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general description the max6329/max6349 are low-dropout, micropowerlinear voltage regulators with integrated microproces- sor reset circuits. each is available with preset +3.3v, +2.5v, +1.8v, or adjustable output voltages and can deliver up to 150ma load current. employing internal p- channel mosfet pass transistors, the devices con- sume only 25? supply current, independent of the device load. the low supply current, low dropout volt- age, and integrated reset functionality make these devices ideal for battery powered portable equipment. the max6329/max6349 include an internal reset circuit that indicates when the regulator output drops below standard microprocessor supply tolerances (-5% or -10%). the reset output remains asserted for 100ms (min) after the regulator output exceeds the selected reset threshold, ensuring that supply voltages and clock oscillators have stabilized before processor activity is enabled. reset outputs are available in push-pull (active- low or -high) and open-drain (active-low) options. the internal reset circuit replaces external microprocessor supervisors or rc-based reset time delays. the max6329/max6349 are optimized for use with a 1? (min) output capacitor. the regulator output volt- age is adjustable with an external resistor-divider net- work at set (reset threshold voltages track the desired output voltage). each device includes thermal shut- down protection, output short-circuit protection, and reverse leakage protection. the max6329 includes a shutdown feature to reduce regulator current below 1? (max) and the max6349 offers a manual reset input to assert a microprocessor reset while the regula- tor output is within specification. ________________________applications hand-held instrumentselectronic planners palm top computers pcmcia cards usb devices cellular telephones cordless telephones modems features ? preset +3.3v/+2.5v/+1.8v or adjustable regulatoroutput ? 3.0% regulator accuracy over the specifedoperating range ? 25a supply current ? low 180mv dropout at 100ma load ? small output capacitor (1f min ceramic ortantalum) ? zero reverse leakage current ? thermal and short-circuit protection ? integrated microprocessor reset circuit with100ms (min) timeout ? open-drain and push-pull reset outputs ? regulator shutdown input (max6329) or manualreset input (max6349) ? 6-pin sot23 package max6329/max6349 150ma, sot23, low-dropout linear regulators with internal microprocessor reset circuit ________________________________________________________________ maxim integrated products 1 gnd reset/reset 16 out 5 set in max6329/ max6349 sot23-6 top view 234 (mr) shdn ( ) are for max6349 only. pin configuration 19-1889; rev 3; 3/04 ordering information part temp range pin-package max6329 _ _ ut-t 0? to +85? 6 sot23-6 max6349 _ _ ut-t 0? to +85? 6 sot23-6 these parts offer a choice of regulator/reset voltages and resetoutputs. from the selector guide, insert the desired suffix let- ters into the blanks to complete the part number. each device is available in nine standard versions. sample stock is general- ly held on standard versions only (see standard versions table). standard versions have an order increment requirement of 2500 pieces. nonstandard versions have an order increment requirement of 10,000 pieces. contact factory for availability of nonstandard versions. typical operating circuit appears at end of data sheet. selector guide appears at end of data sheet. 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. downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v in = +3.6v, t a = 0? to +85?. typical values are at i out = 0, c out = 2.2?, t a = +25c, unless otherwise noted.) (note 1) 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 shdn to gnd...........................................................-0.3v to +7v set to gnd ..............................................-0.3v to (v out + 0.3v) mr to gnd ...............................................................-0.3v to +7v reset, reset to gnd, (push-pull) ..........0.3v to (v out + 0.3v) reset to gnd,(open-drain).....................-0.3v to (v out +0.3v) out to gnd .............................................................-0.3v to +7v short-circuit duration.................................................continuous maximum current into any pin (except in, out) ............?0ma continuous power dissipation (t a = +70?) 6-pin sot23 (derate 7.1mw/? above +70?).............571mw thermal resistance ( ja ) ............................................+140?/w operating temperature range...............................0? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units input voltage range v in 2.5 5.5 v supply current i q at gnd 25 50 ? shutdown supply current t a = +25 o c1 a regulator maximum output current 150 ma v in = 4.0v to 5.5v, set = gnd, i out = 0 to 100ma, t/s versions 3.20 3.3 3.40 v in = 3.0v to 5.5v, set = gnd, i out = 0 to 100ma, z/y versions 2.425 2.5 2.575 output voltage (note 2) v out v in = 2.5v to 5.5v, set = gnd, i out = 0 to 100ma, w/v versions 1.745 1.8 1.855 v i load = 10ma, t/s versions 20 30 i load = 150ma, t/s versions 300 360 i load = 10ma, z/y versions 25 35 i load = 150ma, z/y versions 300 400 i load = 10ma, w/v versions 60 200 dropout voltage (note 3) ? v do i load = 150ma, w/v versions 600 750 mv output current limit v in = v out +1v 350 ma input reverse leakage current v in = 0, v out = 5.5v 0.01 1.5 ? startup-time response rising edge of v in or shdn to v out r l = 68 , set = gnd, c l = 1? 500 ? v il 0.3 ? v in shdn input voltage v ih max6329 only 0.8 ? v in v shdn input current i shdn shdn = gnd or in max6329 only -1 0.1 1 a set reference voltage v set 1.20 1.23 1.26 v set input leakage current i set -10 +10 na thermal shutdown temperature 160 o c thermal shutdown hysteresis 20 o c downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit _______________________________________________________________________________________ 3 note 1: limits over temperature are guaranteed by design and not production tested. note 2: specification from 0 c to less than 25 c is guaranteed to four sigma only. note 3: dropout voltage is defined as v in - v out when v out is 2% below the value of v out for v in = v out + 1v. note 4: v adj = v set (1 + r1/r2), where v set = 1.23v nominal. parameter symbol conditions min typ max units reset circuit max63_9t set = gnd 2.92 3.185 max63_9s set = gnd 2.75 3.02 max63_9z set = gnd 2.21 2.41 max63_9y set = gnd 2.08 2.28 max63_9w set = gnd 1.59 1.74 max63_9v set = gnd 1.50 1.65 m ax63_9t/z /w se t = d i vi d er, fig ur e 1 (n ote 4) 0.885 ? v ad j 0.965 ? v ad j reset threshold (note 2) v th m ax63_9s /y /v se t = d i vi d er, fig ur e 1 (n ote 4) 0.835 ? v ad j 0.915 ? v ad j v reset timeout period t rp 100 200 300 ms v out to reset delay t rd 35 ? v il 0.2 ? v out mr input voltage v ih max6349 only 0.8 ? v out v mr minimum input pulse max6349 only 1 ? mr glitch rejection max6349 only 120 ns mr to reset delay max6349 only 500 ns mr pullup resistance max6349 only 10 20 50 k v out > 1.0v, i sink = 50? 0.3 open-drain reset output voltage v ol v out > 2.7v, i sink = 3.2ma 0.4 v open-drain reset outputleakage current i lkg 1.0 ? v out 1.0v, i sink = 50? 0.3 v ol v out < v th (min), i sink = 3.2ma 0.4 push-pull reset output voltage v oh v out > v th (max), i source = 500? 0.8 ? v out v v ol v out > v th (max), i sink = 3.2ma 0.4 push-pull reset output voltage v oh v out < v th , i source = 150? 0.8 ? v out v electrical characteristics (continued)(v in = +3.6v, t a = -0 c to +85 c. typical values are at i out = 0, c out = 2.2?, t a = +25 c, unless otherwise noted.) (note 1) downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit 4 _______________________________________________________________________________________ 0 5 10 15 20 25 30 35 40 02 1 3456 ground pin current vs. input voltage max6329/49 toc01 input voltage (v) ground pin current ( a) i out = 150ma i out = 0 0 1 2 3 4 5 6 7 8 9 10 11 2.5 3.0 3.5 4.0 4.5 5.0 5.5 shutdown current vs. input voltage max6329/49 toc02 input voltage (v) shutdown current (na) 250 0 11 01 0 0 maximum pulse duration vs. reset threshold overdrive 50 max6329/49 toc03 reset threshold overdrive (v th - v out ) (mv) pulse duration ( s) 100 150 200 reset asserts abovethis line 0 100 50 200150 250 300 06 0 30 90 120 150 dropout voltage vs. load current max6329/49 toc04 load current (ma) dropout voltage (mv) v out = 3.3v 0.01 0.1 1 10 power-supply rejection ratio vs. frequency max6329/49 toc05 frequency (khz) psrr (db) 0 -60 -50 -40 -30 -20 -10 c out = 1 f 0 1.00.5 2.01.5 3.02.5 3.5 02 3 1 456 output voltage vs. input voltage max6329/49 toc06 input voltage (v) output voltage (v) max63_9s/t 0 7550 25 100 125 150 06 0 45 15 30 75 90 105 120 135 150 region of stable c out esr vs. load current max6329/49 toc07 load current (ma) c out esr ( ) stable region c out = 1 f c out = 4.7 f 10ms/div output noise max6329/49 toc08 v out 10mv/div 50ms/div shutdown response max6329/49 toc09 reset5v/div shdn5v/div out5v/div typical operating characteristics (t a = +25 c, unless otherwise noted.) downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit _______________________________________________________________________________________ 5 20 s/div startup response max6329/49 toc10 v out 2v/div v in 5v/div i out = 50ma c out = 1 f 200 s/div load transient response max6329/49 toc11 v out 50mv/div v in = 5v i out = 0 - 100ma 200 s/div load transient response near dropout max6329/49 toc12 v out 50mv/div v in = 3.6v i out = 0 - 100ma 500 s/div line transient max6329/49 toc13 v in = 3.6v i out = 0 - 100ma 5v v in 4.5v v out 50mv/div i out = 0 - 50ma typical operating characteristics (continued) (t a = +25 c, unless otherwise noted.) downloaded from: http:///
detailed description the max6329/max6349 are low-dropout, low-quies- cent current linear regulators with integrated micro- processor reset circuits. the devices drive loads up to 150ma and are available with preset output voltages of +3.3v, +2.5v, or +1.8v. the internal reset circuit moni- tors the regulator output voltage and asserts the reset output when the regulator output is below the micro- processor supply tolerance. regulator the regulator core operates with an input voltage rangeof +2.5v to +5.5v. the output voltage is offered with three fixed voltage options (+3.3v, +2.5v, and +1.8v) for the max6329 and max6349. enable the fixed voltage output by connecting set to ground. the max6329/max6349 offer an adjustable output voltage that is implemented with an external resistor-divider net- work connected to out, set, and gnd (figure 1). set must be connected to either gnd or the external divider. the max6329/max6349 automatically determine the feedback path depending on the voltage seen at set. featured characteristics include ultra-low quiescent cur- rent and low dropout voltage. the typical operating circuit shows a typical connection for the max6329. out is an internally regulated low dropout (ldo) linearregulator that powers a microprocessor. reset circuit the reset supervisor circuit is fully integrated in the max6329/max6349 and uses the same reference volt- age as the regulator. two supply tolerance reset thresh- olds, -5% and -10%, are provided for each type of device: max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit 6 _______________________________________________________________________________________ pin description pin name description 1 in regulator input. supply voltage can range from +2.5v to +5.5v. 2 gnd ground. this pin also functions as a heatsink. solder to large pads or the circuit board ground plane tomaximize thermal dissipation. shdn (max6329 only) active-low shutdown input. a logic low reduces the supply current to < 1?. connect 3 mr ( max6349 only) active-low manual reset input. a logic low forces a reset. reset remains asserted for the duration of the reset timeout period after mr transitions from low to high. leave unconnected or connect to v out if not used. mr has an internal pullup resistor of 20k (typ) to out. reset active-low reset output. reset remains low while v out is below the reset threshold or while mr is held low. reset remains low for the duration of the reset timeout period after the reset conditions are terminated. 4 reset active-high reset output. reset remains high while v out is below the reset threshold or while mr is held low. reset remains high for the duration of the reset timeout period after the reset conditions areterminated. 5 set feedback input for setting the output voltage. connect to gnd to set the output voltage to the preset fixed value (+3.3v, +2.5v, or +1.8v). connect to an external resistor-divider network for adjustable output operation. 6 out regulator output. fixed (+3.3v, +2.5v, or +1.8v) or adjustable (+1.23v to +5.0v). sources up to150ma. bypass with a 1? minimum capacitor for full rated performance. max6329max6349 2.5v to 5.5v in out set r2 r1 gnd figure 1. adjustable output voltage configuration downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit _______________________________________________________________________________________ 7 5% reset: reset does not assert until the regulator out- put voltage is at least -5% out of tolerance and alwaysasserts before the regulator output voltage is -10% out of tolerance. 10% reset: reset does not assert until the regulator output voltage is at least -10% out of tolerance andalways asserts before the regulator output voltage is -15% out of tolerance. reset output a ? s reset input starts the ? in a known state. the max6329/max6349 ? supervisory circuits assert areset during power-up, power-down, and brownout conditions. reset is guaranteed to be logic high or low depending on the device chosen (see selector guide ). reset or reset asserts when v out is below the reset threshold and for at least 100ms (t rp ) after v out rises above the reset threshold. reset or reset also asserts when mr is low (max6349). shutdown (max6329 only) shdn allows for the regulator to shutdown thereby reducing the total i in consumption of the device. the max6329 provides a digitally controlled active-lowshutdown function. in shutdown mode the pass transis- tor, control circuit, reference, and all biases turn off, reducing the supply current to below 1a. connect shdn to in for normal operation. manual reset input (max6349 only) many ?-based products require manual reset capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. for the max6349, a figure 2. functional diagram reverse leakage protection thermal sensor mos driver with current limit 1.23v 60mv output stage 200ms reset delay resetcomparator gnd mr feedback mode comparator erroramp in shdn outset reset/reset downloaded from: http:///
max6329/max6349 logic low on mr asserts reset while the regulator is still within tolerance.reset remains asserted while mr is low and for the reset timeout period (100ms min) after mr returns high. the mr input has an internal pullup of 20k (typ) to out. this input can be driven with ttl/cmos logiclevels or with open-drain/collector outputs. connect a normally open momentary switch from mr to gnd to create a manual reset function; external debounce cir-cuitry is not required. if mr is driven from long cables or the device is used in a noisy environment, connect a0.1? capacitor from mr to gnd to provide additional noise immunity. reverse leakage protection an internal circuit monitors the input and output volt- ages. when the output voltage is greater than the input voltage, the internal pass transistor and parasitic diodes turn off. out powers the device. there is no leakage path from out to in. therefore, the output can be powered from an auxiliary supply such as a backup battery without any need for additional blocking diodes. current limit the max6329/max6349 include a current limiter thatmonitors and controls the pass transistor s gate voltage, limiting the output current to 350ma (typ). the output canbe shorted to ground for an indefinite period without damaging the part. thermal overload protection when the junction temperature exceeds t j = +160 ?, the thermal sensor signals the shutdown logic, turningoff the pass transistor and allowing the ic to cool. the thermal sensor will turn the pass transistor on again after the ic s junction temperature cools by 20 c, resulting in a pulsed output during continuous thermal-overload conditions. thermal overload protection is designed to protect the max6329/max6349 in the event of fault conditions. for continuous operation, do not exceed the absolute maximum junction temperature rating of t j = +150 ?. operating region and power dissipation the max6329/max6349s maximum power dissipation depends on the thermal resistance of the case and cir- cuit board, the temperature difference between the diejunction and the ambient air, 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 ) / ( jb + ba ) where t j - t a is the temperature difference between the die junction and the surrounding air, jb (or jc ) is the thermal resistance of the package, and ba is the ther- mal resistance through the printed circuit board, coppertraces, and other materials to the surrounding air. the max6329/max6349s ground pin (gnd) performs the dual function of providing an electrical connectionto the system ground and channeling heat away. connect gnd to the system ground using a large pad or ground plane. applications information output voltage selection the max6329/max6349 feature dual mode operation:they operate in either a preset voltage mode or an adjustable mode. in preset voltage mode, internal feedback resistors set the max6329/max6349 to +3.3v, +2.5v, or +1.8v (see selector guide ). select this mode by connecting set to ground. in adjustablemode, select an output between 1.23v to 5.0v using two external resistors connected as a voltage divider to set (figure 1). the output voltage is set by the following equation: v out = v set (1 + r1/r2) where v set = 1.23v. to simplify resistor selection: r1 = r2 (v out /v set - 1) choose r2 100k to optimize power consumption, accuracy, and high-frequency power-supply rejection.since the v set tolerance is typically less than ?0mv, the output can be set using fixed resistors instead ofvariable resistors. in preset voltage mode, impedance between set and ground should be less than 50k . 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit 8 _______________________________________________________________________________________ downloaded from: http:///
capacitor selection and regulator stability for stable operation over the full temperature rangeand with load currents up to 150ma, use a 1? (min) output capacitor. to reduce noise and improve load transient response, stability, and power-supply rejec- tion, use large output capacitor values such as 10?. note that some ceramic dielectrics exhibit large capac- itance and esr variation with temperature. with dielectrics such as z5u and y5v, it may be necessary to use 2.2? or more to ensure stability at temperatures below -10 c. with x7r or x5r dielectrics, 1f should be sufficient at all operating temperatures. a graph ofthe region of stable c out esr vs. load current is shown in the typical operating characteristics . to improve power-supply rejection and transientresponse use a 1? capacitor between in and gnd. input-output (dropout) voltage a regulator s minimum input-output voltage differential (or dropout voltage) determines the lowest useablesupply voltage. in battery powered systems, this will determine the useful end-of-life battery voltage. since the max6329/max6349 use a p-channel mosfet pass transistor, their dropout voltage is a function of r ds(on) multiplied by the load current (see electrical characteristics ). negative going out transients these supervisors are relatively immune to short-dura-tion, negative going out transients. the typical operating characteristics section shows a graph of the maximum transient duration vs. reset thresholdoverdrive for which reset is not asserted. the graph was produced using negative going out transients starting at out and ending below the reset threshold by the magnitude indicated (reset threshold overdrive). the graph shows the maximum pulse width that a negative going out transient can typically have without triggering a reset pulse. as the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. typically, an out transient that goes only 10mv below the reset threshold and lasts for 75? will not trigger a reset pulse. max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit _______________________________________________________________________________________ 9 chip information transistor count: 800process: bicmos max6329 set v cc shdn reset in 2.5v to 5.5v gnd gnd p 1 f reset out typical operating circuit downloaded from: http:///
max6329/max6349 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit 10 ______________________________________________________________________________________ regulator output voltage v out reset tolerance reset output package information shdn mr 3.3v 2.5v 1.8v -5% v th t/z/w -10% v th s/y/v open- drain (p) reset push- pull (l) reset push-pull (h) top mark max6329tp ** * * aaip max6329tl ** * * aaio max6329th ** * * aain max6329sp ** * * aaim max6329sl ** * * aail max6329sh ** * * aaik max6329zp ** ** aajb max6329zl ** * * aaja max6329zh ** * * aaiz max6329yp ** * * aaiy max6329yl ** ** aaix max6329yh ** * * aaiw max6329wp ** * * aaiv max6329wl ** ** aaiu max6329wh ** * * aait max6329vp ** * * aais max6329vl ** * * aair max6329vh ** * * aaiq max6349tp ** * * aajh max6349tl ** * * aajq max6349th ** * * aajf max6349sp ** * * aaje max6349sl ** * * aajd max6349sh ** * * aajc max6349zp ** * * aajt max6349zl ** * * aajs max6349zh ** * * aajr max6349yp ** * * aajg max6349yl ** * * aajp max6349yh ** * * aajo max6349wp ** ** aajn max6349wl ** * * aajm max6349wh ** * * aajl max6349vp ** * * aajk max6349vl ** ** aajj max6349vh ** * * aaji selector guide bold items indicate standard versions. samples are generally available on standard versions only. contact factory for availability of nonstandard versions. downloaded from: http:///
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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. 6lsot.eps f 1 1 21-0058 package outline, sot-23, 6l 150ma, sot23, low dropout linear regulators with internal microprocessor reset circuit max6329/max6349 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:///

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