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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim's website at www.maxim-ic.com. general description the max8880/max8881 are ultra-low supply current, low-dropout linear regulators, capable of delivering up to 200ma. they are designed for battery-powered applications where reverse battery protection and long battery life are critical. these regulators?low 3.5? supply current extends bat- tery life in applications with long standby periods. unlike pnp-based designs, a 2 pmos device maintains ultra- low supply current throughout the entire operating range and in dropout. the parts are internally protected from output short circuits, reverse battery connection, and thermal overload. an internal power-ok (pok) com- parator indicates when the output is out of regulation. the max8880 output is adjustable from 1.25v to 5v using an external resistor-divider. the max8881 pro- vides only factory-preset output voltages of 1.8v, 2.5v, 3.3v, or 5v (see ordering information ). the devices are available in 6-pin sot23 and 6-pin tdfn packages. features ? 3.5a supply current at 12v ? reverse battery protection ? 2.5v to 12v input voltage range ? 1.5% output voltage accuracy ? 200ma max output current ? 2 pmos output device ? short-circuit and thermal overload protection ? pok output for out-of-regulation indicator ? fixed 1.8v, 2.5v, 3.3v, and 5v (max8881) adjustable from 1.25v to 5v (max8880) ? tiny 6-pin sot23 package ? thin 6-pin tdfn package max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok ________________________________________________________________ maxim integrated products 1 gnd fb out 16 pok 5 in max8880 max8881 max8880 sot23-6 top view 2 34 shdn pok in 1 gnd out 2 3 6 5 4 fb tdfn 3mm x 3mm shdn pin configurations in out fb gnd 4.7 f 1 f on off shdn v in 2.5v to 12v regulation ok v out 1.25v to 5v up to 200ma pok max8881 typical operating circuit ________________________applications 19-1679; rev 2; 12/07 ordering information part output temp range pin-package top mark max8880 eut-t adjustable -40 c to +85 c 6 sot23-6 aahr MAX8880ETT-T adjustable -40 c to +85 c 6 tdfn ags max8881 eut18-t 1.8v -40 c to +85 c 6 sot23-6 aahs max8881eut25-t 2.5v -40 c to +85 c 6 sot23-6 aaht max8881eut33-t 3.3v -40 c to +85 c 6 sot23-6 aahu max8881eut50-t 5.0v -40 c to +85 c 6 sot23-6 aahv smoke detectors battery-powered alarms remote transmitters smart battery packs pdas handy terminals cmos backup power real-time clocks
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v out + 1v, shdn = in, c out = 4.7?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) 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. in to gnd ................................................................-14v to +14v shdn to gnd .............................................-0.3v to (v in + 0.3v), -0.3v to +0.3v when v in < 0v out, fb to gnd...............................-0.3v to +6v when v in > 5.7v, -0.3v to (v in + 0.3v) when 0v v in 5.7v, -0.3v to +0.3v when v in < 0v pok to gnd ...........................................................-0.3v to +14v out continuous current...................................................200ma out short circuit...........................................................indefinite continuous power dissipation (t a = +70 c) 6-pin sot23 (derate 8.7mw/ c above +70 c)...........696mw 6-pin tdfn (derate 24.4mw/ c above +70 c) ........1951mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature.........................................-65 c to +165 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units input voltage range v in 2.5 12 v supply current i in v in = 12v 3.5 10 a shutdown supply current i in ( shdn ) v shdn = 0, v in = 12v, v out = 0, t a = +25 c 1.5 3 a input undervoltage lockout v uvlo 2.1 2.4 v t a = +25 c 1.238 1.257 1.276 t a = 0 c to +85? 1.232 1.282 fb voltage, adjustable mode v fb max8880, i out = 20ma t a = -40 c to +85? 1.219 1.295 v t a = +25 c -1.5 1.5 t a = 0 c to +85? -2 2 out voltage accuracy (note 2) max8881, i out = 20ma t a = -40 c to +85? -3 3 % out voltage range v out max8880 1.25 5.5 v out line regulation v in = v out + 1v to 12v 0.01 0.05 %/v out load regulation (note 3) i out = 10 a to 100ma 0.006 0.015 %/ma current limit (note 3) i out 200 400 ma dropout voltage (notes 3, 4) v do i out = 50ma 100 200 mv in reverse leakage current i in(rev) v in = -12v, v shdn = 0 1ma foldback current limit i out ( sc ) v in = 5v, v out = 0 250 ma v ih 2 shdn input threshold v il v in = 2.5v to 12v 0.5 v shdn input bias current v shdn = 0 to 12v, t a = +25 c -100 100 na fb input bias current i fb fb = 1.25v, t a = +25 c, max8880 only 0 2 20 na t a = +25 c 87.5 90.5 93.5 falling t a = -40? to +85 c 86 95 pok trip threshold hysteresis 1.5 % of v out pok off-current i pok v pok = 12v, t a = +25 c 100 na pok low voltage v pok i pok = 1ma 50 200 mv
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok _______________________________________________________________________________________ 3 0 1.0 0.5 2.5 2.0 1.5 4.0 3.5 3.0 4.5 04 2681012 supply current vs. input voltage max8880/1-01 input voltage (v) supply current (?) i out = 30 ma no load 0 1.5 1.0 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 10 -15 35 60 85 supply current vs. temperature max8880/1-02 temperature (?) supply current (?) v out = 1.8v 0 150 100 50 200 250 300 350 400 450 500 0 50 100 150 200 dropout voltage vs. load current max8880/1-03 load current (ma) dropout voltage (mv) t a = +85 c t a = +25 c t a = -40 c 0 70 60 50 40 30 20 10 0.1 10 1 100 1k 10k power-supply rejection ratio vs. frequency max8880/1-04 frequency (hz) psrr (db) 10 100 10k 1k 100k frequency (hz) 10 1 0.01 0.10 max186-14a output noise spectral density vs. frequency noise (?/ hz) 0 50 100 150 200 250 300 350 400 0 20406080100 output noise vs. load current max8880/1-06 load current (ma) output noise ( v rms ) v out = 1.8v c out = 1.0 f c out = 4.7 f typical operating characteristics (v in = 5v, v out = 3.3v, i out = 30ma, c out = 4.7?, t a = +25?, unless otherwise noted. see figure 1.) note 1: all devices are 100% production tested at t a = +25?. all temperature limits are guaranteed by design. note 2: output accuracy with respect to nominal preset voltages. fb = out. note 3: this specification is valid for v in > 3v. note 4: the dropout voltage is defined as v in - v out , when v out is 100mv below the value of v out for v in = v out + 1v. electrical characteristics (continued) (v in = v out + 1v, shdn = in, c out = 4.7?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units thermal shutdown threshold t tsd (hysteresis = 15 c) 160 c out noise v out ( noise ) f = 10hz to 100khz, i out = 1ma 300 v rms
-0.20 -0.15 -0.10 -0.05 0 0.05 0.10 0.15 0.20 -40 -15 10 35 60 85 change from nominal output voltage vs. temperature max8880/1-10 temperature ( c) change from nominaloutput voltage (%) 100 0.1 0 100 200 region of stable c out esr vs. output current 1 10 max8880/1-11 output current (ma) c out esr ( ) 50 150 stable region c out = 10? c out = 4.7? 200?/div line-transient response max8880/1-12 9.75v 9v c h1 = v in , 500mv/div, ac coupled c h2 = v out , 20mv/div, ac coupled v out = 5v, i out = 5ma 400?/div load-transient response max8880/1-13 32.5ma 1.25ma c h1 = i out , 12.5ma/div c h2 = v out , 100mv/div, ac coupled v out(nominal) = 5v, v in = 9v 400?/div load-transient response near dropout max8880/1-14 32.5ma 1.25ma c h1 = i out , 12.5ma/div c h2 = v out , 100mv/div, ac coupled v in = 5.2v, v out(nominal) = 5v 100?/div turn-on response max8880/1-15 4v 1.8v c h1 = shdn, 2v/div c h2 = v out , 1v/div v in = 4.0v max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v in = 5v, v out = 3.3v, i out = 30ma, c out = 4.7?, t a = +25?, unless otherwise noted. see figure 1.) -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0 50 100 150 200 output voltage error vs. load current max8880/1-07 load current (ma) output voltage error (%) 3.3 3.4 3.6 3.5 3.7 3.8 supply current vs. load current max8880/1-08 load current (ma) supply current ( a) 0 100 50 150 200 0 1.00 0.50 2.00 1.50 3.00 2.50 3.50 046 2 8 10 12 14 output voltage vs. input voltage max8880/1-09 input voltage (v) output votlage (v)
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok _______________________________________________________________________________________ 5 detailed description the max8880/max8881 are low-dropout, low-quies- cent current linear regulators designed primarily for battery-powered applications (figure 1). the max8880 provides an adjustable output voltage from 1.25v to 5v using an external resistor-divider. the max8881 is available in factory preset output voltages of 1.8v, 2.5v, 3.3v, and 5v. both devices have a +1.25v reference, error amplifier, mosfet driver, and p-channel pass transistor (figure 2). low-dropout regulator the 1.25v reference is connected to the error amplifi- er? inverting input. the error amplifier compares this reference with the selected feedback voltage and amplifies the difference. the mosfet driver reads the error signal and applies the appropriate drive to the p- channel pass transistor. if the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, allowing more current to pass, increasing the output voltage. if the feedback voltage is higher than the reference voltage, the pass-transistor gate is driven higher, allowing less current to pass to the out- put. the output voltage is fed back through either an internal resistor voltage divider by externally connect- ing fb to out (max8881), or an external resistor net- work connected to fb (max8880). additional blocks include an output current limiter, reverse battery pro- tection, a thermal sensor, shutdown logic, and a pok comparator to indicate when the output is out of regula- tion (figure 2). internal p-channel pass transistor the max8880/max8881 feature a 2 p-channel mos- fet pass transistor. this provides advantages over similar designs using pnp pass transistors, including longer battery life. the p-channel mosfet requires no base drive, which reduces quiescent current consider- ably. pnp-based regulators waste considerable current in dropout when the pass transistor saturates. they also use high base-drive currents under large loads. the max8880/max8881 do not suffer from these prob- lems and consume only 3.5? of supply current (see typical operating characteristics ). dropout voltage a regulator? minimum input-output differential (or dropout voltage) determines the lowest usable supply voltage. in battery-powered systems, this determines the useful end-of-life battery voltage. because the max8880/max8881 use a p-channel mosfet pass transistor, their dropout voltage is r ds(on) (2 ) multi- plied by the load current (see electrical characteristics ). in r2* 100k out fb gnd c2 4.7 f c1 1 f shdn 2.5v to 12v regulation ok pok max8881 v in v out *optional figure 1. standard application circuit pin max888_ (sot) max888_ (tdfn) name function 1 4 in input voltage. bypass with a 1? capacitor to gnd. 2 2 gnd ground 3 3 out output voltage. bypass with a 4.7? capacitor (<0.5 esr) to gnd for load currents up to 200ma. for load currents up to 40ma, 1? is acceptable. 41fb feedback set point, 1.25v (max8880 only). output sense, connect to out externally (max8881 only). 5 5 shdn on/off control. regulator is on when v shdn > 2v. if unused, connect to in. if reverse battery protection of the shdn input is desired, connect a 100k resistor in series with shdn . 6 6 pok pok output, open drain. low when out is out of regulation or in shutdown. connect pok to out through a high-value resistor for a simple error ep exposed paddle (tdfn only). connect to the circuit ground plane. pin description
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 6 _______________________________________________________________________________________ reverse battery protection the max8880/max8881 have a unique protection scheme that limits the reverse supply current to less than 1ma when v in is forced below ground. the circuit monitors the polarity of in, disconnecting the internal circuitry and parasitic diodes when the battery is reversed. this feature prevents the device from electri- cal stress and damage when the battery is connected backwards. if reverse battery protection is needed, drive shdn through a 100k resistor. current limiting the max8880/max8881 include a current limiter. when the output is shorted to ground, drive to the output pmos is limited. the output can be shorted to ground without damage to the part. thermal overload protection thermal overload protection limits total power dissipa- tion in the max8880/max8881. when the internal junc- tion temperature exceeds t j = +160?, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the ic to cool. the thermal sen- sor turns the pass transistor on again after the ic? junction temperature cools by 15?, resulting in a pulsed output during continuous thermal-overload con- ditions. thermal-overload protection is designed to protect the max8880/max8881 in the event of fault conditions. for continuous operation, do not exceed the absolute maxi- mum junction temperature rating of t j(max) = +150?. operating region and power dissipation the max8880/max8881? maximum power dissipation depends on the thermal resistance of the case and cir- cuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipation in the device is p = i out (v in - v out ). the maximum power dissipation allowed is: in out fb gnd c2 4.7 f c1 1 f shdn 2.5v to 12v up to 200ma r3 r4 regulation ok pok max8880 v in v out 1.25v to 5.5v figure 3. adjustable output using external feedback resistors shutdown logic error amp 1.25v ref 91% ref p out pok gnd in shdn max8881 thermal sensor reverse battery protection mos driver with i limit pok fb figure 2. functional diagram
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok _______________________________________________________________________________________ 7 where t j(max) = +150?, t a is the ambient tempera- ture, jc is the thermal resistance from the junction to the case, and ca is the thermal resistance from the case through the pc board, copper traces, and other materials to the surrounding air. pok output the open-drain pok output is useful as a simple error flag, as well as a delayed reset output. pok sinks cur- rent when the output voltage is 10% below the regula- tion point. connect pok to out through a high-value resistor for a simple error flag indicator. connect a capacitor in parallel with the resistor to produce a delayed pok signal (delay set by the rc time con- stant). pok is low during out of regulation or in shut- down and is high impedance during normal operation. applications information capacitor selection and regulator stability the max8880/max8881 are designed to be stable with an output filter capacitor as low as 1f and an esr as high as 1 . for general purposes, use a 1f capacitor on the device? input and a 4.7? capacitor on the out- put. larger input capacitor values and lower esr pro- vide better supply-noise rejection and transient response. use a higher value input capacitor (10? may be necessary) if large, fast transients are anticipated and the device is located several inches from the power source. use large output capacitors to improve load- transient response, stability, and power-supply rejec- tion. note that some ceramic dielectric materials (e.g., z5u and y5v) exhibit a large temperature coefficient for both capacitance and esr, and a larger output capaci- tance may be needed to ensure stability at low tempera- tures. a 4.7? output capacitor with x7r or x5r dielectrics should be sufficient for stable operation over the full temperature range, with load currents up to 200ma. for load currents up to 40ma, 1f is accept- able. a graph of the region of stable c out esr vs. output current is shown in the typical operating characteristics . output voltage selection the max8881 features a preset output voltage. internal precision feedback resistors set the max8881eut18 out- put to 1.8v, the max8881eut25 output to 2.5v, the max8881eut33 output to 3.3v, and the max8881eut50 output to 5v. connect the max8881? fb to out for proper operation. the max8880 features an adjustable output voltage from 1.25v to 5.5v, using two external resistors con- nected as a voltage-divider to fb (figure 3). the output voltage is set by the following equation: where typically v fb = 1.257v. choose r4 = 1.2m to optimize quiescent current, accuracy, and high-fre- quency power-supply rejection. to simplify resistor selection: the total current through the external resistive feedback and load resistors should be greater than 1?. since the v fb tolerance is typically less than ?.5%, the output can be set using fixed resistors instead of trim pots. power-supply rejection and operation from sources other than batteries the max8880/max8881 are designed to deliver low- dropout voltages and low quiescent currents in battery- powered systems. power-supply rejection is -66db at low frequencies and rolls off with frequencies above 100hz. at high frequencies, the output capacitor is the major contributor to the rejection of power-supply noise (see power-supply rejection ratio vs. frequency in the typical operating characteristics ). when operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the value of the input and output capaci- tors and by using passive filtering techniques. the max8880/max8881 load-transient response graphs (see typical operating characteristics ) show the output response due to changing load current. reduce overshoot by increasing the output capacitor? value up to 10? and by reducing its esr. chip information transistor count: 134 rr v v out fb 34 1 =? ? ? ? ? ? ? vv r r out fb =+ ? ? ? ? ? ? 1 3 4 p tt max ja jc ca max () = ? () + () ?
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 8 _______________________________________________________________________________________ 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 .) 6lsot.eps package outline, sot 6l body 21-0058 2 1 i
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok _______________________________________________________________________________________ 9 package information (continued) (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 .) package outline, sot 6l body 21-0058 2 2 i
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 10 ______________________________________________________________________________________ package information (continued) (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 .) 6, 8, &10l, dfn thin.eps
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok ______________________________________________________________________________________ 11 package information (continued) (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 .) common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2
max8880/max8881 12v, ultra-low-i q , low-dropout linear regulators with pok 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. revision number revision date description pages changed 2 12/07 correction to pin description, updated package information, incorporated style changes 1, 5, 8?1 revision history

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