View MAX1878ETC_5561471.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

max1878 dual-output step-down and lcd step-up power supply for pdas ________________________________________________________________ maxim integrated products 1 19-2248; rev 2; 5/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. general description the max1878 dual power supply contains a step-down and step-up dc-dc converter in a small 12-pin tqfn package for use in pdas. the step-down dc-dc convert- er delivers over 500ma to an output as low as 1.25v for logic power. the step-up dc-dc converter delivers over 15ma and an output as high as 28v for a liquid crystal dis- play (lcd). with an input voltage from 2.0v to 5.5v the max1878 is intended for use in systems powered by a 2-cell alkaline or 1-cell lithium-ion (li+) battery. fast switching frequency allows the use of small inductors and capacitors, and the low 19? typical quiescent cur- rent allows high efficiency when the system is in standby mode. each output can be independently enabled. the max1878 is available in a small 0.75mm high 4mm x 4mm 12-pin tqfn package and requires no external fets. the max1878 evaluation kit is available to speed designs. ________________________applications personal digital assistants (pda) organizers/translators mp3 players gps receivers features evaluation kit available to speed designs two output voltages main output: 1.25v to v in lcd output: up to 28v 2.0v to 5.5v input range low 19 a quiescent supply current 1 a shutdown supply current high switching frequency for small external components small 0.75mm high 4mm x 4mm 12-pin tqfn package pin configuration max1878 input 2.0v to 5.5v on on off off main lcd lcd output up to 28v main output 1.25v to v in 10 h in ain1 ain2 on onlcd pgnd agnd pgndlcd fb lx fblcd lxlcd 0.1 f 10 h __________typical operating circuit evaluation kit available part temp range pin- package top mark MAX1878ETC+ -40? to +85? 12- tqfn - e p * aagc ordering information 12 11 10 4 5 lx ain1 6 in agnd on lxlcd 12 pgndlcd 3 987 pgnd fblcd fb ain2 ep* + max1878 onlcd tqfn 4mm x 4mm top view *connect ep to agnd. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad.
max1878 dual-output step-down and lcd step-up power supply for pdas 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. fb, fblcd, ain1, ain2, on, onlcd to agnd ......-0.3v to +6v ain2 to ain1..........................................................-0.3v to +0.3v ain1, ain2 to in ....................................................-0.3v to +0.3v in to pgnd...............................................................-0.3v to +6v lx to pgnd .................................................-0.3v to (v in + 0.3v) lxlcd to pgndlcd..............................................-0.3v to +30v pgnd, pgndlcd to agnd..................................-0.3v to +0.3v lx current .........................................................................800ma lxlcd current..................................................................500ma continuous power dissipation (t a = +70?) 12-pin tqfn (derate 24.4mw/? above +70?) ...........1.95w operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? electrical characteristics (v in = v ain = 2.5v, circuit of figure 1, t a = 0c to +85c , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units general input voltage range v in , v ain 2.0 5.5 v v in rising 1.92 2.0 undervoltage lockout threshold v uvlo v in falling 1.7 1.82 v undervoltage lockout hysteresis 100 mv v fb = v fblcd = 1.30v, v onlcd = 0v, step-down converter only 19 30 quiescent current i ain1 + i ain2 v fb = v fblcd = 1.30v 24 38 ? shutdown quiescent current v on = v onlcd = 0v 0 1 ? main output (step-down converter) output voltage adjustment range v main 1.25 v in v t a = +25? to +85? 1.225 1.250 1.275 fb regulation voltage v fb v in = v ain = 2v t a = 0? to +85? 1.220 1.280 v fb input bias current i fb v in = v ain = 2v 10 50 na v in = v ain = 2.5v 250 500 main output current (note 2) i main v main = 1.8v v in = v ain = 2.0v 200 350 ma line regulation i load = 150ma, v in = v ain = 2v to 3v, fb = gnd 1% load regulation v in = v ain = 2.5v, i load = 10ma to 150ma 1 % v in = v ain = 2v, i load = 150ma, v fb = 0.8v 150 dropout voltage v in = v ain = 3v, i load = 150ma, v fb = 0.8v 100 mv note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . package thermal characteristics (note 1) tqfn junction-to-ambient thermal resistance ( ja )...............41?/w junction-to-case thermal resistance ( jc )......................6?/w
max1878 dual-output step-down and lcd step-up power supply for pdas _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = v ain = 2.5v, circuit of figure 1, t a = 0c to +85c , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units lx max duty cycle v fb = 0.8v 100 % lx leakage current v on = 0v, v in = 5.5v 0.1 5 a v in = v ain = 2v, i lx = 300ma 0.55 0.95 lx p-channel on-resistance v in = v ain = 3v, i lx = 300ma 0.42 0.65 v in = v ain = 2v, i lx = 300ma 0.62 0.93 lx n-channel on-resistance v in = v ain = 3v, i lx = 300ma 0.46 0.65 lx current limit 330 550 800 ma idle mode threshold 70 135 220 ma lx minimum on-time t lxon 240 440 740 ns lx minimum off-time t lxoff 200 390 670 ns on input low voltage 2v < v in < 5.5v 0.4 v on input high voltage 2v < v in < 5.5v 1.3 v on input leakage current -1 1 a lcd output (step-up converter) lcd output voltage adjust range v lcd v in + 1v 28 v t a = +25? to +85? 1.225 1.250 1.275 fblcd regulation voltage v fblcd v in = v ain = 2v t a = 0? to +85? 1.220 1.280 v v ain = v in = 2v, i lxlcd = 150ma 2.8 5.0 lxlcd on-resistance v ain = v in = 3v, i lxlcd = 150ma 1.7 3.0 lxlcd current limit 140 280 440 ma lxlcd leakage current v lxlcd = 28v 0 1 ? v ain = v in = 2.5v, v lcd = 18v 1.5 7.6 lcd output current (note 3) i lcd v ain = v in = 2v, v lcd = 18v 1.4 6.6 ma fblcd input bias current i fblcd v ain = v in = 2v 10 50 na lcd line regulation v ain = v in = 2v to 3v, i load = 5ma, v lxlcd = 18v 1% lcd load regulation v ain = v in = 2.5v, i load = 1ma to 5ma, v lxlcd = 18v 1.3 % lxlcd maximum on-time t lxlcdon 5.1 9.8 17 ? 0.5 1.0 1.7 lxlcd minimum off-time t lxlcdoff v fblcd < 0.9v (soft-start) 1.3 2.6 4.4 ? onlcd input low voltage 2v < v ain = v in < 5.5v 0.4 v onlcd input high voltage 2v < v ain = v in < 5.5v 1.3 v onlcd input leakage current -1 1 a
max1878 dual-output step-down and lcd step-up power supply for pdas 4 _______________________________________________________________________________________ electrical characteristics (v in = v ain = 2.5v, circuit of figure 1, t a = -40c to +85c , unless otherwise noted.) (note 4) parameter symbol conditions min max units general quiescent current from ain i ain v fb = v fblcd = 1.30v 38 ? main output (step-down converter) fb regulation voltage v fb v ain = v in = 2v 1.212 1.288 v lx current limit 310 820 ma lx minimum on-time t lxon 240 740 ns lx minimum off-time t lxoff 200 670 ns lcd output (step-up converter) lxlcd current limit 130 450 ma lxlcd maximum on-time t lxlcdon 5.1 17 ? 0.5 1.7 lxlcd minimum off-time t lxlcdoff v fblcd < 0.9v 1.3 4.5 ? fblcd regulation voltage v fblcd v ain = v in = 2v 1.212 1.288 v note 2: main output current is guaranteed by lx current limit, lx on resistance, and lx minimum off-time. note 3: lcd output current is guaranteed by lxlcd current limit, lxlcd on-resistance, and lxlcd minimum off-time, starting into a resistive load. note 4: specifications to t a = -40? are guaranteed by design and not production tested.
max1878 dual-output step-down and lcd step-up power supply for pdas _______________________________________________________________________________________ 5 1.78 1.77 1.80 1.79 1.82 1.81 1.83 1.84 0.1 10 1 100 1000 step-down converter output voltage vs. load current (v main = 1.8v) max1878 toc04 load current (ma) v main (v) v in = 3.6v v in = 5.0v v in = 2.5v onlcd = pgndlcd 1.505 1.500 1.495 1.515 1.510 1.525 1.520 1.530 1.535 0.1 10 1 100 1000 step-down converter output voltage vs. load current (v main = 1.5v) max1878 toc05 load current (ma) v main (v) v in = 3.6v v in = 5.0v v in = 2.5v onlcd = pgndlcd 18.3 18.2 18.1 18.0 17.9 17.8 18.5 18.4 18.7 18.6 18.8 18.9 0.01 1 0.1 10 100 step-up converter output voltage vs. load current (v lcd = 18v) max1878 toc06 load current (ma) v main (v) v in = 5.0v (22 h) v in = 3.6v (15 h) v in = 2.5v (10 h) onlcd = pgndlcd 0 40 20 80 60 120 100 140 023 1 456 no load supply current vs. input voltage (v main = 1.8v, v lcd = 18v) max1878 toc07 input voltage (v) supply current ( a) step-up and step-down step-up step-down 0 0.4 0.2 0.8 0.6 1.0 1.2 24 356 step-down converter switching frequency vs. supply voltage max1878 toc08 supply voltage (v) switching frequency (mhz) v main = 1.5v v main = 1.8v i main = 150ma onlcd = pgndlcd 200 300 250 350 450 400 500 step-up converter current limit vs. input voltage max1878 toc09 supply voltage (v) current limit (ma) 23456 l2 = 22 h l2 = 15 h l2 = 10 h 40 60 50 80 70 90 100 0.1 10 1 100 1000 step-down converter efficiency vs. load current (v main = 1.8v) max1878 toc01 load current (ma) efficiency (%) v in = 2.5v v in = 3.6v v in = 5.0v onlcd = pgndlcd 40 60 50 80 70 90 100 0.1 10 1 100 1000 step-down converter efficiency vs. load current (v main = 1.5v) max1878 toc02 load current (ma) efficiency (%) v in = 2.5v v in = 3.6v v in = 5.0v onlcd = pgndlcd 40 30 60 50 80 70 90 100 0.01 1 0.1 10 100 step-up converter efficiency vs. load current (v lcd = 18v) max1878 toc03 load current (ma) efficiency (%) v in = 5.0v (22 h) v in = 3.6v (15 h) v in = 2.5v (10 h) on = pgnd typical operating characteristics (v in = v ain = 2.5v, circuit of figure 1, t a = +25?, unless otherwise noted.)
max1878 dual-output step-down and lcd step-up power supply for pdas 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v in = v ain = 2.5v, circuit of figure 1, t a = +25?, unless otherwise noted.) step-up heavy-load switching waveforms max1878 toc13 v lxlcd 10v/div 0 v out ac-coupled 100mv/div 1 s/div i lcd = 4.5ma, v lcd = +18v, v in = +2.5v, on = pgnd step-down load transient response max1878 toc14 v lx 2v/div i main 200ma/div v main ac-coupled 100mv/div 10 s/div i main = 10ma to 250ma, v main = +1.8v, v in = +2.5v, onlcd = pgndlcd step-up load transient response max1878 toc15 v lxlcd 10v/div i lcd 2ma/div v lcd ac-coupled 200mv/div 20 s/div i lcd = 1ma to 4ma, v lcd = +18v, v in = +2.5v, on = pgnd line transient response max1878 toc16 v in 3v to 2v v lcd ac-coupled 200mv/div v main ac-coupled 20mv/div 100 s/div v main = +1.8v, i main = 150ma, v lcd =18.0v, i lcd = 2.5ma soft-start and shutdown response max1878 toc17 i in 200ma/div v lcd 10v/div v main 1v/div v on = v onlcd 5v/div 400 s/div r main = 5.1 , r lcd = 9.09k step-down light-load switching waveforms max1878 toc10 v lx 1v/div 0 v main ac-coupled 50mv/div 4 s/div i main = 20ma, v main = +1.8v, v in = +2.5v, onlcd = pgndlcd step-down heavy-load switching waveforms max1878 toc11 v lx 1v/div 0 v main ac-coupled 20mv/div 1 s/div i main = 250ma, v main = +1.8v, v in = +2.5v, onlcd = pgndlcd step-up light-load switching waveforms max1878 toc12 v lxlcd 10v/div 0 v out ac-coupled 100mv/div 1 s/div i lcd = 2ma, v lcd = +18v, v in = +2.5v, on = pgnd
detailed description the max1878 step-down and step-up dc-dc convert- er operates from a 2.0v to 5.5v supply. consuming only 19? of quiescent supply current, the main step- down converter delivers over 500ma to an output as low as 1.25v and the lcd step-up converter delivers over 15ma and an output as high as 28v. the max1878 uses a unique proprietary current-limited control scheme that provides excellent performance and high efficiency. step-down converter control scheme the max1878 step-down converter uses a proprietary, current-limited control scheme to ensure high efficiency, fast transient response, and physically small external components. this control scheme is simple: when the output voltage is out of regulation, the error comparator begins a switching cycle by turning on the high-side switch. this switch remains on until the minimum on- time of 440ns expires and the output voltage regulates or the current-limit threshold is exceeded. once off, the high-side switch remains off until the minimum off-time of 390ns expires and the output voltage falls out of regu- lation. during this period, the low-side synchronous rec- tifier turns on and remains on until either the high-side switch turns on again or the inductor current approach- es zero. the internal synchronous rectifier eliminates the need for an external schottky diode. this control scheme allows the max1878 step-down converter to provide excellent performance throughout the entire load-current range. when delivering light loads, the high-side switch turns off after the minimum on-time and after the inductor current reaches the 135ma ideal mode threshold to reduce peak inductor max1878 dual-output step-down and lcd step-up power supply for pdas _______________________________________________________________________________________ 7 pin description pin name function 1in step-down converter power input. connect in to the step-down converter power source. bypass in to pgnd with a 10? or greater low-esr capacitor. 2lx step-down converter switching node. connect lx to the step-down converter output lc filter. lx swings between in and pgnd. 3 ain1 analog input power 1. ain1 supplies power to the max1878 internal circuitry. connect ain1 to the 2.0v to 5.5v input power source. bypass ain1 to agnd with a 1? or greater low-esr capacitor. 4 ain2 analog input power 2. connect ain1 and ain2 together as close to the max1878 as possible. 5fb step-down converter feedback input. connect a resistive voltage-divider from the step-down converter output voltage to fb. the regulation threshold is 1.25v at fb. 6 fblcd lcd step-up converter feedback input. connect a resistive voltage-divider from the step-up converter output voltage to fblcd. the regulation threshold is 1.25v at fblcd. 7on step-down converter on/off input. drive on high to turn on the step-down converter. drive on low to turn off the converter. for automatic startup, connect on to ain1. 8 agnd analog (low-noise) ground. the exposed pad and the corner tabs on the tqfn package are internally connected to analog ground. see the pc board layout and grounding section. 9 lxlcd lcd step-up converter switching node. connect lxlcd to the step-up converter inductor and rectifier. 10 onlcd lcd step-up converter on/off input. drive onlcd high to turn on the step-up converter. drive onlcd low to turn off the converter. for automatic startup, connect onlcd to ain1. 11 pgndlcd lcd step-up converter power ground. pgndlcd is the source of the step-up converter? internal n-channel mosfet switch. connect pgndlcd to pgnd as close to the max1878 as possible. 12 pgnd power ground. pgnd is the source of the step-down converter? internal n-channel mosfet synchronous rectifier. connect pgnd to pgndlcd as close to the max1878 as possible. ?p exposed pad. internally connected to agnd. connect to a large analog ground (agnd) plane to maximize thermal performance. not intended to use as an electrical connection point.
max1878 current, resulting in increased efficiency and reduced output voltage ripple. when delivering medium and higher output currents, the max1878 extends either the on-time or the off-time, as necessary to maintain regula- tion, resulting in nearly constant frequency operation with high efficiency and low output voltage ripple. step-up converter control scheme the max1878 step-up converter features a minimum off-time, current-limited control scheme. the duty cycle is governed by a pair of one-shots that set a minimum off-time and a maximum on-time. the switching fre- quency can be up to 500khz and depends upon the load and input voltage. the peak current limit of the internal n-channel mosfet is 280ma. on/off control pulling on low places the max1878 step-down con- verter in shutdown mode and reduces step-down con- verter supply current to less than 1?. in shutdown, the internal switching mosfets and synchronous rectifier turn off and lx goes high impedance. pulling onlcd low places the max1878 step-up con- verter in shutdown mode and reduces step-up convert- er supply current to less than 1?. in shutdown, lxlcd enters a high-impedance state and the output remains connected to the input through the inductor and rectifi- er holding the output voltage to a diode drop below v in . the lcd output capacitance and load determine the rate at which v lcd decays. connect on and onlcd to in for normal operation. soft-start the max1878 internal soft-start circuitry limits current drawn at startup, reducing transients on the input source. soft-start is particularly useful for higher impedance input sources, such as lithium ion and alkaline cells. step-down converter soft-start is implemented with current limit. at startup the step-down converter current limit is set to 25% of its full current limit. the current limit is increased by 25% every 256 switching cycles until full current limit is reached. step-up converter soft-start is implemented with lxlcd minimum off-time. at startup the lxlcd minimum off-time is 2.6? allowing the lcd output voltage to build up gradually. when the output reaches approximately 80% of its final output voltage the lxlcd minimum off- time is decreased to its final value of 1?. see soft-start and shutdown response in the typical operating characteristics section. dual-output step-down and lcd step-up power supply for pdas 8 _______________________________________________________________________________________ max1878 v in 2.0v to 3.3v* two series alkaline cells c1 10 f r5 10 c2 1 f on on off off main lcd l2 10 h* d1 c5 5pf c3 0.1 f c6 20pf c4 22 f lcd output up to 28v main output 1.25v to v in r3 3.6m r4 270k r2 63.4k r6 2m r1 28k l1 10 h 1 3 4 7 10 in ain1 ain2 on onlcd 12 8 11 pgnd agnd pgndlcd 5 2 6 9 fb lx fblcd lxlcd *for input voltages greater than 3.3v use a higher value inductor l2. see inductor selection figure 1. max1878 standard application circuit
design procedure setting the output voltage set the max1878 step-down converter output voltage by connecting a resistive voltage-divider from v main to fb (figure 1). select an r2 from 30k to 300k . calculate r1 with the following equation: where v fb = 1.25v, r6 = 2m and v main may range from 1.25v to v in . set the max1878 step-up converter output voltage by connecting a resistive voltage-divider from v lcd to fblcd (figure 1). select an r4 from 30k to 300k . calculate r3 with the following equation: where v fblcd = 1.25v and v lcd may range from (v in + 1v) to 28v. the fb and fblcd input bias currents are a maximum of 50na. these small bias currents allow for large-value feedback resistors that improve light-load efficiency. for less than 1% output voltage error due to bias current, feedback resistors should be chosen such that the cur- rent through r2 is 100 times greater than i fb and the current through r4 is 100 times greater than i fblcd . rr v v lcd fblcd 34 1 = ? ? ? ? ? ? ? r rxr v v vrr v xr main fb fb main 1 26 62 2 = () + () ? ? max1878 dual-output step-down and lcd step-up power supply for pdas _______________________________________________________________________________________ 9 on off on off p n n max1878 v in control logic current limit current limit timers soft- start v main v lcd 7on 5fb 2lx 12 8 11 pgnd agnd pgndlcd 10 onlcd 6 fblcd 9 lxlcd in 1 ain1 3 ain2 4 figure 2. simplified functional diagram
max1878 inductor selection the max1878 is optimized to use a 10? inductor over the entire operating range. smaller inductance values typically offer smaller physical size for a given series resistance or saturation current. circuits using larger inductance values may startup at lower input voltages and exhibit less ripple, but also provide reduced output power. this occurs when the inductance is sufficiently large to prevent the maximum current limit from being reached before the maximum on-time expires. the inductor? saturation current rating should be greater than the peak switching current. however, it is generally acceptable to bias the inductor into saturation by as much as 20%, although this will slightly reduce efficien- cy. choose a low dc-resistance inductor to improve effi- ciency. for the above reasons choose the step-up converter inductor in the range of 10? to 33? depending on the input voltage (4? per volt of v in ). step-up converter diode selection the high maximum switching frequency of 500khz requires a high-speed rectifier such as the 1n4148. to maintain high efficiency, the average current rating of the diode should be greater than the peak switching current. choose a reverse breakdown voltage greater than the output voltage. a schottky diode is not recom- mended as the lower forward voltage does little to improve efficiency whereas the higher reverse leakage current decreases efficiency. input bypass capacitors bypass v in with a 10? low-esr surface-mount ceram- ic capacitor to pgnd and pgndlcd as close to the ic as possible. this input bypass capacitor reduces peak currents and noise at the input voltage source. connect ain1 and ain2 together and bypass with a low-esr 1? surface-mount ceramic capacitor to agnd. a low resistance (10 ) from in to ain1 and ain2 creates a lowpass rc filter and provides low-noise analog input power to the max1878. output filter capacitors the max1878 is a voltage mode converter and requires ripple at fb and fblcd for stable regulation. for most applications, bypass v lcd with a 0.1? small ceramic surface-mount capacitor to pgndlcd. for small ceramic capacitors, the output ripple voltage is domi- nated by the capacitance value. if tantalum or electrolyt- ic capacitors are used, the higher esr increases the output ripple voltage. decreasing the esr reduces the output ripple voltage and the peak-to-peak transient voltage. surface-mount capacitors are generally pre- ferred because they lack the inductance and resistance of their through-hole equivalents. bypass v main with a 10? to 47? tantalum capacitor to pgnd. choose a capacitor with 200m to 300m esr to provide stable switching while minimizing output ripple. a 22? filter capacitor works well for most applications. ripple regulation for proper switching control the ripple at fb and fblcd must be greater than 25mv. use r6 and c6 as shown in figure 1 to inject ripple into fb. to insure sufficient ripple on fblcd, connect c5 as shown in figure 1. pc board layout and grounding high switching frequencies make pc board layout a very important part of design. good design minimizes excessive emi on the feedback paths and voltage gra- dients in the ground plane, both of which can result in instability or regulation errors. connect the inductors, input filter capacitors, and output filter capacitors as close to the device as possible, and keep their traces short, direct, and wide. the external voltage-feedback networks should be very close to the feedback pins, within 0.2 inches (5mm). keep noisy traces, such as lx and lxlcd, away from the voltage feedback networks; also keep them separate, using grounded copper. the exposed backside pad and corner tabs of the tqfn package are internally connected to analog ground. for heat dissipation, connect the exposed backside pad to a large analog ground plane, prefer- ably on a surface of the board that receives good air- flow. connect all power grounds and all analog grounds to separate ground planes in a star ground configuration. connect the analog ground plane and the power ground plane together at a single point. the max1878 evaluation kit data sheet includes a proper pc board layout and routing scheme. dual-output step-down and lcd step-up power supply for pdas 10 ______________________________________________________________________________________
max1878 dual-output step-down and lcd step-up power supply for pdas ______________________________________________________________________________________ 11 chip information exposed pad connected to agnd process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 12 tqfn t1244+4 21-0139 90-0068
max1878 dual-output step-down and lcd step-up power supply for pdas maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 2 5/11 replaced qfn package with tqfn package and added exposed pad to pin description section 1, 7

▲Up To Search▲

Price & Availability of MAX1878ETC

	To Download MAX1878ETC Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .