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general description the max8530/max8531 offer the benefits of low-dropout voltage and ultra-low power regulation in subminiaturized ucsp and qfn packages with an inte- grated microprocessor reset circuit (max8530 only). the devices operate from a 2.5v to 6.5v input and deliver up to 200ma and 150ma outputs with low dropout of 100mv (typ) at 100ma. designed with an internal p-channel mosfet pass transistor, the supply current is kept at a low 130? (with both ldos on), independent of the load current and dropout voltage. other features include short-circuit protection and thermal -shutdown protection. the max8530 provides microprocessor open-drain,active-low reset output to monitor out1, eliminating external components and adjustments. the max8530 asserts a 100ms (min) reset signal when out1 drops below 87% of the nominal output voltage. the max8531 includes a reference bypass pin for low output noise (40? rms ). both devices include a logic-controlled shutdown inputand are available in 6-bump ucsp and 6-pin thin qfn exposed pad packages. applications cellular and cordless phonespdas and palmtop computers notebook computers digital cameras pcmcia cards wireless lan cards hand-held instruments features ? guaranteed 200ma output current for out1 ? guaranteed 150ma output current for out2 ? low 100mv (typ) dropout at 100ma load for both ldos ? open-drain, active-low 100ms (min) reset timer(max8530) ? low 40? rms output noise (max8531) ? low 130? operating supply current ? <1? shutdown current ? thermal-overload and short-circuit protection ? output current limit ? tiny packages available 1.16 x 1.57 x 0.6mm ucsp (3 x 2 grid)3mm x 3mm thin qfn max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn ordering information 19-2711; rev 1; 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. * xy = output voltage code (see the output voltage selector guide). ** ep = exposed pad. + denotes lead-free package. evaluation kit available pin configurations appear at end of data sheet.output voltage selector guide appears at end of data sheet. part temp range out_ voltage pin-package max8530 e btxy*- t - 40 c to + 85 c 1.5v to 3.3v 6 ucs p m ax 8530e btxy*+ t - 40 c to + 85 c 1.5v to 3.3v 6 ucs p m ax 8530e ttxy*- t - 40 c to + 85 c 1.5v to 3.3v 6 thi n qfn- ep** m ax 8530e ttxy*+ t - 40 c to + 85 c 1.5v to 3.3v 6 thi n qfn- ep** max8531 e btxy*- t - 40 c to + 85 c 1.5v to 3.3v 6 ucs p m ax 8531e btxy*+ t - 40 c to + 85 c 1.5v to 3.3v 6 ucs p m ax 8531e ttxy*- t - 40 c to + 85 c 1.5v to 3.3v 6 thi n qfn- ep m ax 8531e ttxy*+ t - 40 c to + 85 c 1.5v to 3.3v 6 thi n qfn- ep in out1 2.2 f c in 2.2 f input 2.5v to 6.5v 1.5v to 3.3v at 200ma 1.5v to 3.3v at 150ma 1 f shdn off on out2 gnd reset baseband p v i/o v core reset max8530 typical operating circuit downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(in = 3.8v, shdn = in, c bp = 10nf (max8531), t a = -40? to +85? , unless otherwise noted. typical values are at t a = +25?.) (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, shdn , reset , bp to gnd .................................-0.3v to +7v out1, out2 to gnd...................................-0.3v to (v in + 0.3v) output short-circuit duration ........................................indefinite continuous power dissipation (t a = +70 c) 6-bump ucsp (derate 3.9mw/ c above +70 c) ........308mw 6-lead qfn (derate 24.4mw/ c above +70 c) ........1951mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c 6-bump+ ucsp solder profile ....................................(note 1) 6-lead qfn lead temperature (10s) .........................+300 c parameter symbol conditions min typ max units input voltage v in 2.5 6.5 v undervoltage lockout threshold v uvlo in rising, hysteresis is 40mv (typ) 2.15 2.25 2.42 v t a = +25?, i out1 = i out2 = 1ma -1 +1 t a = -40? to +85?, i out1 = i out2 = 1ma -2 +2 output voltage accuracy t a = - 40c to + 85 c , i ou t 1 = 0.1m a to 200m a, i ou t 2 = 0.1m a to 150m a -3 +3 % out1 200 maximum output current i out_ out2 150 ma out1 210 330 550 current limit i lim out2 165 280 500 ma no load 130 220 ground current i q i out1 = i out2 = 100ma 150 ? dropout voltage v out_ - v in i out_ = 100ma (note 3) 100 200 mv line regulation ? v lnr in = (out_ + 0.1v) to 3.8v -0.2 +0.2 %/v max8530 320 output voltage noise 10hz to 100khz, c out = 10?, i out = 10ma max8531 40 ? rms max8530 60 ripple rejection psrr 100hz, i out = 30ma max8531 62 db shutdown shdn = 0, t a = +25? 0.01 1 shdn supply current i off shdn = 0, t a = +85? 0.1 ? v ih input high voltage 1.6 shdn input threshold v il input low voltage 0.4 v t a = +25? 0.7 100 shdn input bias current i shdn shdn = in or gnd t a = +85? 0.8 na thermal protection thermal-shutdown temperature t shdn t j rising 160 ? thermal-shutdown hysteresis ? t shdn 10 ? note 1: for ucsp solder profile information, visit www.maxim-ic.com/1st_pages/ucsp.html. downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn _______________________________________________________________________________________ 3 electrical characteristics (continued)(in = 3.8v, shdn = in, c bp = 10nf (max8531), t a = -40? to +85? , unless otherwise noted. typical values are at t a = +25?.) (note 2) note 2: all units are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design. note 3: 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 + 0.5v. specification applies only when v out 2.5v. parameter symbol conditions min typ max units reset output (max8530 only) reset threshold v th percentage of nominal output, out1 falling,when reset falls. 84 87 89 % reset threshold hysteresis 0.5 % i reset = 500?, in = 3.8v 10 20 reset output voltage low (open-drain, active low) v ol i reset = 100?, in = 1.2v 10 40 mv t a = +25? 0.001 1 reset open-drain output leakage current v reset = 6.5v t a = +85? 0.01 ? reset active timeout delay from out1 rising to reset rising. 100 200 360 ms typical operating characteristics v out1 = 3.3v, v out2 = 1.5v, load = 80ma (both output voltages), v in = 3.8v, c out_ = 2.2?, c bp = 0.01?, c in = 2.2f, and t a = +25?, unless otherwise noted. supply current vs. supply voltage max8530 toc01 supply voltage (v) supply current ( a) 6 5 4 3 2 1 50 100 150 200 250 0 0 80ma load, both outputs no load supply current vs. load current max8530 toc02 load current (ma) supply current ( a) 70 60 40 50 20 30 10 20 40 60 80 100 120 140 160 180 200 0 08 0 both outputs loaded supply current vs. temperature max8530 toc03 temperature ( c) supply current ( a) 60 35 10 -15 20 40 60 80 100 120 140 160 180 200 0 -40 85 80ma load, both outputs downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 4 _______________________________________________________________________________________ typical operating characteristics (continued) v out1 = 3.3v, v out2 = 1.5v, load = 80ma (both output voltages), v in = 3.8v, c out_ = 2.2?, c bp = 0.01?, c in = 2.2f, and t a = +25?, unless otherwise noted. dropout voltage vs. load current max8530 toc04 load current (ma) dropout voltage (mv) 180 160 140 120 100 80 60 40 20 50 100 150 200 250 0 0 200 ldo dropout voltage vs. v out max8530 toc05 v out (v) dropout voltage (mv) 3.2 3.1 3.0 2.9 2.8 2.7 2.6 20 40 60 80 100 120 0 2.5 3.3 i out1 = 80ma output voltage accuracy vs. temperature max8530 toc06 temperature ( c) output voltage (%) 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 psrr vs. frequency max8530 toc07 frequency (khz) psrr (db) 100 10 1 0.1 10 20 30 40 50 60 70 0 0.01 1000 out2 = 2.85v out1 = 2.85v 100 load channel-to-channel isolation vs. frequency (max8531) max8530 toc08 frequency (khz) channel-to-channel isolation (db) 100 10 0.1 1 10 20 30 40 50 60 70 80 0 0.01 1000 100 load output noise spectral density vs. frequency (max8531) max8530 toc09 frequency (khz) noise density (nv rms / hz) 10 1 0.1 100 1000 10,000 10 0.01 100 output noise (10hz to 100khz) (max8531) max8530 toc10 v out_ 500 v/ div 10ms/div line transient max8530 toc11 v out_ 4.5v 40 s/div v in 3.5v1v/div 20mv/div ac-coupled downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn _______________________________________________________________________________________ 5 load transient (v in = 3.8v, i load = 1ma to 80ma) max8530 toc12 i load 50ma/div 10 s/div v out 0 20mv/divac-coupled pin description pin max8530 (qfn) max8531 (qfn) max8530 (ucsp) max8531 (ucsp) name function 1 1 b3 b3 out2 regulator 2 output. guaranteed 150ma output current. 2 2 b2 b2 in regulator input 3 3 b1 b1 out1 regulator 1 output. guaranteed 200ma output current. 4 4 a1 a1 gnd ground. also functions as a heatsink for the 6-pin qfn. solder to a largepad or the circuit board ground plane to maximize thermal dissipation. 5 5 a2 a2 shdn shutdown input. a logic low shuts down both regulators. connect to infor normal operation. 6 a3 reset reset active-low open-drain output. minimum timeout of 100ms. reset is low in shutdown. ?a 3b p reference noise bypass. connect to a 0.01? ceramic capacitor forreduced noise at both outputs. typical operating characteristics (continued) v out1 = 3.3v, v out2 = 1.5v, load = 80ma (both output voltages), v in = 3.8v, c out_ = 2.2?, c bp = 0.01?, c in = 2.2f, and t a = +25?, unless otherwise noted. load transient near dropout max8530 toc13 i load 50ma/div 10 s/div v out 0 20mv/divac-coupled v in = v out + 0.1v reset response (max8530) max8530 toc14 v out- 2v/div 40ms/div v in 0 v reset 2v/div 0 2v/ div 0 shutdown response max8530 toc15 v out- 1v/div 1ms/div 0 v shdn 2v/div 0 downloaded from: http:///
max8530/max8531 detailed description the max8530/max8531 are low-power, low-dropout,low-quiescent current linear regulators with reset designed primarily for battery-powered applications. for preset output voltages, refer to the output voltage selector guide . other combinations between 1.5v and 3.3v are available in 50mv increments. this devicesupplies loads up to 200ma for out1 and 150ma for out2. the max8530/max8531 consist of a 1.25v ref- erence, error amplifiers, p-channel pass transistors, reset block, and internal feedback voltage-dividers. the 1.25v bandgap reference is connected to the error amplifier? 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 pulledlower, allowing more current to pass to the output and increasing 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 the out_ pin. reset the reset circuit is active at power-up and power-down.reset is held low at power-up. the reset timing starts once the out1 voltage reaches 87% (typ) of its regula- tion voltage. the reset signal goes high 200ms (typ) after the out1 voltage reaches 87% (typ) of its regulationvoltage. at power-off, reset goes low when the out1 voltage is below 87% (typ) of its regulation voltage. dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 6 _______________________________________________________________________________________ p n error amp in shdn gnd out1 reset* * max8530 only**max8531 only bp**out2 mos driver with i limit delay thermal sensor ldo2 87% ref 1.25v ref shutdown and power-on control max8530max8531 functional diagram downloaded from: http:///
shutdown the max8530/max8531 have a single shutdown con-trol input ( shdn ). drive shdn low to shut down both outputs, reducing supply current to 10na. connectshdn to a logic high, or in, for normal operation. internal p-channel pass transistor the max8530/max8531 feature two 1 p-channel mosfet pass transistors. a p-channel mosfet pro- vides several advantages over similar designs using pnp pass transistors, including longer battery life. it requires no base drive, substantially reducing quies- cent current. pnp-based regulators waste considerable current in dropout when the pass transistor saturates and also use high base-drive currents under heavy loads. the max8530/max8531 do not suffer these problems and consume only 150? of quiescent cur- rent whether in dropout, light-load, or heavy-load appli- cations (see the typical operating characteristics ). whereas a pnp-based regulator has dropout voltagethat 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 voltage at lighter loads. current limit the max8530/max8531 contain two independent cur-rent limiters, one for each regulator, which monitor and control the pass transistor? gate voltage and limit the output currents to 210ma and 165ma minimum. the output can be shorted to ground for an indefinite time without damaging the part. thermal-overload protection thermal-overload protection limits total power dissipa- tion in the max8530/max8531. when the junction tem- perature exceeds t j = +160?, the thermal sensor signals the shutdown logic, turning off the pass transistorand allowing the ic to cool. the thermal sensor turns the pass transistor on again after the ic? junction tempera- ture cools by 10?, resulting in a pulsed output during continuous thermal-overload conditions. thermal-overload protection is designed to protect the max8530/max8531 in the event of fault conditions. for continual operation, do not exceed the absolute maxi- mum junction temperature rating of t j = +150?. operating region and power dissipation the max8530/max8531s?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 across the device is p = i out (v in - v out ). maximum power dissipation: p max = (t j - t a )/( jb + ba ) where t j - t a is the temperature difference between the max8530/max8531 die junction and the surrounding air, jb (or jc ) is the thermal resistance of the package, and ba is the thermal resistance through the printed circuit board, copper traces, and other materials to the sur-rounding air. the gnd pin of the max853_ett__ (6-lead qfn) per- forms the dual functions of providing an electrical con- nection to the ground and channeling heat away. connect the gnd pin and exposed pad to ground using a large pad or ground plane. low-noise operation (max8531) an external 0.01? bypass capacitor at bp, in conjunc-tion with an internal resistor, creates a lowpass filter (see the typical application circuit ). the max8531 exhibits 40? rms output voltage noise with c bp = 0.01? and c out = 2.2? (see the output noise spectral density vs. frequency graph in the typical operating characteristics ). max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn _______________________________________________________________________________________ 7 in out1 2.2 f c in 2.2 f input 2.5v to 6.5v 1.5v to 3.3vat 200ma 1.5v to 3.3vat 150ma 1 f 10nf shdn off on out2 gnd bp max8531 max8531 typical appication circuit downloaded from: http:///
max8530/max8531 applications information capacitor selection and regulator stability use a 2.2? capacitor on the max8530/max8531s inputs. larger input capacitor values with lower esrs provide better supply-noise rejection and line-transient response. to reduce noise and improve load transients, use large-output capacitors, up to 10?. for stable operation over the full temperature range and with rated maximum load currents, use a minimum of 2.2? (or 1? for <150ma loading for out1) and 1? for out2. note that some ceramic dielectrics exhibit large capac- itance and esr variation with temperature. with dielectrics such as z5u and y5v, it is necessary to use 4.7? or more to ensure stability at temperatures below -10?. with x7r or x5r dielectrics, 2.2? is sufficient at all operating temperatures. these regulators are opti- mized for ceramic capacitors. tantalum capacitors are not recommended. psrr and operation from sources other than batteries the max8530/max8531 is designed to deliver lowdropout voltages and low quiescent currents in battery- powered systems. power-supply rejection is 60db at low frequencies (see the power-supply rejection ratio vs. frequency graph in the typical operating char- acteristics ). when operating from sources other than batteries,improve supply-noise rejection and transient response by increasing the values of the input and output bypass capacitors and through passive filtering techniques. load-transient considerations the max8530/max8531 load-transient responsegraphs (see the typical operating characteristics ) show two components of the output response: a dcshift in the output voltage because of the different load currents, and the transient response. increase the outputcapacitor? value and decrease its esr to attenuate transient spikes. input/output (dropout voltage) a regulator? minimum input/output voltage 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 max8530/max8531 use a p-channel mosfet pass transistor, their dropout voltage is a function of 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 max8530/max8531can be limited by the maximum power dissipation of the package. obtain the maximum power dissipation by calculating the power dissipation of the package as a function of the input voltage, output voltage, and output currents. the maximum power dissipation should not exceed the package? maximum power rating: p = (v in(max) - v out1 ) x i out1 + (v in(max) - v out2 ) x i out2 where:v in(max) = maximum input voltage p max = maximum power dissipation of the package (308mw for ucsp and 1951mw for the qfn package)v out1 = output voltage of out1 v out2 = output voltage of out2 i out1 = maximum output current of out1 i out2 = maximum output current of out2 p should be less than p max . if p is greater than p max , consider using the qfn package. dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 8 _______________________________________________________________________________________ downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn _______________________________________________________________________________________ 9 12 in 3 65 4 out1 reset (bp*)shdn gnd out2 thin qfn max8530ett (max8531ett) *max8531 only top view a "+" sign will replace the first pin indicator on lead-free packages. chip information transistor count: 1720process: bicmos output voltage selector guide part v out1 v out2 top mark max8530ebtj2 2.85 1.8 acr max8530ebtjo 2.85 2.6 aca max8530ebtkg 2.8 3.0 act max8530ettp2 2.5 1.8 aet max8530etto2 2.6 1.8 aes max8530ettk2 2.8 1.8 aer max8530ettko 2.8 2.6 aeq max8531ebtjj 2.85 2.85 acg max8531ebtgg 3.0 3.0 aci max8531ettgg 3.0 3.0 aef note : contact the factory for other output voltages between 1.5v and 3.3v. the minimum order quantity is 25,000 units. max8530ebt (max8531ebt) ucsp a2 a3 a1 shdn gnd reset (bp*) in out1 *max8531 only out2 b1 b2 b3 top view a "+" sign will replace the first pin indicator on lead-free packages. pin configurations downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 10 ______________________________________________________________________________________ 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 .) 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 downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn ______________________________________________________________________________________ 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. 2.300.10 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 downloaded from: http:///
max8530/max8531 dual low-dropout linear regulators with reset or low-noise output in ucsp or qfn 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. 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 .) 6l, ucsp.eps g 1 1 21-0097 package outline, 3x2 ucsp downloaded from: http:///

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