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general description the max1589a low-dropout linear regulator operatesfrom a +1.62v to +3.6v supply and delivers a guaran- teed 500ma continuous load current with a low 175mv dropout. the high-accuracy (0.5%) output voltage is preset to internally trimmed voltages from +0.75v to +3.0v. an active-low, open-drain reset output rem ains asserted for at least 70ms after the output voltage reach- es regulation. this device is offered in 6-pin thin sot23 and 6-pin, 3mm x 3mm thin dfn packages. an internal pmos pass transistor maintains low supply current, independent of load and dropout voltage, making the max1589a ideal for portable battery-powered equip- ment such as personal digital assistants (pdas), digital still cameras, cell phones, cordless phones, and note- book computers. other features include logic-controlled shutdown, short-circuit protection, and thermal-overload protection. applications notebook computerscellular and pcs phones personal digital assistants (pdas) handheld computers digital still cameras pcmcia cards cd and mp3 players features ? low 1.62v minimum input voltage ? guaranteed 500ma output current ? 0.5% initial accuracy ? low 175mv dropout at 500ma load ? 70ms reset output flag ? supply current independent of load and dropoutvoltage ? logic-controlled shutdown ? thermal-overload and short-circuit protection ? preset output voltages (0.75v, 1.0v, 1.3v, 1.5v,1.8v, 2.5v, and 3.0v) ? tiny 6-pin thin sot23 package (<1.1mm high) ? thin 6-pin tdfn package (<0.8mm high) max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn ________________________________________________________________ maxim integrated products 1 gnd out in top view max1589a shdn gnd thin sot23 i.c.reset reset 12 3 65 4 4 5 6 shdn in 3 2 1 i.c. out tdfn 3mm x 3mm max1589a pin configurations on off input 1.62v to 3.6v in shdn gnd reset out output 0.75v to 3.0v 500ma to c logicsupply 100k max1589a c in 1 f c out 4.7 f typical operating circuit 19-3664; rev 0; 4/05 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. * insert the desired three-digit suffix (see the selector guide) into the blanks to complete the part number. contact the factory forother output voltages. + denotes lead-free packaging. selector guide max1589a top mark v out (v) suffix sot tdfn 0.75 075 aacc alg 1.00 100 aacd alh 1.30 130 aace ali 1.50 150 aacf alj 1.80 180 aacg alk 2.50 250 aach alf 3.00 300 aaci all ordering information part* temp range pin-package max1589aezt_ _ _+t -40? to +85? 6 thin sot23-6 max1589aett_ _ _ + -40? to +85? 6 tdfn downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and 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. in, shdn , reset to gnd .....................................-0.3v to +4.0v out to gnd ................................................-0.3v to (v in + 0.3v) output short-circuit duration.....................................continuous continuous power dissipation (t a = +70?) 6-pin thin sot23 (derate 9.1mw/? above +70?) ....727mw 6-pin tdfn (derate 24.4mw/? above +70?) .........1951mw operating temperature range ...........................-40? to +85? junction temperature ..................................................... +150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v in = (v out + 0.5v) or 1.8v, whichever is greater; shdn = in, c in = 1?, 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 input voltage v in 1.62 3.60 v input undervoltage lockout v uvlo v in rising (180mv typical hysteresis) 1.30 1.60 v i out = 150ma, t a = +25 c -0.5 +0.5 output voltage accuracy i out = 1ma to 500ma, v in = (v out + 0.5v) to +3.6v -1.5 +1.5 % maximum output current i out continuous 500 ma rms current limit i lim v out = 96% of nominal value 550 850 1150 ma no load 70 140 i out = 500ma 90 ground current i q dropout (note 2) 70 ? dropout voltage v in - v out i out = 500ma, v out 1.8v (note 2) 175 350 mv load regulation ? v ldr i out = 1ma to 500ma 0.02 0.5 % line regulation ? v lnr v in = (v out + 0.5v) to +3.6v, i out = 100ma -0.15 +0.01 +0.15 % / v output noise 10hz to 100khz, i out = 10ma 86 ? rms psrr f < 1khz, i out = 10ma 70 db shutdown t a = +25 c 0.001 1 shutdown supply current i off shdn = gnd t a = +85 c 0.01 ? v ih v in = 1.62v to 3.6v 1.4 shdn input logic levels v il v in = 1.62v to 3.6v 0.6 v t a = +25 c1 300 shdn input bias current i shdn v shdn = 0v or 3.6v t a = +85 c5 na turn-on delay from shdn high to out high, v out = 1.5v 90 ? reset output reset threshold accuracy v out falling (1.7% typical hysteresis) 80 82.5 85 %v out i reset = 100? 1.5 100 reset output low voltage v ol v in = +1.0v, i reset = 100? 3 100 mv downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn _______________________________________________________________________________________ 3 note 1: limits are 100% production tested at t a = +25 c. 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 4% lower than the value of v out when v in = v out + 0.5v. electrical characteristics (continued)(v in = (v out + 0.5v) or 1.8v, whichever is greater; shdn = in, c in = 1?, c out = 4.7?, t a = -40 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units t a = +25 c 0.001 1 reset output high leakage current i oh v reset = 3.6v, reset not asserted t a = +85 c 0.01 ? reset delay t rp from v out high to reset rising 70 100 160 ms thermal protection thermal-shutdown temperature t shdn +165 ? thermal-shutdown hysteresis ? t shdn 15 ? output voltage accuracy vs. load current max1589a toc01 load current (ma) output voltage accuracy (%) 400 300 200 100 -0.1 0 0.1 0.2 -0.2 0 500 v out = +3.0v v out = +1.5v v out = +0.75v output voltage accuracy vs. input voltage max1589a toc02 input voltage (v) output voltage accuracy (%) 3.4 3.0 2.6 2.2 1.8 -0.25 0 0.25 0.50 -0.50 1.4 v out = +1.5v i out = 0ma i out = 100ma i out = 500ma output voltage accuracy vs. temperature max1589a toc03 temperature ( c) output voltage accuracy (%) 60 35 10 -15 -1.0 -0.5 0 0.5 1.0 1.5 -1.5 -40 85 v out = +1.5v i out = 0ma, 100ma, 500ma 120 60 0.01 0.1 1 10 100 1000 ground-pin current vs. load current max1589a toc04 load current (ma) ground-pin current ( a) 100 110 70 80 90 v out = +3.0v v out = +1.5v v out = +0.75v ground-pin current vs. input voltage max1589a toc05 input voltage (v) ground-pin current ( a) 3.2 2.8 2.4 2.0 1.6 20 40 60 80 100 120 0 1.2 3.6 i out = 0ma i out = 500ma i out = 100ma v out = +1.5v ground-pin current vs. temperature max1589a toc06 temperature ( c) ground-pin current ( a) 60 35 10 -15 60 70 80 90 100 50 -40 85 v out = +1.5v i out = 1ma to 500ma i out = 0ma typical operating characteristics (v in = (v out + 0.5v) or 1.8v, whichever is greater; shdn = in, c in = 1?, c out = 4.7?, t a = +25 c, unless otherwise noted.) downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn 4 _______________________________________________________________________________________ dropout voltage vs. load current max1589a toc07 load current (ma) v dropout (mv) 400 300 200 100 40 80 120 160 200 0 0 500 v out = +1.8v v out = +3.0v typical operating characteristics (continued) (v in = (v out + 0.5v) or 1.8v, whichever is greater; shdn = in, c in = 1?, c out = 4.7?, t a = +25 c, unless otherwise noted.) power-supply rejection ratio vs. frequency frequency (khz) psrr (db) 100 10 1 10 20 30 40 50 60 70 80 0 0.1 1000 i out = 10ma v out = +3.0v v out = +1.5v v out = +0.75v max1589a toc08 line-transient response max1589a toc09 40 s/div 3.5v 4v 1.5v10mv/div ac-coupled 500mv/div v out v in i load = 100ma v out = 1.5v line-transient response near dropout max1589a toc10 40 s/div 1.8v 2.5v 1.5v10mv/div ac-coupled 500mv/div v out v in i load = 100ma v out = 1.5v load-transient response max1589a toc12 20 s/div 100ma 500ma 50mv/divac-coupled 500ma/div v out i out v in = 3.6v v out = 1.5v load-transient response max1589a toc11 20 s/div 20ma 200ma 20mv/divac-coupled 200ma/div v out i out v in = 1.8v v out = 1.5v 0 downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn _______________________________________________________________________________________ 5 shutdown response max1589a toc13 100 s/div 00 500mv/div 1v/div v out v shdn r l = 25 v out = 1.5v typical operating characteristics (continued) (v in = (v out + 0.5v) or 1.8v, whichever is greater; shdn = in, c in = 1?, c out = 4.7?, t a = +25 c, unless otherwise noted.) shutdown/reset response max1589a toc14 40ms/div 00 0 1v/div1v/div 1v/div v reset v out v shdn r l = 25 v out = 1.5v line/reset response max1589a toc15 200ms/div 00 0 2v/div1v/div 1v/div v reset v out v in r l = 25 v out = 1.5v downloaded from: http:///
max1589a detailed description the max1589a is a low-dropout, low-quiescent-current,high-accuracy linear regulator designed primarily for battery-powered applications. the device supplies loads up to 500ma and is available with preset output voltages from +0.75v to +3.0v. as illustrated in figure 1, the max1589a contains a reference, an error amplifier, a p-channel pass transistor, an internal feedback volt- age-divider, and a power-good comparator. the error amplifier compares the 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 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. internal p-channel pass transistor the max1589a features a 0.33 (r ds(on) ) p-channel mosfet pass transistor. unlike similar designs usingpnp pass transistors, p-channel mosfets require no base drive, which reduces quiescent current. pnp- based regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. the max1589a does not suffer from these problems andconsumes only 90? (typ) of quiescent current under heavy loads, as well as in dropout. shutdown pull shdn low to enter shutdown. during shutdown, the output is disconnected from the input, an internal 1.5k resistor pulls out to gnd, reset is actively pulled low, and supply current drops below 1?. r r e e s s e e t t output the max1589a s microprocessor (?) supervisory cir- cuitry asserts a guaranteed logic-low reset duringpower-up, power-down, and brownout conditions down to +1v. reset asserts when v out is below the reset threshold and remains asserted for at least 70ms (t rp ) after v out rises above the reset threshold. current limit the max1589a monitors and controls the pass transis-tor s gate voltage, limiting the output current to 850ma (typ). if the output current exceeds i lim , the max1589a output voltage drops. thermal-overload protection thermal-overload protection limits total power dissipa-tion in the max1589a. when the junction temperature exceeds +165 c, a thermal sensor turns off the pass low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn 6 _______________________________________________________________________________________ pin sot23 tdfn name function 16i n regulator input. supply voltage can range from +1.62v to +3.6v. bypass in with at least a1? ceramic capacitor to gnd (see the capacitor selection and regulator stability section). 2 gnd ground. gnd also functions as a heatsink. solder gnd to a large pad or circuit-board ground plane to maximize sot23 power dissipation. 4 gnd ground 35 shdn active-low shutdown input. a logic-low reduces supply current to below 1?. connect toin or logic-high for normal operation. 43 reset active-low, open-drain reset output. reset rises 100ms after the output has achieved regulation. reset falls immediately if v out drops below 82.5% of its nominal voltage, or if the max1589a is shut down. 5 2 i.c. internally connected. leave floating or connect to gnd. 6 1 out regulator output. sources up to 500ma. bypass with a 4.7? low-esr ceramic capacitorto gnd. exposed pad ep ground. ep also functions as a heatsink. solder ep to a large pad or circuit-board ground plane to maximize tdfn power dissipation. pin description downloaded from: http:///
transistor, allowing the ic to cool. the thermal sensor turns the pass transistor on again after the junction tem- perature cools by 15 c, resulting in a pulsed output during continuous thermal-overload conditions. thermal-overload protection safeguards the max1589a in the event of fault conditions. for continuous operation, do not exceed the absolute maximum junction-temperature rating of +150 c. operating region and power dissipation the max1589a s maximum power dissipation depends on the thermal resistance of the ic package and circuitboard, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipated in the device is p = i out ? (v in - v out ). the maximum allowed power dissipation is: p max = (t j(max) - t a ) / ( jc + ca ) where t j(max) - t a is the temperature difference between the max1589a die junction and the surrounding air, jc is the thermal resistance of 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 sur- rounding air. typical thermal resistance ( jc + ja ) for a device mounted to a 1in square, 1oz copper pad is 41 c/w for the 3mm x 3mm tdfn package, and 110 c/w for the 6-pin thin sot23 package. for best heatsinking, expand the copper connected to gnd, orthe exposed paddle. the max1589a delivers up to 500ma and operates with an input voltage up to +3.6v. however, when using the 6-pin sot23 version, high output currents can only be sustained when the input-output differential voltage is low, as shown in figure 2. the maximum allowed power dissipation for the 6-pin tdfn is 1.951w at t a = +70 c. figure 3 shows that the maximum input-output differential voltage is not limitedby the tdfn package power rating. applications information capacitor selection and regulator stability capacitors are required at the max1589a s input and output for stable operation over the full temperaturerange and with load currents up to 500ma. connect a 1? ceramic capacitor between in and gnd and a 4.7? low-esr ceramic capacitor between out and gnd. the input capacitor (c in ) lowers the source impedance of the input supply. use larger output max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn _______________________________________________________________________________________ 7 figure 1. functional diagram p out reset max1589a mos driver with i limit error amp power-good comparator thermal sensor 100ms timer 82.5% ref ref shutdown logic in shdn gnd downloaded from: http:///
max1589a capacitors to reduce noise and improve load-transientresponse, stability, and power-supply rejection. the output capacitor s equivalent series resistance (esr) affects stability and output noise. use outputcapacitors with an esr of 30m or less to ensure sta- bility and optimize transient response. surface-mount ceramic capacitors have very low esr and are com- monly available in values up to 10?. connect c in and c out as close to the max1589a as possible to mini- mize the impact of pc board trace inductance. noise, psrr, and transient response the max1589a is designed to operate with low dropoutvoltages and low quiescent currents in battery-powered systems, while still maintaining good noise, transient response, and ac rejection. see the typical operating characteristics for a plot of power-supply rejection ratio (psrr) vs. frequency. when operating from noisysources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. the max1589a load-transient response (see the typical operating characteristics ) shows two compo- nents of the output response: a near-zero dc shift fromthe output impedance due to the load-current change, and the transient response. a typical transient response for a step change in the load current from 100ma to 500ma is 35mv. increasing the output capacitor s value and decreasing the esr attenuates the overshoot. input-output (dropout) voltage a regulator s minimum input-output voltage difference (dropout voltage) determines the lowest usable supplyvoltage. in battery-powered systems, this determines the useful end-of-life battery voltage. because the max1589a uses a p-channel mosfet pass transistor, its dropout voltage is a function of drain-to-source on-resis- tance (r ds(on) = 0.33 ) multiplied by the load current (see the typical operating characteristics ): v dropout = v in - v out = 0.33 ? i out the max1589a ground current reduces to 70? in dropout. chip information transistor count: 2556process: bicmos low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn 8 _______________________________________________________________________________________ figure 2. power operating regions for 6-pin sot23: maximumoutput current vs. input voltage maximum output current vs. input voltage (power dissipation limit) (v in - v out ) (v) maximum output current (ma) 2.5 2.0 1.5 1.0 0.5 03 . 0 maximum recommendedoutput current 6-pin sot23 t a = +85 c t a = +70 c max1589a fig02 100 200 300 400 500 600 0 maximum output current vs. input voltage (power dissipation limit) (v in - v out ) (v) maximum output current (ma) 2.5 2.0 1.5 1.0 0.5 03 . 0 maximum recommendedoutput current 6-pin tdfn t a = +85 c max1589a fig03 100 200 300 400 500 600 0 figure 3. power operating region for 6-pin tdfn: maximumoutput current vs. input voltage downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn _______________________________________________________________________________________ 9 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 .) downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn 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 .) downloaded from: http:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and tdfn ______________________________________________________________________________________ 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 .) 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:///
max1589a low-input-voltage, 500ma ldo regulator with r r e e s s e e t t in sot and 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. 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. 2.30 ? 0.10 1.50 ? 0.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.40 ? 0.05 1.95 ref 0.30 ? 0.05 0.65 bsc 2.30 ? 0.10 8 t833-1 2.00 ref 0.25 ? 0.05 0.50 bsc 2.30 ? 0.10 10 t1033-1 2.40 ref 0.20 ? 0.05 - - - - 0.40 bsc 1.70 ? 0.10 2.30 ? 0.10 14 t1433-1 1.50 ? 0.10 1.50 ? 0.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.20 ? 0.05 2.40 ref t1433-2 14 2.30 ? 0.10 1.70 ? 0.10 t633-2 6 1.50 ? 0.10 2.30 ? 0.10 0.95 bsc mo229 / weea 0.40 ? 0.05 1.90 ref t833-2 8 1.50 ? 0.10 2.30 ? 0.10 0.65 bsc mo229 / weec 0.30 ? 0.05 1.95 ref t833-3 8 1.50 ? 0.10 2.30 ? 0.10 0.65 bsc mo229 / weec 0.30 ? 0.05 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:///

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