mp8100 precision high-side current-sense amplifier mp8100 rev. 0.92 www.monolithicpower.com 1 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. the future of analog ic technology tm tm description the mp8100 is a low-cost, precision, high-side current-sense amplifier. this device operates from a single 2.5v to 18v supply and typically consumes 12a. it is ideal for today?s notebook computers, cell phones and other systems where battery/dc current monitoring is critical. high-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. the input common-mode range of 1.5v to 18v is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a 2-cell battery pack in deep discharge. features ? low-cost, compact current-sense solution ? 12a typical supply current ? 2.5v to 18v operating supply voltage ? 1.5v to 18v input common mode range ? 3a typical shutdown current ? 250v input offset voltage ? high current sensing capability ? low 100m ? output impedance (optional) ? available in an 8-pin soic package applications ? portable pcs ? pda?s ? smart battery packs ? cell phones ? portable test/measurement systems ? battery-operated systems ? energy management systems ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. typical application mp8100 rg1 vcc shdn gnd 3 7 1 4 6 8 5 rg2 out2 out1 c out2 100pf c out1 opt. load shutdown voltage -- + -- + v in r out2 opt.
mp8100 ? precision high-side current-sense amplifier mp8100 rev. 0.92 www.monolithicpower.com 2 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. tm package reference part number* package temperature MP8100DS soic8 ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP8100DS?z) for rohs compliant packaging, add suffix ?lf (eg. MP8100DS?lf?z) absolute maxi mum ratings (1) vcc, rg1, rg2 to gnd ............. ?0.3v to +20v maximum differential input voltage, rg1 to rg2 ............................................................... 5v storage temperature .............?65c to +150c recommended operating conditions (2) v cc , rg1, rg2 to gnd ................... 2.5v to 18v operating temperature .............?40c to +85c thermal resistance (3) ja jc soic8..................................... 90 ...... 42... c/w continuous power dissipation (t a =70c) ............................................... 800mw notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on approximately 1? square of 1 oz copper. electrical characteristics v cc = 10v, v shdn = 0v, t a = +25 c, unless otherwise noted. parameter symbol conditions min typ max units supply voltage v cc 2.5 18 v supply current i cc i load = 0a; v cc = 18v 12 30 a out1 input offset voltage v os1 0.25 1.20 mv out2 input offset voltage v os2 0.25 1.20 mv input bias current (4) i rg1 , i rg2 4 na out1 current accuracy i rg1 /i out1 v sense = 100mv 2 % no-load out1 error v sense = 0v 1 a low-level out1 error v sense = 5mv 2 a no-load out2 error v sense = 0v 1 a low-level out2 error v sense = 5mv 2 a power supply rejection ratio psrr 2.5v < v cc < 18v, v sense = 100mv 0.05 %/v shutdown supply current i cc(shdn) v shdn = 3v, v cc = 18v 3 5 a shdn threshold voltage v th_shutdown 0.7 1.0 1.8 v shdn hysteresis 0.03 v out1 output voltage range v out1 v cc ? 0.15 v out2 output voltage range v out2 v cc ? 1 v shdn nc rg1 gnd out2 vcc rg2 out1 1 2 3 4 8 7 6 5 top view
mp8100 ? precision high-side current-sense amplifier mp8100 rev. 0.92 www.monolithicpower.com 3 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. tm electrical characteristics (continued) v cc = 10v, v shdn = 0v, t a = +25 c, unless otherwise noted. parameter symbol conditions min typ max units t r 17 s out1 rise, fall time (4) t f v sense = 40mv, r out1 = 20k ? , r out2 = 100k ? , r g1 = r g2 = 2k ? , c out1 = 100pf, c out2 = 100pf, 10% to 90% 29 t r 18 s out2 rise, fall time (4) t f v sense = 40mv, r out1 = 20k ? , r out2 = 100k ? , r g1 = r g2 = 2k ? , c out1 = 100pf, c out2 = 100pf, 10% to 90% 26 maximum out1 current (4) i out1 500 a maximum out2 current (4) i out2 5 ma notes: 4) guaranteed by design. 5) input common mode range cannot exceed the supply voltage. pin functions pin # name description 1 shdn shutdown. connect to ground fo r normal operation. when high, supply current is less than 5a. 2 nc not connected. 3 rg1 gain resistor. connect to battery side of current-sense resistor through the gain resistor. 4 gnd ground or battery negative terminal. 5 out1 output for driving resistive loads. 6 rg2 gain resistor. connect to load side of cu rrent-sense resistor through the gain resistor. 7 vcc power input. connect to battery input. 8 out2 output for driving capacitive loads.
mp8100 ? precision high-side current-sense amplifier mp8100 rev. 0.92 www.monolithicpower.com 4 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. tm operation the mp8100 is a current-sense amplifier with a wide operating input voltage range of 2.5v to 18v. bias + enable shdn nc rg1 buffer error amplifier out2 rg2 out1 vcc gnd 8 7 6 5 1 2 3 4 -- + -- + figure 1?functional block diagram application information component selection table 1?suggested component values full-scale load current, i sense (a) current sense resistor (m ? ) gain setting resistor (k ? ) (r g1 = r g2 ) r out1 (k ? ) gain 0.1 500 2 20 10 1 50 2 20 10 5 10 2 20 10 10 5 2 20 10 the value of v out1 can be obtained with the equation: gain r i r r r i v s l 1 g 1 out s l out = = where r g1 is the sense resistor and i l is the load current.
mp8100 ? precision high-side current-sense amplifier notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp8100 rev. 0.92 www.monolithicpower.com 5 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. tm package information soic8 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o see detail "a" 0.0075(0.19) 0.0098(0.25) 0.150(3.80) 0.157(4.00) pin 1 id 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.004(0.10) 0.010(0.25) 0.189(4.80) 0.197(5.00) 0.053(1.35) 0.069(1.75) top view front view 0.228(5.80) 0.244(6.20) side view 14 85 recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation aa. 6) drawing is not to scale. 0.010(0.25) bsc gauge plane
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