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_______________general description the MAX687/max688/max689 low-dropout linear regula- tors operate with an input-to-output voltage differential lim- ited only by an external pnp transistor. outputs are fixed at 3.3v (MAX687/max688) or 3.0v (max689). the only external components required are a pnp pass transistor and output, compensation, and bypass capacitors. base drive to the external transistor is at least 10ma, permitting output currents to exceed 1a when using high-gain tran- sistors ( b > 100). output current limiting is implemented by limiting the external transistor? base current. output voltage monitoring and shutdown functions are included. the 3.3v MAX687 automatically shuts down whenever the output voltage drops below 2.96v. an internal power-fail comparator also monitors the output and pro- vides an early warning of low output voltage before the device shuts down. when shut down, the output is latched off until the on input is pulsed. turning off the power supply in this way prevents battery damage due to excessive discharge or cell-reversal. typical applica- tions include portable telephones and other battery-pow- ered equipment where the power supply must be disabled when the battery voltage is low. the max688 and max689 do not have an automatic shutdown function, and are identical except for their output voltages. each device has an active-low shut- down-control input, used to turn its output on or off at any time. as shdn falls, the device enters a standby mode before fully shutting down. when in standby, the reference and comparators are fully operational, per- mitting the transition from normal mode to standby mode to occur at a precise voltage level on shdn . ________________________applications high-efficiency linear regulator battery-powered devices portable instruments portable telephones power supply or backup supply for memory ____________________________features ? fixed outputs: 3.3v (MAX687/max688) 3.0v (max689) ? directly drives external pnp transistor ? 10ma min base-current drive for >1a output ? low dropout voltage: 100mv dropout at 650ma output (fzt749) 40mv dropout at 200ma output (fzt749) 0.8v dropout at 4a output ? power-fail output monitors the output voltage ? automatic, latched shutdown when output falls out of regulation (MAX687) ? precision threshold shutdown control (max688/max689) ? low supply current: 150? operating <1? shutdown ? 2.7v to 11.0v supply range ? 8-pin dip/so/?ax packages ? <2mv line transient with 3.4v to 3.6v input ? output accuracy MAX687/max688/max689 high-accuracy, low-dropout linear regulators ________________________________________________________________ maxim integrated products 1 MAX687 q1 fzt749 r b 12 w base gnd c1 2.2 m f in blim out power-fail output 3.3v @ 500ma pfo cc +3.5v to +5v input on c3 10nf on gnd c2 68 m f __________typical operating circuit 1 2 3 4 8 7 6 5 cc base blim out gnd pfo (on) shdn in MAX687 max688 max689 dip/so/ m max top view ( ) are for MAX687 __________________pin configuration call toll free 1-800-998-8800 for free samples or literature. 19-0329; rev 0; 12/94 part MAX687 cpa MAX687csa MAX687cua 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 8 plastic dip 8 so 8 ?ax evaluation kit manual follows data sheet MAX687epa MAX687esa -40? to +85? -40? to +85? 8 plastic dip 8 so
MAX687/max688/max689 high-accuracy, low-dropout linear regulators 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = 3.8v, shdn = v in (max688/max689), r b = 0 , c1 = 2.2?, c2 = 10?, c3 = 10nf, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) 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. input supply voltage in to gnd ............................................12v terminal voltages to gnd pfo (MAX687) ........................................-0.3v to v out + 0.3v pfo (max688/max689) ......................................-0.3v to 12v all remaining pins .....................................-0.3v to v in + 0.3v pfo sink current ...............................................................10ma pfo source current (MAX687)...........................................10ma continuous power dissipation (t a = +70?) plastic dip (derate 9.09mw/? above +70?) ............727mw so (derate 5.88mw/? above +70?) .........................471mw ?ax (derate 4.1mw/? above +70?) ......................330mw operating temperature ranges max68_c_a .......................................................0? to +70? max68_e_a ....................................................-40? to +85? storage temperature range .............................-65? to +165? lead temperature (soldering, 10sec) .............................+300? MAX687/max688 (note 1) v base = v in - 1v pnp = fzt749, i load = 100ma (note 4) v in = 3.8v, pnp = fzt749, no load (note 3) 1? i base 10ma r b is connected from base to blim ( ), r b = 0 to 100 conditions ? 10 c2 load capacitance % 2 start-up overshoot ? 300 start-up time ma 70 100 130 r b + 5 r b + 5 r b + 5 base-current limit v 3.2 3.3 3.4 v out output voltage v 2.7 11.0 v in supply voltage ma 10 20 40 i base base sink current < 0.02 1 11 25 ? 150 250 i gnd supply current 3.13 3.3 3.47 mv 40 v in - v out dropout voltage (note 2) mv/v 0.4 1.4 line regulation mv 45 60 load regulation units min typ max symbol parameter v in = 3.8v, i base = 1ma 3.8v v in 11.0v, 1? i base 10ma pnp = fzt749, i load = 200ma, c2 = 20? 3.8v v in 11.0v, i base = 1ma MAX687/max688 max689 2.9 3.0 3.1 2.85 3.0 3.15 v in = 3.5v, i base = 1ma 3.5v v in 11.0v, 1? i base 10ma max689 3.5v v in 11.0v, i base = 1ma 0.4 1.4 on standby, max688/max689 shutdown linear regulator
MAX687/max688/max689 high-accuracy, low-dropout linear regulators _______________________________________________________________________________________ 3 note 1: minimum v in for regulated v out depends on the characteristics of the external pnp transistor, and on the load. the refer- ence and comparators are functional down to the minimum voltage specified, but the output may not be in regulation. note 2: dropout voltage is defined as v in - v out when v out is 50mv below its value at v in = v nom + 1v. note 3: the start-up time specification is the time taken from on or shdn rising to base sinking current. v out rise time is longer and is a function of load capacitance, c2, and load resistance, r l . note 4: minimum load capacitance is a function of r l . minimum c2 = 10? for loads up to 100ma and 1?/10ma for higher loads. esr of c2 should be no larger than 1/100 of r l . guaranteed by design. note 5: the nominal output voltage, v nom , is defined under the default conditions of testing: v in = 3.8v, i base = 1ma, t a = t min to t max . electrical characteristics (continued) (v in = 3.8v, shdn = v in (max688/max689), r b = 0 , c1 = 2.2?, c2 = 10?, c3 = 10nf, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) falling v out , comparators monitor v out glitch immunity rising shdn , standby ? on shutdown standby falling v out , comparators monitor v out on, shdn falling output turns on conditions ? 100 pfo , shdn transient rejection mv 70 shdn hysteresis 0.2 v ssd 1.0 1.2 v ssy v 1.25 v son shdn threshold voltages mv 110 170 v nom - v pft pfo threshold voltage below v nom (note 5) mv 7 pfo hysteresis v 2.96 v sd shutdown threshold voltage v 1.0 v ih on threshold voltage units min typ max symbol parameter i source = 50?, part on, v in = 2.7v v v out - 0.3 v oh pfo output voltage high i sink = 1.2ma, v in = 2.7v v 0.06 0.3 v ol pfo output voltage low output remains off 0.2 v il na 0.2 100 on input leakage current falling v out , com- parators monitor v out v 3.07 3.13 3.19 v pft pfo threshold voltage max688 max689 2.77 2.85 2.89 v shdn = 1.23v na -25 25 shdn input current 10hz f 10khz, i load = 200ma v pfo = 11v, v shdn > 1.25v i sink = 1.2ma, v in = 2.7v ? 1 66 e n output noise voltage pfo off leakage current v 0.06 0.3 v ol pfo output voltage low 10hz f 1mhz, i load = 200ma ? rms 105 falling v out , comparators monitor v out mv 20 70 v pft - v sd shutdown threshold voltage below v pft mv 7 pfo hysteresis max688/max689: shdn , pfo MAX687: on, pfo , shdn
MAX687/max688/max689 high-accuracy, low-dropout linear regulators 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (circuits of figures 1 and 2, v in = 5v, q1 = fzt749, t a = +25?, unless otherwise noted.) 3.29679 3.29904 3.29455 3.29231 3.29007 3.28783 3.30128 3.30352 3.30576 3.30800 3.31024 3.31248 3.31472 3.31696 3.31920 3.32145 0 50 100 number of units 250 200 150 max688 output voltage distribution MAX687/9-01 output voltage (v) 3.28365 3.28722 3.29078 3.29435 3.29792 3.30149 3.30505 3.30862 3.31219 3.31576 3.31932 3.32289 0 50 100 250 200 150 MAX687 output voltage distribution MAX687/9-02 output voltage (v) number of units 2.98975 2.99150 2.99324 2.99499 2.99674 2.99848 3.00023 3.00198 3.00372 3.00547 3.00721 3.00896 3.01071 3.01245 3.01420 3.01595 0 50 100 250 200 150 max689 output voltage distribution MAX687/9-03 output voltage (v) number of units 7 6 5 4 3 2 1 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 gnd current vs. dropout voltage MAX687/9-7 v in - v out (v) gnd current (ma) 300ma load 100ma load 10ma load 0 0.05 0.10 0.15 0.20 0.25 0.30 0 200 600 1000 1400 1800 dropout voltage vs. load current MAX687/9-05 load current (ma) v in - v out (v) q1 = fzt749 r b = 0 w observe maximum power dissipation limit of external pass transistor. 0 1 2 3 4 5 6 0 200 400 600 800 1000 1200 gnd current vs. load current MAX687/9-06 load current (ma) gnd current (ma) 7 6 5 4 3 2 1 0 08 12345 7 6 gnd current vs. dropout voltage MAX687/9-8 v in - v out (v) gnd current (ma) 300ma load 100ma load 10ma load 146 126 no-load supply current vs. temperature 130 128 134 132 138 136 142 144 140 MAX687/9-9 temperature (?) supply current ( m a) -55 -25 0 25 50 75 100 125 1.0 0 0 200 600 1000 dropout voltage vs. load current 0.2 0.1 0.4 0.3 0.6 0.5 0.8 0.9 0.7 MAX687/9-5 load current (ma) v in - v out (v) 400 800 q1 = 2n2907 r b = 0 w
MAX687/max688/max689 high-accuracy, low-dropout linear regulators _______________________________________________________________________________________ 5 0 0.0500 0.1000 0.1500 0.2000 0.2500 0.3000 -55 -25 0 25 50 75 100 125 shutdown supply current vs. temperature MAX687/9-10 temperature (?) shutdown supply current ( m a) 3.280 3.285 3.290 3.295 3.300 3.305 3.310 3.315 output voltage vs. temperature MAX687/9-11 temperature (?) output voltage (v) -55 -25 0 25 50 75 100 125 i load = 70ma c1 = 2.2 m f c2 = 20 m f c3 = 10nf line-transient response v out 3.3v 1mv/div v in 3.6v v in 3.4v 2ms/div i load = 200ma c1 = 2.2 m f c2 = 20 m f c3 = 10nf line-transient response v out 3.3v 1mv/div v in 3.6v v in 3.4v 2ms/div v in = 3.4v load-transient response v out 3.3v 10mv/div 500ma 0ma 100 m s/div i load 200ma/div v in = 3.5v load-transient response v out 3.3v 10mv/div 500ma 0ma 100 m s/div i load 200ma/div ____________________________typical operating characteristics (continued) (circuits of figures 1 and 2, v in = 5v, q1 = fzt749, t a = +25?, unless otherwise noted.) i load = 500ma c1 = 2.2 m f c2 = 68 m f c3 = 10nf MAX687/max688 power-up and exit from shutdown v in 5v/div v out 1v/div shdn 5v/div 1ms/div 80 0 10 100 1k 10k 100k MAX687/max688 ripple rejection vs. frequency 10 20 MAX687/9-16 frequency (hz) ripple rejection (db) 30 40 50 60 70 c2 = 20 m f v in = 4.3v min i load = 20ma v in = 3.6v min i load = 200ma
2 MAX687/max688/max689 high-accuracy, low-dropout linear regulators 6 _______________________________________________________________________________________ ______________________________________________________________pin description name function 1 in positive input voltage, 2.7v to 11.0v 2 on (MAX687) on activates the regulator when pulsed high. in order for the regulator to remain on, on must remain high until v out exceeds the internal shutdown threshold voltage. the MAX687 is shut down when v out < 2.96v, and remains latched off until on is pulsed high. when powered up, the MAX687 does not start up until on is pulsed high. connect to v in if not used. pin shdn (max688/ max689) shdn is a three-level input that controls the mode of operation. the device is on when v shdn > 1.25v. the output is disabled and the supply current is reduced (i in < 25?, standby mode) when v shdn < 1.2v, and is fully off (i in < 1?, shutdown mode) when v shdn < 0.2v. connect shdn to in if the shutdown func- tion is not used. pfo is low when shdn is low (below 0.2v). 3 pfo power-fail output. pfo trips when v out is 170mv below nominal v out at i base = 1ma. pfo sources and sinks current in the MAX687, but is an open drain in the max688/max689. when shut down, pfo is always low and sinks current. leave pfo open if not used. 7 base base drive for the external pnp transistor. current limiting is controlled using a resistor (r b ) connected between base and blim. for maximum output current, connect base to blim. 6 blim base current limit. a resistor (r b ) connected between base and blim sets the maximum base drive to the pnp transistor: i base 0.1v / (r b + 5 ). this limits quiescent current rise during dropout and also pro- vides current limiting without using a current-sense resistor in the collector of the external pnp, thus not impacting dropout. output current limiting accuracy depends on how well the external pnp beta (h fe ) is controlled. connect to base if not used. 5 out regulator output. MAX687/max688, 3.3v; max689, 3.0v. 4 gnd ground 8 cc compensation capacitor. connect a non-polarized capacitor (10nf to 100nf) from cc to gnd. _______________detailed description the MAX687/max688/max689 are precision low- dropout linear regulators employing external pnp tran- sistors to achieve a wide range of output currents at voltages of 3.0v or 3.3v. the maximum base current for the pnp can be limited using a resistor. limiting the base drive keeps high currents from being wasted when the device is in dropout (e.g., at low input volt- ages), and limits the regulator? output current. the dropout voltage is limited only by the pnp transistor? v ce(sat) . the power-fail output (pfo ) goes low when the output voltage drops 170mv below the nominal level. the three devices differ in their output voltages, in their shutdown-control functions, and in pfo ? output drive (see table 1). the MAX687? output voltage is internally monitored; a falling v out is signaled by pfo going low. as the out- put falls further, the MAX687 automatically enters a low- power shutdown mode, where the base drive to the external pnp is cut off. pfo trips at a minimum of 110mv below the nominal v out , and shutdown occurs by 2.96v. pfo is guaranteed to trip before the device table 1. device functions function MAX687 max688 max689 v out 3.3v 3.3v 3.0v shutdown control automatic at low v out . latched. use on to start. external shdn external shdn pfo sources & sinks open drain open drain
shuts down. once the MAX687 is shut down, it can only be turned on again when (a) the on pin is pulsed high, and (b) the conditions that triggered shutdown have changed (e.g., the load has been reduced or the input voltage has increased). in order for the MAX687 to latch into its on state, the on pulse must remain high until the output voltage has risen above the shutdown threshold. the internal shutdown can be used to pre- vent deep discharge of a battery, for example, to pro- vide ?elf backup?of cmos ram or to protect the battery itself. the rc circuit attached to the on input in figure 1 achieves automatic start-up at power-on by delivering a brief pulse whenever the input voltage is suddenly applied. this circuit is not suitable for applications where the input voltage rises slowly. the rc values should be chosen to keep on high until the output rises above about 3.13v. the values shown in figure 1 for c4 and r1 (0.1? and 10k ) are suitable for most applications. to ensure start-up when the input voltage is very close to the circuit? dropout voltage, when the circuit is used to drive a very large capacitive load, or for high-power circuits (i load > 3a), increase the value of r1 to increase the on pulse width. the 3.3v max688 and the 3.0v max689 incorporate the same pfo warning whenever v out droops. however, the max688/max689 do not automatically shut down when the output voltage drops even further. instead, the shdn input controls external shutdown. as shdn is pulled low, the chip first enters a low-cur- rent standby state (<25?). the threshold at which standby mode is entered is precisely controlled (?%) so the output can be turned off at a well-defined point. 70mv of hysteresis between the standby and on states prevents chatter between the two modes. the voltage applied to the shdn pin can be derived from a resis- tive divider from v in . when v shdn is less than 1.2v, the output is off. the device is fully shut down (<1?) when shdn is pulled below 200mv. shdn is not latched, and as shdn is raised, the max688/max689 exit shutdown and enter the standby mode. at the higher shdn threshold, the output is turned on. figure 1 shows a typical circuit for the MAX687, and figure 2 shows the same circuit configured for the max688/max689. the accuracy of the output current limit depends on accurate knowledge of the pnp pass transistor? cur- rent gain (h fe ). with r b = 12 , blim limits base cur- rent to 6ma (i base = 0.1v / (r b + 5 )). see base- current limiting section. the pfo comparators on all three devices, and the internal shutdown comparator on the MAX687, reject high-speed spikes (<100?). this reduces the pfo output? noise sen- sitivity, and stops the MAX687 from being shut down inad- vertently when there is noise on the input supply. _______________transistor selection specifications the pnp pass transistor must meet specifications for current gain, power dissipation, and collector current. the h fe influences the maximum output current the cir- cuit can deliver. the largest guaranteed output current MAX687/max688/max689 high-accuracy, low-dropout linear regulators _______________________________________________________________________________________ 7 MAX687 out 3.3v @ 500ma power fail pfo cc c1 2.2 m f c4 0.1 m f blim gnd base q1 fzt749 r b 12 w c3 10nf in on +5v input gnd r1 10k w on can be driven directly from logic when r1 and c4 are not used. c2 68 m f figure 1. MAX687 operating circuit max688 max689 out 3.3v/ 3.0v @ 500ma power fail pfo cc c1 2.2 m f blim gnd base q1 fzt749 r b 12 w c3 10nf in shdn +5v input gnd r2 100k c2 68 m f on / off figure 2. max688/max689 operating circuit
MAX687/max688/max689 high-accuracy, low-dropout linear regulators 8 _______________________________________________________________________________________ is given by i load(max) = 10ma x h fe(min) . the tran- sistor? rated power dissipation must exceed the actual power dissipated in the transistor. the power dissipat- ed (pd) equals the maximum load current (i load(max) ) times the maximum input to output voltage differential: pd = i load(max) x (v in(max) - v out ). the rated tran- sistor collector current must exceed the maximum load current. suitable transistors include the zetex fzt749, and the 2n2907a (see table 2). base-current limiting a comparator monitors the voltage across the external base-current-limiting resistor (between base and blim). this sets the maximum base current. if base and blim are shorted, base current is limited nominally to 20ma due to an internal 5 resistor in series with the external resistance. choose the base-current-limiting resistor, r b , so the drop across it at rated load is approximately 50mv. the base drive is controlled so the voltage on blim is limited to 100mv below the voltage on base; with a 50mv nominal drop across r b + 5 , base-current drive is limited to twice the nominal. this limits base current when the external pnp is heavily saturated, such as when the regulator is in dropout due to low input volt- age. in addition, if the external pnp? h fe is defined within reasonable limits, base-current control effectively limits output current without a dropout voltage penalty. ________________capacitor selection bypass capacitor (c1) connect a bypass capacitor from in to gnd. 4.7? makes the circuit insensitive to layout, and is sufficient for any load. smaller values may be used?own to 0.33??ith low-esr capacitors, good board layout, and a low-impedance incoming supply. connect the bypass capacitor directly between pins 1 and 4 of the ic, using short leads. connect the emitter of the pnp transistor directly to the bypass capacitor using a very short trace. output capacitor (c2) the output filter capacitor must be at least 10?. for currents above 100ma, use 1f of capacitance for every 10ma of load current (e.g., 20? for 200ma load, 50? for 500ma). low-esr capacitors give best stabili- ty and transient response. ensure that the capacitor? esr is less than 1% of the load resistance. see table 2 for a list of manufacturers. sanyo os-con capacitors are recommended for applications operating at temper- atures below 0?. compensation capacitor (c3) connect a compensation capacitor from cc to gnd. 10nf is recommended, although higher values (up to 100nf) may also be used. higher c3 values eliminate power-on overshoot, but extend power-up times. current flowing into or out of cc causes the regulator? reference voltage to change, resulting in shifted output voltage and trip thresholds. use non-polarized capaci- tors (e.g., ceramic, polyester, etc.) to keep leakage cur- rents below 25na. aluminum and tantalum electrolytic capacitors are unsuitable because of their high leakage currents. __________________power-fail output the pfo output trips when v out is 170mv below nomi- nal v out at i base = 1ma. pfo sources and sinks cur- rent in the MAX687, but is an open drain in the max688/max689 and only sinks current. when shut down, pfo is always low regardless of the voltage at out. leave pfo open if it is not used. r mv x h i b fe(min) load(max) = () -w 50 5
__________applications information high-power output circuit figure 3 shows a pseudo-darlington transistor configu- ration to increase load-current capability and maintain a low dropout voltage with a 4a load. a heatsink must be added when high power is dissipated in the pass transistor. figure 4 shows the (v in - v out ) voltage required to maintain regulation for different load currents. figure 5 shows an oscilloscope plot of the transient response of a 200ma to 4a load step. MAX687/max688/max689 high-accuracy, low-dropout linear regulators _______________________________________________________________________________________ 9 max688 max689 out 3.3v/ 3.0v @ 4a pfo cc c1 220 m f +5v input blim gnd base q2 2n4403 c3 10nf in shdn r2 100k w c2 470 m f x3 q1 t1p42 10 w 1k w on / off power fail figure 3. 4a low-dropout circuit 1.0 0 0 4000 1000 2000 3000 dropout voltage vs. load current 0.2 0.1 0.4 0.3 0.6 0.5 0.8 0.9 0.7 MAX687/9-04 load current (ma) v in - v out (v) q1 = tip42 q2 = 2n4403 base = blim figure 4. dropout voltage vs. load current of figure 3 v out +3.3v, 20mv/div i out 1a/div 50 m s/div load-transient response figure 5. transient response for a 200ma to 4a load step using circuit of figure 3
MAX687/max688/max689 high-accuracy, low-dropout linear regulators 10 ______________________________________________________________________________________ table 2a. component suppliers device manufacturer production method 267 series matsuo surface mount f95 tantalum series nichicon 595 tantalum series sprague os-con series low-esr organic semiconductor sanyo through-hole lxf series united chemi-con ztx749 zetex through-hole t1p42 motorola 2n4403 motorola 2n2907a motorola cmpt2907a central semiconductor surface mount pzt2907at1 motorola fzt749 zetex capacitors bipolar transistors table 2b. manufacturers?phone and fax numbers manu- facturer country telephone fax central semiconductor usa (516) 435-1110 (516) 435-1824 matsuo usa (714) 969-2491 (714) 960-6492 motorola usa (602) 244-3370 (602) 244-4015 nichicon usa (708) 843-7500 (708) 843-2798 japan +81-7-5231- 8461 +81-7-5256- 4158 sanyo usa (619) 661-6835 (619) 661-1055 japan +81-7-2070- 6306 +81-7-2070- 1174 sprague usa (603) 224-1961 (603) 224-1430 united chemi-con usa (714) 255-9500 (714) 255-9400 usa (516) 543-7100 (516) 864-7630 zetex uk +44-61-627- 5105 +44-61-627- 5467
MAX687/max688/max689 high-accuracy, low-dropout linear regulators ______________________________________________________________________________________ 11 _ordering information (continued) part max688 cpa max688csa max688cua 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 8 plastic dip 8 so 8 ?ax max688epa max688esa -40? to +85? -40? to +85? 8 plastic dip 8 so max689 cpa max689csa max689cua 0? to +70? 0? to +70? 0? to +70? 8 plastic dip 8 so 8 ?ax max689epa max689esa -40? to +85? -40? to +85? 8 plastic dip 8 so
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. 12 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1994 maxim integrated products printed usa is a registered trademark of maxim integrated products. MAX687/max688/max689 high-accuracy, low-dropout linear regulators 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. 12 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1994 maxim integrated products printed usa is a registered trademark of maxim integrated products. ________________________________________________________package information l a c a1 b dim a a1 b c d e e h l a min 0.036 0.004 0.010 0.005 0.116 0.116 0.188 0.016 0 max 0.044 0.008 0.014 0.007 0.120 0.120 0.198 0.026 6 min 0.91 0.10 0.25 0.13 2.95 2.95 4.78 0.41 0 max 1.11 0.20 0.36 0.18 3.05 3.05 5.03 0.66 6 inches millimeters 8-pin m max micromax small outline package 0.65 0.0256 a e e h d 0.101mm 0.004 in

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