channel in an area less than 3"x3", without using expensive heatsinks greatly reduced power supply requirements when compared to a linear solution of same power capabilities any speakers can be used including conventional home stereo speakers very light weight circuitry will not add to the overall weight of the system multimedia amplifier can be directly incorporated on the motherboard using surface mount components

plastic ssop 44-pin db note: available in tape & reel. append the letter "t" to part number. (i.e. LX1720-01CDBt) 0 seconds efficiency (%) 60 0 5 10 15 20 100 80 40 20 highly integrated linear amplifier linfinity's lx1720 class-d amplifier - average power out for 20sec. approx. 512mw - across 8.6 ohm load audio sample from "hold on tight" b y electric li g ht orchestra

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maximum vdd important: for the most current data, consult linfinity's web site: http://www.linfinity.com. applic a tion note an-11 available on our web site or call 1-800-lmi-7011 not r ec o m m e n ded fo r new d e si g n

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(note 1) supply voltage (pvdd, vdd) ...................................................................... -0.3v to 18v rpwm .................................................................................................... -0.3v to v cn +0.3v input (r), input (l) .......................................................................... -0.3v to v cn +0.3v fbk+(r), fbk-(r), fbk+(l), fbk-(l), sleep .............................................. -0.3v to v dd mute (r), mute (l) .................................................................................... -0.3v to 6.0v eaout (r), eaout (l) ....................................................................... -0.3v to v cn +0.3v cpwm, ct ............................................................................................. -0.3v to v cn +0.3v is+, lis-, ris+ ................................................................................................ v dd -2 to v dd operating junction temperature plastic (db package) ............................................................................................ 125oc storage temperature range ...................................................................... -65c to 150c lead temperature (soldering, 10 seconds) ............................................................ 300c
note 1. exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of the specified terminal. db package: thermal resistance-junction to ambient, ? ? ja 65c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. db package (top view) ! ! ! " " #! # ! # #$ #$ #$ # #$ ## $#% %#$ ## &# '% (%) )%( %' %& %# $ %% % %$ # % & % ' $ ( $) ) $( $' $ $& $ $# $$ $% ! ! ! " " #! # ! # #$ right channel current sense input left channel current sense input positive current sense input pwm resistor connection pwm capacitor connection supply decoupling for nfet drivers oscillator timing capacitor connection oscillator timing resistor bias setting resistor for error amps ground (2-pins) audio input ground right channel input left channel input sleep input inverting input of right channel error amp right channel error amplifier output pin name description

#$ #$ # #$ % %% % % % % % % pin name description output of right feedback amp left channel error amplifier output inverting input of left channel error amp output of left feedback amp right channel feedback inputs supply decoupling for pfet drivers output driver supply voltage (2-pins) analog supply voltage ic power ground for the output drivers (2-pins) right channel gate drive outputs left channel gate drive outputs left channel feedback inputs mute inputs not r ec o m m e n ded fo r new d e si g n

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( unless otherwise specified, the following specifications apply over the operating ambient temperature 0c t a 70c. test conditions: rt = 30k, ct = 100pf, vdd = pvdd = 15v.) parameter symbol test conditions input offset voltage dc open loop gain unity gain bandwidth high output voltage i out = -100a low output voltage i out = +100a input common mode range input bias current oscillator section oscillator frequency oscillator peak voltage oscillator valley voltage oscillator max. frequency voltage stability temperature stability input amplifiers stage gain set by internal resistors input impedance units lx1720 min. typ. max. 280 330 380 khz 2.5 v 200 mv 1mhz 12 % 2% 5mv 60 db 7mhz 4v 50 mv 15v 1a 3.465 3.5 3.535 v/v 42 k ? error amplifiers current limit comparators voltage sense threshold comparator response time 200 220 240 mv 500 nsec pwm comparators cpwm delay to output 250 nsec pwm current generator cpwm charge current rpwm = 75k impedance of internal discharge fet 75 a 20 ? feedback amplifiers high output voltage i out = -250a low output voltage i out = +250a common mode rejection input common mode range input impedance stage gain lx1720-01 set by internal resistors 4v 50 mv 70 db 0v dd v 388 k ? 89 91 93 mv/v output drivers for the n-channel mosfets ext. nfet drivers, low level voltage v ol i sink = 3ma i sink = 75ma ext. nfet drivers, high level voltage v oh i source = 3ma i source = 75ma, cn = 5.2v (applied externally) 30 100 mv 11.5 v 30 100 mv 11.5 v output drivers for the p-channel mosfets ext. pfet drivers, low level voltage v ol i sink = 3ma i sink = 75ma ext. pfet drivers, high level voltage v oh i source = 3ma i source = 75ma, cp = 5.2v (applied externally) 30 100 mv 11.5 v 30 100 mv 11.5 v not r ec o m m e n ded fo r new d e si g n

lx1720

4 (continued) parameter symbol test conditions units lx1720 min. typ. max. undervoltage lockout section start threshold voltage uv lockout hysteresis uvlo delay to output enable 6.3 6.5 6.7 v 500 mv 976 clkcyc supply current sleep current sleep input = 0v, t a = 25c operating current sleep input = 2v, v in = 15v, no mosfets connected sleep to output enable sleep threshold 20 a 57ma 976 clkcyc 1.2 1.45 1.6 v mute section mute threshold 1.6 1.7 1.8 v not r ec o m m e n ded fo r new d e si g n

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figure 1 ? lx1720 block diagram not r ec o m m e n ded fo r new d e si g n

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( () (* + ) ( , - ( ( . - / 0 / - (1 0 , * , / (( * ) 2 ) 0 (- 2 ( - / 0 , * ) 2 , *
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figure 2 ? typical class-d stereo switching amplifier circuit application for detailed application information please refer to application note an-11 available on our web site or call 1-800-lmi-7011 production data - information contained in this document is proprietary to linfinity, and is current as of publication date. t his document may not be modified in any way without the express written consent of linfinity. p roduct processing does not necessarily include testing of all parameters. linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. not r ec o m m e n ded fo r new d e si g n

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