A Product Line of Diodes Incorporated ZXCT1008Q Q AUTOMOTIVE GRADE 20V HIGH-SIDE CURRENT MONITOR Description Pin Assignments The ZXCT1008Q is a high side current sense monitor. Using this device eliminates the need to disrupt the ground plane when sensing a load current. SOT23 It takes a high side voltage developed across a current shunt resistor and translates it into a proportional output current. A user defined output resistor scales the output current into a ground-referenced voltage. The wide input voltage range of 20V down to as low as 2.5V makes it suitable for a range of applications. The ability to withstand high voltage transients and reverse polarity connection makes this part very suitable for automotive and other transient rich environment. The ZXCT1008Q has been qualified to AEC-Q100 Grade 1 and is Automotive Grade supporting PPAPs. Features Application Circuit Low Cost, Accurate High-Side Current Sensing -40 to +125°C Temperature Range Up to 500mV Sense Voltage 2.5V to 20V Supply Range 4μA Quiescent Current 1% Typical Accuracy SOT23 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Automotive Grade Qualified to AEC-Q100 Standards for High Reliability PPAP Capable (Note 4) Applications Automotive Current Measurement Automotive DC Motor Stall Detection Over Current Monitor Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green‖ products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. 4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the same, except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/. ZXCT1008Q Document number: DS36890 Rev. 2 - 2 1 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Pin Descriptions Pin Name Pin Function VSENSE+ Connection to Supply Voltage VSENSE- Connection to Load Output Current, Proportional to Measured Current IOUT Functional Block Diagram Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified. Note 5) Description Rating Voltage on Any Pin (Relative to IOUT) Continous Output Current, IOUT Continuous Sense Voltage, VSENSE (Note 6) Operating Temperature, TA Storage Temperature Unit -0.6 to 20 V 25 mA -0.5 to 5 V -40 to +125 °C -55 to +125 °C Package Power Dissipation @ TA = +25°C (Derate to Zero @ +125°C) 360 mW ESD Susceptibility HBM Human Body Model MM Machine Model CDM Charged Device Model 2 300 1 kV V kV Notes: 5. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. 6. VSENSE is defined as the differential voltage between VSENSE+ and VSENSE- pins. VSENSE = VSENSE+ - VSENSE= VIN - VLOAD = ILOAD x RSENSE ZXCT1008Q Document number: DS36890 Rev. 2 - 2 2 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Electrical Characteristics (@TA = +25°C, VIN = 5V, ROUT = 100Ω, unless otherwise specified.) Symbol Conditions (Note 6) Parameter Min Typ Max Unit 2.5 — 20 V 1 90 0.975 1.95 4.8 4 104 1.0 2.0 5.0 15 120 1.025 2.05 5.2 µA µA mA mA mA VCC Range — Output Current (Note 7) VSENSE = 0V VSENSE = 10mV VSENSE = 100mV VSENSE = 200mV VSENSE = 500mV VSENSE Sense Voltage (Note 6) — 0 — 500 mV ISENSE- VSENSE- Input Current — — — 100 nA ACC Accuracy RSENSE = 0.1Ω VSENSE = 200mV -2.5 — +2.5 % GM Transconductance, IOUT/VSENSE — — 10000 — µA/V BW Bandwidth VSENSE(DC) = 10mv, RF PIN = -40dBm (Note 8) — — 300 2 — — kHz MHz VIN IOUT Notes: VSENSE(DC) = 100mv, RF PIN = -20dBm 6. VSENSE is defined as the differential voltage between VSENSE+ and VSENSE- pins. VSENSE = VSENSE+ - VSENSE= VIN - VLOAD = ILOAD x RSENSE 7. Includes input offset voltage contribution. 8. -20dBm = 63mVPP into 50Ω. Power Dissipation The maximum allowable power dissipation of the device for normal operation (PMAX), is a function of the package junction to ambient thermal resistance (θJA), maximum junction temperature (TJMAX), and ambient temperature (TAMB), according to the expression: PMAX = (TJMAX – TAMB) / θJA The device power dissipation, PD is given by the expression: PD = IOUT x (VIN -VOUT) W ZXCT1008Q Document number: DS36890 Rev. 2 - 2 3 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Typical Characteristics ZXCT1008Q Document number: DS36890 Rev. 2 - 2 4 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Typical Characteristics (cont.) Application Information The following text describes how to scale a load current to an output voltage. VSENSE = VIN - VLOAD = RSENSE x ILOAD (1) IOUT = VSENSE x 10mA/V (2) VOUT = IOUT x ROUT (3) Combining (2) and (3) VOUT can be determined to be: VOUT = 0.01 x VSENSE x ROUT (4) Example: A 1A current is to be represented by a 1V output voltage: 1) Choose the value of RSENSE to give 50mV > VSENSE > 500mV at full load. For example set VSENSE = 100mV at 1.0A. Rearranging (1) gives: SE SE = SE SE I AD = 0.1/1.0 = 0.1Ω. 2) Choose ROUT to give VOUT = 1V, when VSENSE = 100mV. Rearranging (4) for ROUT gives: = SE SE = 0.01 1 0.1 x 0.01 ZXCT1008Q Document number: DS36890 Rev. 2 - 2 = 1kΩ 5 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Application Information (cont.) Referring to Figure 1, where RLOAD represents any load including DC motors, a charging battery or further circuitry that requires monitoring, RSENSE can be selected on specific requirements of accuracy, size and power rating. Figure 1. ZXCT1008Q with Additional Current Limiting Resistor RLIM and Zener Z1 An additional resistor, RLIM can be added in series with ROUT (Figure 1), to limit the current from I OUT. Any circuit connected to VOUT will be protected from input voltage transients. This can be of particular use in automotive applications where load dump and other common transients need to be considered. The Zener Z1 provides additional protection for local dump, reverse battery and high voltage transient incidents. Assuming the worst case condition of VOUT = 0V; providing a low impedance to a transient, the minimum value of RLIM is given by: RLIM(min) = (VPK – VMAX)/ IPK VPK = Peak transient voltage to be withstood VMAX = Maximum working voltage = 20V IPK = Peak output current = 40mA The maximum value of RLIM is set by VIN(MIN), VOUT(MAX) and the dropout voltage (see transfer characteristic on page 4) of the ZXCT1008Q: ( I ( A ) ) = I ( I ) D ( A ) ( A ) Where: VIN(MIN) = Minimum Supply Operating Voltage VDP = Dropout Voltage VOUT(MAX) = Maximum Operating Output Voltage ZXCT1008Q Document number: DS36890 Rev. 2 - 2 6 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Application Information (cont.) PCB Trace Shunt Resistor for Low Cost Solution The figure below shows output characteristics of the device when using a PCB resistive trace for a low cost solution in replacement for a conventional shunt resistor. The graph shows the linear rise in voltage across the resistor due to the PTC of the material and demonstrates how this rise in resistance value over temperature compensates for the NTC of the device. he figure opposite shows a CB layout suggestion. he resistor section is 25mm x 0.25mm giving approximately 150mΩ using 1oz copper. he data for the normalized graph was obtained using a 1A load current and a 100Ω output resistor. An electronic version of the PCB layout is available through Diodes applications group. Layout shows area of shunt resistor compared to SOT23 package. Not actual size. Ordering Information Packing: 7” Tape and Reel Tape Width Part Number Suffix Device Packaging (Note 9) Package Code Identification Code Quantity ZXCT1008QFTA SOT23 F 108 3000 Units 8mm Qualification Grade (Note 10) 7‖ Grade 1 Notes: 9. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. 10. ZXCT1008Q has been qualified to AEC-Q100 grade 1 and is classified as ―Automotive Grade‖ which supports PPAP documentation. See ZXCT1008 datasheet for commercial qualified version. ZXCT1008Q Document number: DS36890 Rev. 2 - 2 7 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q Marking Information (1) Package Type: SOT23 XXX : Identification Code: 108 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: SOT23 All 7° H K1 GAUGE PLANE 0.25 J K a M A L C L1 B D SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 C 2.30 2.50 2.40 D 0.89 1.03 0.915 F 0.45 0.60 0.535 G 1.78 2.05 1.83 H 2.80 3.00 2.90 J 0.013 0.10 0.05 K 0.890 1.00 0.975 K1 0.903 1.10 1.025 L 0.45 0.61 0.55 L1 0.25 0.55 0.40 M 0.085 0.150 0.110 a 8° All Dimensions in mm G F Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: SOT23 Y Z C X ZXCT1008Q Document number: DS36890 Rev. 2 - 2 Dimensions Z X Y C E Value (in mm) 2.9 0.8 0.9 2.0 1.35 E 8 of 9 www.diodes.com June 2015 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1008Q Q IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2015, Diodes Incorporated www.diodes.com ZXCT1008Q Document number: DS36890 Rev. 2 - 2 9 of 9 www.diodes.com June 2015 © Diodes Incorporated