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| ZXCT1041 Bidirectional precision high-side current monitor Description The ZXCT1041 is a bidirectional precision highside current sense monitor. The output voltage is proportional to the differential input voltage. Direction of current flow is indicated by the Flag pin. The ZXCT1041 provides a fixed gain of 10 for applications where minimal sense voltage is required. The very low offset voltage enables a typical accuracy of 2% for sense voltages of only 10mV, giving better tolerances for small sense resistors necessary at higher currents. The wide input voltage range of 18V down to as low as 2.7V make it suitable for a range of applications. A minimum operating current of just 40 A, combined with a SOT23-5 package makes this part suitable for portable battery equipment. Features * * * * * * Bidirectional high side measurement Output voltage scaling x10 2.7V to 20V high side voltage 35A quiescent current 1% typical accuracy SOT23-5 package Applications * * * * Battery management Over current monitor Battery gas gauging Motor control Typical application circuit VIN+ RSENSE VIN- Pin connections 4 5 Flag GND VOUT VSENSE- VSENSE+ VSENSEZXCT1041 GND VOUT 3 1 Flag VSENSE+ 2 VOUT Ordering information Order code ZXCT1041E5TA Package SOT23-5 Partmark 1041 Reel size (inches) 7 Tape width (mm) 8 Quantity per reel 3000 Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 1 www.zetex.com ZXCT1041 Absolute maximum ratings Voltage on VSENSE- and VSENSE+ Voltage on all other pins Vsense [(VSENSE+) - (VSENSE-)] Operating temperature, TA Storage temperature Maximum junction temperature, TJ Package power dissipation -0.6 to 20V -0.6V to (VSENSE+/ VSENSE-) +0.6V +/-6V -40 to 125C -55 to 150C 150C 300mW at TA = 25C (De-rate to zero at 150C) Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Recommended operating conditions Parameter VSENSE Flag VSENSE VOUT TA Common-mode sense input range Current direction flag output Differential sense input voltage range Output voltage range Ambient temperature range Min. 2.7 0 0 0 -40 Max. 20 VSENSE 0.8 VSENSE -1.5 125 Units V V V V C Pin function table Pin 1 Name Flag Description This is the current direction pin. It is open collector and allows the logic high level to be set independent of VSENSE+ voltage. Low indicates VSENSE+ is greater than VSENSEGround pin Output voltage pin This is the positive input of the current monitor. It also acts as the supply voltage pin providing current for internal circuitry. The current through this pin varies with differential sense voltage This is the negative input of the current monitor. The current through this pin varies with differential sense voltage 2 3 4 GND OUT VSENSE+ 5 VSENSE- Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 2 www.zetex.com ZXCT1041 Electrical characteristics Test conditions TA = 25C, VSENSE+ = 10V, VSENSE = 100mV Symbol IQ ISENSE+ ISENSEVOUT Parameter Ground pin current VSENSE+ input current VSENSE = 0V VSENSE- input current Output voltage [flag high] VSENSE = 0V VSENSE = +150mV VSENSE = +100mV VSENSE = +30mV VSENSE = 0V [flag low] VSENSE = -30mV VSENSE = -100mV VSENSE = -150mV VOUT TC Gain Accuracy Accuracy BW CMRR Flag TP VFL IFH VOUT variation with temperature VOUT/VSENSE Total output error (Gain + offset) Total output error (Gain + offset) Bandwidth VSENSE+ common mode rejection ratio Flag trip point Flag low output voltage Flag high leakage current VSENSE = 100mV VSENSE = -100mV VSENSE(DC) = 100mV VSENSE(AC) = 63mVPP VIN = 2.7 to 20V Referred to VSENSE ISINK = 100 A VOH = 5V TBD -2.5 60 -2 -5 300 60 +2.5 200 1 VSENSE = 100mV Conditions Min. 15 10 10 1.55 1.02 309 0 285 0.95 1.42 300 1 1.50 30 10 2 5 % % kHz dB mV mV A Typ. 35 17 17 1.5 1 300 Max. 50 24 24 1.45 0.98 291 15 315 1.05 1.58 Units A A A V V mV mV mV V V ppm/C NOTES: (a) - VSENSE = "VSENSE+" - "VSENSE-" (b) Temperature dependent measurements are extracted from characterisation and simulation results. Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 3 www.zetex.com ZXCT1041 Typical characteristics VSENSE+ = 10V, VSENSE = 100mV, TA = 25C unless otherwise stated Y-axis VOUT VOUT VOUT VOUT Error Error VOUT ISENSE+ ISENSE+ ISENSEISENSEDiff gain VOUT Flag X-axis VSENSE TA VSENSE+ VSENSE+ Conditions TA = -40C, 0C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V VSENSE = 10mV, 30mV, 100mV. VSENSE+ = 10V and 3.6V TA = -40C, 0C, 25C, 85C, 125C. VSENSE+ = 100mV and -100mV. VSENSE+ swept from 0 to 20V VSENSE+ = 100mV and -100mV. TA = 0C, 25C and 85C VSENSE+ zoomed in 2.6V to 4.2V +ve VSENSE TA = -40C, 0C, 25C, 85C, 125C -ve VSENSE VSENSE+ VSENSE VSENSE+ VSENSE VSENSE+ VSENSE IOUT VSENSE TA = -40C, 0C, 25C, 85C, 125C VSENSE = 10mV, 0.1, 0.2, 0.4, 0.5V. VSENSE+ = 10V and 3.6V TA = -40C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V TA = -40C, 25C, 85C, 125C. VSENSE = 0 TA = -40C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V TA = -40C, 25C, 85C, 125C. VSENSE = 0 VSENSE+ = 10V and 3.6V. TA = -40C, 25C, 85C, 125C TA = -40C, 0C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V. VSENSE = 100mV TA = -40C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V VSENSE swept over 5mV AC and transients Small signal Frequency TA = -40C, 25C, 85C, 125C. VSENSE+ = 10V and 3.6V bandwidth VSENSE(DC) = 10mV and 100mV. VSENSE(AC) = 10mVPP CMRR Large signal Frequency TA = -40C, 25C, 85C, 125C. VSENSE+(DC) = 10V and 3.6V. VSENSE+(AC) = 10mVPP. VSENSE(DC) = 10mV and 100mV time VSENSE = 0 to 200mV to 0 VSENSE = 0 to -200mV to 0 VSENSE = 200mV to -200mV to 200mV Small signal Time VSENSE = 0 to 20mV to 0 VSENSE = 0 to -20mV to 0 VSENSE = 20mV to -20mV to 20mV Flag Time VSENSE = 200mV to -200mV to 200mV VSENSE = 20mV to -20mV to 20mV Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 4 www.zetex.com ZXCT1041 Application information The ZXCT1041 uses two current monitors in anti-parallel to provide bidirectional current measurement. The integrated resistors while having a broad actual value variance provide very good matching to one another; this provides very tight gain matching from forward current measurement to reverse current management and removes the need to trim the resistor values. The internal transconductance setting resistors have a nominal value of 1.5k thereby setting the internal transconductance to 1mA/V of VSENSE. The outputs of both current monitors (current) are summed into an internal common gain-setting resistor of 15k . This sets the overall gain to 10 which has a very small variance due to the very good matching of internal transistors. To improve accuracy the offset of amplifier 1 is trimmed. The direction of measured current flow is determined by comparing the voltages applied to the bases of transconductance transistors (Q1 and Q2). For maximum versatility the flag output uses an open collector; this allows the ZXCT1041 to monitor rails at a much higher potential than what the flag output is interfacing to. A common application for micro-power current monitors is measuring the discharge current of a rechargeable lithium ion/polymer battery. The ZXCT1041 enables measuring both the charge and discharge current into the battery and with its wide operating voltage of 2.5 to 20V enables it to measure the currents in to/ out of up to 4 cells connected in series. Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 5 www.zetex.com ZXCT1041 Load SENSE- SENSE+ Battery charger control ZXCT1041 Flag GND OUT Battery 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 ZXCT1041 has been designed to operate with VSENSE of the order of 50mV to 150mV. Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 6 www.zetex.com ZXCT1041 Packaging details - SOT23-5 DIM Min. A A1 A2 b C D E E1 e e1 L a 0.10 0 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30 Millimeters Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 0.95 REF 1.90 REF 0.60 30 0.0039 0 Min. 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511 Inches Max. 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708 0.0374 REF 0.0748 REF 0.0236 30 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 7 www.zetex.com ZXCT1041 Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of these circuit applications, under any circumstances. Life support Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labelling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Reproduction The product specifications contained in this publication are issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. Terms and Conditions All products are sold subjects to Zetex' terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement. For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office. Quality of product Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer. To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. ESD (Electrostatic discharge) Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with WEEE and ELV directives. Product status key: "Preview" Future device intended for production at some point. Samples may be available "Active" Product status recommended for new designs "Last time buy (LTB)" Device will be discontinued and last time buy period and delivery is in effect "Not recommended for new designs" Device is still in production to support existing designs and production "Obsolete" Production has been discontinued Datasheet status key: "Draft version" This term denotes a very early datasheet version and contains highly provisional information, which may change in any manner without notice. "Provisional version" This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, changes to the test conditions and specifications may occur, at any time and without notice. "Issue" This term denotes an issued datasheet containing finalized specifications. However, changes to specifications may occur, at any time and without notice. Zetex sales offices Europe Zetex GmbH Kustermann-park Balanstrae 59 D-81541 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com (c) 2006 Published by Zetex Semiconductors plc Issue 1 - November 2006 (c) Zetex Semiconductors plc 2006 8 www.zetex.com |
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