general description the max8510/max8511/max8512 ultra-low-noise, low-dropout (ldo) linear regulators are designed to deliver up to 120ma continuous output current. these regula- tors achieve a low 120mv dropout for 120ma load cur- rent. the max8510 uses an advanced architecture to achieve ultra-low output voltage noise of 11? rms and psrr of 54db at 100khz.the max8511 does not require a bypass capacitor, hence achieving the smallest pc board area. the max8512? output voltage can be adjusted with an external divider. the max8510/max8511 are preset to a variety of volt- ages in the 1.5v to 4.5v range. designed with a p-channel mosfet series pass transistor, the max8510/max8511/ max8512 maintain very low ground current (40?). the regulators are designed and optimized to work with low-value, low-cost ceramic capacitors. the max8510 requires only 1? (typ) of output capacitance for stability with any load. when disabled, current consumption drops to below 1?. package options include a 5-pin sc70 and a tiny 2mm x 2mm x 0.8mm tdfn package. applications cellular and cordless phonespda and palmtop computers base stations bluetooth portable radios and accessories wireless lans digital cameras personal stereos portable and battery-powered equipment features ? space-saving sc70 and tdfn (2mm x 2mm) packages ? 11 v rms output noise at 100hz to 100khz bandwidth (max8510) ? 78db psrr at 1khz (max8510) ? 120mv dropout at 120ma load ? stable with 1 f ceramic capacitor for any load ? guaranteed 120ma output ? only need input and output capacitors (max8511) ? output voltages: 1.5v, 1.8v, 2.5v, 2.6v, 2.7v, 2.8v, 2.85v, 3v, 3.3v, 4.5v (max8510/max8511) and adjustable (max8512) ? low 40 a ground current ? excellent load/line transient ? overcurrent and thermal protection max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators ___________________________________________________ _____________ maxim integrated products 1 bp (max8510) n.c. (max8511) fb (max8512) gnd bp (max8510) n.c. (max8511) fb (max8512) shdn 12 3 54 out in max8510 max8511 max8512 max8510 max8511 max8512 sc70 *connect ep to gnd. 127 3 4 + + n.c. gnd n.c.n.c. out ep* tdfn 2mm 2mm 86 5 top view shdn pin configuration ordering information max8510 output preset 1.5v to 4.5v in input2v to 6v off shdn c bp = 10nf c out = 1 f c in = 1 f out on bp gnd typical operating circuits 19-2732; rev 4; 8/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. * xy is the output voltage code (see output voltage selector guide). other versions between 1.5v and 4.5v are available in 100mv increments. contact factory for other versions. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. part* temp range pin-package max8510 exkxy+t -40? to +85? 5 sc70-5 typical operating circuits continued at end of data sheet. output voltage selector guide appears at end of data sheet. ordering information continued at end of data sheet. downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v in = v out + 0.5v, t a = -40? to +85?, unless otherwise noted. c in = 1?, c out = 1?, c bp = 10nf. typical values are at +25?; the max8512 is tested with 2.45v output, unless otherwise noted.) (note 2) 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. in to gnd .................................................................-0.3v to +7v output short-circuit duration ............................................infinite out, shdn to gnd ......................................-0.3v to (in + 0.3v) fb, bp, n.c. to gnd..................................-0.3v to (out + 0.3v) continuous power dissipation (t a = +70?) 5-pin sc70 (derate 3.1mw/? above +70?) ..............0.247w 8-pin tdfn (derate 11.9mw/? above = 70?) ..........0.953w operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65 c to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units input voltage range v in 26 v i out = 1ma, t a = +25? -1 +1 i out = 100? to 80ma, t a = +25? -2 +2 output voltage accuracy i out = 100? to 80ma -3 +3 % maximum output current i out 120 ma current limit i lim v out = 90% of nominal value 130 200 300 ma v out 3v, i out = 80ma 80 170 v out 3v, i out = 120ma 120 2.5v v out < 3v, i out = 80ma 90 200 2.5v v out < 3v, i out = 120ma 135 2v v out < 2.5v, i out = 80ma 120 250 dropout voltage (note 3) 2v v out < 2.5v, i out = 120ma 180 mv i out = 0.05ma 40 90 ground current i q v in = v out (nom) - 0.1v, i out = 0ma 220 500 ? line regulation v lnr v in = (v out + 0.5v) to 6v, i out = 0.1ma 0.001 %/v load regulation v ldr i out = 1ma to 80ma 0.003 %/ma t a = +25? 0.003 1 shutdown supply current i shdn v shdn = 0v t a = +85? 0.05 ? max8510 78 f = 1khz, i out = 10ma max8511/max8512 72 max8510 75 f = 10khz, i out = 10ma max8511/max8512 65 max8510 54 ripple rejection psrr f = 100khz, i out = 10ma max8511/ max8512 46 db package thermal characteristics (note 1) sc70 junction-to-ambient thermal resistance ( ja )...............324?/w junction-to-case thermal resistance ( jc )....................115?/w tdfn junction-to-ambient thermal resistance ( ja ).................83.9?/w junction-to-case thermal resistance ( jc ).........................37?/w 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.maxim-ic.com/thermal-tutorial . downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators ___________________________________________________ ____________________________________ 3 electrical characteristics (continued) (v in = v out + 0.5v, t a = -40? to +85?, unless otherwise noted. c in = 1?, c out = 1?, c bp = 10nf. typical values are at +25?; the max8512 is tested with 2.45v output, unless otherwise noted.) (note 2) note 2: limits are 100% tested at +25?. limits over operating temperature range are guaranteed by design. note 3: dropout is defined as v in - v out when v out is 100mv below the value of v out for v in = v out + 0.5v. note 4: time needed for v out to reach 90% of final value. parameter symbol conditions min typ max units max8510 11 f = 100hz to 100khz,i load = 10ma max8511/max8512 230 max8510 13 output noise voltage(rms) f = 100hz to 100khz,i load = 80ma max8511/max8512 230 ? shutdown exit delay r load = 50 (note 4) 300 ? shdn logic low level v in = 2v to 6v 0.4 v shdn logic high level v in = 2v to 6v 1.5 v t a = +25? shdn input bias current v in = 6v, v shdn = 0v or 6v t a = +85? 0.01 ? t a = +25? 0.006 0.1 fb input bias current(max8512) v in = 6v,v fb = 1.3v t a = +85? 0.01 ? thermal shutdown 160 ? thermal-shutdownhysteresis 10 ? typical operating characteristics (v in = v out + 0.5v, c in = 1?, c out = 1?, c bp = 10nf, t a = +25?, unless otherwise noted.) max8510 output voltage vs. input voltage max8510 toc01 input voltage (v) output voltage (v) 5 4 3 2 1 0.5 1.0 1.5 2.0 2.5 3.00.0 06 i out = 120ma i out = 0ma max8510 output voltage accuracy vs. load current max8510 toc02 load current (ma) % deviation (%) 100 80 60 40 20 -0.4 -0.2 0 0.2 0.4 0.6 -0.6 0 120 max8510 output voltage accuracy vs. temperature max8510 toc03 temperature ( c) % deviation (%) 60 35 10 -15 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 -40 85 i out = 1ma downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators 4 __________________________________________________ _____________________________________ typical operating characteristics (continued) (v in = v out + 0.5v, c in = 1?, c out = 1?, c bp = 10nf, t a = +25?, unless otherwise noted.) max8510 dropout voltage vs. load current max8510 toc04 load current (ma) dropout voltage (mv) 100 80 60 40 20 30 60 90 120 150 0 0 120 t a = +85 c t a = +25 c t a = -40 c max8510 dropout voltage vs. output voltage max8510 toc05 output (v) dropout voltage (mv) 3.0 2.8 2.6 2.4 2.2 50 100 150 200 250 0 2.0 3.2 i out = 80ma max8510 ground pin current vs. input voltage max8510 toc06 input voltage (v) ground pin current ( a) 4 3 2 1 150 200 50 100 250 300 350 0 05 i out = 120ma i out = 0ma max8510 ground pin current vs. load current max8510 toc 07 load current (ma) ground pin current ( a) 100 80 60 40 20 40 80 120 160 200 240 0 0 120 v in = 3.8v v in = 5.5v max8510 ground pin current vs. temperature max8510 toc08 temperature ( c) ground pin current ( a) 60 35 10 -15 35 40 45 5030 -40 85 max8510 psrr vs. frequency max8510 toc09 frequency (khz) psrr (db) 1 10 100 0.1 40 50 6010 20 30 70 80 90 0 0.01 1000 i load = 10ma c bp = 10nf max8511 psrr vs. frequency max8510 toc10 frequency (khz) psrr (db) 0.1 1 10 100 40 50 6010 20 30 70 80 90 0 0.01 1000 i load = 10ma max8510 output noise max8510 toc11 400 s/div v in = 3.8v i load = 10ma v noise = 11 v rms 20 v/div max8510 output noise spectral density vs. frequency max8510 toc12 frequency (khz) output noise density (nv/ hz ) 0.1 1 10 100 1.e+031.e+02 1.e+041.e+01 0.01 1000 downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v in = v out + 0.5v, c in = 1?, c out = 1?, c bp = 10nf, t a = +25?, unless otherwise noted.) max8510 output noise vs. bp capacitance max8510 toc13 bp capacitance (nf) output noise ( v) 10 5 10 15 20 25 0 1 100 max8510 load transient response max8510 toc14 1ms/div v in = 3.5v i load = 0 to 50ma v out 10mv/div max8510 load transient response near dropout max8510 toc15 1ms/div v in = 3.1v i load = 0 to 50ma v out 10mv/div max8510 line transient response max8510 toc16 200 s/div v in = 3.5v to 4v v out 2mv/div max8510 exiting shutdown waveform max8510 toc17 20 s/div v out = 2.85v r load = 47 output voltage2v/div shutdown voltage max8510 entering shutdown delay max8510 toc18 40 s/div c bp = 0.01 f output voltage2v/div shutdown voltage max8510 shutdown exit delay max8510 toc19 20 s/div v out 1v/div shutdown voltage v out = 3v c bp = 100nf max8510 region of stable c out esr vs. load current max8510 toc20 load current (ma) c out esr ( ) 80 60 40 20 0.1 1 10 100 0.01 01 2 0 100 stable region downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators 6 __________________________________________________ _____________________________________ detailed description the max8510/max8511/max8512 are ultra-low-noise,low-dropout, low-quiescent current linear regulators designed for space-restricted applications. the parts are available with preset output voltages ranging from 1.5v to 4.5v in 100mv increments. these devices can supply loads up to 120ma. as shown in the functional diagram , the max8510/max8511 consist of an innova- tive bandgap core and noise bypass circuit, erroramplifier, p-channel pass transistor, and internal feed- back voltage-divider. the max8512 allows for adjustable output with an external feedback network. the 1.225v bandgap reference is connected to the error amplifier? inverting input. the error amplifier com- pares this reference with the feedback voltage and amplifies the difference. if the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled low. this allows more current to pass to the output and increases the output voltage. if the feed- back voltage is too high, the pass transistor gate ispulled high, allowing less current to pass to the output. the output voltage is fed back through an internal resis- tor voltage-divider connected to the out pin. an external bypass capacitor connected to bp (max8510) reduces noise at the output. additional blocks include a current limiter, thermal sensor, and shutdown logic. internal p-channel pass transistor the max8510/max8511/max8512 feature a 1 (typ) p-channel mosfet pass transistor. this provides seve-ral advantages over similar designs using a pnp pass transistor, including longer battery life. the p-channel mosfet requires no base drive, which considerably reduces quiescent current. pnp-based regulators waste considerable current in dropout when the pass transis- tor saturates. they also use high base-drive current under heavy loads. the max8510/max8511/max8512 do not suffer from these problems and consume only 40? of quiescent current in light load and 220? in dropout (see the typical operating characteristics ). output voltage selection the max8510/max8511 are supplied with factory-setoutput voltages from 1.5v to 4.5v, in 100mv increments (see ordering information ). the max8512 features a user-adjustable output through an external feedbacknetwork (see the typical operating circuits ). to set the output of the max8512, use the followingequation: where r2 is chosen to be less than 240k and v ref = 1.225v. use 1% or better resistors. rrx v v out ref 12 1 = ? ? ? ? ? ? - pin description pin max8510 max8511 max8512 sc70 tdfn -ep sc70 tdfn -ep sc70 tdfn -ep name function 151515i n unregulated input supply 232323 gnd ground 343434 shdn shutdown. pull low to disable the regulator. 4 2 b p noise bypass for low-noise operation. connect a 10nf capacitorfrom bp to out. bp is shorted to out in shutdown mode. 4 2 fb adjustable output feedback point 575757 out reg ul ated outp ut v ol tag e. byp ass w i th a cap aci tor to gn d . s ee the c ap aci tor s el ecti on and reg ul ator s tab i l i ty secti on for m or e d etai l s. 1, 6, 8 4 1, 2, 6, 1, 6, 8 n.c. no connection. not internally connected. e p exposed pad (tdfn only). internally connected to gnd. connectto a large ground plane to maximize thermal performance. not intended as an electrical connection point. downloaded from: http:///
max8510/max8511/max8512 shutdown the max8510/max8511/max8512 feature a low-powershutdown mode that reduces quiescent current less than 1?. driving shdn low disables the voltage refer- ence, error amplifier, gate-drive circuitry, and passtransistor (see the functional diagram ), and the device output enters a high-impedance state. connect shdn to in for normal operation. current limit the max8510/max8511/max8512 include a currentlimiter, which monitors and controls the pass transis- tor? gate voltage, limiting the output current to 200ma. for design purposes, consider the current limit to be 130ma (min) to 300ma (max). the output can be shorted to ground for an indefinite amount of time without dam- aging the part. thermal-overload protection thermal-overload protection limits total power dissipationin the max8510/max8511/max8512. when the junction temperature exceeds t j = +160?, the thermal sensor signals the shutdown logic, turning off the pass transistorand allowing the ic to cool down. the thermal sensor turns the pass transistor on again after the ic? junction temperature drops by 10?, resulting in a pulsed output during continuous thermal-overload conditions. thermal-overload protection is designed to protect the max8510/max8511/max8512 in the event of a fault con- dition. for continual operation, do not exceed the absolute maximum junction temperature rating of t j = +150?. operating region and power dissipation the max8510/max8511/max8512 maximum powerdissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient, and the rate of airflow. the power dissipation across the device is: p = i out (v in - v out ) the maximum power dissipation is: p max = (t j - t a ) / ( jc + ca ) where t j - t a is the temperature difference between the max8510/max8511/max8512 die junction and thesurrounding air, jc is the thermal resistance of the package, and ca is the thermal resistance through the pc board, copper traces, and other materials to thesurrounding air. the gnd pin of the max8510/max8511/max8512 per- forms the dual function of providing an electrical connec- tion to ground and channeling heat away. connect the gnd pin to ground using a large pad or ground plane. noise reduction for the max8510, an external 0.01? bypass capacitorbetween bp and out with innovative noise bypass scheme reduces output noises dramatically, exhibiting 11? rms of output voltage noise with c bp = 0.01? and c out = 1?. startup time is minimized by a power- on circuit that precharges the bypass capacitor. applications information capacitor selection and regulator stability use a 1? capacitor on the max8510/max8511/max8512 input and a 1? capacitor on the output. larger input capacitor values and lower esrs provide better noise rejection and line-transient response. reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. note that some ceramic dielectrics exhibit large capacitance and esr variation with temperature. with dielectrics such as z5u and y5v, it may be necessary to use a 2.2? or larger output capacitor to ensure stability at temperatures below -10?. with x7r or x5r dielectrics, 1? is sufficient at all operating temperatures. a graph of the region of stable c out esr vs. load current is shown in the typical operating characteristics . use a 0.01? bypass capacitor at bp (max8510) forlow-output voltage noise. the leakage current going into the bp pin should be less than 10na. increasing the capacitance slightly decreases the output noise. values above 0.1? and below 0.001? are not recommended. noise, psrr, and transient response the max8510/max8511/max8512 are designed todeliver ultra-low noise and high psrr, as well as low dropout and low quiescent currents in battery-powered systems. the max8510 power-supply rejection is 78db at 1khz and 54db at 100khz. the max8511/max8512 psrr is 72db at 1khz and 46db at 100khz (see the power-supply rejection ratio vs. frequency graph in the typical operating characteristics) . when operating from sources other than batteries,improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors, and through passive fil- tering techniques. the typical operating characteristics show the max8510/max8511/max8512 line- and load-transient responses. ultra-low-noise, high psrr, low-dropout, 120ma linear regulators ___________________________________________________ ____________________________________ 7 downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators 8 __________________________________________________ _____________________________________ p outfb*** *max8510 only**max8510/max8511 only ***max8512 only ** ** bp* max8510max8511 max8512 error amp in shdn gnd shutdown and power-on control thermal sensor mos driver with i limit 1.225v reference and noise bypass functional diagram dropout voltage a regulator? minimum dropout voltage determines thelowest usable supply voltage. in battery-powered sys- tems, this determines the useful end-of-life battery volt- age. because the max8510/max8511/max8512 use a p-channel mosfet pass transistor, their dropout volt-age is a function of drain-to-source on-resistance (rds(on)) multiplied by the load current (see the typical operating characteristics ). downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma linear regulators ___________________________________________________ ____________________________________ 9 chip information process: bicmos max8511 output preset 1.5v to 4.5v in input2v to 6v off shdn c out = 1 f c in = 1 f out on gnd typical operating circuits (continued) output voltage selector guide part v out (v) top mark max8510exk16+t 1.6 aex max8510exk18+t 1.8 ath max8510eta25+t 2.5 aao max8510exk27+t 2.7 atd max8510eta28+t 2.8 aar max8510exk29+t 2.85 ads max8510eta30+t 3 aas max8510eta33+t 3.3 aat max8510eta45+t 4.5 aau max8511exk15+t 1.5 adu max8511eta18+t 1.8 aav max8511eta25+t 2.5 aap max8511eta26+t 2.6 aaw max8511exk28+t 2.8 afa max8511eta29+t 2.85 aax max8511exk89+t 2.9 aeh max8511exk31+t 3.1 ars max8511eta33+t 3.3 aay max8511exk45+t 4.5 aej max8512eta+t adjustable aaq max8512 output adjustable 1.5v to 4.5v in input2v to 6v off shdn r1r2 c out = 1 f c in = 1 f out on fb gnd ( note: standard output voltage options, shown in bold , are available. contact the factory for other output voltages between 1.5v and 4.5v. minimum order quantity is 15,000 units.) ordering information (continued) * xy is the output voltage code (see output voltage selector guide). other versions between 1.5v and 4.5v are available in 100mv increments. contact factory for other versions. **ep = exposed pad. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. part* temp range pin-package max8510exkxy+t -40? to +85? 5 sc70 max8510etaxy+t -40? to +85? 8 tdfn-ep**2mm x 2mm max8511exkxy+t -40? to +85? 5 sc70 max8511etaxy+t -40? to +85? 8 tdfn-ep**2mm x 2mm max8512exk+t -40? to +85? 5 sc70 max8512eta+t -40? to +85? 8 tdfn-ep**2mm x 2mm package information for the latest package outline information and land patterns(footprints), 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 the package regardless of rohs status. package type package code outline no. land pattern no. 8 tdfn t822+1 21-0168 90-0064 5 sc70 x5+1 21-0076 90-0188 downloaded from: http:///
max8510/max8511/max8512 ultra-low-noise, high psrr, low-dropout, 120ma 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. 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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 4 8/11 corrected errors and added lead-free packages 1, 2, 3, 6, 9 downloaded from: http:///
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