A Product Line of Diodes Incorporated ZXCT1009Q AUTOMOTIVE GRADE MICROPOWER CURRENT MONITOR Description Pin Assignments The ZXCT1009Q is a micropower high side current sense monitor. SOT23 Package Suffix - F This device eliminates the need to disrupt the ground plane when sensing a load current. It takes a high side voltage developed across a current shunt resistor VSENSE- and translates it into a proportional output current. A user defined 3 output resistor scales the output current into a ground-referenced 1 voltage. VSENSE+ The wide input voltage range of 20V down to as low as 2.5V make it IOUT 2 suitable for a range of applications. A minimum operating current of (Top View) just 4µA, combined with a SOT23 package make it a unique solution for portable battery equipment. The ZXCT1009Q has been qualified to AEC-Q100 Grade 3 and is Automotive Grade supporting PPAPs. Features Low cost, accurate high-side current sensing Output voltage scaling Up to 2.5V sense voltage 2.5V to 20V supply range 4μA quiescent current 1% typical accuracy SOT23 Applications Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Automotive Current Measurement Automotive DC Motor Stall Detection Over Current Monitor Automotive Grade Notes: Qualified to AEC-Q100 Standards for High Reliability PPAP Capable (Note 4) 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/. Typical Application Circuit ZXCT1009Q Document number: DS36990 Rev. 1 - 2 1 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q 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.) Description Voltage on any pin (relative to IOUT) Rating Unit -0.6 to 20 V 25 mA Continous output current, IOUT Continuous sense voltage, VSENSE (Note 5) -0.5 to +5 V Operating temperature, TA -40 to +85 °C Storage temperature ESD Susceptibility HBM Human Body Model MM Machine Model CDM Charged Device Model -55 to +125 °C 2 300 1 kV V kV Caution: 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. Package Thermal Data Package θJA PDIS TA = +25°C, TJ = +150°C SOT23 280°C/W 450mW ZXCT1009Q Document number: DS36990 Rev. 1 - 2 2 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Electrical Characteristics (@TA = +25°C, VIN = 5V, ROUT = 100Ω, unless otherwise specified.) Symbol Parameter Conditions VCC range IOUT VSENSE = 0V (Note 5) VSENSE = 10mV Output Current (Note 6) VSENSE = 100mV VSENSE = 200mV VSENSE = 1V Sense Voltage (Note 5) ISENSE- VSENSE- Input Current ACC Accuracy GM Transconductance, IOUT/VSENSE BW Bandwidth Notes: Limits Typ 1 90 0.975 1.95 9.6 4 104 1.002 2.0 9.98 0 RSENSE = 0.1Ω VSENSE = 200mV 20 V 15 120 1.025 2.05 10.2 µA µA mA mA mA 2500 mV 100 nA 2.5 % -2.5 VSENSE(DC) = 10mv, RF PIN = -40dBm (Note 7) ‡ VSENSE(DC) = 100mv, RF PIN = -20dBm Units Max 2.5 VIN VSENSE Min 10000 µA/V 300 2 kHz MHz 5. VSENSE is defined as the differential voltage between VSENSE+ and VSENSE- pins. VSENSE = VSENSE+ - VSENSE= VIN - VLOAD = ILOAD x RSENSE 6. Includes input offset voltage contribution 7. -20dBm = 63mVPP into 50Ω. Power Dissipation The maximum allowable power dissipation of the device for normal operation (P MAX), 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 ZXCT1009Q Document number: DS36990 Rev. 1 - 2 3 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Typical Characteristics ZXCT1009Q Document number: DS36990 Rev. 1 - 2 4 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Typical Characteristics (cont.) Application Information 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. The following text describes how to scale a load current to an output voltage. Referring to Figure 1. 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: = Figure 1: ZXCT1009Q typical circuit I AD = 0.1/1.0 = 0.1Ω. 2) Choose ROUT to give VOUT = 1V, when VSENSE = 100mV. Rearranging (4) for ROUT gives: = = 0.001 1 0.1 0.01 ZXCT1009Q Document number: DS36990 Rev. 1 - 2 = 1kΩ 5 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Application Information (cont.) Transient Protection An additional resistor, RLIM can be added in series with ROUT (Figure 2), to limit the current from IOUT. Any circuit connected to VOUT will be protected from input voltage transients. Figure 2 ZXCT1009Q with Additional Current Limiting Resistor RLIM and Zener Z1. This can be of particular use in automotive applications where load dump and other common transients need to be considered. Adding a Zener diode 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 Where: 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 3) of the ZXCT1009Q: ( I ( A ) ) = I ( I ) D + ( A ) ( A ) Where: VIN(MIN) = Minimum Supply Operating Voltage VDP = Dropout Voltage VOUT(MAX) = Maximum Operating Output Voltage 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. The figure opposite shows a CB layout suggestion. he resistor section is 25mm 0.25mm giving appro imately 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. ZXCT1009Q Document number: DS36990 Rev. 1 - 2 6 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Layout shows area of shunt resistor compared to SOT23 package. Not actual size. Ordering Information Device Packaging (Note 8) Package Code Identification Code ZXCT1009QFTA SOT23 F 109 Note: 8. 9. Packing: 7” Tape and Reel Quantity Tape Width Part Number Suffix 3000 Units 8mm 7” Qualification Grade (Note 9) Grade 3 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 ZXCT1009Q has been qualified to AEC-Q100 grade 3 and is classified as “Automotive Grade” which supports PPAP documentation. See ZXCT1009 datasheet for commercial qualified version. Marking Information XXX : Identification code : 109 Package Outline Dimensions (All Dimensions in mm) Please see AP02001 at http://www.diodes.com/datasheets/ap02002.pdf for latest version 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 0.903 1.10 1.00 K1 0.400 L 0.45 0.61 0.55 M 0.085 0.18 0.11 0° 8° All Dimensions in mm A B C H K M K1 D J F G ZXCT1009Q Document number: DS36990 Rev. 1 - 2 L 7 of 8 www.diodes.com December 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1009Q Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for latest version. Y Z C X Dimensions Value (in mm) Z 2.9 X 0.8 Y 0.9 2.0 C 1.35 E E 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. 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Copyright © 2014, Diodes Incorporated www.diodes.com ZXCT1009Q Document number: DS36990 Rev. 1 - 2 8 of 8 www.diodes.com December 2014 © Diodes Incorporated