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september 2010 doc id 17857 rev 1 1/12 12 tsc1021 high-side current sense amplifier features wide common-mode operating range independent of supply: 2.8 to 30 v wide common-mode surviving range: -32 to 60 v (reversed battery and load-dump conditions) maximum input offset voltage: ? 1.5 mv for t amb = 25c ? 2.3 mv for -40 c < t amb < 125 c maximum total output voltage error: ? 1.5% for t amb = 25c ? 2.5% for -40c < t amb < 125c maximum variation over temperature: ?dv os /dt = 8 v/c ?dv out /dt = 100 ppm/c low current consumption: i cc max = 300 a -40 to 125c operating temperature range internally fixed gain: 20 v/v, 50 v/v emi filtering applications automotive current monitoring notebook computers server power supplies telecom equipment industrial smps current sharing led current measurement description the tsc1021 measures a small differential voltage on a high-side shunt resistor and translates it into a ground-referenced output voltage. the tsc1021 has been specifically designed to deal with automotive conditions: load-dump protection up to 60 v, reverse-battery protection up to -32 v, esd protection up to 4 kv and internal filtering for emi performance. input common-mode and power supply voltages are independent: the common-mode voltage can range from 2.8 to 30 v in operating conditions and up to 60 v in absolute maximum ratings while the tsc1021 can be supplied by a 5 v independent supply line. the tsc1021 is housed in a tiny tssop8 package and integrates a buffer that provides low impedance output to ease interfacing and avoid accuracy losses. the overall device current consumption is lower than 300 a. tssop8 (plastic package) www.st.com
application diagram tsc1021 2/12 doc id 17857 rev 1 1 application diagram the tsc1021 high-side current-sense amplifier features a 2.8 to 30 v input common-mode range that is independent of the supply voltage. the main advantage of this feature is that it allows high-side current sensing at voltages much greater than the supply voltage (v cc ). figure 1. application schematic: high-line current sensing su pply volt a ge v s en s e o u t gnd vcc ilo a d common-mode r a nge rg1 rg2 rg 3 r s en s e vm vp v o u t = av.v s en s e am061 3 5
tsc1021 pin configuration doc id 17857 rev 1 3/12 2 pin configuration figure 2. pin connections (top view) ta bl e 1 describes the function of ea ch pin. their position is sh own in the illustration on the cover page and in figure 1 above. a1 table 1. pin description pin number symbol type function 1v m analog input connection for the external sense resistor. the measured current exits the shunt on the v m side. 3 gnd power supply ground line 4 out analog output buffered output of the current sensing amplifier 6v cc power supply positive power supply line 8v p analog input connection for the external sense resistor. the measured current enters the shunt on the v p side. 2 1 3 gnd vm nc 6 8 vcc vp 4 o u t 7 nc 5 nc
absolute maximum ratings and operating conditions tsc1021 4/12 doc id 17857 rev 1 3 absolute maximum ratings and operating conditions table 2. absolute maximum ratings symbol parameter value unit v id input pins differential voltage (v p -v m )20v v i current sensing input pin voltages (v p and v m ) (1) 1. voltage values are measured with respect to the gnd pin. -32 to 60 v v 1 voltage for vcc, out pins (1) -0.3 to 7 v t stg storage temperature -65 to 150 c t j maximum junction temperature 150 c r thja tssop8 thermal resistance junction to ambient 120 c/w esd hbm: human body model for v p and v m pins (2) 4kv hbm: human body model (2) 2. human body model: a 100 pf capacit or is charged to the specified voltage, then discharged through a 1.5k resistor between two pins of the device. this is done for all couples of connected pin combinations while the other pins are floating. 2kv mm: machine model (3) 3. machine model: a 200 pf capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (int ernal resistor < 5 ). this is done for all couples of connected pin combinations whil e the other pins are floating. 250 v cdm: charged device model (4) 4. charged device model: all pins and package are ch arged together to the specified voltage and then discharged directly to ground. 1.5 kv table 3. operating conditions symbol parameter value unit v cc dc supply voltage from t min to t max 3.5 to 5.5 v t oper operational temperature range (t min to t max ) -40 to 125 c v icm common mode voltage range (v m and v p pins voltages) 2.8 to 30 v
tsc1021 electrical characteristics doc id 17857 rev 1 5/12 4 electrical characteristics the electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: t amb = 25c, v cc = 5 v, v sense = v p -v m = 50 mv, v m = 12 v, no load on out, all gain configurations. table 4. supply symbol parameter test conditions min. typ. max. unit i cc total supply current v sense = 0 v -40 c < t amb < 125 c 300 a i cc1 total supply current v sense = 50 mv -40 c < t amb < 125 c 450 a table 5. electrical performances symbol parameter test conditions min. typ. max. unit dc cmr dc common-mode rejection variation of v out versus v m referred to input (1) 2.8 v< v m < 30 v -40 c < t amb < 125 c 90 105 db ac cmr ac common mode rejection variation of v out versus v m referred to input (peak-to-peak voltage variation) 2.8 v< v m < 30 v dc to 1 khz sine wave 75 db svr supply voltage rejection variation of v out versus v cc (1) 3.5 v< v cc < 5.5 v -40 c< t amb < 125 c 80 95 db v os input offset voltage (1) 2.8 v< v m < 30 v t amb = 25 c -40 c < t amb < 125 c 1.5 2.3 mv dv os /dt input offset drift vs. t -40 c< t amb < 125 c 8 v/c dv out /dt output voltage drift vs. t -40 c< t amb < 125 c 100 ppm/c i lk input leakage current v cc = 0 v -40 c < t amb < 125 c 1a i ib input bias current v sense = 0 v -40 c < t amb < 125 c 7a av gain (variation of v out versus v sense ) tsc1021a tsc1021b 20 50 v/v v out total output voltage accuracy (2) v sense = 50 mv t amb = 25 c t min < t amb < t max 1.5 2.5 % v out total output voltage accuracy (2) v sense = 100 mv t amb = 25 c t min < t amb < t max 1.5 2.5 % v out total output voltage accuracy (2) v sense = 20 mv t amb = 25 c t min < t amb < t max 7 9 %
electrical characteristics tsc1021 6/12 doc id 17857 rev 1 v out total output voltage accuracy (2) v sense = 10 mv t amb = 25 c t min < t amb < t max 12 15 % v out / i out output stage load regulation -5 ma < i out <5 ma i out sink or source current 0.4 2 mv/ma v oh out high level saturation voltage v oh =v cc -v out v sense = 1 v, i out = 1 ma t amb = 25 c -40 c< t amb < 125 c 90 135 185 mv v ol out low level saturation voltage v sense = -1 v, i out = 1 ma t amb = 25 c -40 c< t amb < 125 c 80 125 165 mv 1. see chapter 5: parameter definitions . 2. output voltage accuracy is the difference with the expected theoretical output voltage v out-th = av x v sense . see chapter 5: parameter definitions for a more detailed definition. table 5. electrical performances symbol parameter test conditions min. typ. max. unit table 6. dynamic performances symbol parameter test conditions min. typ. max. unit ts v out settling to 1% final value v sense = 10 mv to 100 mv, c load = 47 pf 7s sr slew rate v sense = 10 mv to 100 mv 0.3 0.45 v/s bw 3 db bandwidth c load = 47 pf 800 khz e n equivalent input noise voltage f = 1 khz 50 nv/ hz
tsc1021 parameter definitions doc id 17857 rev 1 7/12 5 parameter definitions 5.1 common mode rejection ratio (cmr) the common-mode rejection ratio (cmr) meas ures the ability of the current-sensing amplifier to reject any dc voltage applied on both inputs v p and v m . the cmr is referred back to the input so that its effect can be compared with the applied differential signal. the cmr is defined by the formula: 5.2 supply voltage rejection ratio (svr) the supply-voltage rejection ratio (svr) me asures the ability of the current-sensing amplifier to reject any variat ion of the supply voltage v cc . the svr is referred back to the input so that its effect can be compared with the applied differential signal. the svr is defined by the formula: 5.3 gain (av) and input offset voltage (v os ) the input offset voltage is defined as the intersection between the linear regression of the v out vs. the v sense curve with the x-axis. if v out1 is the output voltage with v sense = v sense1 = 50 mv and v out2 is the output voltage with v sense = v sense2 = 5 mv, then v os can be calculated with the following formula. 5.4 output voltage drift versus temperature the output voltage drift versus temperature is defined as the maximum variation of v out with respect to its value at 25c, over the temperature range. it is calculated as follows: with t min < t amb < t max . cmr 20 ? v out v icm av ? ------------------------------ log ? = svr 20 ? v out v cc av ? --------------------------- log ? = v os v sense1 v sense1 v sense2 ? v out1 v out2 ? ----------------------------------------------- - v out1 ? ?? ?? ? = v out t ---------------- -max v out tamb () v out 25 c () ? tamb 25 c ? ------------------------------------------------------------------------- - =
parameter definitions tsc1021 8/12 doc id 17857 rev 1 5.5 output voltage accuracy the output voltage accuracy is the difference between the actual output voltage and the theoretical output voltage. ideally, the current sensing output voltage should be equal to the input differential voltage multiplied by the theoretical gain, as in the following formula. the actual value is very slightly different, mainly due to the effects of: the input offset voltage v os , the non-linearity, the voltage saturation of v ol and v oh . the output voltage accuracy, expressed as a percentage, can be calculated with the following formula. with av = 20 v/v for tsc1021a and av = 50 v/v for tsc1021b. v out-th av v sense ? = v out abs v out av v sense ? () ? () av v sense ? -------------------------------------------------------------------------- - =
tsc1021 package information doc id 17857 rev 1 9/12 6 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 3. tssop8 package mechanical drawing table 7. tssop8 package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a1.200.047 a1 0.05 0.15 0.002 0.006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.008 d 2.90 3.00 3.10 0.114 0.118 0.122 e 6.20 6.40 6.60 0.244 0.252 0.260 e1 4.30 4.40 4.50 0.169 0.173 0.177 e 0.65 0.0256 k0 80 8 l 0.45 0.60 0.75 0.018 0.024 0.030 l1 1 0.039 aaa 0.10 0.004
ordering information tsc1021 10/12 doc id 17857 rev 1 7 ordering information table 8. order codes part number temperature range package packaging marking gain tsc1021aipt -40c, +125c tssop8 tape & reel o21ai 20 tsc1021bipt o21bi 50 TSC1021AIYPT -40c, +125c automotive grad e (1) 1. qualification and characterizati on according to aec q100 and q003 or equivalent, advanced screening according to aec q001 & q 002 or equivalent are ongoing. o21ay 20 tsc1021biypt o21by 50
tsc1021 revision history doc id 17857 rev 1 11/12 8 revision history table 9. document revision history date revision changes 23-sep-2010 1 initial release.
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