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this is information on a product in full production. march 2014 docid026040 rev 1 1/18 CS30 high side current sens e high voltage op amp datasheet - production data features ? independent supply and input common-mode voltages ? wide common-mode operating range: 2.8 to 30 v ? wide common-mode surviving range: - 0.3 to 60 v (load-dump) ? wide supply voltage range: 4 to 24 v ? low current consumption: i cc max = 300 a ? internally fixed gain: 20 v/v, 50 v/v or 100 v/v ? buffered output applications ? wireless battery chargers ? chargers for portable equipment ? precision current sources ? wearable description the CS30 measures a small differential voltage on a high-side shunt resistor and translates it into a ground referenced output voltage. the gain is internally fixed. wide input common-mode voltage range, low quiescent current, and tiny sot23 packaging enable use in a wide variety of applications. the 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 rating conditions. the current consumption below 300 a and the wide supply voltage range enable the power supply to be connected to either side of the current measurement shunt with minimal error. 2 1 3 v p ou t gnd 4 5 vm vcc sot23-5l (plastic package) pin connection (top view) table 1. device summary part number temperature range package packaging marking gain CS30al -40c to +125c sot23-5l tape & reel o104 20 CS30bl o105 50 CS30cl o106 100 www.st.com
contents CS30 2/18 docid026040 rev 1 contents 1 application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings and operating c onditions . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 common mode rejection ratio (cmr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 supply voltage rejection ratio (svr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 gain (av) and input offset voltage (v os ) . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.5 output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
docid026040 rev 1 3/18 CS30 application schematic and pin description 18 1 application schematic and pin description the CS30 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 table 2 describes the function of ea ch pin. the pin positions are shown in the illustration on the cover page and in figure 1 above. table 2. pin description symbol type function out analog output output voltage, proportional to the magnitude of the sense voltage v p -v m . gnd power supply ground line v cc power supply positive power supply line v p analog input connection for the external sense resistor. the measured current enters the shunt on the v p side. v m analog input connection for the external sense resistor. the measured current exits the shunt on the v m side. 9 vhqvh 9rxw $y[9vhqvh 9 s 9 p 2xw *qg 9 && ordg , ordg wr9 5j 5j 5j 5 vhqvh wr9 $0
absolute maximum ratings and operating conditions CS30 4/18 docid026040 rev 1 2 absolute maximum ratings and operating conditions table 3. absolute maximum ratings symbol parameter value unit v id input pins differential voltage (v p -v m )60v v i input pin voltages (v p and v m ) (1) 1. voltage values are measured with respect to the ground pin. -0.3 to 60 v v cc dc supply voltage (1) -0.3 to 25 v v out dc output pin voltage (1) -0.3 to v cc v t stg storage temperature -55 to 150 c t j maximum junction temperature 150 c r thja sot23-5 thermal resistance junction to ambient 250 c / esd hbm: human body model (2) 2. human body model: a 100 pf capacitor 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. 2.5 kv 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 (internal resistor < 5 ). this is done for all couples of connected pin combinations whil e the other pins are floating. 150 v cdm: charged device model (4) 4. charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to the ground. 1.5 kv table 4. operating conditions symbol parameter value unit v cc dc supply voltage from t min to t max 4.0 to 24 v t oper operational temperature range (t min to t max ) -40 to 125 c v icm common mode voltage range 2.8 to 30 v
docid026040 rev 1 5/18 CS30 electrical characteristics 18 3 electrical characteristics table 5. supply (1) symbol parameter test conditions min. typ. max. unit i cc total supply current v sense =0v t min < t amb < t max 165 300 a 1. unless otherwise specified, the test conditions are t amb = 25c, v cc =12v, v sense =v p -v m =50mv, v m = 12 v, no load on out. table 6. input (1) symbol parameter test conditions min. typ. max. unit cmr common mode rejection variation of v out versus v icm referred to input (2) 2.8 v < v icm < 30 v t min < t amb < t max 90 105 db svr supply voltage rejection variation of v out versus v cc (3) 4.0 v < v cc < 24 v v sense =30mv t min < t amb < t max 90 105 db v os input offset voltage (4) t amb = 25 c t min < t amb < t max 0.2 0.9 1.5 2.3 mv dv os /dt input offset drift vs. t t min < t amb < t max -3 v/c i lk input leakage current v cc = 0 v t min < t amb < t max 1a i ib input bias current v sense = 0 v t min < t amb < t max 5.5 8 a 1. unless otherwise specified, the test conditions are t amb = 25c, v cc =12v, v sense =v p -v m =50mv, v m = 12 v, no load on out. 2. see section 4.1: common mode rejection ratio (cmr) on page 12 for the definition of cmr. 3. see section 4.2: supply voltage rejection ratio (svr) on page 12 for the definition of svr. 4. see section 4.3: gain (av) and input offset voltage (v os ) on page 12 for the definition of v os .
electrical characteristics CS30 6/18 docid026040 rev 1 table 7. output (1) symbol parameter test conditions min. typ. max. unit av gain CS30a CS30b CS30c 20 50 100 v/v av gain accuracy t amb = 25c t min < t amb < t max 2.5 4.5 % v out / t output voltage drift vs. t (2) t min < t amb < t max 0.4 mv/c v out / i out output stage load regulation -10 ma < i out <10 ma i out sink or source current 34mv/ma v out total output voltage accuracy (3) v sense = 50 mv t amb = 25 c t min < t amb < t max 2.5 4.5 % v out total output voltage accuracy v sense = 100 mv t amb = 25 c t min < t amb < t max 3.5 5 % v out total output voltage accuracy v sense = 20 mv t amb = 25 c t min < t amb < t max 8 11 % v out total output voltage accuracy v sense = 10 mv t amb = 25 c t min < t amb < t max 15 20 % i sc-sink short-circuit sink current out connected to v cc, v sense = -1 v 30 60 ma i sc-source short-circuit source current out connected to gnd v sense = 1 v 15 26 ma v oh output stage high-state saturation voltage v oh =v cc -v out v sense = 1 v i out = 1 ma 0.8 1 v v ol output stage low-state saturation voltage v sense = -1 v i out = 1 ma 50 100 mv 1. unless otherwise specified, the test conditions are t amb = 25c, v cc = 12 v, v sense = v p -v m = 50 mv, v m = 12 v, no load on out. 2. see output voltage drift versus temperature on page 13 for the definition. 3. output voltage accuracy is the difference with the expected theoretical output voltage v out-th = av*v sense . see output voltage accuracy on page 14 for a more detailed definition.
docid026040 rev 1 7/18 CS30 electrical characteristics 18 table 8. frequency response (1) symbol parameter test cond itions min. typ. max. unit ts output settling to 1% final value v sense = 10 mv to 100 mv c load = 47 pf (2) CS30a CS30b CS30c 3 6 10 s sr slew rate v sense = 10 mv to 100 mv 0.55 0.9 v/s bw 3db bandwidth c load = 47 pf (2) v sense = 100 mv CS30a CS30b CS30c 500 670 450 khz 1. unless otherwise specified, the test conditions are t amb = 25c, v cc = 12 v, v sense = v p -v m = 50 mv, v m = 12 v, no load on out. 2. for stability purposes, we do not recommend using a greater value of load capacitor. table 9. noise (1) symbol parameter test conditions min. typ. max. unit total output voltage noise 50 nv/ hz 1. unless otherwise specified, the test conditions are t amb = 25c, v cc = 12 v, v sense = v p -v m = 50 mv, v m = 12 v, no load on out.
electrical characteristics CS30 8/18 docid026040 rev 1 3.1 electrical char acteristics curves for the following curves, the tested device is a CS30c, and the test conditions are t amb =25c, v cc = 12 v, v sense = v p -v m = 50 mv, v m = 12 v, no load on out unless otherwise specified. figure 2. supply current vs. supply voltage (v sense = 0 v) figure 3. supply current vs. v sense figure 4. v p pin input bias current vs. v sense figure 5. v m pin input bias current vs. v sense
docid026040 rev 1 9/18 CS30 electrical characteristics 18 figure 6. minimum co mmon mode operating voltage vs. temperature figure 7. output stage low-state saturation voltage versus output current (v sense =-1 v) figure 8. output stage high-state saturation voltage versus output current (v sense =+1v) figure 9. output short-circuit source current versus temperature (out pin connected to ground) figure 10. output short-circuit sink current versus temperature (out pin connected to v cc ) figure 11. output stage load regulation
electrical characteristics CS30 10/18 docid026040 rev 1 figure 12. input offset drift versus temperature figure 13. output voltage drift versus temperature figure 14. bode diagram (v sense =100mv) figure 15. power-supply rejection ratio versus frequency CS30c CS30b CS30a figure 16. total output voltage accuracy versus v sense figure 17. output voltage versus v sense CS30a CS30b CS30c
docid026040 rev 1 11/18 CS30 electrical characteristics 18 figure 18. output voltage versus v sense (detail for low v sense values) figure 19. step response CS30a CS30b CS30c CS30a CS30b CS30c
parameter definitions CS30 12/18 docid026040 rev 1 4 parameter definitions 4.1 common mode rejection ratio (cmr) the common-mode rejection ra tio (cmr) measures 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: 4.2 supply voltage re jection ratio (svr) the supply-voltage rejection ratio (svr) measures the ab ility 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: 4.3 gain (av) and input offset voltage (v os ) the input offset voltage is defined as the inte rsection between the linear regression of the v out versus v sense curve with the x-axis (see figure 20 ). if v out1 is the output voltage with v sense =v sense1 =50mv and v out2 is the output voltage with v sense =v sense2 =5mv, then v os can be calculated with the following formula: the amplification gain a v is defined as the ratio between ou tput voltage and input differential voltage: 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 ? ?? ?? ? = av v out v sense ----------------- - =
docid026040 rev 1 13/18 CS30 parameter definitions 18 figure 20. v out versus v sense characteristics: detail for low v sense values 4.4 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 . figure 21 provides a graphical definition of output voltage drift versus temperature. on this chart, v out is always comprised in the area defined by dotted lines representing the maximum and minimum variation of v out versus t. figure 21. output voltage drift versus temperature 9rv p9 9vhqvh p9 9rxw 9rxw $0 9rxw v out t ---------------- -max v out t amb () v out 25 c () ? t amb 25 c ? ------------------------------------------------------------------------- =
parameter definitions CS30 14/18 docid026040 rev 1 4.5 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: v out-th =a v v sense the actual value is very slightly different, mainly due to the effects of: ? the input offset voltage v os , ? non-linearity figure 22. v out vs. v sense theoretical and actual characteristics the output voltage accuracy, expressed in perc entage, can be calculated with the following formula: with a v = 20 v/v for CS30a, a v = 50 v/v for CS30b and a v = 100 v/v for CS30c. 9vhqvh p9 ,ghdo $fwxdo 9rxw 9rxwdffxudf\iru9 vhqvh p9 $0 v out abs v out a v v sense ? () ? () a v v sense ? ---------------------------------------------------------------------- - =
docid026040 rev 1 15/18 CS30 application information 18 5 application information the CS30 can be used to measure current and to feed back the information to a microcontroller, as shown in figure 23 . figure 23. typical application schematic the current from the supply flows to the load through the r sense resistor causing a voltage drop equal to v sense across r sense . the amplifier input currents are negligible, therefore its inverting input voltage is equal to v m . the amplifier's open-loop gain forces its non-inverting input to the same voltage as the inverting input. as a consequence, the amplifier adjusts current flowing through rg1 so that the voltage drop across rg1 exactly matches v sense . therefore, the drop across rg1 is: v rg1 =v sense =r sense .i load if i rg1 is the current flowing through rg1, then i rg1 is given by the formula: i rg1 =v sense /rg1 the i rg1 current flows entirely into resistor r g3 (the input bias current of the buffer is negligible). therefore, the voltage drop on the r g3 resistor can be calculated as follows: v rg3 =r g3 .i rg1 =(r g3 /r g1 ).v sense because the voltage across the r g3 resistor is buffered to the out pin, v out can be expressed as: v out =(r g3 /r g1 ).v sense or v out =(r g3 /r g1) .r sense .i load the resistor ratio r g3 /r g1 is internally set to 20v/v for CS30a, to 50v/v for CS30b and to 100v/v for CS30c. the r sense resistor and the r g3 /r g1 resistor ratio (equal to a v ) are important parameters because they define the full scale output range of your application. therefore, they must be selected carefully. 5 v v sense v out load i load 2.8 v to 30 v r sense v reg v p v m out gnd v cc rg1 rg2 rg3 CS30 microcontroller adc gnd v cc am06163v1
package information CS30 16/18 docid026040 rev 1 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 a nd product status are available at: www.st.com . ecopack ? is an st trademark. figure 24. sot23-5l package mechanical drawing table 10. sot23-5l package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a 0.90 1.20 1.45 0.035 0.047 0.057 a1 0.15 0.006 a2 0.90 1.05 1.30 0.035 0.041 0.051 b 0.35 0.40 0.50 0.013 0.015 0.019 c 0.09 0.15 0.20 0.003 0.006 0.008 d 2.80 2.90 3.00 0.110 0.114 0.118 d1 1.90 0.075 e 0.95 0.037 e 2.60 2.80 3.00 0.102 0.110 0.118 f 1.50 1.60 1.75 0.059 0.063 0.069 l 0.10 0.35 0.60 0.004 0.013 0.023 k 0 degrees 10 degrees
docid026040 rev 1 17/18 CS30 revision history 18 7 revision history table 11. document revision history date revision changes 06-mar-2014 1 initial release
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