TSC1021 High-side current sense amplifier Datasheet - production data Related products See TSC103 for higher common-mode operating range (2.9 V to 70 V) Applications Automotive current monitoring Notebook computers Server power supplies Telecom equipment Industrial SMPS Current sharing LED current measurement Features Description Wide common-mode operating range The TSC1021 measures a small differential independent of supply: 2.8 V to 30 V voltage on a high-side shunt resistor and Wide common-mode survival range: -32 V to translates it into a ground-referenced output 60 V (reversed battery and load-dump voltage. conditions) Maximum input offset voltage: The TSC1021 has been specifically designed for automotive conditions: load-dump protection up ±1.5 mV for T = 25 °C amb to 60 V, reverse-battery protection up to -32 V, ±2.3 mV for -40 °C < T < 125 °C amb ESD protection up to 4 kV and internal filtering for Maximum total output voltage error: EMI performance. ±1.5 % for T = 25 °C amb ±2.5 % for -40 °C < T < 125 °C Input common-mode and power supply voltages amb Maximum variation over temperature: are independent: the common-mode voltage can dV /dT = 8 µV/°C range from 2.8 to 30 V in operating conditions os dV /dT = 100 ppm/°C and up to 60 V in absolute maximum ratings out while the TSC1021 can be supplied by a 5 V Low current consumption: I max = 300 µA CC independent supply line. -40 °C to 125 °C operating temperature range The TSC1021 is housed in a tiny TSSOP8 Internally fixed gain: 20 V/V, 50 V/V package and integrates a buffer that provides low EMI filtering impedance output to ease interfacing and avoid accuracy losses. The overall device current consumption is lower than 300 µA. November 2015 DocID017857 Rev 4 1/17 This is information on a product in full production. www.st.com

Contents TSC1021 Contents 1 Application diagram ........................................................................ 3 2 Pin configuration ............................................................................. 4 3 Absolute maximum ratings and operating conditions ................. 5 4 Electrical characteristics ................................................................ 6 5 Electrical characteristics curves: current sense amplifier ........... 8 6 Parameter definitions .................................................................... 11 6.1 Common mode rejection ratio (CMR) .............................................. 11 6.2 Supply voltage rejection ratio (SVR) ............................................... 11 6.3 Gain (Av) and input offset voltage (Vos) ......................................... 11 6.4 Output voltage drift versus temperature .......................................... 11 6.5 Output voltage accuracy ................................................................. 12 7 Package information ..................................................................... 13 7.1 TSSOP8 package information ......................................................... 14 8 Ordering information ..................................................................... 15 9 Revision history ............................................................................ 16 2/17 DocID017857 Rev 4

TSC1021 Application diagram 1 Application diagram The TSC1021 high-side current-sense amplifier features a 2.8 V 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 DocID017857 Rev 4 3/17

Pin configuration TSC1021 2 Pin configuration Figure 2: Pin connections (top view) Table 1: "Pin description" describes the function of each pin. Their position is shown in the illustration on the cover page and in Figure 2: "Pin connections (top view)" above. Table 1: Pin description Pin Symbol Type Function number Connection for the external sense resistor. The 1 V Analog input m measured current exits the shunt on the V side. m 3 Gnd Power supply Ground line 4 Out Analog output Buffered output of the current sensing amplifier 6 V Power supply Positive power supply line CC Connection for the external sense resistor. The 8 V Analog input p measured current enters the shunt on the V side. p 4/17 DocID017857 Rev 4

TSC1021 Absolute maximum ratings and operating conditions 3 Absolute maximum ratings and operating conditions Table 2: Absolute maximum ratings Symbol Parameter Value Unit V Input pins differential voltage (V -V ) ±20 id p m V Current sensing input pin voltages (V and V ) (1) -32 to 60 V i p m V Voltage for Vcc, Out pins (1) -0.3 to 7 1 T Storage temperature -65 to 150 stg °C T Maximum junction temperature 150 j R TSSOP8 thermal resistance junction to ambient 120 °C/Ω thja HBM: human body model for V and V pins (2) 4 p m kV HBM: human body model for all other pins (2) 2 ESD MM: machine model (3) 250 V CDM: charged device model (4) 1.5 kV Notes: (1)Voltage values are measured with respect to the GND pin. (2)Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. (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 Ω). This is done for all couples of connected pin combinations while the other pins are floating. (4)Charged device model: all pins and package are charged together to the specified voltage and then discharged directly to ground. Table 3: Operating conditions Symbol Parameter Value Unit V DC supply voltage from T to T 3.5 to 5.5 V CC min max T Operational temperature range (T to T ) -40 to 125 °C oper min max V Common-mode voltage range (V and V pin voltage) 2.8 to 30 V icm m p DocID017857 Rev 4 5/17

Electrical characteristics TSC1021 4 Electrical characteristics The electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: T = 25 °C, V = 5 V, V = V -V = 50 mV, amb CC sense p m V = 12 V, no load on Out, all gain configurations. m Table 4: Supply Symbol Parameter Test conditions Min. Typ. Max. Unit I Total supply current V = 0 V, -40 °C < T < 125 °C 300 CC sense amb — — µA I Total supply current V = 50 mV, -40 °C < T < 125 °C 450 CC1 sense amb Table 5: Electrical performances Symbol Parameter Test conditions Min. Typ. Max. Unit DC common-mode rejection, variation of V 2.8 V < V < 30 V, DC CMR out m 90 105 versus Vm referred to -40 °C < Tamb < 125 °C input (1) AC common mode rejection, variation of V out 2.8 V < V < 30 V, dB AC CMR versus V referred to input m 75 m DC to 1 kHz sine wave (peak-to-peak voltage variation) Supply voltage rejection, 3.5 V < V < 5.5 V, SVR variation of V versus CC 80 95 V (1) out -40 °C< Tamb < 125°C CC 2.8 V < V < 30 V, T = 25 °C ±1.5 m amb Vos Input offset voltage (1) 2.8 V < Vm < 30 V, ±2.3 mV -40 °C < Tamb < 125 °C dV /dT Input offset drift vs. T -40 °C< T < 125 °C 8 µV/°C os amb dV /dT Output voltage drift vs. T -40 °C< T < 125 °C 100 ppm/°C out amb I Input leakage current V = 0 V, -40 °C < T < 125 °C 1 lk CC amb µA I Input bias current V = 0 V, -40 °C < T < 125 °C 7 ib sense amb Gain, (variation of V TSC1021A 20 Av out V/V versus Vsense) TSC1021B 50 V = 50 mV, T = 25 °C ±1.5 sense amb V = 50 mV, T < T < T ±2.5 sense min amb max V = 100 mV, T = 25 °C ±1.5 sense amb Total output voltage Vsense = 100 mV, Tmin < Tamb < Tmax ±2.5 ΔV % out accuracy (2) V = 20 mV, T = 25 °C ±7 sense amb V = 20 mV, T < T < T ±9 sense min amb max V = 10 mV, T = 25 °C ±12 sense amb V = 10 mV, T < T < T ±15 sense min amb max Output stage load -5 mA < I <5 mA, ΔV /ΔI out ±0.4 ±2 mV/mA out out regulation Iout sink or source current 6/17 DocID017857 Rev 4

TSC1021 Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit V = 1 V, I = 1 mA, sense out 90 135 Out high level saturation Tamb = 25 °C V oh voltage, Voh=Vcc-Vout Vsense = 1 V, Iout = 1 mA, 185 -40 °C< Tamb < 125 °C mV V = -1 V, I = 1 mA, sense out 80 125 Out low level saturation Tamb = 25 °C V ol voltage V = -1 V, I = 1 mA, sense out 165 -40 °C< Tamb < 125 °C Notes: (1)See Section 6: "Parameter definitions". (2)Output voltage accuracy is the difference with the expected theoretical output voltage Vout-th = Av x Vsense. See Section 6: "Parameter definitions" for a more detailed definition. Table 6: Dynamic performances Symbol Parameter Test conditions Min. Typ. Max. Unit V = 10 mV to 100 mV, ts V settling to 1 % final value sense 7 µs out Cload = 47 pF SR Slew rate V = 10 mV to 100 mV 0.3 0.45 V/µs sense BW 3 dB bandwidth C = 47 pF 800 kHz load e Equivalent input noise voltage f = 1 kHz 50 nV/√ Hz N DocID017857 Rev 4 7/17

Electrical characteristics curves: current sense TSC1021 amplifier 5 Electrical characteristics curves: current sense amplifier Unless otherwise specified, the test conditions for the following curves are: Tamb = 25 °C, V = 5 V, Vsense = Vp - Vm = 50 mV, Vm = 12 V. CC No load on the Out pin. Figure 3: Output voltage vs. Vsense Figure 4: Output voltage accuracy vs. Vsense Figure 5: Supply current vs. supply voltage Figure 6: Supply current vs. Vsense Figure 7: Vp pin input current vs. Vsense Figure 8: Vn pin input current vs. Vsense 8/17 DocID017857 Rev 4

TSC1021 Electrical characteristics curves: current sense amplifier Figure 9: Output stage low-state saturation voltage vs. Figure 10: Output stage high-state saturation voltage vs. output current (Vsense = -1 V) output current (Vsense = 1 V) Figure 11: Output stage load regulation Figure 12: Step response Figure 13: Bode diagram Figure 14: Power supply rejection ratio DocID017857 Rev 4 9/17

Electrical characteristics curves: current sense TSC1021 amplifier Figure 15: Noise level 10/17 DocID017857 Rev 4

TSC1021 Parameter definitions 6 Parameter definitions 6.1 Common mode rejection ratio (CMR) The common-mode rejection ratio (CMR) measures the ability of the current-sensing amplifier to reject any DC voltage applied on both inputs V and V . The CMR is referred p m back to the input so that its effect can be compared with the applied differential signal. The CMR is defined by the formula: 6.2 Supply voltage rejection ratio (SVR) The supply-voltage rejection ratio (SVR) measures the ability of the current-sensing amplifier to reject any variation of the supply voltage V . The SVR is referred back to the CC input so that its effect can be compared with the applied differential signal. The SVR is defined by the formula: 6.3 Gain (Av) and input offset voltage (Vos) The input offset voltage is defined as the intersection between the linear regression of the V vs. the V curve with the X-axis. If V is the output voltage with V = V = 50 out sense out1 sense sense1 mV, and V is the output voltage with V = V = 5 mV, then V can be calculated out2 sense sense2 os with the following formula. 6.4 Output voltage drift versus temperature The output voltage drift versus temperature is defined as the maximum variation of V with out respect to its value at 25 °C, over the temperature range. It is calculated as follows: with T < T < T . min amb max DocID017857 Rev 4 11/17

Parameter definitions TSC1021 6.5 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 and V OL 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. 12/17 DocID017857 Rev 4

TSC1021 Package information 7 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. DocID017857 Rev 4 13/17

Package information TSC1021 7.1 TSSOP8 package information Figure 16: TSSOP8 package outline Table 7: TSSOP8 mechanical data Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A 1.2 0.047 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 k 0° 8° 0° 8° L 0.45 0.60 0.75 0.018 0.024 0.030 L1 1 0.039 aaa 0.1 0.004 14/17 DocID017857 Rev 4

TSC1021 Ordering information 8 Ordering information Table 8: Order codes Part number Temperature range Package Packaging Marking Gain TSC1021AIPT O21AI 20 -40 °C to 125 °C TSC1021BIPT O21BI 50 TSSOP8 Tape and reel TSC1021AIYPT -40 °C to 125 °C O21AY 20 TSC1021BIYPT automotive grade (1) O21BY 50 Notes: (1)Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q002 or equivalent. DocID017857 Rev 4 15/17

Revision history TSC1021 9 Revision history Table 9: Document revision history Date Revision Changes 23-Sep-2010 1 Initial release Added Section 5: "Electrical characteristics curves: current 26-Feb-2014 2 sense amplifier". Updated footnote 1 of Table 8: "Order codes" Added Related products Replaced Figure 2: Pin connections (top view) 18-Aug-2014 3 Table 5: Electrical performances: corrected several erroneous symbols. Table 8: Order codes: updated “Marking”, updated footnote 1 Table 2: "Absolute maximum ratings": updated second "HBM" parameter. 06-Nov-2015 4 Table 5: "Electrical performances": updated unit of V os parameter from µV to mV. Table 7: "TSSOP8 mechanical data": updated parameter "aaa" 16/17 DocID017857 Rev 4

TSC1021 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2015 STMicroelectronics – All rights reserved DocID017857 Rev 4 17/17