ZXCT1081

Document overview

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

Technical content

Features

  • 3V to 40V continuous high-side voltage
  • Accurate high-side current sensing
  • Output voltage scaling x10
  • 4.5V to 12V VCC range
  • Low quiescent current: ▪ 80μA supply pin ▪ 30μA ISENSE+
  • SOT23-5 package
  • -40°C to +125°C ambient temperature range
  • An automotive-compliant part is available under separate datasheet (ZXCT1081Q)

Applications

  • Automotive current measurement
  • Industrial applications current measurement
  • Battery management
  • Overcurrent monitors
  • Power management
  • Power adapters Typical Application Circuit SENSE+ SENSE- OUT Vcc1 GND ZXCT1081 RSENSEINV CCV VOUT THE ZXCT1081 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE ZXCT1083/85/87.

Document number: DS32102 Rev. 2 - 3 2 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Pin Description 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 SENSE+

This is the positive input of the current monitor and has an input range from 40V (60V transient) down to 3V. The current through this pin varies with differential sense voltage.

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

40V (60V transient) down to 3V. Absolute Maximum Ratings (Note 1) Parameter Rating Unit Continuous Voltage on SENSE+ and SENSE- -0.6 and 45 V Transient Voltage on SENSE+ and SENSE- -0.6 and 65 V Voltage on All Other Pins -0.6 and 14 V Differential Sense Voltage, VSENSE 800 mV Operating Temperature -40 to +125 °C Storage Temperature -55 to +150 °C Maximum Junction Temperature +125 °C Package Power Dissipation 300 @ TA = +25°C (de-rate to zero at +125°C) mW Note: 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. Recommended Operating Conditions Symbol Parameter Min Max Units VIN Common-Mode Sense+ Input Range 3 40 V VCC Supply Voltage Range 4.5 12 V VSENSE Differential Sense Input Voltage Range 0 0.15 V VOUT Output Voltage Range 0 1.5 V TJ Ambient Temperature Range -40 +125 °C

Document number: DS32102 Rev. 2 - 3 3 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Electrical Characteristics (Test conditions: TA = +25°C, VIN = 12V, VCC = 5V, VSENSE = 100mV (Note 2), unless otherwise stated.) Symbol Parameter Condition Min Typ Max Unit ICC VCC Supply Current VCC = 12V 40 80 120 µA ISENSE+ SENSE+ Input Current — 15 30 60 µA ISENSE- SENSE- Input Current — 10 40 80 nA VO(0) Zero VSENSE Error (Notes 2, 3) VSENSE = 0V (Note 2) 0 — 35 mV VO(10) Output Offset Voltage (Note 4) VSENSE = 10mV (Note 2) -30 — +30 mV Gain ΔVOUT/ΔVSENSE (Note 2) VSENSE = 10mV to 150mV (Note 2) 9.95 10 10.05 — VOUTTC (Note 5) VOUT Variation with Temperature — — 30 — ppm/°C ACC Total Output Error — -3 — 3 % IOH Output Source Current VOUT = 30mV — 1 — mA IOL Output Sink Current VOUT = +30mV — 20 — µA PSRR VCC Supply Rejection Ration VCC = 4.5V to 12V 54 60 — dB CMRR Common-Mode Sense Rejection Ratio VIN + 40V to 3V 60 75 — dB BW -3dB Small-Signal Bandwidth VSENSE (AC) = 10mVPP (Note 2) — 50 — kHz Notes: 2. VSENSE = "VSENSE+" - "VSENSE-". 3. The ZXCT1081 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. 4. 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>. 5. Temperature dependent measurements are extracted from characterization and simulation results.

Document number: DS32102 Rev. 2 - 3 4 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Typical Operating Conditions (Test conditions: TA = +25°C, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV)

Document number: DS32102 Rev. 2 - 3 5 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Typical Operating Conditions (continued) (Test conditions: TA = +25°C, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV)

Document number: DS32102 Rev. 2 - 3 6 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Typical Operating Conditions (continued) (Test conditions: TA = +25°C, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV)

Document number: DS32102 Rev. 2 - 3 7 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Typical Operating Conditions (continued) (Test conditions: TA = +25°C, VCC = 5V, VSENSE+ = 12V, VSENSE = 100mV)

Document number: DS32102 Rev. 2 - 3 9 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Application Information (continued) 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 SENSE+ (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 ZXCT1081 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 ZXCT1081 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: VOUT = (VSENSE) xG + VO(10) Alternatively, the load current can be expressed as: IL = VOUT – VO(10) GxRSENSE

Document number: DS32102 Rev. 2 - 3 10 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. DIM Millimeters Inches Min Max Min Max A 0.90 1.45 0.0354 0.0570 A1 0.00 0.15 0.00 0.0059 A2 0.90 1.3 0.0354 0.0511 b 0.20 0.50 0.0078 0.0196 C 0.09 0.26 0.0035 0.0102 D 2.70 3.10 0.1062 0.1220 E 2.20 3.20 0.0866 0.1181 E1 1.30 1.80 0.0511 0.0708 e 0.95 REF 0.0374 REF e1 1.90 REF 0.0748 REF L 0.10 0.60 0.0039 0.0236 a° 0 30 0 30 Note: 6. Controlling dimensions are in millimeters. Approximate dimensions are provided in inches .

Document number: DS32102 Rev. 2 - 3 11 of 11 www.diodes.com August 2024 © 2024 Copyright Diodes Incorporated. All Rights Reserved. ZXCT1081 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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