View MAX8559ETAGGT_8526737.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max8559 dual, low-noise, low-dropout (ldo) linearregulator operates from a 2.5v to 6.5v input voltage and delivers at least 300ma of continuous output cur- rent. it offers low output noise and low dropout of only 60mv at 100ma. typical output noise for this device is 32? rms , and psrr is 70db at 10khz. designed with an internal p-channel mosfet pass transistor, the max8559 maintains a low 115? supply current per ldo, independent of the load current and dropout volt- age. other features include short-circuit protection and thermal-shutdown protection. the max8559 includes two independent logic-controlled shutdown inputs and is capable of operating without a bypass capacitor to further reduce total solution size. the max8559 is avail- able in a miniature 8-bump ucsp (2mm x 1mm) or 8-pin tdfn (3mm x 3mm) package. applications cellular and cordless phonespdas and palmtop computers notebook computers digital cameras pcmcia cards wireless lan cards handheld instruments features ? two low-dropout-voltage regulators ? low 32v rms output noise ? 300ma output current for each ldo ? 70db psrr at 10khz ? independent shutdown controls ? low 60mv dropout at 100ma load ? 115a operating supply current per ldo ? 1.5v to 3.3v factory-preset output ? small ceramic output capacitors ? output current limit ? thermal-overload and short-circuit protection ? 1.95w power-dissipation capability (tdfn) ? 2mm 2 footprint (ucsp) max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn ________________________________________________________________ maxim integrated products 1 ordering information on off on off max8559 input 2.5v to 6.5v 2.2 f min inb shdna shdnb ina gnd outb outa bp 0.01 f (optional) 2.2 f/150ma 4.7 f/300ma 1.5v to 3.3v 2.2 f/150ma 4.7 f/300ma 1.5v to 3.3v typical operating circuit 19-3121; rev 2; 8/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part temp range pin-package max8559ebaxy*-t -40 c to +85 c 8 ucsp (b8-1) max8559ebaxy*+t -40 c to +85 c 8 ucsp (b8-1) max8559etaxy*-t -40 c to +85 c 8 tdfn-ep** max8559etaxy*+t -40 c to +85 c 8 tdfn-ep** * xy = output voltage code (see the output voltage selector guide). ** ep = exposed pad. + denotes lead-free package. output voltage selector guide appears at end of data sheet. pin configurations gnd outb inb 2 outa bp shdna shdnb ina tdfn 3mm x 3mm 3 4 max8559eta 8 76 5 top view a "+" sign will replace the first pin indicator on lead-free packages. pin configurations continued at end of data sheet. ucsp is a trademark of maxim integrated products, inc. downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 2 _______________________________________________________________________________________ absolute maximum ratings 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. ina, inb, shdna , shdnb , bp to gnd ...................-0.3v to +7v ina to inb..............................................................-0.3v to +0.3v outa, outb to gnd ..................................-0.3v to (v in + 0.3v) output short-circuit duration.....................................continuous continuous power dissipation (t a = +70?) 8-bump ucsp (derate 4.7mw/? above +70?)..........379mw 8-pin tdfn (derate 24.4mw/? above +70?) ..........1951mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? 8-pin tdfn lead temperature (soldering, 10s)..............+300? 8-bump ucsp solder profile...........................................(note 1) electrical characteristics(v in = 3.8v, shdna = shdnb = in_, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units input voltage v in 2.5 6.5 v undervoltage-lockout threshold v uvlo v in rising, hysteresis is 40mv (typ) 2.15 2.35 2.45 v t a = +25 c, i outa = i outb = 1ma -1 +1 t a = -40 c to +85 c, i outa = i outb = 1ma -2 +2 output voltage accuracy t a = -40 c to +85 c, i outa or i outb = 0.1ma to 300ma -3 +3 % maximum output current i out_ 300 ma output current limit i lim_ 310 550 920 ma no load 180 290 no load, one ldo shutdown 115 ground current i q i outa = i outb = 100ma 220 ? i out_ = 1ma 0.6 dropout voltage(note 2) v out_ - v in_ i out_ = 100ma 60 120 mv line regulation ? v lnr v in_ = (v out_ + 0.1v) to 6.5v, i out_ = 1ma -0.15 0 +0.15 %/ v 100hz to 100khz, c out_ = 10?, i out_ = 1ma, c bp = 0.01? 32 output voltage noise 100hz to 100khz, c out_ = 10?, i out_ = 1ma, c bp = not installed 254 ? rms 10khz 70 power-supply ripple rejection psrr v in_ = v out_ + 1v, c bp = 0.01?, c out_ = 2.2?, i out_ = 50ma 100khz 54 db shutdown t a = +25 c 0.01 1 shutdown supply current i shdn shdn_ = 0v t a = -40 c to +85 c 0.1 ? v ih input high voltage 1.6 shdn input threshold v il input low voltage 0.4 v note 1: for ucsp solder profile information, please refer to the application note app_1891 on the maxim website, www.maxim-ic.com. downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn _______________________________________________________________________________________ 3 electrical characteristics (continued)(v in = 3.8v, shdna = shdnb = in_, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units t a = +25? 10 100 shdn input bias current i shdn shdn_ = in or gnd t a = -40 c to +85 c 100 na v out_ discharge resistance in shutdown shdn_ = gnd 385 thermal protection thermal-shutdown temperature t shdn t j rising +160 c thermal-shutdown hysteresis ? t shdn 10 c note 1: all units are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design. note 2: the dropout voltage is defined as v in - v out when v out is 100mv below the nominal value of v out . specification only applies when v out 2.5v. typical operating characteristics (v outa = v outb = 2.85v, v ina = v inb = 3.8v, c out = 2.2? (or 4.7? for 300ma), c bp = 0.01?, and c in = 2.2? (or 4.7? for 300ma), unless otherwise noted.) 0 100 50 200150 250 300 03 4 12 56 ground current vs. supply voltage max8559 toc01 supply voltage (v) ground current ( a) 100ma load, both outputs no load, both outputs 0 5025 125100 75 200175 150 225 0 100 50 150 200 250 300 ground current vs. load current max8559 toc02 load current (ma) ground current ( a) both outputs loaded 0 7550 25 100 125 150 175 200 225 250 -40 10 -15 35 60 85 ground current vs. temperature max8559 toc03 temperature ( c) ground current ( a) 100ma load, both outputs no load, both outputs downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 4 _______________________________________________________________________________________ 0 6040 20 80 100 120 140 160 180 200 0 100 50 150 200 300 dropout voltage vs. load current max8559 toc04 load current (ma) dropout voltage (mv) 250 -0.7 -0.5-0.6 -0.3-0.4 -0.1-0.2 0 0 100 150 50 200 250 300 output voltage accuracy vs. load current max8559 toc05 load current (ma) output voltage accuracy (%) -0.6 -0.3-0.4 -0.5 -0.2 -0.1 0 0.1 0.2 0.3 0.4 -40 10 -15 35 60 85 output voltage accuracy vs. temperature max8559 toc06 temperature ( c) output voltage accuracy (%) 100ma load, both outputs 100ma load, both outputs psrr vs. frequency max8559 toc07 frequency (khz) psrr (db) 100 10 0.1 1 10 20 30 40 50 60 70 80 0 0.01 1000 i outa = 50ma channel-to-channel isolation vs. frequency max8559 toc08 frequency (khz) channel-to-channel isolation (db) 100 10 1 0.1 10 20 30 40 50 60 70 80 90 100 0 0.01 1000 i outa = 10ma output-noise spectral density vs. frequency max8559 toc09 frequency (khz) noise density (nv/ hz) 10 1 0.1 100 1000 10,000 10 0.01 100 r load = 100 typical operating characteristics (continued) (v outa = v outb = 2.85v, v ina = v inb = 3.8v, c out = 2.2? (or 4.7? for 300ma), c bp = 0.01?, and c in = 2.2? (or 4.7? for 300ma), unless otherwise noted.) downloaded from: http:///
40 s/div line transient v outa 10mv/divac-coupled max8559 toc11 v ina 4.5v 3.5v 1v/div i outa = 100ma 10 s/div load transient i outa 100ma/div max8559 toc12 v outa 20mv/divac-coupled 0 max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn _______________________________________________________________________________________ 5 10 s/div load transient near dropout i outa 100ma/div max8559 toc13 v outa 20mv/divac-coupled 0 1ms/div shutdown response v shdna 1v/div max8559 toc14 v outa 1v/div 0 0 typical operating characteristics (continued) (v outa = v outb = 2.85v, v ina = v inb = 3.8v, c out = 2.2? (or 4.7? for 300ma), c bp = 0.01?, and c in = 2.2? (or 4.7? for 300ma), unless otherwise noted.) 1ms/div output noise (10hz to 100khz) v out_ 500 v/div max8559 toc10 downloaded from: http:///
max8559 detailed description the max8559 is a dual, low-noise, low-dropout, low-qui- escent-current linear regulator designed primarily for battery-powered applications. the regulators are avail- able with preset 1.5v to 3.3v output voltages. these out- puts can supply loads up to 300ma with a 4.7? output capacitor, or up to 150ma with a 2.2? output capacitor. as illustrated in the functional diagram , the max8559 consists of a 1.25v reference, error amplifiers, p-chan- nel pass transistors, internal feedback voltage-dividers, and autodischarge circuitry. feedback control loop the 1.25v bandgap reference is connected to the erroramplifier? inverting input. the error amplifier compares 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 lower, allowing more current to pass to the output andincreasing the output voltage. if the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. the output voltage is fed back through an internal resistor voltage-divider connected to out_. internal p-channel pass transistor the max8559 features two 0.6 p-channel mosfet pass transistors. a p-channel mosfet provides sever-al advantages over similar designs using pnp pass transistors, including longer battery life. it requires no base drive, reducing quiescent current considerably. pnp-based regulators waste considerable current in dropout when the pass transistor saturates, and they also use high base-drive currents under large loads. the max8559 does not suffer from these problems, and with both outputs on it only consumes 180? of dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 6 _______________________________________________________________________________________ pin description pin tdfn ucsp name function 1 a1 ina ldo a regulator input. connect to inb. input voltage can range from 2.5v to 6.5v. bypass inawith a ceramic capacitor to gnd (see the capacitor selection and regulator stability section). 2a 2 shdna shutdown a input. a logic-low on shdna shuts down regulator a. if shdna and shdnb are both low, both regulators and the internal reference are off and the supply current is reduced to 10na (typ). if either shdna or shdnb is a logic high, the internal reference is on. connect shdna to ina for always-on operation of regulator a. 3a 3 shdnb shutdown b input. a logic-low on shdnb shuts down regulator b. if shdna and shdnb are both low, both regulators and the internal reference are off and the supply current is reduced to 10na (typ). if either shdna or shdnb is a logic high, the internal reference is on. connect shdnb to inb for always-on operation of regulator b. 4 a4 inb ldo b regulator input. connect to ina. input voltage can range from 2.5v to 6.5v. bypass inbwith a ceramic capacitor to gnd (see the capacitor selection and regulator stability section). 5 b4 outb regulator b output. outb can source up to 300ma continuous current. bypass outb with aceramic capacitor to gnd (see the capacitor selection and regulator stability section). during shutdown, outb is internally discharged to gnd through a 385 resistor. 6 b3 gnd ground 7b 2b p reference noise bypass. bypass bp with a low-leakage 0.01? ceramic capacitor for reducednoise at both outputs. 8 b1 outa regulator a output. outa can source up to 300ma continuous current. bypass outa with a ceramic capacitor to gnd (see the capacitor selection and regulator stability section). during shutdown, outb is internally discharged to gnd through a 385 resistor. ep exposed paddle connect to ground plane. ep also functions as a heatsink. solder to the circuit-board ground plane to maximize thermal dissipation. downloaded from: http:///
quiescent current at no load and 220? with 100maload current on both outputs (see the typical operating characteristics ). a pnp-based regulator has a high dropout voltage that is independent of the load. a p-channel mosfet? dropout voltage is proportional to load current, providing for low dropout voltage at heavy loads and extremely low dropout at lighter loads. current limit the max8559 contains two independent current lim- iters, one for each regulator output, monitoring and controlling the pass transistor? gate voltage and limit- ing the output current to 310ma (min). the outputs can be shorted to ground continuously without damaging the part. low-noise operation an external 0.01? bypass capacitor at bp in conjunc-tion with an internal resistor creates a lowpass filter. the max8559 exhibits less than 32? rms of output voltage noise with c bp = 0.01? and c out = 10?. the typical operating characteristics show a graph of output-noise spectral density with these values. if out-put noise is not critical, the bp capacitor can be removed to reduce total solution size and cost. shutdown the max8559 has independent shutdown controlinputs ( shdna and shdnb ). drive shdna low to shut down outa. drive shndb low to shut down outb. drive both shdna and shdnb low to shut down the entire chip, reducing supply current to 0.01?. connectshdna or shdnb to a logic high or in_ for always-on operation of the corresponding ldo. each ldo outputis internally discharged to ground through a 385 resistor in shutdown mode. thermal-overload protection thermal-overload protection limits total power dissipa- tion in the max8559. each regulator has its own inde- pendent thermal detector. when one of the regulators junction temperature exceeds t j = +160?, that regu- lator? pass transistor is turned off allowing the ic tocool. the thermal sensor turns the pass transistor on again after the ic? junction temperature cools by 10?. this results in a pulsed output during continuous ther- mal-overload conditions. operating region and power dissipation the max8559 maximum power dissipation depends onthe thermal resistance of the case and the circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipa- tion across the device is p = i out x (v in - v out ). the maximum power dissipation allowed is: p max = (t j - t a ) / (r jb + r ba ) where t j - t a is the temperature difference between the max8559 die junction and the surrounding air,r jb (r jc ) is the thermal resistance of the package, and r ba is the thermal resistance through the printed circuit board, copper traces, and other materials to thesurrounding air. the exposed paddle of the tdfn package performs the function of channeling heat away. connect the exposed paddle to the board ground plane. applications information capacitor selection and regulator stability for load currents up to 150ma, use a single 2.2? capacitor to bypass both inputs of the max8559 and a 2.2? capacitor to bypass each output. larger input- capacitor values and lower esrs provide better supply- noise rejection and line-transient response. to reduce output noise and improve load-transient voltage dips, use larger output capacitors up to 10?. for stable oper- ation over the full temperature range with load currents up to 300ma, input and output capacitors should be a minimum of 4.7?. note that some ceramic dielectrics exhibit large capaci- tance and esr variation with temperature. with dielectrics such as z5u and y5v, it may be necessary to use 4.7? or more for up to 150ma load current to ensure stability at temperatures below -10?. with x7r or x5r dielectrics, 2.2? is sufficient at all operating tem- peratures. these regulators are optimized for ceramic capacitors. tantalum capacitors are not recommended. use a 0.01? bypass capacitor at bp for low-output volt- age noise. increasing the capacitance slightly decreas- es the output noise, but increases the startup time. psrr and operation from sources other than batteries the max8559 is designed to deliver low-dropout volt- ages and low quiescent currents in battery-powered systems. power-supply rejection ratio is 70db at 10khz (see power-supply rejection ratio vs. frequency in the typical operating characteristics ). when operat- ing from sources other than batteries, improved sup- ply-noise rejection and transient response is achieved by increasing the values of the input and output bypass capacitors and through passive rc or crc fil- tering techniques. max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn _______________________________________________________________________________________ 7 downloaded from: http:///
max8559 load-transient considerations the max8559 load-transient response graphs (see the typical operating characteristics ) show two compo- nents of the output response: a dc shift in the outputvoltage due to the different load currents and the tran- sient response. typical overshoot for step changes in the load current from 10? to 100ma is 15mv. increase the output capacitor? value and decrease its esr to attenuate transient spikes. dropout voltage a regulator? minimum input-output voltage differential (or dropout voltage) determines the lowest usable sup- ply voltage. in battery-powered systems, this determines the useful end-of-life battery voltage. because the max8559 uses an internal p-channel mosfet pass transistor, its dropout voltage is a function of the drain- to-source on-resistance (r ds(on) ) multiplied by the load current (see the typical operating characteristics ). calculating the maximum output power in ucsp the maximum output power of the max8559 is limitedby the maximum power dissipation of the package. by calculating the power dissipation of the package as a function of the input voltage, output voltages, and out- put currents, the maximum input voltage can be obtained. the maximum power dissipation should not exceed the package? maximum power rating. p = (v in(max) - v outa ) x i outa + ( vin(max) - v outb ) x i outb where:v in(max) = maximum input voltage p max = maximum power dissipation of the package (379mw for the ucsp and 1951mw for the tdfn)v outa = output voltage of outa v outb = output voltage of outb i outa = maximum output current of outa i outb = maximum output current of outb p should be less than p max . if p is greater than p max , consider the tdfn. layout guidelines due to the low output noise and tight output voltageaccuracy required by most applications, careful pc board layout is required. an evaluation kit (max8559evkit) is available to speed design. follow these guidelines for good pc board layout: keep the input and output paths short and wide if possible, especially at the ground terminals. use thick copper pc boards (2oz vs. 1oz) to enhance thermal capabilities. place output, input, and bypass capacitors as close as possible to the ic. ensure traces to bp and the bp capacitor are away from noisy sources to ensure low output voltage noise. dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 8 _______________________________________________________________________________________ downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn _______________________________________________________________________________________ 9 ina shdna shdnb shutdown and power-on control thermal sensor 1.25v ref gnd inb ldob outb bp outa ldoa shdna p mos driver with i limit error amp max8559 functional diagram downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 10 ______________________________________________________________________________________ output voltage selector guide part v outa (x) v outb (y) top mark max8559eba8a 1.50 3.30 aae max8559eba2g 1.80 3.00 aaf max8559eba11 1.85 1.85 aak max8559ebap2 2.50 1.80 aag max8559ebak2 2.80 1.80 aah max8559ebajj 2.85 2.85 aac max8559ebajg 2.85 3.00 aai max8559ebaii 2.90 2.90 aab max8559ebag2 3.00 1.80 aaj max8559ebagj 3.00 2.85 aad max8559ebagg 3.00 3.00 aaa max8559ebaaa 3.30 3.30 aal max8559eta88 1.50 1.50 aol max8559eta8a 1.50 3.30 aim max8559eta22 1.80 1.80 api max8559eta2g 1.80 3.00 alk max8559eta11 1.85 1.85 aov max8559etap2 2.50 1.80 all max8559etao1 2.60 1.85 apj max8559etak2 2.80 1.80 alm max8559etakg 2.80 3.00 ain max8559etaj2 2.85 1.80 ald max8559etajj 2.85 2.85 aig max8559etajg 2.85 3.00 aln max8559etaii 2.90 2.90 aif max8559etag2 3.00 1.80 alo max8559etagg 3.00 3.00 aie max8559etaao 3.30 2.60 apk max8559etaaj 3.30 2.85 aom max8559etaaa 3.30 3.30 apd pin configurations (continued) top view ucsp (2.06mm x 1.03mm) max8559eba gnd outb inb outa bp shdna shdnb ina a1 a2 a3 a4 b1 b2 b3 b4 a "+" sign will replace the first pin indicator on lead-free packages. chip information transistor count: 634process: bicmos note: standard output voltage options, shown in bold, are available. contact the factory for other output voltages between1.5v and 3.3v. minimum order quantity is 15,000 units. downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulator with independent shutdown in ucsp or tdfn ______________________________________________________________________________________ 11 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) ucsp 4x2.eps a 1 1 21-0156 package outline, 4x2 ucsp downloaded from: http:///
max8559 dual, 300ma, low-noise linear regulatorwith independent shutdown in ucsp or tdfn 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 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e e2 n g 1 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm -drawing not to scale- k e [(n/2)-1] x e ref. pin 1 id 0.35x0.35 detail a b d2 a2 a1 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. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 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 1.500.10 mo229 / weec 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 -drawing not to scale- g 2 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm downbonds allowed nono no no yes no yes no package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///

▲Up To Search▲

Price & Availability of MAX8559ETAGGT

	To Download MAX8559ETAGGT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .