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general description the MAX4369 dual, high-output-drive op amp combines single-supply operation with high-output-current drive, rail-to-rail outputs in an ultra chip-scale package (ucsp). the device is unity-gain stable to 3.5mhz and operates from a single 2.3v to 5.5v supply. the MAX4369 is guaranteed to source and sink up to 87ma with a 5v supply. the MAX4369 is capable of delivering 120mw of con- tinuous average power to a 16 ? load, or 75mw to a 32 ? load with 1% total harmonic distortion plus noise (thd + n), making the device ideal for portable audio applications. the MAX4369 is specified over the extended tempera- ture range (-40? to +85?) and is available in a tiny (1.5mm x 1.5mm) 9-bump ucsp. applications features tiny ucsp (1.5mm x 1.5mm) drives 120mw into 16 ? 0.03% thd + n at 1khz 2.3v to 5.5v single-supply operation 1ma supply current per amplifier very high power-supply rejection ratio (96db) unity-gain stable rail-to-rail output stage thermal overload and short-circuit protection MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp ________________________________________________________________ maxim integrated products 1 ordering information ina- outa outb ina+ inb+ inb- MAX4369 c out c out r f r f v cc r1 r2 c in c in c bias v bias left audio input right audio input r in r in typical application circuit/functional diagram 19-2407; rev 0; 4/02 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. bump configuration appears at end of data sheet. rail-to-rail is a registered trademark of nippon motorola, ltd. ucsp is a trademark of maxim integrated products, inc. part temp range bump- package top mark MAX4369ebl-t -40? to +85? 9 ucsp-9 aan cellular phones headphones headsets pdas dc motor control general-purpose audio
MAX4369 dual, high-output-drive, ucsp, rail-to-rail output op amp 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = 5v, v cm = 0, v out = v cc /2, r l = connected to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 3) stresses beyond those listed under ?bsolute 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 conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ..............................................................-0.3v to +6v all other pins to gnd.................................-0.3v to (v cc + 0.3v) output short circuit to v cc or gnd (note 1).............continuous continuous power dissipation (t a = +70?) 9-bump uscp (derate 4.7mw/? above +70?)..........379mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? bump temperature (soldering) (note 2) infrared (15s) ................................................................+220? vapor phase (60s) ........................................................+215? parameter symbol conditions min typ max units supply voltage range v cc inferred from psrr test 2.3 5.5 v supply current per amplifier i cc 1 2.2 ma input offset voltage v os 0.35 5mv r l = 10k ? 88 open-loop voltage gain a v 0.6v v out v cc - 0.6v r l = 32 ? 80 84 db input bias current i b 0.2 3 a input offset current i os 0.01 0.3 a input common-mode range v cm inferred from cmrr test 0 v cc - 1.0 v differential input resistance r in ( diff ) v in+ - v in- = 10mv 500 k ? power-supply rejection ratio psrr 2.3v v cc 5.5v 80 96 db common-mode rejection ratio cmrr 0 v cm v cc - 1.0v 70 80 db 2.7v v cc 5.5v, 0.6v v out v cc - 0.6v 87 125 output source/sink current i out 2.3v v cc 2.7v, 0.6v v out v cc - 0.6v 115 ma v cc - v oh 300 r l = 10k ? v ol 15 v cc - v oh 330 600 r l = 32 ? v ol 180 600 v cc - v oh 350 output voltage swing v out 2.7v v cc 5.5v r l = 16 ? v ol 310 mv r l = 16 ? 120 output power p out th d + n = 1%, f = 1kh z ( n ote 4) r l = 32 ? 56 75 mw p out = 100mw, r l = 16 ? 0.05 total harmonic distortion plus noise thd + n f = 1khz ( n ote 5) p out = 65mw, r l = 32 ? 0.03 % unity-gain bandwidth bw 3.5 mhz gain-bandwidth product gbwp 3.5 mhz note 1: continuous power dissipation must also be observed. note 2: this device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile that the device can be exposed to during board-level solder attach and rework. this limit permits only the use of the solder profiles recommended in the industry standard specification, jedec 020a, paragraph 7.6, table 3 for ir/vpr and convection reflow. preheating is required. hand or wave soldering is not allowed.
MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp _______________________________________________________________________________________ 3 note 3: all specifications are 100% tested at t a = +25 c; temperature limits are guaranteed by design. note 4: guaranteed by design. not production tested. note 5: measurement bandwidth is 22hz to 22khz. electrical characteristics (continued) (v cc = 5v, v cm = 0, v out = v cc /2, r l = connected to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 3) parameter symbol conditions min typ max units full-power bandwidth fpbw 25 khz phase margin pm 73 degrees gain margin gm 27 db crosstalk 90 db signal-to-noise ratio snr v out = 1.5v rms , a v = 1v/v (note 5) 100 db slew rate sr 1 v/s settling time t s settling to 0.1% 10 s input capacitance c in 1pf input-voltage noise density e n f = 1khz 40 nv/ hz input-current noise density i n f = 1khz 1.5 pa/ hz capacitive-load stability a v = -1v/v, no sustained oscillations 200 pf to v cc 185 short-circuit current i sc to gnd 215 ma thermal shutdown threshold 165 c thermal shutdown hysteresis 10 c power-up time t pu 25 s typical operating characteristics (thd + n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) -180 -160 -120 -140 -100 -80 -60 -40 -20 0 20 60 40 80 gain and phase vs. frequency frequency (hz) 100 100k 1m 10m 1k 10k 100m gain (db)/phase (degrees) MAX4369 toc01 v cc = 5v a v = 1000v/v -180 -160 -120 -140 -100 -80 -60 -40 -20 0 20 60 40 80 gain and phase vs. frequency frequency (hz) 100 100k 1m 10m 1k 10k 100m gain (db)/phase (degees) MAX4369 toc02 v cc = 5v a v = 1000v/v c l = 200pf 0 -20 -40 -60 -80 -100 -120 10 1k 10k 100k 100 1m power-supply rejection ratio vs. frequency MAX4369 toc03 frequency (hz) psrr (db) v cc = 5v
MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp 4 _______________________________________________________________________________________ typical operating characteristics (continued) (thd + n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) 0 -20 -40 -60 -80 -100 -120 10 1k 10k 100k 100 1m power-supply rejection ratio vs. frequency MAX4369 toc04 frequency (hz) psrr (db) v cc = 3v 10k 100k -100 -90 -80 -70 -50 -60 -40 10 100 1k crosstalk vs. frequency MAX4369 toc05 frequency (hz) crosstalk (db) v cc = 5v v inb = 1.5v rms outb to outa 10k 100k -100 -90 -80 -70 -50 -60 -40 10 100 1k crosstalk vs. frequency MAX4369 toc06 frequency (hz) crosstalk (db) v cc = 5v v inb = 1.5v rms outa to outb supply current per amplifier vs. temperature MAX4369 toc07 temperature ( c) supply current (ma) 60 35 10 -15 0.25 0.50 0.75 1.00 1.25 1.50 0 -40 85 v cc = 5v v cc = 3v offset voltage vs. temperature MAX4369 toc08 temperature ( c) offset voltage ( v) 60 35 10 -15 100 200 300 400 500 600 0 -40 85 v cc = 5v v cc = 3v output high voltage vs. temperature MAX4369 toc09 temperature ( c) output high voltage (mv) 60 35 10 -15 100 200 300 400 500 0 -40 85 r l = 10k ? v oh = v cc - v out v cc = 5v v cc = 3v output low voltage vs. temperature MAX4369 toc10 temperature ( c) output low voltage (mv) 60 35 10 -15 5 10 15 20 25 0 -40 85 r l = 10k ? v cc = 5v v cc = 3v minimum operating voltage vs. temperature MAX4369 toc11 temperature ( c) supply voltage (v) 60 35 10 -15 1 2 3 4 5 0 -40 85 large-signal gain vs. output sink current MAX4369 toc12 output sink current (ma) large-signal gain (db) 75 50 25 20 40 60 80 100 120 140 0 0 100 v cc = 5v v cc = 3v
MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp large-signal gain vs. output source current MAX4369 toc13 output source current (ma) large-signal gain (db) 75 50 25 20 40 60 80 100 120 140 0 0 100 v cc = 5v v cc = 3v total harmonic distortion plus noise vs. frequency MAX4369 toc14 frequency (khz) thd + n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 v cc = 5v p out = 30mw r l = 32 ? r l = 16 ? total harmonic distortion plus noise vs. frequency MAX4369 toc15 frequency (khz) thd + n (%) 10 1 0.1 0.1 1 10 0.01 0.01 100 v cc = 3v p out = 10mw r l = 32 ? r l = 16 ? total harmonic distortion plus noise vs. output power MAX4369 toc16 output power (mw) thd + n (%) 120 100 80 60 40 20 0.1 1 10 100 0.01 0 140 v cc = 5v r l = 16 ? f in = 10khz f in = 20hz f in = 1khz total harmonic distortion plus noise vs. output power MAX4369 toc17 output power (mw) thd + n (%) 50 40 30 20 10 0.1 1 10 100 0.01 060 v cc = 3v r l = 16 ? f in = 10khz f in = 20hz f in = 1khz total harmonic distortion plus noise vs. output power MAX4369 toc18 output power (mw) thd + n (%) 80 60 20 40 0.1 1 10 100 0.01 0 100 v cc = 5v r l = 32 ? f in = 20hz f in = 10khz f in = 1khz total harmonic distortion plus noise vs. output power MAX4369 toc19 output power (mw) thd + n (%) 30 20 10 0.1 1 10 100 0.01 040 v cc = 3v r l = 32 ? f in = 20hz f in = 10khz f in = 1khz typical operating characteristics (continued) (thd + n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) output power vs. supply voltage MAX4369 toc20 supply voltage (v) output power (mw) 4.7 3.9 3.1 20 40 60 80 100 120 140 160 180 200 0 2.3 5.5 f in = 1khz r l = 16 ? thd + n = 10% thd + n = 1% _______________________________________________________________________________________ 5 output power vs. supply voltage MAX4369 toc21 supply voltage (v) output power (mw) 4.7 3.9 3.1 20 40 60 80 100 120 140 0 2.3 5.5 f in = 1khz r l = 32 ? thd + n = 10% thd + n = 1%
MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp 6 _______________________________________________________________________________________ typical operating characteristics (continued) (thd + n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) small-signal transient response (noninverting) MAX4369 toc22 v cc = 5v a v = 1v/v r l = 10k ? 10 s/div in_ out_ 50mv/div 50mv/div small-signal transient response (inverting) MAX4369 toc23 v cc = 5v a v = -1v/v r l = 10k ? 10 s/div in_ out_ 50mv/div 50mv/div large-signal transient response (noninverting) MAX4369 toc24 v cc = 5v a v = 1v/v r l = 10k ? 10 s/div in_ out_ 1v/div 1v/div large-signal transient response (inverting) MAX4369 toc25 v cc = 5v a v = -1v/v r l = 10k ? 10 s/div in_ out_ 1v/div 1v/div
detailed description rail-to-rail output the MAX4369 can drive a 10k ? load and still swing within 300mv of the positive-supply rail, and 15mv of the negative-supply rail. figure 1 shows the output volt- age swing of the MAX4369 configured with a v = 2v/v. driving capacitive loads driving a capacitive load can cause instability in many op amps. the MAX4369 is unity-gain stable for a range of capacitive loads to 200pf. figure 2 shows the response of the MAX4369 with an excessive capacitive load. adding a series resistor between the output and the output capacitor improves the circuit s response by isolating the load capacitance from the op amp s output. applications information power dissipation under normal operating conditions, linear power ampli- fiers like the MAX4369 can dissipate a significant amount of power. the maximum power dissipation of the ucsp package is given in the absolute maximum ratings section under continuous power dissipation or can be calculated by the following equation: where t j(max) is +150 c and ja is the reciprocal of the derating factor in c/w as specified in the absolute maximum ratings . for example, ja of a ucsp pack- age is 211 c/w. if the power dissipation exceeds the maximum allowed for a given package, either reduce v cc , increase load impedance, decrease the ambient temperature or add heat sinking to the device. large output, supply, and ground traces improve the maximum power dissipation in the package. thermal overload protection limits total power dissipa- tion in the MAX4369. when the junction temperature exceeds +165 c, the thermal protection circuitry dis- ables the amplifier output stage. the amplifiers are enabled once the junction temperature cools by 10 c. this results in a pulsing output under continuous ther- mal overload conditions. p tt diss max j max a ja () () = ? MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp 400 s/div out_ 5v gnd v cc = 5v r l = 10k ? figure 1. rail-to-rail output operation 4 s/div out_ 100mv/div 200mv/div a v = 2v/v v cc = 5v c load = 1nf in_ figure 2. small-signal transient response with excessive capacitive load bump name function a1 ina- amplifier a inverting input a2 outa amplifier a output a3 ina+ amplifier a noninverting input b1 gnd ground b2 not populated b3 v cc power supply c1 inb- amplifier b inverting input c2 outb amplifier b output c3 inb+ amplifier b noninverting input bump description ________________________________________________________________________________________ 7
supply bypassing proper supply bypassing ensures low-noise, low-distor- tion performance. place a 0.1f ceramic capacitor in par- allel with a 10f capacitor from v cc to gnd. locate the bypass capacitors as close to the device as possible. layout considerations good layout improves performance by decreasing the amount of stray capacitance and noise at the amplifi- er s inputs and outputs. decrease stray capacitance by minimizing pc board trace lengths, using surface- mount components and placing external components as close to the device as possible. ucsp considerations for general ucsp information and pc layout considera- tions, please refer to the maxim application note: wafer-level ultra-chip-scale package . audio applications single-ended stereo amplifier the high-output-current drive makes the MAX4369 ideal for use as a stereo audio amplifier (see typical application circuit/functional diagram ). in this configu- ration, the MAX4369 can deliver 120mw per channel into 16 ? with less than 1% thd + n. the input capaci- tors (c in ) block the dc component of the incoming audio signal from the MAX4369. see the input capacitor section for selecting the value of c in . the output capaci- tors (c out ) serve to block the dc bias of the MAX4369 from the speaker load. see the output capacitor section for selecting the value of c out . set the dc bias (typical- ly v cc /2) by the resistive voltage-divider formed by r1 and r2. ensure that the dc-bias level gives the incoming audio signal the maximum amount of headroom. c out can be eliminated by operating the MAX4369 from a dual supply ( 1.15v to 2.5v) and setting the dc bias to 0. differential input/differential output audio amplifier the MAX4369 can be used as a differential input/differ- ential output (btl) amplifier (figure 3). this configura- tion offers good cmrr, improved low-frequency psrr, no large output-coupling capacitors compared to a sin- gle-ended amplifier. resistors r inb and r fb configure the second amplifier as an inverting unity-gain follower. connect the noninverting input of the second amplifier to a bias voltage, typically v cc /2. resistors r in and r f set the differential gain of the device as follows: v v r r out diff in diff f in () () = MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp 8 _______________________________________________________________________________________ inb+ outb outa ina+ ina- MAX4369 r f 10k ? r f 10k ? c f 10opf v cc c in 1 f negative audio input positive audio input inb- r in 10k ? r in 10k ? c2 c1 a2 c3 a3 a1 r fb 10k ? r inb 10k ? c f 100pf 1 f 50k ? 50k ? c in 1 f figure 3. differential input/differential output audio amplifier
the capacitors (c f ) are necessary to maintain stability. the amplifier has two feedback paths, one from outa to ina- and the other from outb to ina+. at high fre- quencies, the second amplifier in the outb to ina+ feedback path introduces excessive phase shift. compensate this phase shift by adding a capacitor from ina+ to gnd. this suppresses the gain of the device at high frequencies, maintaining stability. placing an identical-valued capacitor from ina- to outa improves overall performance. proper matching of the r f and r in components is essen- tial for optimum performance. a resistor pack offers a cost-effective solution for these matched components. headphone driver the MAX4369 can drive a stereo headphone when con- figured as a single-ended stereo amplifier. typical 3- wire headphone plugs consist of a tip, ring, and sleeve. the tip and ring are the signal carriers while the sleeve is the ground connection (figure 4). figure 5 shows the MAX4369 configured to drive a set of headphones. outb is coupled to the ring and outa is coupled to the tip, delivering the signal to the headphone. capacitor selection input capacitor the input capacitor (c in ), in conjunction with r in , forms a high-pass filter that removes the dc bias from an incoming signal (see the typical application circuit/ functional diagram ). the ac-coupling capacitor allows the amplifier to bias the signal to an optimum dc level. assuming zero-source impedance, the -3db point of the high-pass filter is given by: choose c in such that f -3db is well below the lowest fre- quency of interest. setting f -3db too high affects the low-frequency response of the amplifier. use capaci- tors whose dielectrics have low-voltage coefficients, fdb in in rc ? = 3 1 2 MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp _______________________________________________________________________________________ 9 tip (left) sleeve (gnd) ring (right) figure 4. typical 3-wire headphone jack figure 5. stereo headphone driver ina+ c out c out r f r f v cc r1 r2 c in r in r in c in c bias v bias left audio input right audio input headphone jack ina- outa outb inb+ inb- MAX4369
such as tantalum or aluminum electrolytic. capacitors with high-voltage coefficients, such as certain ceram- ics, can result in an increase in distortion at low fre- quencies. other considerations when designing the input filter include the constraints of the overall system, the actual frequency band of interest and click-and-pop suppres- sion. although high-fidelity audio calls for a flat gain response between 20hz and 20khz, portable voice- reproduction devices such as cellular phones and walkie-talkies need only concentrate on the frequency range of the spoken human voice (typically 300hz to 3.5khz). in addition, speakers used in portable devices typically have a poor response below 150hz. taking these two factors into consideration, the input filter might not need to be designed for a 20hz to 20khz response, saving both board space and cost due to the use of smaller capacitors. output-coupling capacitor the MAX4369 requires an output-coupling capacitor when configured as a single-ended amplifier. the out- put capacitor blocks the dc component of the amplifier output, preventing dc current flowing to the load. the output capacitor and the load impedance form a high- pass filter with the -3db point determined by: as with the input capacitor, choose c out such that f -3db is well below the lowest frequency of interest. setting f -3db too high affects the low-frequency response of the amplifier. in addition to frequency band considerations, the load impedance is another concern when choosing c out . load impedance can vary, changing the -3db point of the output filter. a lower impedance increases the cor- ner frequency, degrading low-frequency response. select c out such that the worst-case load/c out com- bination yields an adequate response. chip information transistor count: 669 process: bipolar fdb l out rc ? = 3 1 2 MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp 10 ______________________________________________________________________________________ bump configuration ina- a b c 123 outa ina+ gnd v cc inb- outb inb+ MAX4369 top view (bump side down) ucsp pkg code: b9-2 b2 position is not populated ucsp
MAX4369 dual, rail-to-rail, high-output-drive op amp in ucsp maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)

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