19-6541; rev 0; 12/12 functional diagrams ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/max44281.related . general description the max44281 is the industrys first op amp in a 4-bump wlp package, designed for use in portable consumer and medical applications. this device is offered as a noninverting amplifier with gain (a v ) of +1v/v, +2v/v, or +10v/v. the device features rail-to-rail output, low 100v input voltage offset, and 15mhz of bandwidth with only 700a of supply current. the device features shutdown functionality by pulling v dd to ground. during shutdown, both the input and the output are high impedance. the device is available in an ultra-small, 0.86mm x 0.86mm, 4-bump wlp package with 0.5mm height. it is specified over the -40c to +125c temperature range. applications benefits and features s 0.86mm x 0.86mm 4-bump thin wlp package s low 100v input offset voltage s rail-to-rail output s 15mhz gbw with only 700a supply current s shutdown input through v dd s ultra-low 10pa input bias current s 1.8v to 5.5v wide supply range s three gain versions available ? 1v/v (max44281o) ? 2v/v (max44281v) ? 10v/v (max44281u) 3g/4g handsets sensor interfaces portable medical devices battery-powered devices general-purpose signal processing notebooks transimpedance amplifiers out in v dd gnd max44281o r out in v dd r gnd max44281v 9r out in v dd r gnd max44281u max44281 ultra-small, ultra-thin, 4-bump op amp evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.
2 absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . package thermal characteristics (note 1) electrical characteristics (v dd = 3.3v, v gnd = 0v, r l = 10k i to v dd /2, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 n c.) (note 1) v dd to gnd ............................................................ -0.3v to +6v in to gnd..... ........................................................... -0.3v to +6v out to gnd .............................. (v gnd - 0.3v) to (v dd + 0.3v) continuous power dissipation (t a = +70 n c) wlp (derate 9.7mw/ n c above +70 n c) ........................ 303mw maximum continuous current into any pin ................... p 20ma operating temperature range ........................ -40 n c to +125 n c storage temperature range ............................ -65 n c to +150 n c soldering temperature (reflow) ...................................... +260 n c wlp junction-to-ambient thermal resistance ( q ja ) ........ 103c/w parameter symbol conditions min typ max units dc performance (note 1) input voltage range (note 3) v in a v = 1v/v (max44281o) 0.1 v dd - 0.1 v a v = 2v/v (max44281v) 0.05 (v dd - 0.1)/2 a v = 10v/v (max44281u) 0.01 (v dd - 0.1)/10 gain error ge a v = 1v/v (max44281o) 0.01 0.02 % a v = 2v/v (max44281v) 0.2 0.6 a v = 10v/v (max44281u) 0.3 0.7 input offset voltage (note 2) v os v in = 150mv, no load a v = 1 20 100 f v a v = 2v/v 20 100 a v = 10v/v 20 100 input offset voltage drift (note 2) v os - tc 2 9 f v/ n c input bias current (note 2) i b t a = +25 n c (note 2) 1 10 pa t a = -40 n c to +125 n c 2000 output short-circuit current i sc out to v dd or gnd 50 ma output voltage low v ol r out = 10k i 0.02 v r out = 600 i 0.1 maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
3 electrical characteristics (continued) (v dd = 3.3v, v gnd = 0v, r l = 10k i to v dd /2, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 n c.) (note 1) note 1: all devices are 100% production tested at t a = +25c. specifications over temperature limits are guaranteed by design. note 2: guaranteed by design. note 3: guaranteed by gain accuracy specifications. parameter symbol conditions min typ max units output voltage high v oh r out = 10k i v dd C 0.1 v r out = 600 i v dd C 0.1 input voltage-noise density e n a v = 1v/v, f = 10khz 15 nv/ hz a v = 2v/v, f = 10khz 19 a v = 10v/v, f = 10khz 16 gain bandwidth gbw 15 mhz slew rate sr 8 v/ f s capacitive load c load no sustained oscillations 100 pf power-supply characteristics power-supply range v dd guaranteed by psrr t a = -40 n c to +125 n c 1.8 5.5 v t a = 0 n c to +70 n c 1.7 5.5 power-supply rejection ratio psrr 75 100 db supply current i cc v out = v dd /2, no load 700 1200 f a shutdown supply current i shdn 1 f a shutdown threshold v il 0.5 v turn-on time t on t a = +25 n c 10 20 ms t a = -40 n c to +125 n c 10 30 maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
4 typical operating characteristics (t a = +25c, unless otherwise noted.) gain and phase vs. frequency (no load) max44281 toc01a frequency (khz) gain (db)/phase (degrees) 100 1 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 -200 0.01 10,000 max44281o gain phase gain and phase vs. frequency (no load) max44281 toc01b frequency (khz) gain (db)/phase (degrees) 100 1 -150 -100 -50 0 50 -200 0.01 10,000 max44281v gain phase gain and phase vs. frequency (no load) max44281 toc01c frequency (khz) gain (db)/phase (degrees) 100 1 -150 -100 -50 0 50 -200 0.01 10,000 max44281u gain phase gain and phase vs. frequency (c l = 100pf) max44281 toc02a frequency (khz) gain (db)/phase (degrees) 100 1 -150 -100 -50 0 50 -200 0.01 10,000 max44281o gain phase power-supply rejection ratio vs. frequency max44281 toc03 frequency (khz) psrr (db) 100 1 -100 -80 -60 -40 -20 0 -120 0.01 10,000 gain and phase vs. frequency (c l = 100pf) max44281 toc02b frequency (khz) gain (db)/phase (degrees) 100 1 -150 -100 -50 0 50 -200 0.01 10,000 max44281v gain phase output impedance vs. frequency max44281 toc04 frequency (khz) output impedance ( i ) 10,000 100 1 1 10 100 1000 0.1 0.01 gain and phase vs. frequency (c l = 100pf) max44281 toc02c frequency (khz) gain (db)/phase (degrees) 100 1 -150 -100 -50 0 50 -200 0.01 10,000 max44281u gain phase input-referred voltage-noise density vs. frequency max44281 toc05 frequency (khz) 10 1 0.1 10 100 1000 1 0.01 100 input-referred voltage-noise density (nv/hz) max44281o v out = v dd /2 maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
5 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) input-referred voltage-noise density vs. frequency max44281 toc06 frequency (khz) 10 1 0.1 10 100 1000 1 0.01 100 input-referred voltage-noise density (nv/hz) max44281v v out = v dd /2 input-referred voltage-noise density vs. frequency max44281 toc07 frequency (khz) 10 1 0.1 10 100 1000 1 0.01 100 input-referred voltage-noise density (nv/hz) max44281u v out = v dd /2 supply current vs. temperature max44281 toc08 temperature (c) supply current (a) 60 10 100 200 300 400 500 600 700 800 0 -40 110 v in = v dd /2 no load supply current vs. supply voltage max44281 toc09 supply voltage (v) supply current (a) 100 200 300 400 500 600 700 800 0 01 23 45 v in = v dd /2 no load input offset voltage vs. temperature max44281 toc12 temperature (c) input offset voltage (v) 110 60 10 -80 -60 -40 -20 0 20 40 60 80 100 -100 -40 v in = 150mv no load gain accuracy vs. input voltage max44281 toc10 input voltage (v) gain accuracy (%) 3 2 1 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050 0 0 no load max44281o input bias current vs. temperature max44281 toc13 temperature (c) input bias current (pa) 110 60 10 500 1000 1500 2000 2500 0 -40 v in = v dd /2 noload gain accuracy vs. temperature max44281 toc11 temperature (c) gain accuracy (%) 110 60 10 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0 -40 no load input bias current vs. input voltage max44281 toc14 input voltage (v) input bias current (pa) 3.1 2.1 1.1 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 0.1 no load max44281o maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
6 typical operating characteristics (t a = +25c, unless otherwise noted.) output voltage swing high vs. temperature max44281 toc15 temperature (c) output voltage swing high (v) 110 60 10 3.291 3.292 3.293 3.294 3.295 3.296 3.297 3.298 3.299 3.300 3.290 -40 capacitive-load stability vs. resistive load max44281 toc18 resistive load ( i ) capacitive load (pf) 10k 1k 50 100 150 200 250 300 350 400 0 100 100k unstable region stable region max44281 toc21 1s / div input 500mv/div v cc /2 output 500mv/div v cc /2 large-signal step response vs. time output voltage swing low vs. temperature max44281 toc16 temperature (c) output voltage swing low (v) 110 60 10 0 -40 0.002 0.004 0.006 0.008 0.010 isolation resistance vs. capacitive-load stability max44281 toc19 load capacitance (pf) isolation resistance ( ) 1500 1000 500 2 4 6 8 10 12 14 0 0 2000 stable region unstable region input offset voltage vs. temperature max44281 toc22 c load (pf) overshoot (%) 10 20 30 40 50 60 70 80 90 100 0 0 600 500 400 300 200 100 v in = 100mv p-p positive overshoot negative overshoot minimum operating voltage vs. temperature max44281 toc17 temperature (c) supply voltage (v) 110 60 10 1.0 -40 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 max44281 toc20 1s / div input 50mv/div v cc /2 output 50mv/div v cc /2 small-signal step response vs. time maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
7 bump description bump configuration bump name function a1 in input a2 v dd positive supply voltage b1 gnd ground b2 out output a b 12 in v dd gnd out + top view (bumps on bottom) wlp max44281 maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
8 detailed description rail-to-rail output stage the max44281 is a high-bandwidth, low-power op amp in the smallest 4-bump wlp industry package. its combination of precision, low-noise, and low-power specifications makes it ideal for use in a wide variety of sensor interface applications in portable consumer and medical equipment. shutdown mode the max44281 features shutdown functionality by pulling v dd to ground. during shutdown, both the input and the output are high-impedance. the input and output of the max44281 enter a high-impedance state when the device enters shutdown. since shutdown is triggered by lowering the supply voltage to below 0.5v, the esd protection diodes at the output limit the high-z voltage range of the output. diode d2 in figure 2, from the output of the amplifier to v dd , is forward biased when the output voltage becomes too high in shutdown mode. the diodes combined with the low-voltage shutdown functionality effectively limit the high-impedance output range to plus and minus a diode voltage around ground (~ p 0.6v). driving capacitive loads driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. the max44281 is stable for a range of capacitive loads to above 400pf. adding a series resistor between the output and the load capacitor improves the circuits response by isolating the load capacitance from the op amps output. see the isolation resistance vs. capacitive-load stability graph in the typical operating characteristics section for details. applications information the max44281 features low input voltage offset and low bias current, which makes the device ideal for single- supply dc operations. however, its wide bandwidth and low noise make it suitable also for ac applications. the circuit in figure 1 enables ac-coupled applications with the simple addition of two external resistors r1 and r2. such resistors set the output bias voltage at midsupply. the values of r1 and r2 depend on the gain option of the device, according to the equation: v dd x (r2/(r1 + r2)) = v dd /(2 x a v ) driver for interfacing with the max11645 adc the max44281s tiny size and low noise make it a good fit for driving 12- to 16-bit resolution adcs in space-constrained applications. the typical application circuit shows the max44281 amplifier output connected to a lowpass filter driving the max11645 adc. the max11645 is part of a family of 3v and 5v, 12-bit and 10-bit, 2-channel adcs. the max11645 offers sample rates up to 94ksps and measures two single-ended inputs or one differential input. these adcs dissipate 670 f a at the maximum sampling rate, but just 6 f a at 1ksps and 0.5 f a in shut- down. offered in the ultra-tiny, 1.9mm x 2.2mm wlp and f max-8 packages, the max11645 adcs are an ideal fit to pair with the max44281 amplifier in por table applications. where higher resolution is required, refer to the max1069 (14-bit) and max1169 (16-bit) adc families. figure 1. how to use the max44281 in ac-coupled applications figure 2. output esd protection diodes d2 v dd out d1 gnd out v out in r1 r2 c v dd v in v dd gnd max44281 maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
9 typical application circuit wlp applications information for the latest application details on wlp construction, dimensions, tape carrier information, pcb techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability test- ing results, refer to application note 1891: wafer-level packaging (wlp) and its applications . ordering information package information for the latest package outline information and land patterns (foot - prints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. + denotes a lead(pb)-free/rohs-compliant package. * future productcontact factory for availability. package type package code outline no. land pattern no. 4 wlp n40a0-1 21-0612 refer to application note 1891 part temp range pin- package function max44281oans+t* -40 n c to +125 n c 4 wlp noninverting, a v = 1v/v max44281vans+t -40 n c to +125 n c 4 wlp noninverting, a v = 2v/v max44281uans+t -40 n c to +125 n c 4 wlp noninverting, a v = 10v/v 22ki 10ki 2.4ki adc max11645 3.3nf max44281 +5v 330pf sallen-key filter corner frequency = 10khz 15nf maxim integrated max44281 ultra-small, ultra-thin, 4-bump op amp
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 10 ? 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 12/12 initial release max44281 ultra-small, ultra-thin, 4-bump op amp
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