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general description the max1832?ax1835 are high-efficiency step-upconverters with complete reverse battery protection that protects the device and the load when the battery is reversed. they feature a built-in synchronous rectifier, which allows for over 90% efficiency and reduces size and cost by eliminating the need for an external schottky diode. these step-up converters operate from a +1.5v to +5.5v input voltage range and deliver up to 150ma of load cur- rent. the max1833eut/max1835eut (sot devices) have a fixed 3.3v output voltage. the max1833ett30 (tdfn device) has a fixed 3.0v output voltage. the max1832/max1834 have adjustable outputs from +2v to +5.5v. in shutdown, the max1832/max1833 connect the battery input to the voltage output, allowing the input bat- tery to be used as a backup or real-time clock supply when the converter is off (see selector guide). max183_eut devices are available in a miniature 6-pin sot23 package. the max1833ett30 is available in a 3mm ? 3mm thin dfn package. the max1832evkit is available to speed designs. ________________________applications medical diagnostic equipmentpagers hand-held instruments remote wireless transmitters digital cameras cordless phones battery backup pc cards local 3.3v or 5v supply features ? reverse battery protection for dc-dc converterand load ? up to 90% efficiency ? no external diode or fets needed ? internal synchronous rectifier ? 4a quiescent current ? <1a shutdown supply current ? +1.5v to +5.5v input voltage range ? accurate shdn threshold for low-battery cutoff ? batt connected to out in shutdown for backuppower (max1832/max1833) ? rst output (max1833/max1835) ? fixed 3.3v/3.0v output voltage ? adjustable output voltage (max1832/max1834) ? up to 150ma output current ? tiny 6-pin sot23 package ? tiny 6-pin thin qfn package (max1833ett30) max1832?ax1835 high-efficiency step-up converters with reverse battery protection ________________________________________________________________ maxim integrated products 1 batt lx gnd 16 fb (rst) 5 out shdn max1832max1834 (max1833eut) (max1835) sot23 top view 234 1 2 3 6 5 4 rstout lx shdn batt gnd max1833ett tdfn 3mm ? 3mm pin configurations 19-1802; rev 2; 4/05 evaluation kit available ordering information part t em p r a n g e pin - pa c k a g e top mark max1832 eut-t -40 c to +85? 6 sot23-6 aaot max1833 eut-t -40 c to +85? 6 sot23-6 aaou m a x1 8 3 3 e tt30- t -40 c to +85? 6 tdfn-6(t633-1) abx max1834 eut-t -40 c to +85? 6 sot23-6 aaov max1835 eut-t -40 c to +85? 6 sot23-6 aaow selector guide part output voltage output voltage in shutdown max1832eut-t adjustable v batt max1833eut-t fixed 3.3v v batt max1833ett30-t fixed 3.0v v batt max1834eut-t adjustable v batt - 0.7v max1835eut-t fixed 3.3v v batt - 0.7v 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:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v shdn = +1.5v, v out = +3.3v, v batt = +2v, gnd = 0, t a = -40? to +85?. typical values are at t a = +25?, 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. batt, lx to gnd.........................................................-6v to +6v lx to out ....................................................................-6v to +1v shdn to gnd..............................................-6v to (v out + 0.3v) out, fb, rst to gnd ............................................-0.3v to +6v lx current ................................................................................1a continuous power dissipation (t a = +70?) 6-pin sot23 (derate 9.1mw/? above +70?) ...........727mw 6-pin 3mm ? 3mm tdfn (derate 18.2mw/? above +70?) .........................................................1454.5mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) ................................+300? parameter symbol conditions min typ max units output range v out max1832/max1834 2.0 5.5 v battery input range v batt 1.5 5.5 v t a = +25 c 1.22 1.5 startup battery input voltage v su r load = 2.6k ? t a = -40 c to +85 c 1.24 v t a = +25 c 3.225 3.290 3.355 max1833eut/max1835eut t a = -40 c to +85 c 3.208 3.372 t a = +25 c 2.94 3.0 3.06 output voltage v out max1833ett30 t a = -40 c to +85 c 2.925 3.075 v t a = +25 c 1.208 1.228 1.248 fb trip voltage v fb max1832/max1834 t a = -40 c to +85 c 1.204 1.252 v t a = +25 c 3.5 20 fb input bias current i fb max1832/max1834, v fb = +1.3v t a = -40 c to +85 c 4.0 na t a = +25 c 0.4 1.2 n-channel on-resistance r nch v out = +3.3v i lx = 100ma t a = -40 c to +85 c 1.5 ? t a = +25 c 0.5 1.3 p-channel on-resistance r pch v out = +3.3v i lx = 100ma t a = -40 c to +85 c 1.6 ? p-channel catch-diode voltage i lx = 100ma, pch off, v out = +3.5v, v fb = +1.3v 0.73 v t a = +25 c 435 525 615 n-channel switch current limit i max v out = +3.3v t a = -40 c to +85 c 400 650 ma switch maximum on-time t on 3.5 5 6.5 ? t a = +25 c 2 17 34 synchronous rectifier zero-crossing current v out = +3.3v t a = -40 c to +85 c0 3 9 ma t a = +25 c 2.5 7.0 quiescent current into out(note 2) v out = +3.5v, v fb = +1.3v t a = -40 c to +85 c 8.0 ? shutdown current into out v out = +3.5v, v shdn = v fb = 0v 0.05 1 a downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection _______________________________________________________________________________________ 3 note 1: all units are 100% production tested at t a =+25?. limits over the operating temperature range are guaranteed by design and not production tested. note 2: supply current into out. this current correlates directly to the actual battery-supply current, but is reduced in value accord-ing to the step-up ratio and efficiency. parameter symbol conditions min typ max units reverse battery current intoout v out = 0, v batt = v shdn = v lx = -3v 0 10 ? t a = +25 c 1.8 5.0 quiescent current into batt v out = +3.5v, v fb = +1.3v t a = -40 c to +85 c 6.0 ? shutdown current into batt v out = +3.5v, v batt = +2v, v shdn = 0 0.001 1 a reverse battery current intobatt v out = 0, v batt = v shdn = v lx = -3v 0.002 10 ? shdn logic low v batt = +1.5v to +5.5v 0.3 v t a = +25 c 1.185 1.228 1.271 shdn threshold rising edge t a = -40 c to +85 c 1.170 1.286 v shdn threshold hysteresis 0.02 v shdn input bias current v out = +5.5v, v shdn = +5.5v, t a = +25 c 13 100 na shdn reverse battery current v out = 0, v batt = v shdn = v lx = -3v 52 150 ? t a = +25 c 2.830 2.980 3.110 max1833eut/max1835eut, falling edge t a = -40 c to +85 c 2.800 3.140 t a = +25 c 2.580 2.717 2.836 rst threshold max1833ett30 t a = -40 c to +85 c 2.553 2.863 v rst voltage low i rst = 1ma, v out = +2.5v 0.2 v t a = +25 c 0.1 100 rst leakage current v rst = +5.5v t a = -40 c to +85 c1 na t a = +25 c 1 100 lx leakage current v lx = +5.5v t a = -40 c to +85 c 100 na lx reverse battery current v out = 0, v batt = v shdn = v lx = -3v 0.001 10 ? maximum load current i load v batt = +2v, v out = +3.3v 150 ma efficiency v batt = +2v, v out = +3.3v, i load = 40ma 90 % electrical characteristics (continued)(v shdn = +1.5v, v out = +3.3v, v batt = +2v, gnd = 0, t a = -40? to +85?. typical values are at t a = +25?, unless otherwise noted.) (note 1) downloaded from: http:///
typical operating characteristics (v out = +3.3v, v batt = +2v, unless otherwise noted.) (figure 1) 9565 0.1 10 100 1 1000 efficiency vs. load current (v out = 5.0v) max1832/35 toc01 i load (ma) efficiency (%) 70 75 80 85 90 v batt = +1.5v v shdn = v batt r1 = 309 ? r2 = 100k ? max1834 v batt = +2.7v v batt = +3.3v 0.1 10 1 100 1000 efficiency vs. load current (v out = 3.3v) max1832/35 toc02 i load (ma) efficiency (%) 9575 80 85 90 v batt = +2.7v v batt = +1.5v v batt = +2.0v v shdn = v batt max1835 0.1 10 11 0 1 0 0 efficiency vs. load current (v out = 2.5v) max1832/35 toc03 i load (ma) efficiency (%) 8570 75 80 v batt = +2.0v v batt = +1.5v v shdn = v batt r1 = 100k ? r2 = 100k ? c in = 20 f c out = 20 f max1834 0 50 150100 200 250 13 24 5 6 maximum output current vs. battery voltage max1832/35 toc04 v batt (v) i load (ma) v out = +3.3v v out = +5.0v v out = +2.5v 1.2 10 10k 1k 100 startup battery voltage vs. load resistance 1.71.4 1.3 1.6 1.5 max1832/35 toc05 r load ( ? ) v batt (v) v shdn = v batt v out = +5.0v v out = +3.3v v out = +2.5v -0.2 0.2 0 0.60.4 1.00.8 1.2 -6 -4 -3 -2 -5 -10123456 input current and output voltage vs. battery voltage (shutdown, no load) max1832/35 toc06 v batt (v) i batt ( a) i batt v shdn = 0 r load = max1833 v out 5 4 3 2 1 0 6 -1 v out (v) -50 50 0 150100 250200 300 -6 -4 -3 -2 -5 -10123456 input current and output voltage vs. battery voltage (shutdown, loaded) max1832/35 toc07 v batt (v) i batt (ma) i batt v shdn = 0 r load = 22 ? max1833 v out 5 4 3 2 1 0 6 -1 v out (v) -20 60 0 100 80 140 120 -40 -6 -4 -3 -2 -5 -10123456 input current and output voltage vs. battery voltage (on, no load) max1832/35 toc08 v batt (v) i batt ( a) i batt 3.5 3.0 2.5 1.5 0.5 0 4.0 -0.5 v out (v) 40 20 r load = v out 2.0 1.0 max1832?ax1835 high-efficiency step-up converters with reverse battery protection 4 _______________________________________________________________________________________ -50 50 0 150100 250200 300 350 400 -6 -4 -3 -2 -5 -10123456 input current and output voltage vs. battery voltage (on, loaded) max1832/35 toc09 v batt (v) i batt (ma) i batt 2.52.0 1.5 1.0 0.5 0 3.0 3.5 4.0 -0.5 v out (v) v out r load = 22 ? downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection in a sot23-6 _______________________________________________________________________________________ 5 2ms/div on/off response v out 1v/div max1832/35 toc10 v shdn = v batt = 2.0v, r load = 22 ? , v out = 3.3v v batt 1v/div 40 s/div load transient i load 100ma/div max1832/35 toc11 r load = 22 ? to 200 ? , v out = +3.3v, v batt = +2.0v v out 100mv/div 0 40 s/div line transient v out 50mv/div max1832/35 toc12 i out = 100ma, v out = +3.3v, v batt = +2.0v to +2.5v v batt 500mv/div 10 s/div switching waveforms v lx 2v/div max1832/35 toc14 i out = 40ma, v out = +3.3v, v batt = +2.0v v lx 500ma/divv out 100mv/div 40 s/div shutdown response v out 1v/div max1832/35 toc13 r load = 22 ? , v batt = 3.3v, v batt = 2.0v v shdn 1v/div 0 0 max1833 typical operating characteristics (continued) (v out = +3.3v, v batt = +2v, unless otherwise noted.) (figure 1) downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection 6 _______________________________________________________________________________________ 10 h gnd rst +1.5v to +3.3v out output+3.3v power-onreset batt battery shdn lx max1833max1835 100k ? 10 f r4 220k ? r3 1m ? c110nf 10 f 10 h gnd fb +1.5v to +5.0v out output+5.0v batt battery shdn lx max1832max1834 r2309k ? r1100k ? r3 1m ? r4 220k ? c1 10nf 10 f pin description pin max1832max1834 max1833max1835 name function 11 shdn s hutd ow n. a hi g h l og i c l evel tur ns on the d evi ce. w hen shd n i s l ow the p ar t i s off, and the cur r ent i nto batt i s typ i cal l y 0.1?. for the m ax 1832/m ax 1833, the b atter y i s connected to ou t thr oug h an i nter nal p fe t and the exter nal i nd uctor w hen shd n i s l ow . shd n can b e used for l ow - b atter y cutoff ( 1.228v thr eshol d ) . s ee low - batter y c utoff . shd n has r ever se b atter y p r otecti on. 2 2 batt battery voltage connection. batt has reverse battery protection. 3 3 gnd ground 44l x inductor connection. n-channel mosfet switch drain and synchronousrectifier p-channel switch drain. lx has reverse battery protection. 5 5 out output voltage. bootstrapped supply for the device. output sense point formax1833/max1835. 6f b max1832/max1834 feedback input. set the output voltage through aresistor-divider network. see setting the output voltage . ? rst max1833/max1835 power-on reset open-drain output. rst pulls low when the output is 10% below the regulation point. if not used, connect to gnd.rst is high impedance in shutdown. figure 1a. max1833/max1835 typical operating circuit figure 1b. max1832/max1834 typical operating circuit downloaded from: http:///
detailed description the max1832?ax1835 compact, high-efficiencystep-up converters feature 4? quiescent supply cur- rent to ensure the highest possible efficiency over a wide load range. with a minimum +1.5v input voltage, these devices are well suited for applications with two alkaline cells, two nickel-metal-hydride (nimh) cells, or one lithium ion (li+) cell. for the max1832 and max1833, the battery is connected to out through the inductor and an internal pfet when shdn is low. this allows the input battery to be used as a backup or real-time clock supply when the converter is off by eliminat- ing the voltage drop across the pfet body diode. the max1832?ax1835 are ideal for low-power appli- cations where ultra-small size is critical. these devices feature built-in synchronous rectification that signifi- cantly improves efficiency and reduces size and cost by eliminating the need for an external schottky diode. furthermore, these devices are the industry? first boost regulators to offer complete reverse battery protection. this proprietary design protects the battery, ic, and the circuitry powered by the ic in the event the input bat- teries are connected backwards. control scheme a current-limited control scheme is a key feature of themax1832?ax1835. this scheme provides ultra-low quiescent current and high efficiency over a wide out- put current range. there is no oscillator. the inductor current is limited by the 0.5a n-channel current limit or by the 5? switch maximum on-time. following each on-cycle, the inductor current must ramp to zero before another cycle may start. when the error comparator senses that the output has fallen below the regulation threshold, another cycle begins. an internal synchronous rectifier eliminates the need for an external schottky diode reducing cost and board space. while the inductor discharges, the p-channel mosfet turns on and shunts the mosfet body diode. as a result, the rectifier voltage drop is significantly reduced, improving efficiency without adding external components. reverse battery protection the max1832?ax1835 have a unique proprietarydesign that protects the battery, ic, and circuitry pow- ered by the ic in the event that the input batteries are connected backwards. when the batteries are connect- ed correctly, the reverse battery protection n-channel mosfet is on and the device operates normally. when the batteries are connected backwards, the reverse battery protection n-channel mosfet opens, protecting the device and load (figures 2 and 3).previously, this level of protection required additional circuitry and reduced efficiency due to added compo- nents in the battery current path. applications information shutdown when shdn is low, the device is off and no current is drawn from the battery. when shdn is high, the device is on. if shdn is driven from a logic-level output, the logic high (on) level should be referenced to v out to avoid intermittent turn on. if shdn is not used at all, connect it to out. with shdn connected to out, the max1834/max1835 startup voltage (1.65v) is slightlyhigher, due to the voltage across the pfet body diode. the shdn pin has reverse battery protection. in shutdown, the max1832/max1833 connect the bat-tery input to the output through the inductor and the internal synchronous rectifier pfet. this allows the input battery (rather than a separate backup battery) to pro- vide backup power for devices such as an idled micro- controller, sram, or real-time clock, without the usual diode forward drop. if the output has a residual voltage during shutdown, a small amount of energy will be transfered from the output back to the input immediately after shutdown. this energy transfer may cause a slight momemntary ?ump?in the input voltage. the magni- tude and duration of the input bump are related to the ratio of c in and c out and the ability of the input to sink current. with battery input sources, the bump will benegligible, but with power-supply inputs (that typically cannot sink current), the bump may be 100s of mv. in shutdown, the max1834/max1835 do not turn on the internal pfet and thus do not have an output-to-input current path in shutdown. this allows a separate back- up battery, such as a li+ cell, to be diode-connected at the output, without leakage current flowing to the input. the max1834/max1835 still have the typical input-to- output current path from the battery to the output, through the pfet body diode, in shutdown. low-battery cutoff the shdn trip threshold of the max1832?ax1835 can be used as a voltage detector, with a resistor-divider, to power down the ic when the battery voltage falls to a set level (figure 1). the shdn trip threshold is 1.228v. to use a resistor-divider to set the shutdownvoltage, select a value for r3 in the 100k ? to 1m ? range to minimize battery drain. calcuate r4 as follows: r4 = r3 ? (v off / v shdn - 1) v off is the battery voltage at which the part will shut down and v shdn = 1.228v. note that input ripple can max1832?ax1835 high-efficiency step-up converters with reverse battery protection _______________________________________________________________________________________ 7 downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection 8 _______________________________________________________________________________________ reset 1.1v rst out shdn n startup circuitry control logic driver max1833max1835 1.228v errorcomparator p n lx batt gnd n zero- crossing detector current limit reverse battery protection mosfet figure 3. max1833/max1835 simplified functional diagram fb out shdn startup circuitry control logic driver max1832max1834 1.228v errorcomparator p n lx batt gnd n zero- crossing detector current limit reverse battery protection mosfet figure 2. max1832/max1834 simplified functional diagram downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection _______________________________________________________________________________________ 9 sometimes cause false shutdowns. to minimize the effectof ripple, connect a low-value capacitor (c1) from shdn to gnd to filter out input noise. select a c1 value suchthat the r4 ? c1 time constant is above 2ms. power-on reset the max1833/max1835 provide a power-on reset out-put ( rst ). a 100k ? to 1m ? pullup resistor from rst to out provides a logic control signal. this open-drainoutput pulls low when the output is 10% below its regu- lation point. if not used, connect it to gnd. rst is high impedance in shutdown. setting the output voltage the output voltage of the max1832/max1834 isadjustable from +2v to +5.5v, using external resistors r1 and r2 (figure 1b). since fb leakage is 20na (max), select feedback resistor r1 to be 100k ? to 1m ? . calculate r2 as follows: where v fb = 1.228v. inductor selection the control scheme of the max1832?ax1835 permitsflexibility in choosing an inductor. a 10? inductor per- forms well for most applications, but values from 4.7? to 100? may also be used. small inductance values typi- cally offer smaller physical size. large inductance values minimize output ripple but reduce output power. output power is reduced when the inductance is large enough toprevent the maximum current limit (525ma) from being reached before the maximum on-time (5?) expires. for maximum output current, choose l such that: where r ind is the inductor series resistance, and r nch is the r ds(on) of the n-channel mosfet (0.4 ? typ). capacitor selection choose an output capacitor to achieve the desired out-put ripple percentage. where r is the desired output ripple in %. a 10? ceramic capacitor is a good starting value. the input capacitorreduces the peak current drawn from the battery and can be the same value as the output capacitor. a larger input capacitor can be used to further reduce ripple and improve efficiency. pc board layout and grounding careful printed circuit layout is important for minimizingground bounce and noise. keep the ic? gnd pin and the ground leads of the input and output filter capaci- tors less than 0.2in (5mm) apart. in addition, keep all connections to the fb and lx pins as short as possible. in particular, when using external feedback resistors, locate them as close to fb as possible. to maximize output power and efficiency and minimize output ripple voltage, use a ground plane and solder the ic? gnd directly to the ground plane. chip information transistor count: 953process: bicmos c la rv out out > 05 0525 2 2 .. % i a v a rr v out max batt min nch ind out () () . . = + () 0 525 2 0 525 2 vs a l vs a batt max batt min () () .. 1 0 525 5 0 525 () << () rr v v out fb 21 1 = ?? ? ?? ? manufacturer inductor phone coilcraft ds1608c-103do1606t-103 847-639-6400 sumida cdrh4d18-100 cr43-100 847-956-0666 murata lqh4n100k 814-237-1431 table 1. suggested inductors andsuppliers value (f) description manu- facturer phone 594/595 d- series tantalum sprague 603-224-1961 4.7 to 47 taj, tps- series tantalum avx 803-946-0690 4.7 to 10 x7r ceramic tdk 847-390-4373 4.7 to 22 x7r ceramic taiyo yuden 408-573-4150 table 2. suggested surface-mountcapacitors and manufacturers downloaded from: http:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection 10 ______________________________________________________________________________________ 6lsot.eps package outline, sot 6l body 21-0058 1 1 g 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:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection ______________________________________________________________________________________ 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:///
max1832?ax1835 high-efficiency step-up converters with reverse battery protection 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. 2.300.10 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 1.500.101.500.10 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:///

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