????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuit 19-6257; rev 0; 3/12 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX14626.related . general description the MAX14626 current loop protector features a current- limit switch to prevent damage to the sensor devices due to faulty current loop conditions. the current-limit switch features a 25 i (typ) on-resistance and operates from a +2.3v to +36v input voltage range. the accurate current limit is set to 30ma, making the part ideal for protecting the sensor reading devices. the MAX14626 handles an overcurrent event in a con - tinuous current-limit mode. additional safety features include thermal shutdown to prevent overheating and reverse-input blocking to protect from being reverse con - nected into the sensor. the device is available in a tiny 6-pin (3mm x 3mm), tdfn exposed pad package and is specified over the -40 n c to +85 n c extended temperature range. applications industrial current loop control benefits and features s high performance low on-resistance 25 i (typ) accurate q 10% current limit +2.3v to +40v wide supply voltage range low operating current ultra-low temperature coefficient s robust protection for sensors avoids power dissipation issues compared to discrete solutions thermal shutdown reverse input protection s saves space in compact systems eliminates need for discrete ptc poly switch, zener diodes, and resistors 3mm x 3mm, 6-pin tdfn package ref supply out gnd adc r load in 4?20ma current ia sensor (4?20ma) current control and protection current limit gate control MAX14626 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector (all voltages referenced to gnd.) in to gnd .............................................................. -40v to +40v out to gnd ........................................................ -0.3v to +40v current into in ................................................ internally limited current into out .............................................................. 100ma continuous power dissipation (t a = +70 n c) tdfn (derate 23.8mw/ n c above +70 n c) ............... 1904.8mw operating temperature range ........................ -40 n c to +125 n c maximum junction temperature ..................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c tdfn junction-to-ambient thermal resistance ( b ja ) ............. 42 n c/w junction-to-case thermal resistance ( b jc ) .................... 9 n c/w absolute maximum ratings 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 . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. package thermal characteristics (note 1) dc electrical characteristics (i in = 50 f a to 24ma, t a = -40 n c to +85 n c, r load = 25 i to 1k i , unless otherwise noted. typical values are at i in = 10ma, r load = 250 i , and t a = +25 n c.) (note 2) parameter symbol conditions min typ max units supply voltage operating start voltage v in_st i in = 20 f a 2.3 v operating in voltage v in 36 v operating in to out drop voltage i in = 24ma 2.8 v quiescent current (normal mode: 4C20ma) i q r load p 250 i 40 56 f a quiescent current (current- limit mode: current > 25ma) i q i out = 30ma, v in = 5v, r load = 25 i 65 f a reverse current i rev v in = -36v, v out = 0v, current into out 0.01 0.3 f a in to out switch on-resistance r on v in = 4v, i out = 16ma 25 45 i forward current limit i lim v in = 36v 27 30 33 ma dynamic turn-on time t ss v in = 3v, time from v in applied to v out = 90% of v in (note 3) 10 f s turn-off time t off time from thermal shutdown (note 3) 20 f s current-limit reaction time t lim input current source from 20ma to 50ma (note 4) 50 f s current-limit overshoot voltage input current source from 0ma to 50ma 50 % input small signal bandwidth bw 2ma p dc i in p 24ma, d i in = 1ma p-p at 1k i > 10 khz
????????????????????????????????????????????????????????????????? maxim integrated products 3 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector note 2: all devices are 100% production tested at t a = +25 n c, unless otherwise noted. limits over the -40 n c to +85 n c operating temperature range are guaranteed by design. note 3: turn-on time and turn-off time are defined as the difference in the time between when the output voltage crosses 10% and 90% of the final output voltage. note 4: input current source can support voltage up to +40v (absolute maximum). current reaction time is defined as the settling time of the output current after a fault event. dc electrical characteristics (continued) (i in = 50 f a to 24ma, t a = -40 n c to +85 n c, r load = 25 i to 1k i , unless otherwise noted. typical values are at i in = 10ma, r load = 250 i , and t a = +25 n c.) (note 2) typical operating characteristics (v in = 24v, i in = 10ma, r load = 250 i , unless otherwise noted. typical values are at t a = +25 n c.) parameter symbol conditions min typ max units thermal protection thermal shutdown +150 n c thermal-shutdown hysteresis 20 n c quiescent i q vs. v in MAX14626 toc01 v in (v) 32 28 20 24 8 12 16 4 10 20 30 40 50 60 70 80 90 100 0 03 6 no load quiescent i q (a) quiescent i q vs. i in MAX14626 toc02 i in (ma) quiescent i q (a) 10 20 30 40 50 60 70 80 90 100 0 02 0 15 10 5 r l = 250i r l = 100i 95 80 50 65 -10 5 20 35 -25 quiescent i q vs. temperature MAX14626 toc03 temperature (c) quiescent i q (a) 10 20 30 40 50 60 70 80 90 100 0 -40 110 i in = 20ma i in = 10ma i in = 0ma i in = 4ma
????????????????????????????????????????????????????????????????? maxim integrated products 4 typical operating characteristics (continued) (v in = 24v, i in = 10ma, r load = 250 i , unless otherwise noted. typical values are at t a = +25 n c.) 50 95 80 50 65 -10 5 20 35 -25 on-resistance vs. temperature MAX14626 toc04 temperature (c) on-resistance ( i ) 0 -40 110 v in = +2.36v v in = +5v v in = +12v v in = +24v i out = 10ma 10 20 30 40 50 reverse current vs. v out MAX14626 toc05 v out (v) reverse current (na) 0 04 0 10 20 30 40 30 20 10 i in 0ma to 20ma MAX14626 toc06 2v/ div 10ma / div 1) ch1 v out 2v 100s 2) ch4 l in 100mv 100s 100s / div v out i in 1) 2) soft current limit: i in 15ma to 35ma MAX14626 toc07 5v/ div 10ma / div 1) ch1 v out 5v 100s 2) ch4 l in 100mv 100s 100s / div v out i in 1) 2) fault response (short to wire): i in 10ma to 100ma MAX14626 toc08 5v/ div 20ma / div 1) ch1 v out 5v 50s 2) ch4 l in 100mv 50s 50s / div v out i in 2) 1) MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector
????????????????????????????????????????????????????????????????? maxim integrated products 5 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector pin description pin configuration pin name function 1 in power input 2, 3, 4 i.c. internally connected. connect i.c. to gnd. 5 gnd ground 6 out switch output ep exposed pad. connect ep to gnd. connect to a large ground plane to maximize thermal performance. not intended as an electrical connection point. i.c. i.c. in gnd i.c. out 12 3 65 4 *ep tqfn MAX14626 top view + *connect ep to gnd
????????????????????????????????????????????????????????????????? maxim integrated products 6 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector detailed description the MAX14626 current loop protector features a current- limit switch to prevent damage to the sensor devices due to faulty current loop conditions. the current-limit switch features a 25 i (typ) on-resistance and operates from a +2.3v to +36v input voltage range. the accurate current limit is set to 30ma, making the part ideal for protecting the sensor reading devices. the MAX14626 handles an overcurrent event in a con - tinuous current-limit mode. additional safety features include thermal shutdown to prevent overheating and reverse input blocking to protect from being reverse con - nected into the sensor. reverse input protection the device features reverse input protection to protect the downstream sensor. when a reverse input voltage is detected, control circuitry turns off the internal fet and isolates the output from the input. thermal shutdown the device enters thermal shutdown when the die tem - perature exceeds +150 n c (typ). in thermal shutdown, the internal fets are turned off. when the die temperature drops by 20 n c, the device turns back on automatically. applications information figure 1 shows the device in a 4C20ma current loop sensor application. exposed pad and layout concerns connect the exposed pad to a large ground plane to maximize thermal performance. the exposed pad is not intended as an electrical connection point. to optimize the switch response time to output short- circuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. functional diagram ref supply out gnd in control and protection current limit gate control MAX14626
????????????????????????????????????????????????????????????????? maxim integrated products 7 MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector figure 1. 4C20ma current loop sensor application ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. * ep = exposed pad. 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. chip information process: bicmos part temp range pin- package top mark MAX14626ett+t -40 n c to +85 n c 6 tdfn-ep* avf package type package code document no. land pattern 6 tdfn t633+2 21-0137 90-0058 adc ia ia MAX14626 voltage spike and rf supression analog input module +input + - current loop sensor (4?20ma) current dc supply 19.2v to 32v -input r load = 250i adc MAX14626 voltage spike and rf supression analog input module +input -input r load = 250i
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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 8 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/12 initial release MAX14626 high-voltage reverse-input-capable 4C20ma current loop protector
|
