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| 1 micropower, rail-to-rail input current sense amplifier with voltage output isl28005 the isl28005 is a micropower, uni-directional high-side and low- side current sense amplifier featuring a proprietary rail-to-rail input current sensing amplifier. the isl28005 is ideal for high- side current sense applications where the sense voltage is usually much higher than the amplifier supply voltage. the device can be used to sense voltages as high as 28v when operating from a supply voltage as low as 2.7v. the micropower isl28005 consumes only 50a of supply current when operating from a 2.7v to 28v supply. the isl28005 features a common-mode input voltage range from 0v to 28v. the proprietary architecture extends the input voltage sensing range down to 0v, making it an excellent choice for low-side ground sensing applications. the benefit of this architecture is that a high degree of total output accuracy is maintained over the entire 0v to 28v common mode input voltage range. the isl28005 is available in fixed (100v/v, 50v/v and 20v/v) gains in the space saving 5 ld sot-23 package. the parts operate over the extended temperature range from -40c to +125c. features ? low power consumption. . . . . . . . . . . . . . . . . . . . . . 50a,typ ? supply range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.7v to 28v ? wide common mode input . . . . . . . . . . . . . . . . . . . . 0v to 28v ? fixed gain versions - isl28005-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100v/v - isl28005-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50v/v - isl28005-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20v/v ? operating temperature range. . . . . . . . . . .-40c to +125c ? package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ld sot-23 applications ? power management/monitors ? power distribution and safety ? dc/dc, ac/dc converters ? battery management /charging ? automotive power distribution related literature ? see an1531 for ?isl28005 evaluation board user?s guide? isl28005 gnd isl28005 isl28005 +5vdc +12vdc + - +1.0vdc +1.0vdc sense sense sense output +5vdc output +12vdc output multiple output power supply i sense +12vdc i sense +5vdc i sense +1.0vdc + - + - r sense +5vdc +5vdc +5vdc r sense r sense figure 1. typical application 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 time (ms) volts (v) v th(l-h) = 1.52v v th(h-l) = 1.23v v rs+ g100, v out = 1v g50, v out = 500mv g20, v out = 200mv v out (g=100) figure 2. high-side and low-side threshold voltage july 1, 2011 fn6973.4 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2009-2011. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners.
isl28005 2 fn6973.4 july 1, 2011 block diagram pin configuration isl28005 (5 ld sot-23) top view gnd r s- gm hi gm lo v sense 1.35v i mirror + - out r f r g r 1 r 5 v cc v sense r 2 r 3 i = 2.86a r s+ r 4 high-side low-side sensing and 1 2 3 5 4 v cc out gnd rs+ rs- fixed gain pin descriptions isl28005 (5 ld sot-23) pin name description 1gndpower ground 2 out amplifier output 3v cc positive power supply 4 rs+ sense voltage non-inverting input 5 rs- sense voltage inverting input rs- v cc rs+ gnd capacitively coupled esd clamp out capacitively coupled esd clamp isl28005 3 fn6973.4 july 1, 2011 ordering information part number (notes 1, 2, 3) gain part marking (note 4) package tape & reel (pb-free) pkg. dwg. # isl28005fh100z-t7 100v/v bdea 5 ld sot-23 p5.064a isl28005fh100z-t7a 100v/v bdea 5 ld sot-23 p5.064a isl28005fh50z-t7 50v/v bdda 5 ld sot-23 p5.064a isl28005fh50z-t7a 50v/v bdda 5 ld sot-23 p5.064a isl28005fh20z-t7 20v/v bdca 5 ld sot-23 p5.064a isl28005fh20z-t7a 20v/v bdca 5 ld sot-23 p5.064a isl28005fh-100eval1z 100v/v evaluation board isl28005fh-50eval1z 50v/v evaluation board isl28005fh-20eval1z 20v/v evaluation board notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb- free products are msl classified at pb-free peak reflow temperat ures that meet or exceed the pb-free requirements of ipc/jedec j std-020. 3. for moisture sensitivity level (msl), please see device information page for isl28005 . for more information on msl please see techbrief tb363 . 4. the part marking is located on the bottom of the part. isl28005 4 fn6973.4 july 1, 2011 absolute maximum rating s thermal information max supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..28v max differential input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20ma max differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5v max input voltage (rs+, rs-) . . . . . . . . . . . . . . . . . . . . . . . gnd-0.5v to 30v max input current for input voltage isl28005 6 fn6973.4 july 1, 2011 t s output settling time to 1% of final value v cc = v rs + = 12v, v out = 10v step, v sense >7mv 15 s v cc = v rs + = 0.2v, v out = 10v step, v sense >7mv 20 s capacitive-load stability no sustained oscillations 300 pf t s power-up power-up time to 1% of final value v cc = v rs + = 12v, v sense = 100mv 15 s v cc = 12v, v rs + = 0.2v v sense = 100mv 50 s saturation recovery time v cc = v rs + = 12v, v sense = 100mv, overdrive 10 s notes: 7. compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design. 8. definition of terms: ? v sense a = v sense @100mv ? v sense b = v sense @20mv ? v out a = v out @v sense a = 100mv ? v out b = v out @v sense b = 20mv ? g = 9. v os is extrapolated from the gain measurement. 10. % gain accuracy = g a = 11. output accuracy % v oa = where v out = v sense x gain and v sense = 100mv electrical specification v cc = 12v, v rs+ = 0v to 28v, v sense = 0v, r load = 1m ? , t a = +25c unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. temperature data established by characterization . (continued) parameter description conditions min (note 7) typ max (note 7) unit gain v out av out b ? v sense av sense b ? ----------------------------------------------------- - ?? ?? ?? = v os v sense a v out a g ---------------- - ? = g measured g expected ? g expected -------------------------------------------------------------------- - ?? ?? ?? 100 vout measured vout expected ? vout expected ------------------------------------------------------------------------------------------- ?? ?? ?? 100 isl28005 7 fn6973.4 july 1, 2011 typical performance curves v cc = 12v, r l = 1m, unless otherwise specified. figure 3. large signal transient response v rs+ = 0.2v, v sense = 100mv figure 4. large signal transient response v rs+ = 12v, v sense = 100mv figure 5. high-side and low-side threshold voltage v rs+(l-h) and v rs+(h-l) , v sense = 10mv figure 6. v out vs v rs+ , v sense = 20mv transient response figure 7. normalized v oa vs i out figure 8. gain vs frequency v rs+ = 100mv/12v, v sense = 100mv, v out = 250mv p-p 0 2 4 6 8 10 12 0 102030405060708090100 time (s) v out (v) gain 100 0 2 4 6 8 10 12 0 102030405060708090100 time (s) v out (v) gain 100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 time (ms) volts (v) v th(l-h) = 1.52v v th(h-l) = 1.23v v rs+ g100, v out = 1v g50, v out = 500mv g20, v out = 200mv v out (g = 100) 0 0.4 0.8 1.2 1.6 2.0 2.4 0 0.20.40.60.81.01.21.41.61.82.0 time (ms) v rs+ (v) 0 2 4 6 8 10 12 v out (v) r l = 1m vcc = 12v v out (g = 100) v rs+ g100, v out = 2v g50, v out = 1v g20, v out = 400mv -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 1 10 100 1m 10m i out (a) v oa percent accuracy (%) +25c -40c +125c gain 100 10 100 1k 10k 100k 1m frequency (hz) gain (db) -35 -25 -15 -5 5 15 25 35 45 gain 100 v cc = 12v a v = 100 r l = 1m v sense = 100mv v rs+ = 100mv v rs+ = 12v isl28005 8 fn6973.4 july 1, 2011 figure 9. normalized v oa vs i out figure 10. gain vs frequency v rs+ = 100mv/12v, v sense = 100mv, v out = 250mv p-p figure 11. normalized v oa vs i out figure 12. gain vs frequency v rs+ =100mv/12v, v sense = 100mv, v out = 250mv p-p typical performance curves v cc = 12v, r l = 1m, unless otherwise specified. (continued) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 1 10 100 1m 10m i out (a) v oa percent accuracy (%) +25c -40c +125c gain 50 10 100 1k 10k 100k 1m frequency (hz) gain (db) -35 -25 -15 -5 5 15 25 35 45 v cc = 12v a v = 100 r l = 1m v sense = 100mv gain 50 v rs+ = 100mv v rs+ = 12v -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 1 10 100 1m 10m i out (a) v oa percent accuracy (%) +25c -40c +125c gain 20 10 100 1k 10k 100k 1m frequency (hz) gain (db) -35 -25 -15 -5 5 15 25 35 45 v cc = 12v a v = 100 r l = 1m v sense = 100mv gain 20 v rs+ = 100mv v rs+ = 12v isl28005 9 fn6973.4 july 1, 2011 applications information functional description the isl28005-20, isl28005-50 and isl28005-100 are single supply, uni-directional current sense amplifiers with fixed gains of 20v/v, 50v/v and 100v/v respectively. the isl28005 is a 2-stage amplifier. figure 18 shows the active circuitry for high-side current sense applications where the sense voltage is between 1.35v to 28v. figure 19 shows the active circuitry for ground sense applicat ions where the sense voltage is between 0v to 1.35v. the first stage is a bi-level trans-conductance amp and level translator. the gm stage converts the low voltage drop (v sense ) sensed across an external milli-ohm sense resistor, to a current (@ gm = 21.3a/v). the trans- conductance amplifier forces a current through r 1 resulting to a voltage drop across r 1 that is equal to the sense voltage (v sense ). the current through r 1 is mirrored across r 5 creating a ground-referenced voltage at the input of the second amplifier equal to v sense . the second stage is responsible for the overall gain and frequency response performance of the device. the fixed gains (20, 50, 100) are set with internal resistors r f and r g . the only external component needed is a current sense resistor (typically 0.001 to 0.01 , 1w to 2w). the transfer function is given in equation 1. the input gm stage derives its ~2. 86a supply current from the input source through the rs+ term inal as long as the sensed voltage at the rs+ pin is >1.35v and the gm hi amplifier is selected. when the sense voltage at r s + drops below the 1.35v threshold, the gm lo amplifier kicks in and the gm lo output current reverses, flowing out of the rs- pin. test circuits and waveforms figure 13. i s, v os , v oa , cmrr, psrr, gain accuracy figure 14. input bias current, leakage current figure 15. slew rate, t s , saturation recovery time figure 16. gain vs frequency figure 17. slew rate rs+ v cc rs- v out out r l gnd v sense v rs+ 1m + - + - rs+ v cc rs- v out out r l gnd v sense v rs+ 1m + - + - r1 r2 v r1 v r2 rs+ v cc rs- v out out r l gnd v rs- v rs+ 1m pulse generator rs+ v cc rs- v out out r l gnd v sense v rs+ 1m signal generator rs+ v cc rs- v out out r l gnd v rs+ 1m pulse generator v out gain i s r s v os + () = (eq. 1) isl28005 10 fn6973.4 july 1, 2011 figure 18. high-side current detection r s+ r s- gm hi gm lo r s i s + - load v sense 1.35v i mirror + - out r f r g r 1 r 5 v cc high-side sensing optional transient protection optional filter capacitor ?v sense v cc = 2v to 28v r 2 r 3 r 4 i = 2.86a gnd v sense v rs+ = 2v to 28v figure 19. low-side current detection r s- gm hi gm lo r s i s + - load v sense 1.35v i mirror + - out r f r g r 1 r 5 v cc low-side sensing optional transient protection optional filter capacitor ?v sense v cc = 2v to 28v r 2 r 3 r 4 i = 2.86a v cc gnd v sense v rs+ = 0v to 2v r s+ isl28005 11 fn6973.4 july 1, 2011 hysteretic comparator the input trans-conductance amps are under control of a hysteretic comparator operatin g from the incoming source voltage on the rs+ pin (see figure 20). the comparator monitors the voltage on rs+ and switches the sense amplifier from the low-side gm amp to the high-side gm amplifier whenever the input voltage at r s + increases above the 1.35v threshold. conversely, a decreasing voltage on the rs+ pin, causes the hysteric comparator to switch from the high-side gm amp to the low-side gm amp as the voltage decreases below 1.35v. it is that low-side sense gm amplifier that gives the isl28005 the proprietary ability to sense current all the way to 0v. negative voltages on the r s + or r s - are beyond the sensing voltage range of this amplifier. typical application circuit figure 22 shows the basic app lication circuit and optional protection components for switched-load applications. for applications where the load and the power source is permanently connected, only an external se nse resistor is needed. for applications where fast transients are caused by hot plugging the source or load, external protec tion components may be needed. the external current limiting resistor (r p ) in figure 22 may be required to limit the peak current through the internal esd diodes to < 20ma. this condition can occur in applications that experience high levels of in-rush current causing high peak voltages that can damage the internal esd diodes. an r p resistor value of 100 ? will provide protection for a 2v transient with the maximum of 20ma flowing through the input while adding only an additional 13v (worse case over-temperature) of v os . refer to the following formula: ((r p x i rs- ) = (100 x 130na) = 13v) switching applications can generate voltage spikes that can overdrive the amplifier input and dr ive the output of the amplifier into the rails, resulting in a long overload recovery time. capacitors c m and c d filter the common mode and differential voltage spikes. error sources there are 3 dominant error sources: gain error, input offset voltage error and kelvin voltage error (see figure 21). the gain error is dominated by the internal resistance matching tolerances. the remaining errors appear as sense voltage errors at the input to the amplifier. they are v os of the amplifier and kelvin voltage errors. if the transient protection resistor is added, an additional v os error can result from the ixr voltage due to input bias current. the limiting re sistor should only be added to the r s - input, due to the high-side gm amplifier (gm hi ) sinking several micro amps of current through the rs+ pin. layout guidelines kelvin connected sense resistor the source of kelvin voltage errors is illustrated in figure 21. the resistance of 1/2 oz. copper is ~1m per square with a tc of ~3900ppm/c (0.39%/c). when you compare this unwanted parasitic resistance with the total of 1m to 10m resistance of the sense resistor, it is easy to see why the sense connection must be chosen very carefully. for example, consider a maximum current of 20a through a 0.005 sense resistor, generating a v sense = 0.1 and a full scale output voltage of 10v (g = 100). two side contacts of only 0.25 square per contact puts the v sense input about 0.5 x 1m away from the resistor end capacitor. if only 10a the 20a total current flows through the kelvin path to the resistor, you get an error voltage of 10mv (10a x 0.5sq x 0.001 /sq. = 10mv) added to the 100mv sense voltage for a sense voltage error of 10% (0.110v - 0.1)/0.1v) x 100. figure 20. gain accuracy vs v rs+ = 0v to 2v v rs+ (v) -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 accuracy (%) figure 21. pc board current sense kelvin connection pc board non-uniform current flow current sense resistor 1 to 10mo current in current out kelvin v s contacts copper trace 30mo/sq. pc board non-uniform current flow current sense resistor 1 to 10mo current in current out kelvin v s contacts copper trace 30mo/sq. current sense resistor 1m ? to 10m ? 1m ? /sq current out current in non-uniform current flow pc board kelvin v s contacts 1/2 oz copper trace isl28005 12 fn6973.4 july 1, 2011 overall accuracy (v oa %) v oa is defined as the total output accuracy referred-to-output (rto). the output accuracy contains all offset and gain errors, at a single output voltage. equation 2 is used to calculate the % total output accuracy. where v out actual = v sense x gain example: gain = 100, for 100mv v sense input we measure 10.1v. the overall accuracy (v oa ) is 1% as shown in equation 3. power dissipation it is possible to exceed the +150c maximum junction temperatures under certain load and power supply conditions. it is therefore important to ca lculate the maximum junction temperature (t jmax ) for all applications to determine if power supply voltages, load conditions , or package type need to be modified to remain in the safe operating area. these parameters are related using equation 4: where: ?p dmaxtotal is the sum of the maximum power dissipation of each amplifier in the package (pd max ) ?pd max for each amplifier can be calculated using equation 5: where: ?t max = maximum ambient temperature ? ja = thermal resistance of the package ?pd max = maximum power dissipation of 1 amplifier ?v cc = total supply voltage ?i qmax = maximum quiescent suppl y current of 1 amplifier ?v outmax = maximum output voltage swing of the application ?r l = load resistance figure 22. typical application circuit gm hi gm lo 1.35v + - out v cc i = 2.86a gnd r s r s- r p (1m ? to 0.1 ? ) 0.1vdc to 28vdc + - c d load c m 2.7vdc to 28vdc r s+ v oa 100 v out actual v out ected exp ? v out ected exp ----------------------------------------------------------------------------- - ?? ?? ?? = (eq. 2) (eq. 3) v oa 100 10.1 10 ? 10 ------------------------ - ?? ?? 1percent == t jmax t max ja xpd maxtotal + = (eq. 4) pd max v s i qmax v s ( - v outmax ) v outmax r l ------------------------ + = (eq. 5) isl28005 13 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn6973.4 july 1, 2011 for additional products, see www.intersil.com/product_tree products intersil corporation is a leader in the design and manufacture of high-performance analog semico nductors. the company's product s address some of the industry's fastest growing markets, such as , flat panel displays, cell phones, handheld products, and noteb ooks. intersil's product families address power management and analog signal processi ng functions. go to www.intersil.com/products for a complete list of intersil product families. *for a complete listing of applications, related documentation an d related parts, please see the respective device information page on intersil.com: isl28005 to report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff fits are available from our website at http://rel.intersil.com/reports/search.php revision history the revision history provided is for informational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest rev. date revision change 4/11/11 fn6973.4 corrected location of the load in figure 19. moved load from the ground side of the input sense circuit to the h igh side of the voltage source updated note in min max column of spec table from "parameters with min and/or max limits are 100% tested at +25c, unless otherwise specified. temperature limits established by characte rization and are not production tested." to "compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design." 9/2/10 fn6973.3 added -t7a tape and reel package option s to ordering information table for all packages. 5/12/10 fn6973.2 added note 4 to part marking column in ?ordering information? on page 3. corrected hyperlinks in notes 1 and 3 in ?ordering information? on page 3. corrected isl28005 hyperlink in ?products? on page 13. 4/12/10 added eval boards to ordering info. 4/7/10 added ?related literature? on page 1 updated package drawing number in the ?ordering information? on page 3 from mdp0038 to p50.64a. revised package outline drawing from mdp0038 to p5.064a on page 14. mdp0038 package contained 2 packages for both the 5 and 6 ld sot-23. mdp0038 was obsoleted and the packages were separated and made into 2 separate package outline drawings; p5.064a and p6.064a. changes to the 5 ld sot-23 were to move dimensions from table onto drawing, add land pattern and add jedec reference number. 2/3/10 fn6973.1 -page1: edited last sentence of paragraph 2. moved order of gain listings from 20, 50, 100 to 100, 50, 20 in the 3rd paragraph. under features ....removed "low input offset voltage 250v,max" under features .... moved order of parts listing from 20, 50, 100 (from top to bottom) to 100, 50, 20. -page 3: removed coming soon on isl28005fh50z and isl28005fh20z and changes the order or listing them to 100, 50, 20. -page 5: voa test. under conditions column ...deleted ?20mv to?. it now reads ... vsense = 100mv sr test. under conditions column ..deleted what was there. it now reads ... pulse on rs+pin, see figure 17 -page 6: ts test. removed gain = 100 and gain = 100v/v in bo th description and conditions columns respectively. -page 9 added figure 17 and adjusted figure numbers to account for the added figure. 12/14/09 fn6973.0 initial release isl28005 14 fn6973.4 july 1, 2011 package outline drawing p5.064a 5 lead small outline transistor plastic package rev 0, 2/10 dimension is exclusive of mold flash, protrusions or gate burrs. this dimension is measured at datum ?h?. package conforms to jedec mo-178aa. foot length is measured at reference to guage plane. dimensions in ( ) for reference only. dimensioning and tolerancing conform to asme y14.5m-1994. 6. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: detail "x" side view typical recommended land pattern top view index area pin 1 seating plane gauge 0.450.1 (2 plcs) 10 typ 4 1.90 0.40 0.05 2.90 0.95 1.60 2.80 0.05-0.15 1.14 0.15 0.20 c a-b d m (1.20) (0.60) (0.95) (2.40) 0.10 c 0.08-0.20 see detail x 1.45 max (0.60) 0-3 c b a d 3 3 3 0.20 c (1.90) 2x 0.15 c 2x d 0.15 c 2x a-b (0.25) h 5 2 4 5 5 end view plane |
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