A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q AUTOMOTIVE GRADE 60/40V HIGH-SIDE CURRENT MONITOR Description Pin Assignments The ZXCT1080Q and ZXCT1081Q are high side current sense monitors with a voltage output and a fixed gain of 10. Using this VCC device eliminates the need to disrupt the ground plane when sensing a load current. 1 5 S- GND 2 The wide input voltage range of 60V and 40V, respectively, down to as low as 3V make it suitable for a range of automotive applications OUT 3 with 60V and 40V load dump withstand capabilities. 74 S+ The separate supply pin (VCC) allows the device to continue functioning under short circuit conditions. The ZXCT1080Q and ZXCT1081Q have an extended ambient operating temperature range of -40°C to 125°C enabling it to be used in a wide range of automotive applications including. The ZXCT1080Q and ZXCT1081Q have been qualified to AEC-Q100 Grade 1 and are Automotive Grade supporting PPAPs. Features Applications Accurate high-side current sensing ZXCT1080Q : 3V to 60V continuous high side voltage Battery management ZXCT1081Q : 3V to 40V continuous high side voltage Over-current measurement -40°C to +125°C temperature range Output voltage scaling x10 4.5V to 12V VCC range Automotive current measurement Low quiescent current: 80μA supply pin 27μA IS+ Green Molding in SOT25 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) 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/. Typical Application Circuit ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 1 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Pin Descriptions Pin Name 1 2 3 VCC GND OUT 4 S+ 5 S- Function Common This is the analogue supply and provides power to internal circuitry Ground pin Output voltage pin. NMOS source follower with 20μA bias to ground This is the positive input of the current monitor. The current through this pin varies with differential sense voltage This is the negative input of the current monitor. ZXCT1080Q ZXCT1081Q — — — — — — Input range from 60V Input range from 40V down to 3V down to 3V Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Parameter Rating -0.6 to 65 -0.6 to 45 -0.6 to 65 -0.6 to +14 Unit 800 mV -40 to +125 -55 to +150 +125 300 (@ TA = +25°C) °C °C °C ZXCT1080Q (Note 5) ZXCT1081Q (Note 5) ZXCT1081Q (Note 5) Continuous voltage on S- and S+ Transient voltage on S- and S+ Voltage on all other pins Differential sense voltage, VSENSE (Note 6) Operating temperature Storage Temperature Maximum Junction Temperature Package Power Dissipation (Note 7) V V V mW ESD Ratings HBM ESD MM ESD CDM ESD Caution: Human Body Model Machine Model Charged Device Model 1000 150 TBD V V V 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 conditions between maximum recommended operating conditions and absolute maximum ratings 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. Notes: 5. ZXCT1080 has a maximum transient and continuous voltage of 65V on the S+ and S- pin. The ZXCT1081 has a maximum continuous of 45V, it however can withstand transient up to 65V. VSENSE is defined as the differential voltage between S+ and S- pins Assumes θJA = 420°C/W 6. 7. Recommended Operating Conditions Symbol VIN Common-mode Sense+ Input Range Min ZXCT1080Q ZXCT1081Q Supply Voltage Range 3 Max 60 40 Units V 4.5 12 V Differential Sense Input Voltage Range 0 0.15 V VOUT Ouput Voltage Range (Note 8) 0 1.5 V TA Ambient Temperature Range -40 +125 °C VCC VSENSE Note: Parameter 8. Based on 10x VSENSE ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 2 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Electrical Characteristics (@ VIN = VS+ = 12V, VCC = 5V, VSENSE (Note 6) = 100mV, TA = +25°C, unless otherwise specified.) Symbol Parameter ICC VCC Supply Current S+ Input Current IS+ Conditions ZXCT1080Q VCC = 12V, ZXCT1081Q VSENSE =0V ZXCT1080Q ZXCT1080Q ZXCT1081Q ZXCT1080Q ZXCT1080Q ZXCT1081Q ZXCT1080Q ZXCT1081Q ZXCT1080Q VSENSE = 0V S- Input Current IS- VSENSE = 0V VO(0) Zero VSENSE error (Note 9) VO(10) Output Offset Voltage (Note 10) Gain ∆VOUT/∆VSENSE VSENSE = 10mV ZXCT1081Q ZXCT1080Q ZXCT1080Q ZXCT1081Q ZXCT1080Q VSENSE = 10mV to 150mV TA Min Typ Max +25°C 40 80 120 Full range — — 145 15 15 — 15 10 27 30 — 42 60 60 µA 40 80 nA 0 — 35 mV +25°C Full range +25°C +25°C +25°C Full range +25°C -25 -30 -55 9.9 9.95 9.8 — — 10 µA +25 +30 +55 10.1 10.05 10.2 — Units mV V/V VOUT TC VOUT variation with temperature — Full range — — 30 — ppm/°C ACC Total output error — — -3 — 3 % — mA IOH Output Source Current ∆VOUT = -30Mv — 1 — IOL Output Sink Current ∆VOUT = +30mV — — 20 — µA PSRR VCC Supply Rejection Ration VCC = 4.5V to 12V — 54 60 — dB 68 80 60 75 — dB — 500 — kHz CMRR Common-Mode Sense Rejection Ratio BW -3dB small signal bandwidth Notes: VS+ = 60V to 3V ZXCT1080Q VS+ = 40V to 3V ZXCT1081Q VSENSE (AC) = 10mVpp — — 6. 9. VSENSE = "VS+" - "VS-" The ZXCT1080Q/81Q operates from a positive power rail and the internal voltage-current converter current flow is unidirectional; these result in the output offset voltage for VSENSE = 0V always being positive. 10. For VSENSE > 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used. VO(10) is expressed as the variance about an output voltage of 100mV>. ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 3 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Typical Characteristics (@ VIN = 12V, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 70 20 IS+ INPUT CURRENT (µA) ICC, SUPPLY CURRENT (µA) TA = 125°C 65 TA = 85°C 60 T A = 25°C TA = 0°C 55 TA = -40°C TA = 125°C TA = 25°C TA = -40°C 10 VCC = 5V VSENSE = 0mV VS+ = 12V VSENSE = 0mV 50 2 15 4 6 8 10 VCC, SUPPLY VOLTAGE (V) Fig. 1 Supply Current 5 12 0 5 10 15 20 25 30 35 VS+, INPUT CURRENT (V) Fig. 2 Input Current 40 40 35 IS- SENSE CURRENT (nA) IS+ INPUT CURRENT (µA) 20 15 10 30 25 20 15 10 VCC = 5V VSENSE = 0mV T AMB = 25°C 5 -25 0 25 50 75 100 TA, TEMPERATURE(°C) Fig. 3 Input Current 0 0 125 1.6 1.8 1.4 1.6 1.2 1.0 0.8 0.6 0.4 VOUT, OUTPUT VOLTAGE (V) VOUT, OUTPUT VOLTAGE (V) 5 -50 0.2 ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 1.2 VSENSE = 150mV 35 40 VCC = 5V VS+ = 12V VSENSE = 100mV 1.0 0.8 0.6 VSENSE = 50mV 0.4 0.0 -50 4 of 11 www.diodes.com 10 15 20 25 30 VS+, INPUT VOLTAGE (V) Fig. 4 Sense Current 1.4 0.2 0.0 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 VSENSE,SENSE VOLTAGE (V) Fig. 5 Output Voltage 5 VSENSE = 10mV -25 0 25 50 75 100 TA, TEMPERATURE (°C) Fig. 6 Output Voltage 125 March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Typical Characteristics (cont.) (@ VIN = 12V, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 0 VIN = 12V VCC = 5V VSENSE = 100mV 25 -1 TA = 125°C OUTPUT VOLTAGE (mV) VOUT, OUTPUT VOLTAGE (mV) 30 T A = 85°C 20 TA = 25°C TA = 0°C 15 TA = -40°C 10 5 0 -2 TA = -40°C -3 TA = 0°C -4 TA = 25°C -5 TA = 85°C VIN = 12V VCC = 5V VSENSE = 100mV -6 0 -7 0.0 5 10 15 20 25 30 IOL , OUTPUT SINK CURRENT (µA) Fig. 7 Output Current Sink T A = 125°C 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IOH , OUTPUT SOURCE CURRENT (mA) Fig. 8 Output Current Source 10.1 12m OUTPUT VOLTAGE (V) GAIN 10.0 9.9 9.8 9.7 0 VSENSE = 150mV 10m 8m VSENSE = 100mV VSENSE = 50mV VSENSE = 10mV 6m 4m 2m VCC = 5V TAMB = 25°C 0 50m 100m VSENSE, SENSE VOLTAGE (V) Fig. 9 Differential gain 150m 0 5 10 15 20 25 30 VS+, INPUT VOLTAGE (V) Fig. 10 Output Voltage 35 40 OUTPUT VOLTAGE (V) 6m 4m 2m 0 -2m -4m 0 5 10 15 20 25 30 VS+, INPUT VOLTAGE (V) Fig. 11 Output Voltage ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 35 40 5 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Typical Characteristics (cont.) (@ VIN = 12V, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 8 14 VIN = 12V T A = 25°C 12 6 TA = 125°C TA = 85°C 10 VOUT (mV) VOUT (mV) 8 4 2 T A = 25°C 6 TA = 0°C 4 T A = -40°C 2 VSENSE = 10mV to 150mV 0 0 -2 VIN = 12V VSENSE = 5V -4 4 6 8 10 VCC, SUPPLY VOLTAGE (V) Fig. 12 Normalized Output Voltage 20 1.5 15 1.0 10 VIN = 12V VCC = 5V TA = 25C VSENSE = 10mVp-p 5 1k 10k 100k 1M FREQUENCY (Mhz) Fig. 14 Small Signal Bandwidth 60 6 8 10 VCC, SUPPLY VOLTAGE (V) Fig. 13 Normalized Output Voltage 12 0.5 0.0 -2 10M VIN = 12V VIN PEAK = 60V VCC = 5V 50 0 2 4 6 8 10 12 14 TIME (µs) Fig. 15 Large Signal Pulse Response 0 2 4 1.00 RSENSE = 0.1 RLOAD = 30 VIN 40 VOLTAGE (V) VOLTAGE (V) 4 12 VOLTAGE (V) GAIN (dB) -2 30 20 0.95 VOUT 10 0.90 0 0 200 400 600 TIME (ms) Fig. 16 Load Dump Waveform ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 -2 6 of 11 www.diodes.com 6 8 10 12 14 TIME (µs) Fig. 17 Small Signal Pulse Response March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Typical Characteristics (cont.) (@ VIN = 12V, VCC = 5V, VSENSE+ =12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 70 80 70 60 50 50 PSRR (dB) CMRR (dB) 60 40 30 20 10 0 10 40 30 20 VIN = 12V VSENSE = 100mV VCC = 5V 100 1k 10k 100k FREQUENCY (Hz) Fig. 18 Common Mode Rejection ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 10 0 100 1M 7 of 11 www.diodes.com VIN = 12V VSENSE = 100mV VCC = 5V 1k 10k 100k FREQUENCY (Hz) Fig. 19 Supply Rejection 1M March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Application Information The ZXCT1080Q and ZXCT1081Q have been designed to allow them to operate with 5V supply rails while sensing common mode signals up to 60V and 40V respectively. This makes it well suited to a wide range of current measuring/monitoring applications that require the interface to 5V systems while sensing much higher voltages. To allow this its VCC pin can be used independently of S+. Figure 20 shows the basic configuration of the ZXCT1080Q and ZXCT1081Q. Fig. 20 Typical Configuration of ZXCT1080Q/81Q Load current from the input is drawn through RSENSE developing a voltage VSENSE across the inputs of the ZXCT1080Q/81Q. The internal amplifier forces VSENSE across internal resistance RGT causing a current to flow through MOSFET M1. This current is then converted to a voltage by RG. A ratio of 10:1 between RG and RGT creates the fixed gain of 10. The output is then buffered by the unity gain buffer. The gain equation of the ZXCT1080Q and ZXCT1081Q is: VOUT IL RSENSE RG 1 x IL RSENSE 10 RGT The maximum recommended differential input voltage, VSENSE, is 150mV; it will however withstand voltages up to 800mV. This can be increased further by the inclusion of a resistor, RLIM, between S- pin and the load (see figure 21); typical value is of the order of 10k. Fig. 21 Protection/Error Sources for ZXCT1080 Capacitor CD provides high frequency transient decoupling when used with RLIM; typical values are of the order 10pF. ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 8 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Application Information (cont.) For best performance RSENSE should be connected as close to the S+ (and SENSE) pins; minimizing any series resistance with RSENSE. When choosing appropriate values for RSENSE a compromise must be reached between in-line signal loss (including potential power dissipation effects) and small signal accuracy. Higher values for RSENSE gives better accuracy at low load currents by reducing the inaccuracies due to internal offsets. For best operation the ZXCT1080Q/81Q has been designed to operate with VSENSE of the order of 50mV to 150mV. Current monitors' basic configuration is that of a unipolar voltage to current to voltage converter powered from a single supply rail. The internal amplifier at the heart of the current monitor may well have a bipolar offset voltage but the output cannot go negative; this results in current monitors saturating at very low sense voltages. As a result of this phenomenon the ZXCT1080Q/81Q has been specified to operate in a linear manner over a VSENSE range of 10mV to 150mV range, however it will still be monotonic down to VSENSE of 0V. It is for this very reason that Diodes has specified an input offset voltage (VO(10)) at 10mV. The output voltage for any VSENSE voltage from 10mV to 150mV can be calculated as follows: VOUT VSENSE G V 10 Alternatively the load current can be expressed as: IL ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 VOUT VO10 GxRSENSE 9 of 11 www.diodes.com March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Ordering Information Order Reference Package ZXCT1080QE5TA SOT25 ZXCT1081QE5TA SOT25 Packing: 7” Tape and Reel Package Identification Code Code Quantity Tape Width Part Number Suffix E5 1080 3000 8 TA E5 1081 3000 8 Qualification Grade TA Automotive Grade Automotive Grade Marking Information XXXX : Identification code Package Outline Dimensions (All Dimensions in mm) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. A B C H K J M N D ZXCT1080Q/ ZXCT1081Q Document number: DS37012 Rev. 1 - 2 L 10 of 11 www.diodes.com SOT25 Dim Min Max Typ A 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D 0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 K 1.00 1.30 1.10 L 0.35 0.55 0.40 M 0.10 0.20 0.15 N 0.70 0.80 0.75 0° 8° All Dimensions in mm March 2014 © Diodes Incorporated A Product Line of Diodes Incorporated ZXCT1080Q/ ZXCT1081Q Suggested Pad Layout (All Dimensions in mm) Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for latest version. C2 Z C2 Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 G C1 C2 Y 2.40 0.95 X 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). 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