ZXCT1081Q

ZXCT1080Q/ZXCT1081Q

Document overview

• Manufacturer or author: Diodes Incorporated
• PDF pages: 12

Technical content

Features

• Accurate high-side current sensing ▪ ZXCT1080Q: 3V to 60V continuous high-side voltage ▪ ZXCT1081Q: 3V to 40V continuous high-side voltage
• -40°C to +125°C temperature range
• Output voltage scaling x10
• 4.5V to 12V VCC range
• 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)
• The ZXCT1080Q and ZXCT1081Q are suitable for automotive applications requiring specific change control; these parts are AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/ Pin Assignments (Top View) SOT25

Applications

• Automotive current measurement
• Battery management
• Overcurrent measurement Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ 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. Typical Application Circuit THE ZXCT1080Q/ZXCT1081Q IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE ZXCT1082/3/4/5/6/7Q.

Document number: DS37012 Rev. 2 - 3 2 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Pin Descriptions Pin Number Pin Name Function Common ZXCT1080Q ZXCT1081Q

1 VCC This is the analog supply and provides power to

internal circuitry. — —

2 GND Ground pin — —

3 OUT Output voltage pin. nMOS source follower with 20μA bias to ground. — — 4 S+ This is the positive input of the current monitor. The current through this pin varies with differential sense voltage. Input range from 60V down to 3V Input range from 40V down to 3V 5 S- This is the negative input of the current monitor. Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4) Parameter Rating Unit Continuous Voltage on S- and S+ ZXCT1080Q (Note 5) -0.6 to 65 V ZXCT1081Q (Note 5) -0.6 to 45 Transient Voltage on S- and S+ ZXCT1081Q (Note 5) -0.6 to 65 V Voltage on All Other Pins -0.6 to +14 V Differential Sense Voltage, VSENSE (Note 6) 800 mV Operating Temperature -40 to +125 °C Storage Temperature -55 to +150 °C Maximum Junction Temperature +125 °C Package Power Dissipation (Note 7) 300 (@ TA = +25°C) mW ESD Ratings HBM ESD Human Body Model 1000 V MM ESD Machine Model 150 V CDM ESD Charged Device Model TBD V Notes: 4. Stresses greater than those listed under Absolute Maximum Ratings can cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to Absolute Maximum Ratings for extended periods can affect device reliability. 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. 5. ZXCT1080Q has a maximum transient and continuous voltage of 65V on the S+ and S - pin. The ZXCT1081Q has a maximum continuous of 45V, it however can withstand transient up to 65V. 6. VSENSE is defined as the differential voltage between S+ and S- pins. 7. Assumes θJA = 420°C/W. Recommended Operating Conditions Symbol Parameter Min Max Units VIN Common-Mode Sense+ Input Range ZXCT1080Q V ZXCT1081Q 40 VCC Supply Voltage Range 4.5 12 V VSENSE Differential Sense Input Voltage Range 0 0.15 V VOUT Output Voltage Range (Note 8) 0 1.5 V TA Ambient Temperature Range -40 +125 °C Note: 8. Based on 10x VSENSE.

Document number: DS37012 Rev. 2 - 3 3 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Electrical Characteristics (@ VIN = VS+ = 12V, VCC = 5V, VSENSE (Note 9) = 100mV, TA = +25°C, unless otherwise specified.) Symbol Parameter Conditions TA Min Typ Max Unit ICC VCC Supply Current VCC = 12V VSENSE = 0V ZXCT1080Q ZXCT1081Q +25°C 40 80 120 µA ZXCT1080Q Full range — — 145 IS+ S+ Input Current VSENSE = 0V ZXCT1080Q +25°C 15 27 42 µA ZXCT1081Q 15 30 60 ZXCT1080Q Full range — — 60 IS- S- Input Current VSENSE = 0V ZXCT1080Q +25°C 40 80 nA ZXCT1081Q 10 VO(0) Zero VSENSE Error (Note 10) ZXCT1080Q ZXCT1081Q +25°C 0 — 35 mV VO(10) Output Offset Voltage (Note 11) VSENSE = 10mV ZXCT1080Q +25°C -25 +25 mV ZXCT1081Q -30 +30 ZXCT1080Q Full range -55 — +55 Gain ΔVOUT/ΔVSENSE VSENSE = 10mV to 150mV ZXCT1080Q +25°C 9.9 10.1 V/V ZXCT1081Q 9.95 10.05 ZXCT1080Q Full range 9.8 — 10.2 VOUT TC VOUT Variation with Temperature — — — 30 — ppm/°C ACC Total Output Error — — -3 — 3 % IOH Output Source Current ΔVOUT = -30Mv — — 1 — mA IOL Output Sink Current ΔVOUT = +30mV — — 20 — µA PSRR VCC Supply Rejection Ration VCC = 4.5V to 12V — 54 60 — dB CMRR Common-Mode Sense Rejection Ratio VS+ = 60V to 3V ZXCT1080Q 68 80 — dB VS+ = 40V to 3V ZXCT1081Q 60 75 BW -3dB Small-Signal Bandwidth VSENSE (AC) = 10mVpp — — 500 — kHz Notes: 9. VSENSE = "VS+" - "VS-". 10. The ZXCT1080Q/81Q operates from a positive power rail and the internal voltage -current converter current flow is uni-directional; these result in the output offset voltage for VSENSE = 0V always being positive. 11. 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>.

Document number: DS37012 Rev. 2 - 3 4 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Typical Characteristics (@ VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 2 4 6 8 10 12 I , SUPPLY CURRENT (µA)CC V , SUPPLY VOLTAGE (V) Fig. 1 Supply Current CC V = 12V V = 0mV SENSE T = 125 蚓A T = 85 蚓A T = 25 蚓A T = 0 蚓A T = -40 蚓A 0 5 10 15 20 25 30 35 40 V = 5V V = 0mV T = 25 蚓 CC SENSE AMB V , INPUT VOLTAGE (V) Fig. 4 Sense Current I SENSE CURRENT (nA)S- -25 1.8 V = 5V V = 12V CC V = 150mVSENSE V = 100mVSENSE V = 50mVSENSE V = 10mVSENSE -50 0 10075 1255025 T , TEMPERATURE ( 蚓 ) Fig. 6 Output Voltage A 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 V , OUTPUT VOLTAGE (V)OUT TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C TA = 125°C TA = 25°C TA = -40°C (°C) 25°C (°C)

Document number: DS37012 Rev. 2 - 3 5 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Typical Characteristics (continued) (@ VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 0 5 10 15 20 25 30 T = 125 蚓A I , OUTPUT SINK CURRENT ( 渙 )OL Fig. 7 Output Current Sink T = 85 蚓A T = 25 蚓A T = 0 蚓A T = -40 蚓A V = 12V V = 100mV IN SENSE V = 5VCC V , OUTPUT VOLTAGE (mV)OUT TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C (µA) 25°C

Document number: DS37012 Rev. 2 - 3 6 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Typical Characteristics (continued) (@ VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 4 6 8 10 12 V = 10mV to 150mVSENSE V , SUPPLY VOLTAGE (V) Fig. 12 CC Normalized Output Voltage V (mV)OUT V = 12VIN T = 25 蚓A 4 6 8 10 12 V , SUPPLY VOLTAGE (V) Fig. 13 CC Normalized Output Voltage V (mV)OUT V = 12V V = 5V IN SENSE T = 125 蚓A T = 85 蚓A T = 25 蚓A T = 0 蚓A T = -40 蚓A 1k 10k 100k 1M FREQUENCY (Mhz) Fig. 14 Small Signal Bandwidth GAIN (dB) V = 12V V = 5V T = 25C V = 10mV IN CC A SENSE p-p 10M -2 0 2 4 6 8 10 12 14 0.0 0.5 1.0 1.5 TIME (盜) Fig. 15 Large Signal Pulse Response VOLTAGE (V) -2 0 2 4 6 8 10 12 14 0.90 0.95 1.00 TIME (盜) Fig. 17 Small Signal Pulse Response VOLTAGE (V) TA = 25°C TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C (µs) (µs)

Document number: DS37012 Rev. 2 - 3 7 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Typical Characteristics (continued) (@ VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise specified.) 10 100 1k 10k 100k 1M V = 12V V = 100mV V = 5V IN SENSE CC FREQUENCY (Hz) Fig. 18 Common Mode Rejection CMRR (dB)

Document number: DS37012 Rev. 2 - 3 8 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q

Application Information

The ZXCT1080Q and ZXCT1081Q have been designed to allow them to operate with 5V supply rails while sensing common mode signal s up to 60V and 40V respectively. This makes it well suited to a wide range of current measuring/monitoring applications that requi re the interface to 5V systems while sensing much higher voltages. To allow this its VCC pin can be used independently of S+. Fig. 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: 10x1 RIR RRIV SENSEL GT G SENSELOUT == The maximum recommended differential input voltage, V SENSE, 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 Fig. 21); typical value is of the order of 10k. Fig. 21 Protection/Error Sources for ZXCT1080Q/81Q Capacitor CD provides high frequency transient decoupling when used with RLIM; typical values are of the order 10pF.

Document number: DS37012 Rev. 2 - 3 9 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Application Information (continued) 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 R SENSE a compromise must be reached between in -line signal loss (including potential power dissipation effects) and small-signal accuracy. Higher values for R SENSE 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 sup ply 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 ZXCT1080 Q/81Q has been specified to operate in a linear manner over a V SENSE 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 Incorporated 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: ( ) ( )VGVV 10SENSEOUT += Alternatively the load current can be expressed as: ( )( ) GxR VV I SENSE 10OOUT L

Document number: DS37012 Rev. 2 - 3 10 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q

Ordering Information

Orderable Part Number Package Package Code Identification Code Tape Width (mm) Packing Qty. Carrier ZXCT1080QE5TA SOT25 E5 1080 8 3000 7” Tape & Reel ZXCT1081QE5TA SOT25 E5 1081 8 3000 7” Tape & Reel Marking Information XXXX: Identification Code

Document number: DS37012 Rev. 2 - 3 11 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. SOT25 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SOT25 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 Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 2.40 C2 0.95 A M J LD B C H K N X Z Y C2C2 G

Document number: DS37012 Rev. 2 - 3 12 of 12 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080Q/ZXCT1081Q IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTI CULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. 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