ZXCT1080

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 11

Technical content

Features

  • 3V to 60V continuous high-side voltage
  • Accurate high-side current sensing
  • -40°C to +125°C temperature range
  • AEC-Q100 Grade 1 qualified
  • Output voltage scaling x10
  • 4.5V to 12V VCC range
  • Low quiescent current: ▪ 80μA supply pin ▪ 27μA IS+
  • SOT25 package
  • An automotive-compliant part is available under separate datasheet (ZXCT1080Q) Pin Assignments (Top View) SOT25

Applications

  • Industrial applications current measurement
  • Battery management
  • Overcurrent measurement
  • Power management
  • Automotive current measurement Typical Application Circuit 4 5 RSENSE ZXCT1080 VCC VOUT VIN GND OUT S+ S- THE ZXCT1080 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE ZXCT1082/84/86.

Document number: DS33454 Rev. 3 - 3 2 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Pin Descriptions Pin Number Pin Name Description 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 and has an input range from 60V down to 3V. The current through this pin varies with differential sense voltage.

5 S- This is the negative input of the current monitor and has an input range from

60V down to 3V. Absolute Maximum Ratings (TA = +25C) (Note 1) Parameter Rating Unit Continuous Voltage on S- and S+ -0.6 and 65 V Voltage on All Other Pins -0.6 and +14 V Differential Sense Voltage, VSENSE (Note 2) 800 mV Operating Temperature -40 to +125 °C Storage Temperature -55 to +150 °C Maximum Junction Temperature +125 °C Package Power Dissipation (Note 3) 300 (@ TA = +25°C) mW Notes: 1. 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. 2. VSENSE is defined as the differentail voltage between S+ and S - pins. 3. Assumes θJA = 420°C/W. Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Common-Mode Sense+ Input Range 3 60 V VCC Supply Voltage Range 4.5 12 V VSENSE Differential Sense Input Voltage Range 0 0.15 V VOUT Output Voltage Range (Note 4) 0 1.5 V TA Ambient Temperature Range -40 125 °C Note: 4. Based on 10x VSENSE.

Document number: DS33454 Rev. 3 - 3 3 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Electrical Characteristics (TA = +25°C, VIN = 12V, VCC = 5V, VSENSE = 100mV (Note 5), unless otherwise specified) Symbol Parameter Conditions TA Min (Note 6) Typ Max (Note 6) Unit ICC VCC Supply Current VCC = 12V VSENSE = 0V (Note 5) +25°C 40 80 120 µA Full Range — — 145 IS+ S+ Input Current VSENSE = 0V (Note 5) +25°C 15 27 42 µA Full Range — — 60 IS- S- Input Current +25°C 15 40 80 nA VO(0) Zero VSENSE Error (Notes 5, 7) +25°C 0 — 35 mV VO(10) Output Offset Voltage (Note 8) VSENSE = 10mV (Note 5) +25°C -25 — +25 mV Full Range -55 — +55 Gain ΔVOUT/ΔVSENSE (Note 5) VSENSE = 10mV to 150mV (Note 5) +25°C 9.9 10 10.1 V/V Full Range 9.8 — 10.2 VOUT TC (Note 9) 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 VIN = 60V to 3V — 68 80 — dB BW -3dB Small-Signal Bandwidth VSENSE (AC) = 10mVpp (Note 5) — — 500 — kHz Notes: 5. VSENSE = "VS+" - "VS-" 6. All Min and Max specifications over full temperature range are guaranteed by design and characterization. 7. The ZXCT1080 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. 8. For VSENSE > 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used. V O(10) is expressed as the variance about an output voltage of 100mV>. 9. Temperature dependent measurements are extracted from characterization and simulation results.

Document number: DS33454 Rev. 3 - 3 4 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Typical Characteristics (Test conditions unless otherwise stated: TA = +25°C, VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV) 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 , INPUT CURRENT (V) Fig. 2 Input Current I INPUT CURRENT (µA)S+ T = 125 蚓A T = 25 蚓A T = -40 蚓A V = 5V V = 0mV CC SENSE -50 -25 0 25 50 75 100 125 T , TEMPERATURE( 蚓 ) Fig. 3 Input Current A I INPUT CURRENT (µA)S+ 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- 0.040.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 V ,SENSE VOLTAGE (V) Fig. 5 Output Voltage SENSE V , OUTPUT VOLTAGE (V)OUT -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: DS33454 Rev. 3 - 3 5 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Typical Characteristics (continued) (Test conditions unless otherwise stated: TA = +25°C, VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV) 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 I , OUTPUT SOURCE CURRENT (mA) Fig. 8 Output Current Source OH OUTPUT VOLTAGE (mV) V = 12V V = 100mV IN SENSE V = 5VCC T = 125 蚓A T = -40 蚓A T = 0 蚓A T = 25 蚓A T = 85 蚓A 0 50m 100m 150m 9.7 9.8 9.9 10.0 10.1GAIN V , SENSE VOLTAGE (V) Fig. 9 Differential gain SENSE 0 5 10 15 20 25 30 35 40 10m 12m V = 5VCC T = 25 蚓AMB V , INPUT VOLTAGE (V) Fig. 10 Output Voltage OUTPUT VOLTAGE (V) V = 100mVSENSE V = 150mVSENSE V = 10mVSENSE V = 50mVSENSE 0 5 10 15 20 25 30 35 40 -2m -4m OUTPUT VOLTAGE (V) V , INPUT VOLTAGE (V) Fig. 11 Output Voltage TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C (µA) TA = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C 25°C

Document number: DS33454 Rev. 3 - 3 6 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Typical Characteristics (continued) (Test conditions unless otherwise stated: TA = +25°C, VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV) 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) 0 200 400 600 V = 12V V = 60V V = 5V R = 0.1 R = 30 IN IN PEAK CC SENSE LOAD TIME (ms) Fig. 16 Load Dump Waveform VOUT VOLTAGE (V) VIN -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 = 125°C TA = 85°C TA = 25°C TA = 0°C TA = -40°C TA = 25°C (µs) (µs)

Document number: DS33454 Rev. 3 - 3 7 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Typical Characteristics (continued) (Test conditions unless otherwise stated: TA = +25°C, VIN = 12V, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV) 10 100 1k 10k 100k 1M V = 12V V = 100mV V = 5V IN SENSE CC FREQUENCY (Hz) Fig. 18 Common Mode Rejection CMRR (dB) 100 1k 10k 100k 1M V = 12V V = 100mV V = 5V IN SENSE CC FREQUENCY (Hz) Fig. 19 Supply Rejection PSRR (dB)

Document number: DS33454 Rev. 3 - 3 8 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080

Application Information

The ZXCT1080 has been designed to allow it to operate with 5V supply rails while sensing common mode signals up to 60V. This makes it well suited to a wide range of industrial and power supply 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+. Fig. 20 shows the basic configuration of the ZXCT1080. Fig. 20 Typical Configuration of ZXCT1080 Load current from the input is drawn through RSENSE developing a voltage VSENSE across the inputs of the ZXCT1080. 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 ZXCT1080 is: 10RxI1 R RRIV SENSEL GT G SENSELOUT == The maximum recommended differential input voltage, V SENSE, is 150mV; it will however withstand voltages up to 800m V. This can be increased further by the inclusion of a resistor, RLIM, between S- pin and the load; typical value is of the order of 10k.

Document number: DS33454 Rev. 3 - 3 9 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 Application Information (continued) 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. 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 ZXCT1080 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 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 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: DS33454 Rev. 3 - 3 10 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080

Ordering Information

Orderable Part Number AEC-Q100 Package Part Mark Reel Size Tape Width (mm) Packing Qty. Carrier ZXCT1080E5TA Grade 1 SOT25 1080 7 8 3000 Reel Package Outline Dimensions 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 A M J LD B C H K N

Document number: DS33454 Rev. 3 - 3 11 of 11 www.diodes.com September 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1080 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 PARTICUL AR 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. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. 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