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general description the max4372 low-cost, precision, high-side current- sense amplifier is available in a tiny, space-saving sot23-5-pin package. offered in three gain versions (t = 20v/v, f = 50v/v, and h = 100v/v), this device operates from a single 2.7v to 28v supply and con- sumes only 30?. it features a voltage output that elimi- nates the need for gain-setting resistors and is ideal for today? notebook computers, cell phones, and other systems where battery/dc current monitoring is critical. high-side current monitoring is especially useful in bat- tery-powered systems since it does not interfere with the ground path of the battery charger. the input com- mon-mode range of 0 to 28v is independent of the sup- ply voltage and ensures that the current-sense feedback remains viable even when connected to a 2-cell battery pack in deep discharge. the user can set the full-scale current reading by choosing the device (t, f, or h) with the desired volt- age gain and selecting the appropriate external sense resistor. this capability offers a high level of integration and flexibility, resulting in a simple and compact cur- rent-sense solution. for higher bandwidth applications, refer to the max4173t/f/h data sheet. applications power-management systems general-system/board-level current monitoring notebook computers portable/battery-powered systems smart-battery packs/chargers cell phones precision-current sources pin configurations rs+ + 1 5 rs- max4372t/f/h sot23-5 ucsp weiv pot weiv pot (bumps on bottom) 2 3 4 out out v cc v cc gnd gnd 2 3 1 a b max4372t/f/h rs+ rs- pin configurations continued at end of datasheet. note: gain val ue s are a s follows: 20v/v for th e t v ersion, 50v/v for the f version, and 10 0v/v for the h version. ordering inform at ion c ontinued at end of dat ash eet. uc sp is a trademark of maxim int eg rated products, inc. + denotes a lead (pb )-free/rohs -c ompliant package. t = ta pe and reel. features low-cost, compact current-sense solution 30? supply current 2.7v to 28v operating supply 0.18% full-scale accuracy 0.3mv input offset voltage low 1.5 output impedance three gain versions available 20v/v (max4372t) 50v/v (max4372f) 100v/v (max4372h) high accuracy +2v to +28v common-mode range, functional down to 0v, independent of supply voltage available in a space-saving 5-pin sot23 package and 3 x 2 ucsp (1mm x 1.5mm) package low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output rs- out a/d converter v cc v cc gnd rs+ r sense v sense i load v in 0 to 28v +2.7v to +28v 0.1 f max4372t/f/h load/ battery typical operating circuit 19-1548; rev 5; 5/11 part max4372t euk-t max4372tesa -40c to +85c -40c to +85c temp range pin- package 5 sot23-5 8 so ordering information top mark adiu ? max4372tebt-t -40c to +85c 3 x 2 ucsp acx part max4372t euk+t +t max4372tesa -40 c to +85 c -40 c to +85 c temp range pin- packa ge 5 sot23-5 8 so ordering information top mark adiu ? max4372tebt+t -40 c to +85 c 3 x 2 ucsp acx functional diagrams pin configurations appear at end of data sheet. functional diagrams continued at end of data sheet. ucsp is a trademark of maxim integrated products, inc. available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maxim integrated.com. max4372t/f/h max4372t/f/h
v rs+ 2v v rs+ > 2v v rs+ 2v v rs+ > 2v v rs+ > 2v v rs+ > 2v, v sense rs+ = 5mv gain = 100v/v v cc = 0v, v = 28v gain = 20v/v or 50v/v conditions mv 100 v sense 150 full-scale sense voltage (note 4) v 0 28 v cmr common-mode input range (note 3) v 2.7 28 v cc operating voltage range (note 2) a -50 2 i rs- input bias current 0 2 -25 2 i rs+ 0 1 db 85 cmr common-mode rejection a 30 60 i cc supply current a 0.05 1.2 i rs+ , i rs- leakage current units min typ max symbol parameter 0.3 0.8 v sense = 100mv, v cc = 12v, v rs+ = 12v (note 7) 6 v sense = 100mv, v cc = 28v, v rs+ = 28v (note 7) 0.15 7 v sense = 100mv, v cc = 12v, v rs+ = 0.1v (note 7) 1 28 v sense = 6.25mv, v cc = 12v, v rs+ = 12v (note 8) % 0.15 total out voltage error (note 6) v sense = 100mv, v cc = 12v, v rs+ = 12v, t a = +25c (note 7) % 0.18 3 full-scale accuracy (note 5) t a = +25c v cc = v rs+ = 12v 0.3 1.3 1.1 t a = t min to t max v cc = v rs+ = 12v mv 1.9 v os input offset voltage (note 5) max4372_esa max4372_euk, _ebt max4372_esa max4372_euk, _ebt absolute maximum ratings electrical characteristics (v rs+ = 0 to 28v, v cc = 2.7v to 28v, v sense = 0v, r load = 1m , t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 1) low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratin gs 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. v cc , rs+, rs- to gnd ...........................................-0.3v to +30v out to gnd ...........................................................-0.3v to +15v differential input voltage (v rs+ - v rs- ) ..............................0.3v current into any pin..........................................................10ma continuous power dissipation (t a = +70c) 5-pin sot23 (derate 3.9mw/c above +70c)..........312.6mw 8-pin so (derate 7.4mw/c above +70c)................588.2mw 3 x 2 ucsp (derate 3.4mw/c above +70c) ...........273.2mw operating temperature range ...........................-40c to +85c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s). ................................+300c soldering temperature (reflow). ......................................+300c 2 maxim integrated max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output electrical characteristics (continued) (v rs+ = 0 to 28v, v cc = 2.7v to 28v, v sense = 0v, r load = 1m , t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 1) note 1: all devices are 100% production tested at t a = +25c. all temperature limits are guaranteed by design. note 2: guaranteed by psr test. note 3: guaranteed by out voltage error test. note 4: output voltage is internally clamped not to exceed 12v. note 5: v os is extrapolated from the gain accuracy tests. note 6: total out voltage error is the sum of gain and offset voltage errors. note 7: measured at i out = -500a (r load = 4k for gain = 20v/v, r load = 10k for gain = 50v/v, r load = 20k for gain = 100v/v). note 8: 6.25mv = 1/16 of 100mv full-scale voltage (c/16). note 9: the device will not reverse phase when overdriven. v rs + = 12v, v cc = 12v, c load rs+ = 10pf max4372t 20 v sens e = 20mv, gain = 20v/v khz 50 bw 275 v sense = 20mv, gain = 50v/v 200 v sense = 20mv, gain = 100v/v 110 -3db bandwidth max4372f max4372h v/v 100 gain 50 no sustained oscillations v sense = 100mv 1.5 r out v ol v v cc - v oh ol out output resistance pf 1000 capacitive-load stability v sense = 20mv % 5.5 gain accuracy v out = 2v, v rs+ > 2v v cc = 12v, v rs+ = 12v, c load = 10pf ms 0.1 saturation recovery time (note 9) v cc = 12v, v rs+ = 12v, v sense = 100mv, c load = 10pf ms 0.5 power-up time to 1% of final value db 75 85 psr power-supply rejection v sense = 6.25mv 0.25 2.5 t a = +25c t a = -40c to +85c v sense = 6.25mv to 100mv 20 v sense = 100mv to 6.25mv gain = 20v/v, v cc = 12v, v rs+ = 12v, c load = 10pf s 20 out settling time to 1% of final value to 100mv,v =12v v v rs + = 28v, v cc = 2.7v, i out = -500a, v sense = 250mv cc = 2.7v, 9 65 out low voltage (max4372t, max4372f) mv 2.6 i out = 10a i out = 100a v sense = -10mv v rs+ rs+ = 28v v cc = 2.7v, v 0.1 0.25 out high voltage 9 65 out low voltage (max4372h) mv 2.6 i out = 10a i out = 100a v sense = -10mv v = 12v conditions units min typ max symbol parameter maxim integrated 3 max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output typical operating characteristics (v cc = 12v, v rs+ = 12v, v sense = 100mv, t a = +25?, unless otherwise noted.) 25.0 27.5 30.0 32.5 35.0 supply current vs. supply voltage max4372 toc01 supply voltage (v) supply current ( a) 01 2 1 6 4 8 20 24 28 a v = +100v/v a v = +50v/v a v = +20v/v v sense = 5mv 0 5 10 15 20 25 30 35 40 -40 10 60 -15 35 85 supply current vs. temperature max4372t toc02 temperature (?) supply current ( a) v sense = 5mv 28.0 29.0 28.5 30.0 29.5 31.5 31.0 30.5 32.0 supply current vs. common-mode voltage max4372 toc03 common-mode voltage (v) supply current ( a) 01 2 1 6 4 8 20 24 28 a v = +100v/v a v = +50v/v a v = +20v/v v sense = 5mv -1.2 -0.8 -1.0 -0.2 -0.4 -0.6 0.4 0.2 0 0.6 010 5 15202530 total output error vs. supply voltage max4372 toc04 supply voltage (v) output error (%) g = +100v/v g = +50v/v g = +20v/v 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 010 5 15202530 total output error vs. common-mode voltage max4372t toc07 common-mode voltage (v) output error (%) g = +100v/v g = +50v/v g = +20v/v -1.0 -0.5 0.5 0 1.0 1.5 0100 50 150 200 250 300 total output error vs. v sense max4372t toc05 v sense (mv) output error (%) a v = +100v/v a v = +20v/v a v = +50v/v -45 -90 100 100k 10k 1k power-supply rejection vs. frequency -75 -85 -55 -65 -40 -70 -80 -50 -60 max4372t toc06 frequency (hz) psr (db) -1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 gain accuracy vs. temperature max4372t toc08 temperature ( c) gain accuracy (%) -40 10 60 -15 35 85 a v = +20v/v a v = +50v/v a v = +100v/v -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -40 10 60 -15 35 85 total output error vs. temperature max4372t toc09 temperature (?) total output error (%) a v = +50v/v a v = +100v/v a v = +20v/v 4 maxim integrated max4372t/f/h
v out v sense 600mv 200mv 30mv 10mv max4372t small-signal transient response max4372t toc10 20s/div v out v sense 1.5v 0.5v 30mv 10mv max4372f small-signal transient response max4372t toc11 20s/div v out v sense 3v 1v 30mv 10mv max4372h small-signal transient response max4372t toc12 20 s/div v out v sense 1v 3v 50mv 150mv max4372t large-signal transient response max4372t toc13 20s/div v out v sense 2.5v 7.5v 50mv 150mv max4372f large-signal transient response 20 s/div max4372t toc14 3 -8 1k 100k 10k 1m small-signal gain vs. frequency -7 max4372t toc16 frequency (hz) gain (db) -6 -5 -4 -3 -2 -1 0 1 2 g = 50v/v g = 20v/v g = 100v/v v sense = 20mv v out v sense 0 10v 0 100mv max4372h large-signal transient response 20s/div max4372t toc15 low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output typical operating characteristics (continued) (v cc = 12v, v rs+ = 12v, v sense = 100mv, t a = +25?, unless otherwise noted.) maxim integrated 5 max4372t/f/h
_______________detailed description the max4372 high-side current-sense amplifier fea- tures a 0 to 28v input common-mode range that is inde- pendent of supply voltage. this feature allows the monitoring of current flow out of a battery in deep dis- charge, and also enables high-side current sensing at voltages far in excess of the supply voltage (v cc ). current flows through the sense resistor, generating a sense voltage (figure 1). since a1? inverting input is high impedance, the voltage on the negative terminal equals v in - v sense . a1 forces its positive terminal to match its negative terminal; therefore, the voltage across r g1 (v in - v1-) equals v sense . this creates a current to flow through r g1 equal to v sense / r g1 . the transistor and current mirror amplify the current by a factor of . this makes the current flowing out of the current mirror equal to: i m = v sense / r g1 a2? positive terminal presents high impedance, so this current flows through r gd , with the following result: v2+ = r gd v sense / r g1 r1 and r2 set the closed-loop gain for a2, which ampli- fies v2+, yielding: v out = r gd v sense / r g1 (1 + r2 / r1) the gain of the device equals: v out = r gd (1 + r2 / r1) / r g1 v sense __________applications information recommended component values the max4372 operates over a wide variety of current ranges with different sense resistors. table 1 lists com- mon resistor values for typical operation of the max4372. choosing r sense given the gain and maximum load current, select r sense such that v out does not exceed v cc - 0.25v or 10v. to measure lower currents more accurately, use a high value for r sense . a higher value develops a higher sense voltage, which overcomes offset voltage errors of the internal current amplifier. in applications monitoring very high current, ensure r sense is able to dissipate its own i 2 r losses. if the resistor? rated power dissipation is exceeded, its value may drift or it may fail altogether, causing a differential voltage across the terminals in excess of the absolute maximum ratings. low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output max4372t/f/h gnd to load v in 0 to 28v 2.7v to 28v r1 r gd r g2 100k rs+ rs- r g1 100k r2 out v2+ v1+ v1- v2- v cc r sense i load i m v sense current mirror a1 a2 pin/bump description 1 3 ground 2 4 output voltage. v out is proportional to the magnitude of v sense (v rs+ - v rs- ). a2 a3 so function sot23 ucsp 3 1 supply voltage. use at least a 0.1f capacitor to decouple v cc from fast transients. 4 8 power connection to the external sense resistor a1 b1 5 6 load-side connection to the external sense resistor ? 2, 5, 7 no connection. not internally connected. b3 ? gnd out name v cc rs+ rs- n.c. pin bump figure 1. functional diagram 6 maxim integrated max4372t/f/h
using a pc board trace as r sense if the cost of r sense is an issue and accuracy is not critical, use the alternative solution shown in figure 2. this solution uses copper pc board traces to create a sense resistor. the resistivity of a 0.1-inch-wide trace of 2-ounce copper is about 30m/ft. the resistance tem- perature coefficient of copper is fairly high (approxi- mately 0.4%/?), so systems that experience a wide temperature variance must compensate for this effect. in addition, self-heating will introduce a nonlinearity error. do not exceed the maximum power dissipation of the copper trace. for example, the max4372t (with a maximum load cur- rent of 10a and an r sense of 5m) creates a full-scale v sense of 50mv that yields a maximum v out of 1v. r sense , in this case, requires about 2 inches of 0.1- inch-wide copper trace. ucsp applications information for the latest application details on ucsp construction, dimensions, tape carrier information, printed circuit board techniques, bump-pad layout, and recommend- ed reflow temperature profile, as well as the latest infor- mation on reliability testing results, go to the maxim's website at www.maxim-ic.com/ucsp to find the application note: ucsp? wafer-level chip-scale package. table 1. recommended component values full-scale load current, i load (a) gain (v/v) current-sense resistor, r sense (m ) 2.0 full-scale output voltage (full-scale v sense = 100mv), v out (v) 5.0 10.0 0.1 1000 20 100 50 2.0 100 50 5.0 10.0 1 100 20 2.0 100 50 5.0 2.0 100 50 5.0 10.0 5 20 20 10.0 10 10 20 0.1in copper 0.3in copper 0.3in copper input load/battery v cc v sense r sense gnd 2.7v to 28v rs+ rs- out max4372t/f/h figure 2. connections showing use of pc board low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output maxim integrated 7 max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output d t +t part max4372f euk+t -40c to +85c temp range pin-package 5 sot23-5 top mark adiv max4372fesa+t max4372h euk+t max4372hesa+t -40c to +85c -40c to +85c -40c to +85c 8 so 5 sot23-5 8 so max4372febt+t -40c to +85c 3 x 2 ucsp ? adiw ? acy max4372hebt+t -40c to +85c 3 x 2 ucsp acz ordering information (continued) + deno te s a lead(pb)- fr ee/rohs- co mpliant package. t = t ap e and ree l. rs- n.c. out 1 2 8 7 rs+ n.c. n.c. gnd v cc so + 3 4 6 5 max4372t/f/h pin configurations (continued) 6l, ucsp.eps note: ma x4 372_ebt uses package code b6-2. packa ge information for the latest package outline information and land patterns, 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. 5 sot23 u5+1 21-0057 90-0174 5 ucsp b6+2 21-0097 8 so s8+2 21-0041 90-0096 chip information process: bicmos 8 maxim integrated max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output soicn .eps package information (continued) for the latest package outline information and land patterns, 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. maxim integrated 9 max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output sot-23 5l .eps package information (continued) for the latest package outline information and land patterns, 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. 10 maxim integrated max4372t/f/h
low-cost, ucsp/sot23, micropower, high-side current-sense amplifier with voltage output revision history revision number revision date description pages changed 4 7/09 updated feature in accordance with actual performance of the product 1 5 updated v rst conditions to synchronize with tested material and added 5/11 lead-free designation 1, 2, 3, 8 11 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 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. ? 2011 maxim integrated the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. max4372t/f/h

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