general description the max44264 is an ultra-small (6-bump wlp) op ampthat draws only 750na of supply current. it operates from a single +1.8v to +5.5v supply and features ground-sensing inputs and rail-to-rail output. the ultra- low supply current, low-operating voltage, and rail-to- rail output capabilities make these operational amplifiers ideal for use in single lithium ion (li+), or two- cell nicd or alkaline battery systems. the rail-to-rail out- put stage of the max44264 is capable of driving the output voltage to within 4mv of the rail with a 100k load, and can sink and source 11ma with a +5v sup-ply. the ic is unity-gain stable and available in a space-saving 0.9mm x 1.3mm, 6-bump wlp package. applications cell phonestablet/notebook computers mobile accessories battery-powered devices features ? ultra-low 750na supply current per amplifier ? ultra-low +1.8v supply voltage operation ? ground-sensing input common-mode range ? outputs swing rail-to-rail ? outputs source and sink 11ma of load current ? no phase reversal for overdriven inputs ? high 120db open-loop voltage gain ? low 500 v input offset voltage ? 9khz gain-bandwidth product ? 250pf (min) capacitive load capability ? available in a tiny, 0.9mm x 1.3mm, 6-bump wlp package max44264 ultra-low power op amp in a tiny 6-bump wlp ___________________________________________________ _____________ maxim integrated products 1 19-5708; rev 0; 12/10 evaluation kit available ordering information part temp range pin- package top mark max44264ewt+ -40? to +85? 6 wlp +cb for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead(pb)-free/rohs-compliant package. downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v dd = +5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l = to v dd /2, t a = +25c , unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation 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. v dd to v ss ...............................................................-0.3v to +6v in_+ or in_-......................................(v ss - 0.3v) to (v dd + 0.3v) out_ shorted to v ss or v dd ......................................continuous continuous power dissipation (t a = +70?) 6-bump wlp (derate 10.5mw/? above +70?) .............840mw operating temperature range ......................... -40? to +85? junction temperature .....................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) ................................+300? soldering temperature (reflow) ......................................+260? parameter symbol conditions min typ max units supply voltage range v dd guaranteed by psrr tests 1.8 5.5 v v dd = +1.8v 0.6 supply current (peramplifier) i dd v dd = +5.0v 0.75 1.2 ? input offset voltage v os 0.5 7.0 mv input bias current i b 200 ?500 pa input offset current i os 12.5 pa input common-modevoltage range v cm guaranteed by the cmrr test v ss v dd - 1.1 v common-mode rejectionratio cmrr specified with v ss v cm (v dd - 1.1v) 70 95 db power-supply rejectionratio psrr +1.8v v dd +5.5v 70 90 db r l = 1m , v out = 50mv to v dd - 50mv 90 120 r l = 100k , v out = 200mv to v dd - 200mv 90 112 large-signal voltage gain a vol r l = 10k , v out = 200mv to v dd - 200mv 100 db r l = 1m 14 r l = 100k 41 0 v oh swing highspecified as v dd - v oh r l = 10k 40 r l = 1m 0.5 5 r l = 100k 15 output voltage swing v ol swing lowspecified as v ol - v ss r l = 10k 10 mv gain-bandwidth product gbw 9 khz phase margin m 90 d eg r ees downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp ___________________________________________________ ____________________________________ 3 note 1: all devices are production tested at t a = +25?. all temperature limits are guaranteed by design. electrical characteristics (continued) (v dd = +5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l = to v dd /2, t a = +25c , unless otherwise noted.) parameter symbol conditions min typ max units slew rate sr v out = 4v step 2 v/ms f = 1khz 150 input voltage noise e n f = 10khz 120 nv / hz shorted to v ss (sourcing) 11 output short-circuitcurrent shorted to v dd (sinking) 36 ma power-on time t on 2 s power-off time t off 2 ? capacitive load c load no sustained oscillations 250 pf electrical characteristics (v dd = +5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l = to v dd /2, t a = t min to t max , unless otherwise noted.) (note 1) parameter symbol conditions min typ max units supply voltage range v dd guaranteed by psrr tests 1.8 5.5 v supply current (peramplifier) i dd v dd = +5.0v 1.5 ? input offset voltage v os 15 mv input offset voltagetemperature coefficient tcv os 8 ?/ c input bias current i b 4.25 na input common-modevoltage range v cm guaranteed by the cmrr test v ss v dd - 1.1 v common-mode rejectionratio cmrr v ss v cm (v dd - 1.1v) 56 db +1.8v v dd +5.5v, 0 o c t a +85 o c6 5 power-supply rejectionratio psrr +2v v dd +5.5v, -40 o c t a +85 o c6 5 db v out = 50mv to v dd - 50mv, r l = 1m 75 large-signal voltage gain a vol v out = 200mv to v dd - 200mv, r l = 100k 75 db r l = 1m 5 v oh swing high specifiedas v dd - v oh r l = 100k 15 r l = 1m 5 output voltage swing v ol swing low specified asv ol - v ss r l = 100k 5 mv downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp 4 __________________________________________________ _____________________________________ typical operating characteristics (v dd = +5v, v ss = 0v, v cm = 0v, r l = 100k to v dd /2, t a = +25?, unless otherwise noted.) 0 0.20.1 0.50.4 0.3 0.7 0.80.6 0.9 1.5 3.0 3.5 2.0 2.5 4.0 4.5 5.0 5.5 6.0 supply current vs. supply voltage max44264 toc01 supply voltage (v) supply current ( a) 0 0.20.1 0.50.4 0.3 0.7 0.80.6 0.9 -50 0 -25 25 50 75 100 supply current vs. temperature max44264 toc02 temperature ( c) supply current ( a) 0 0.100.05 0.300.20 0.250.15 0.40 0.450.35 0.50 -50 0 -25 25 50 75 100 offset voltage vs. temperature max44264 toc03 temperature ( c) offset voltage (mv) 0 0.100.05 0.200.15 0.300.25 0.35 0.450.40 0.50 0 1.0 1.5 0.5 2.0 2.5 3.0 3.5 4.0 offset voltage vs. common-mode voltage max44264 toc04 common-mode voltage (v) offset voltage (mv) -400 -350 -150-250 -200-300 -50 -100 0 -50 0 -25 25 50 75 100 input bias current vs. temperature max44264 toc05 temperature ( c) input bias current (pa) -90 -70-80 -40-50 -60 -20 -10-30 0 01 . 5 1.0 0.5 2.0 2.5 3.0 3.5 4.0 input bias current vs. common-mode voltage max44264 toc06 common-mode voltage (v) input bias current (pa) 0 -100 10 100 10k 1k power-supply rejection ratio vs. frequency -80 -90 max44264 toc07 frequency (hz) psrr (db) -60 -70 -40 -30 -50 -20 -10 0 0.2 1.00.6 0.80.4 1.41.2 1.6 -50 0 -25 25 50 75 100 output voltage swing low vs. temperature max44264 toc08 temperature ( c) v ol - v ss (mv) r l = 100k r l = 1m 0 1 42 3 5 6 -50 0 -25 25 50 75 100 output voltage swing high vs. temperature max44264 toc09 temperature ( c) v dd - v oh (mv) r l = 100k r l = 1m downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp _______________________________________________________________________________________ 5 -120 -100-110 -60-80 -70-90 -40 -30-50 -20 -50 0 -25 25 50 75 100 common-mode rejection ratio vs. temperature max44264 toc10 temperature ( c) cmrr (db) 0 0.40.2 0.80.6 1.21.0 1.4 -50 0 25 -25 50 75 100 minimum supply voltage vs. temperature max44264 toc11 temperature ( c) minimum supply voltage (v) 60 70 80 90 100 110 120 130 140 2.5 3.0 3.5 4.0 4.5 5.0 a vol vs. output voltage swing max44264 toc12 output voltage (vp-p) a vol (db) r l = 1m r l = 10k r l = 100k 1 100 1k 10k 10 100k gain and phase vs. frequency max44264 toc13 frequency (hz) gain (db) phase (deg) 8070 60 50 40 30 20 -60 10 0 -10-20 -30 -40 -50 180135 9045 -135 0 -45 -90 gain phase c l = 12pf r l = 1m a vcl = 1000v/v 1 100 1k 10k 10 100k gain and phase vs. frequency max44264 toc14 gain (db) phase (deg) 8070 60 50 40 30 20 -60 10 0 -10-20 -30 -40 -50 180 135 90 45 -135 0 -45-90 gain phase r l = 1m a vcl = 1000v/v c l = 250pf 10.00 0.01 10 100 10k 1k total harmonic distortion plus noise vs. frequency max44264 toc15 frequency (hz) thd + n (%) 0.10 1.00 10k 10 10 1k 100 100k 10k voltage noise density vs. frequency max44264 toc16 frequency (hz) 100 1k noise (nv/ hz) 100k 100 10k 100k 1m stability vs. capacitive and resistive loads max44264 toc17 resistive load ( ) 1k 10k capacitive load (pf) unstableregion 0 12 84 16 20 24 28 32 36 40 02 13 4 5 i out vs. v out max44264 toc18 v out (v) i out (ma) i sink i source typical operating characteristics (continued) (v dd = +5v, v ss = 0v, v cm = 0v, r l = 100k to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
500 s/div small-signal step response input 50mv/div output 50mv/div max44264 toc21 v dd = +5v a v = +1v/v r l = 1m c l = 1000pf 500 s/div large-signal step response v dd = +5v a v = +1v/v r l = 1m c l = 12pf input 500mv/div output 500mv/div max44264 toc22 500 s/div large-signal step response input 500mv/div output 500mv/div max44264 toc23 v dd = +5v a v = +1v/v r l = 1m c l = 1000pf 0 5 2010 15 25 30 01 0 0 50 150 200 250 300 percent overshoot vs. capacitive load max44264 toc24 c load (pf) percent overshoot (%) r l = 10k r l = 100k r l = 1m 3 -7 100 1k 10k small-signal gain vs. frequency -5 -6 max44264 toc25 frequency (hz) gain (db) -3 -4 -1 0 -2 1 2 r l = 10k v out = 100mv p-p c l = 12pf a v = 1 3 -7 100 1k 100k 10k small-signal gain vs. frequency -5 -6 max44264 toc26 frequency (hz) gain (db) -3 -4 -1 0 -2 1 2 a v = 1 r l = 100k v out = 100mv p-p c l = 12pf max44264 ultra-low power op amp in a tiny 6-bump wlp 6 __________________________________________________ _____________________________________ 500 s/div small-signal step response v dd = +5v a v = +1v/v r l = 1m c l = 12pf input 500mv/div output 500mv/div max44264 toc19 500 s/div small-signal step response input 50mv/div output 50mv/div max44264 toc20 v dd = +5v a v = +1v/v r l = 1m c l = 250pf typical operating characteristics (continued) (v dd = +5v, v ss = 0v, v cm = 0v, r l = 100k to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
max44264 3 -7 100 1k 10k 100k small-signal gain vs. frequency -5 max44264 toc27 frequency (hz) gain (db) -3 -1 1 2 -6 -4 -2 0 a v = 1 r l = 1m v out = 100mv p-p c l = 12pf ultra-low power op amp in a tiny 6-bump wlp _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v dd = +5v, v ss = 0v, v cm = 0v, r l = 100k to v dd /2, t a = +25?, unless otherwise noted.) 3 -7 100 1k 10k large-signal gain vs. frequency -5 -6 max44264 toc28 frequency (hz) gain (db) -3 -4 -1 0 -2 1 2 a v = 1 r l = 10k v out = 1v p-p c l = 12pf 3 -7 100 1k 10k large-signal gain vs. frequency -5 -6 max44264 toc29 frequency (hz) gain (db) -3 -4 -1 0 -2 1 2 a v = 1 r l = 100k v out = 1v p-p c l = 12pf 3 -7 100 1k 10k large-signal gain vs. frequency -5 -6 max44264 toc30 frequency (hz) gain (db) -3 -4 -1 0 -2 1 2 a v = 1 r l = 1m v out = 1v p-p c l = 12pf downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp 8 __________________________________________________ _____________________________________ applications information ground sensing the common-mode input range of the max44264extends down to ground, and offers excellent common- mode rejection. these devices are guaranteed not to undergo phase reversal when the input is overdriven. power supplies and layout the ic operates from a single +1.8v to +5.5v powersupply. bypass power supplies with a 0.1? ceramic capacitor placed close to the v dd pin. ground layout improves performance by decreasing theamount of stray capacitance and noise at the op amp? inputs and outputs. to decrease stray capacitance, mini- mize pcb lengths and resistor leads, and place external components close to the op amps?pins. bandwidth the ic is internally compensated for unity-gain stabilityand has a typical gain-bandwidth of 9khz. stability the ic maintains stability in their minimum gain configu-ration while driving capacitive loads. although this prod- uct family is primarily designed for low-frequency applications, good layout is extremely importantbecause low-power requirements demand high-imped- ance circuits. the layout should also minimize stray capacitance at the amplifier inputs. however some stray capacitance may be unavoidable, and it may be neces- sary to add a 2pf to 10pf capacitor across the feedback resistor as shown in figure 1. select the smallest capaci- tor value that ensures stability. pin description pin name function a1 in+ noninverting amplifier input a2 v ss negative power-supply voltage b1 in- inverting amplifier input b2 v dd positive power-supply voltage c1 out amplifier output c2 n.c. no connection. not internally connected. r1 2pf to 10pf r2 v in v cc v ss max44264 figure 1. compensation for feedback node capacitance chip information process: bicmos wlp bump side down out n.c. in- v dd in+ v ss c1 c2 b1 b2 a2 a1 + top view max44264 pin configuration downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp ___________________________________________________ ____________________________________ 9 package information for the latest package outline information and land patterns, go to www.maxim-ic.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 th e package regardless of rohs status. package type package code outline no. land pattern no. 6 wlp w61b1+1 21-0217 downloaded from: http:///
max44264 ultra-low power op amp in a tiny 6-bump wlp maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 12/10 initial release downloaded from: http:///
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