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max9643 60v high-speed precision current-sense amplifier ????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuit 19-5889; rev 0; 8/11 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/max9643.related . general description the max9643 is a high-speed 60v precision unidirec - tional current-sense amplifier ideal for a wide variety of power-supply control applications. its high signal band - width allows its use within dc-dc switching converter power-supply control loops with minimal phase delay. the ic also features 50 f v (max) precision input offset voltage, allowing small sense resistors to be used in applications where efficiency is important and when wide dynamic-range current measurement is needed. high dc cmrr and ac cmrr make it easy to use in a wide variety of aggressive environments. the device is available in fixed gains of 2.5v/v and 10v/v. it is also available in a small, 8-pin tdfn (2mm x 3mm) package and is rated over the -40 n c to +125 n c temperature range. applications industrial and automotive power supplies gsm base station power supply high-brightness led control automotive engine control h-bridge motor control benefits and features s supports high-voltage applications ? wide input v cm = -1.5v to +60v s delivers high-speed operation ? 15mhz bandwidth s increases system accuracy ? precision v os = 50v (max) s -40 n c to +125 n c specified temperature range evaluation kit available load boost power-supply control cp1 rs+ rs- out gnd v cc cp2 v ee max9643 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 max9643 60v high-speed precision current-sense amplifier rs+ to gnd, rs- to gnd (note 1) ....................... -3.5v to +65v rs+ to rs- .......................................................................... q 15v v cc to gnd ........................................................... -0.3v to +40v v cc > 4.5v out to gnd ..................................................... -0.3v to +4.5v v ee to gnd ...................................................... +0.3v to -4.5v cp1 to gnd ...................................................... -0.3v to +4.5v v cc 4.5v out to gnd ......................................... -0.3v to (v cc + 0.3v) v ee to gnd ........................................ +0.3v to (-v cc + 0.3v) cp1 to gnd .......................................... -0.3v to (v cc + 0.3v) cp2 to gnd ............................................. (v ee - 0.3v) to +0.3v short-circuit duration ................................................ continuous continuous input current into any pin ............................ q 20ma esd on rs+, rs- ....................................................... q 4kv hbm esd on all other pins ................................................ q 2kv hbm maximum power dissipation tdfn-ep (derate 16.7mw/ n c at +70 n c) ................ 1333.3mw operating temperature range ........................ -40 n c to +125 n c junction temperature ..................................................... +150 n c lead temperature (10s, soldering) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c tdfn junction-to-ambient thermal resistance ( b ja ) ......... 60 n c/w junction-to-case thermal resistance ( b jc ) .............. 11 n c/w absolute maximum ratings note 2: 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 2) electrical characteristics (v cc = 5v, v rs+ = v rs- = 12v, t a = -40 n c to +125 n c, unless otherwise noted.) (note 3) note 1: voltages below -3.5v are allowed, as long as the input current is limited to 5ma by an external resistor. parameter symbol conditions min typ max units dc characteristics input common-mode voltage range v rs+ , v rs- v cc r 5v, guaranteed by cmrr test, v sense p 100mv -1.5 +60 v v cc < 5v, guaranteed by cmrr test, v sense p 100mv 3.5 - v cc 60 input offset voltage (notes 4, 5) v os t a = +25 n c 10 50 f v -40 n c < t a <+125 n c 400 common-mode rejection ratio (note 5) cmrr -1.5v p v cm p 60v, t a = +25 n c 120 130 db -1.5v p v cm p 60v, -40 n c p t a p +125 n c 110 cmrr vs. frequency (note 5) ac cmrr f = 100khz 90 db input bias current i rs+ , i rs- t a = +25 n c 35 60 f a -40 n c < t a < +125 n c 60 input bias current, v cc = 0v, v rs+ = v rs- = 60v i rs+ , i rs 25 f a input offset current (note 6) i rs+ - i rs- t a = +25 n c 0.02 0.15 f a -40 n c < t a < +125 n c 0.3 maximum sense voltage before input saturation fs v cm < 2v 100 mv v cm r 2v max9643t 400 max9643u 300
????????????????????????????????????????????????????????????????? maxim integrated products 3 max9643 60v high-speed precision current-sense amplifier note 3: all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design and/or characterization. note 4: gain and offset voltage are calculated based on two point measurements: v sense1 = 10mv and v sense2 = 100mv. note 5: v os , v ol , cmrr, and psrr are measured with the charge pump off. note 6: guaranteed by design and/or characterization. note 7: the maximum v sense of the max9643t is 400mv. with the gain = 2.5v/v, the output swing high is not applicable to the max9643t. electrical characteristics* (continued) (v cc = 5v, v rs+ = v rs- = 12v, t a = -40 n c to +125 n c, unless otherwise noted.) (note 3) parameter symbol conditions min typ max units voltage gain (note 4) max9643t 2.5 v/v max9643u 10 voltage gain error (note 4) ge t a = +25 n c 0.06 0.5 % -40 n c < t a < +125 n c 0.6 ac characteristics signal bandwidth bw v sense = 25mv dc + 2mv p-p , max9643t 15 mhz v sense = 25mv dc + 2mv p-p , max9643u 10 slew rate sr v out = 10mv to 110mv 12 v/ f s delay from output saturation to v ol v sense = 0 to 20mv 100 ns delay from input saturation and delay from output saturation to v oh v sense = 10v to 10mv 1 f s output characteristics output short-circuit current i sc 3.39 ma output-voltage low (max9643t) (note 5) v ol i out = 100 f a sink, t a = +25 n c 0.2 1 mv i out = 100 f a sink, -40 n c < t a < +125 n c 1 i out = 1ma sink, t a = +25 n c 0.6 10 i out = 1ma sink, -40 n c < t a < +125 n c 10 output-voltage low (max9643u) (note 5) v ol i out = 100 f a sink, t a = +25 n c 0.5 3 mv i out = 100 f a sink, -40 n c < t a < +125 n c 3 i out = 1ma sink, t a = +25 n c 0.6 10 i out = 1ma sink, -40 n c < t a < +125 n c 10 output-voltage high (note 7) v oh i out = 1ma source, v cc < 4.5v v cc - 1.3 v i out = 1ma source, v cc r 4.5v 3.2 2.3 capacitive drive capability cl r load = open, no sustained oscillation 30 pf power-supply characteristics power supply v cc guaranteed by psrr 2.7 36 v power-supply rejection ratio (note 5) psrr v cc = 2.7v to 36v, v sense = 10mv, t a = +25 n c 107 125 db -40 n c < t a < +125 n c 100 quiescent supply current i cc t a = +25 n c 1000 1400 f a -40 n c < t a < +125 n c 1600 charge-pump current i ee d v ee = 500mv 4 ma
????????????????????????????????????????????????????????????????? maxim integrated products 4 max9643 60v high-speed precision current-sense amplifier typical operating characteristics (v cc = 5v, v rs+ = v rs- = 12v, t a = -40 n c to +125 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design and/or characterization.) input offset voltage histogram max9643 toc01 occurrence (%) input offset voltage (v) 25 20 -20 -15 -10 0 5 10 -5 15 5 10 15 20 25 30 35 30 40 0 supply current vs. supply voltage max9643 toc02 supply voltage (v) supply current (ma) 30 20 10 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.5 04 0 supply current vs. temperature max9643 toc03 temperature (c) supply current (ma) 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.5 -50 125 100 75 25 50 0 -25 gain error vs. common-mode voltage max9643 toc04 common-mode voltage (v) gain error (%) 50 40 20 30 10 0 -10 60 0.02 0.04 0.06 0.08 0.12 0.14 0.16 0.18 0.20 0 0.10 0.02 0.04 0.06 0.08 0.12 0.14 0.16 0.18 0.20 0 0.10 gain error vs. temperature temperature (c) gain error (%) 100 75 25 50 0 -25 -50 125 max9643 toc05 common-mode rejection ratio vs. frequency (v cm_ac = 100mv) max9643 toc06 frequency (khz) common-mode rejection ratio (db) 10,000 1000 100 10 -120 -100 -80 -60 -40 -20 0 -140 1 100,000
????????????????????????????????????????????????????????????????? maxim integrated products 5 max9643 60v high-speed precision current-sense amplifier typical operating characteristics (continued) (v cc = 5v, v rs+ = v rs- = 12v, t a = -40 n c to +125 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design and/or characterization.) power-supply rejection ratio vs. frequency max9643 toc07 frequency (khz) power-supply rejection ratio (db) 1000 100 10 -120 -100 -80 -60 -40 -20 0 -140 1 10,000 small signal vs. frequency (max9643t) max9643 toc08 frequency (khz) small-signal gain (db) -6 -8 -4 -2 0 2 4 6 8 10 12 14 16 18 20 -10 10,000 1000 100 10 1 100,000 supply current vs. supply voltage max9643 toc09 supply voltage (v) supply current (ma) 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 0.50 04 0 35 30 20 25 10 15 5 supply current vs. temperature max9643 toc10 temperature (c) supply current (a) 100 75 25 50 0 -25 620 640 660 680 700 720 740 760 780 800 600 -50 125 output-voltage high vs. output source current max9643 toc11 output source current (ma) output-voltage high (v) 0.9 0.8 0.6 0.7 0.2 0.3 0.4 0.5 0.1 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 3.0 0 1.0 output-voltage low vs. output sink current max9643 toc12 output sink current (ma) output-voltage low (v) 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 100 200 300 400 500 600 0 0 1.0
????????????????????????????????????????????????????????????????? maxim integrated products 6 max9643 60v high-speed precision current-sense amplifier typical operating characteristics (continued) (v cc = 5v, v rs+ = v rs- = 12v, t a = -40 n c to +125 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design and/or characterization.) small-signal transient response max9643 toc13 gnd gnd output 10mv/div 200ns/div input 10mv/div max9643t large-signal transient response max9643 toc14 gnd gnd output 100mv/div 100ns/div input 100mv/div max9643t output high-saturation recovery response (input signal = 4v to 100mv) max9643 toc15 v rs_ gnd input 2v/div 1s/div output 1v/ div max9643t output low-saturation recovery response (input signal = 0v to 20mv) max9643 toc16 v rs_ gnd input 20mv/div 200ns/div output 50mv/ div max9643t startup delay (v sense = 200mv) max9643 toc17 gnd gnd v cc 5v/div 100s/div output 500mv/div max9643t input sense voltage saturation (v cm = 12v) max9643 toc18 gnd gnd v sense 1v/div 200s/div output 1v/ div max9643t input sense voltage saturation (v cm = 1.5v) max9643 toc19 gnd gnd v sense 500mv/div 200s/div output 200mv/div max9643t charge-pump noise max9643 toc20 gnd cp1 2v/div 1s/div output 20mv/div max9643t common mode (v cm = 0v to 10v) max9643 toc21 gnd gnd v cm 5v/div 20ns/div output 200mv/div max9643t
????????????????????????????????????????????????????????????????? maxim integrated products 7 max9643 60v high-speed precision current-sense amplifier pin configuration pin description pin name description 1 gnd ground 2 v ee charge-pump output. connect 1f to gnd. 3 cp1 positive terminal of 1f flying capacitor 4 cp2 negative terminal of 1f flying capacitor 5 rs+ positive sense resistor input 6 rs- negative sense resistor input 7 v cc power supply 8 out output ep exposed pad. must be externally connected to gnd. 1 + 34 86 5 out rs- rs+ max9643 2 7 v cc gnd cp1 ep cp2 v ee tdfn top view
????????????????????????????????????????????????????????????????? maxim integrated products 8 max9643 60v high-speed precision current-sense amplifier detailed description the max9643 is a high-speed precision current-sense amplifier ideal for a wide variety of high-performance industrial and automotive power-supply applications. the devices low input offset voltage, tight gain error, and low temperature drift characteristics allow the use of small- sense resistors for current measurements to improve power-supply conversion efficiency and accuracy of mea - surements. its fast response allows it to react quickly to switching currents as is common in power-supply circuits, and makes it possible to be used as part of control loops. the unidirectional high-side, current-sense amplifier also features a wide -1.5v to +60v input common-mode range. this feature allows monitoring of power-supply load current even if the rail is shorted to ground. high- side current monitoring does not interfere with the ground path of the load being measured, making the ic particu - larly useful in a wide range of high-reliability systems. the ic has been designed on a proprietary high-speed complementary bicmos soi process. this high-voltage analog process is optimized for excellent ac dynamic performance, ultra-low noise, wide operating voltage range, and low-drift signal conditioning circuitry. application information internal charge pump an internal charge pump on the part is utilized to provide two attractive application features: u input common-mode voltage range extends to 1.5v below ground. u output voltage range extends down to true ground. a 250khz internal charge pump is used to generate a negative voltage rail to bias both the input stage and output stage of the current-sense amplifier. use a 1 f f ceramic capacitor between the cp1 and cp2 pins of the ic, and ensure a tight layout to minimize loop area. using a 1 f f ceramic capacitor from v ee to gnd is essential to good low-noise performance. it is possible to also connect the v ee pin directly to an external -5v power supply. ensure that this voltage is lower than the internally generated charge-pump voltage. the max9643 ev kit shows a good example layout. a representation is shown in figure 1. input common-mode voltage range the use of an internal negative voltage rail for its input stage allows the current-sense amplifier to extend its input common-mode voltage below ground without any crossover inaccuracies. crossover problems with precision can occur with alternate architectures of current-sense amplifiers that use two different input differential stages to cover the entire operating common- mode voltage range (either npn/pnp transistors or pnp transistor and resistor-based input stages). the minimum input common-mode voltage capability is dependent on the internal negative voltage rail gener - ated by the charge pump. since this negative voltage rail goes down at low values of v cc (i.e., when under 5v), the minimum input common-mode voltage rail is also limited at low v cc . the negative input common-mode voltage specification can be exceeded if the input current is limited to under 5ma. this is typically accomplished by using series input resistors. the input esd structure for negative input common-mode voltages looks like 5 series-connected diodes. assuming an on-drop of 0.7v per diode, negative figure 1. pcb layout 1 + 34 86 5 max9643 2 7 from r sense to adc 0.1f 0.1f 0.1f 1f 1f
????????????????????????????????????????????????????????????????? maxim integrated products 9 max9643 60v high-speed precision current-sense amplifier input voltage transients below -3.5v should be limited by the use of input series resistors. for example, if an input voltage transient or fault condition of -12v were to occur in the application, use a resistor greater than 8.5v/5ma = 1700 i . use 2k i for margin. the maximum input common-mode voltage extends up to 60v over the entire v cc range of 2.7v to 36v. it is rec - ommended to shield the device from overvoltages above its 65v absolute maximum rating to protect the device. output voltage range the internal negative voltage rail generated by the charge pump is also used to bias the output stage of the current-sense amplifier, allowing it to feature true v ol = 0v performance. this feature allows small sense voltages to be used and eases interface to other analog and mixed-signal ics. in reality, attaining true v ol = 0v specification is usually limited by the offset voltage of the current-sense amplifier since v out = v os x gain, when input v sense = 0v. in addition, the maximum output voltage of the ic is inter - nally clamped to less than 5v even when it is powered from a 40v rail. this allows easy interface to low-voltage downstream circuitry without worrying about protecting them from large input voltage transients or faults. choosing the sense resistor choose r sense based on the following criteria: u voltage loss: a high r sense value causes the power-source voltage to reduce due to ir drop. for minimal voltage loss, use the lowest r sense value. u accuracy: a high r sense value allows lower currents to be measured more accurately. this is because input offset voltages become less significant when the sense voltage is larger. u efficiency and power dissipation: at high current levels, the i 2 r losses in r sense can be significant. take this into consideration when choosing the resis - tor value and its power dissipation (wattage) rating. also, the sense resistors value might drift if it is allowed to heat up excessively. u inductance: keep inductance low if i sense has a large high-frequency component. because of the high currents that flow through r sense , take care to eliminate parasitic trace resistance from causing errors in the sense voltage. either use a four-terminal current-sense resistor or use kelvin (force and sense) pcb layout techniques. power-supply bypassing and grounding for most applications, bypass v cc to gnd with a 0.1 f f ceramic capacitor. in many applications, v cc can be connected to one of the current monitor terminals (r s+ or r s- ). because v cc is independent of the monitored voltage, v cc can be connected to a separate regulated supply. there are no specific power-supply sequencing issues to consider. the part can withstand 60v input common-mode voltages even when v cc = 0v, and maintains a high input impedance in this application condition. ordering information + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. chip information process: bicmos part pin- package gain (v/v) temp range max9643tata+ 8 tdfn-ep* 2.5 -40 n c to +125 n c MAX9643UATA+ 8 tdfn-ep* 10 -40 n c to +125 n c
???????????????????????????????????????????????????????????????? maxim integrated products 10 max9643 60v high-speed precision current-sense amplifier 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. 8 tdfn-ep t823+1 21-0174 90-0091 8l, tdfn.eps package outline 21-017 4 2 1 b 8l tdfn, exposed pad, 2x3x0.8mm symbo l dimensions 3.00 2.95 0.75 nom. 0.70 min. 0.20 ref. 0.40 0.02 2.00 0.30 0.00 1.95 e a l a1 d a2 k 0.20 min. package outline 21-017 4 2 2 b 8l tdfn, exposed pad, 2x3x0.8mm 8 n 3.05 0.8 0 max. 0.50 0.05 2.05 0.50 bsc e b 0.25 0.18 0.30 1.60 min. 1.75 nom. 1.90 max. e2 1.50 min. 1.63 nom. 1.75 max. d2 t823-1 pkg . code exposed pad packag e
???????????????????????????????????????????????????????????????? maxim integrated products 11 max9643 60v high-speed precision current-sense amplifier 8l, tdfn.eps package outline 21-017 4 2 1 b 8l tdfn, exposed pad, 2x3x0.8mm symbo l dimensions 3.00 2.95 0.75 nom. 0.70 min. 0.20 ref. 0.40 0.02 2.00 0.30 0.00 1.95 e a l a1 d a2 k 0.20 min. package outline 21-017 4 2 2 b 8l tdfn, exposed pad, 2x3x0.8mm 8 n 3.05 0.8 0 max. 0.50 0.05 2.05 0.50 bsc e b 0.25 0.18 0.30 1.60 min. 1.75 nom. 1.90 max. e2 1.50 min. 1.63 nom. 1.75 max. d2 t823-1 pkg. code exposed pad packag e package information (continued) 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.
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 12 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max9643 60v high-speed precision current-sense amplifier revision history revision number revision date description pages changed 0 8/11 initial release

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