ZXCT1041 ZETEX | Alldatasheet
Document overview
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Technical content
Features
- Bidirectional high side measurement Output voltage scaling x10 2.7V to 20V high side voltage 35µA quiescent current 1% typical accuracy SOT23-5 package Pin connections The very low offset voltage enables a typical accuracy of 2% for se nse 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 /H9262A, combined with a SOT23-5 package makes this part suitable for portable battery equipment.
Applications
Battery management Over current monitor Battery gas gauging Motor control Typical application circuit
Ordering information
Order code Package Partmark Reel size (inches) Tape width (mm) Quantity per reel ZXCT1041E5TA SOT23-5 1041 7 8 3000
Issue 1 - November 2006 2 www.zetex.com © Zetex Semiconductors plc 2006 Absolute maximum ratings Voltage on VSENSE- and VSENSE+ -0.6 to 20V Voltage on all other pins -0.6V to (V SENSE+/ VSENSE-) +0.6V Vsense [(VSENSE+) - (VSENSE-)] +/-6V Operating temperature, TA -40 to 125°C Storage temperature -55 to 150°C Maximum junction temperature, T J 150°C Package power dissipation 300mW at T A = 25°C (De-rate to zero at 150°C) 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 Pin function table Parameter Min. Max. Units VSENSE± Common-mode sense input range 2.7 20 V Flag Current direction flag output 0 V SENSE± V VSENSE Differential sense input voltage range 0 ±0.8 V VOUT Output voltage range 0 V SENSE± -1.5 V TA Ambient temperature range -40 125 °C Pin Name Description 1 Flag 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 VSENSE-
2 GND Ground pin
3 OUT Output voltage pin
4V SENSE+ 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 5V SENSE- This is the negative input of the current monitor. The current through this pin varies with differential sense voltage
Issue 1 - November 2006 3 www.zetex.com © Zetex Semiconductors plc 2006
Electrical characteristics
Test conditions TA = 25°C, VSENSE+ = 10V, VSENSE = 100mV NOTES: (a) - VSENSE = "VSENSE+" - "VSENSE-" (b) Temperature dependent measurements are extracted from characterisation and simulation results. Symbol Parameter Conditions Min. Typ. Max. Units IQ Ground pin current 15 35 50 µA ISENSE+V SENSE+ input current V SENSE = 0V 10 17 24 µA ISENSE-V SENSE- input current V SENSE = 0V 10 17 24 µA VOUT Output voltage [flag high] VSENSE = +150mV 1.55 1.5 1.45 V VSENSE = +100mV 1.02 1 0.98 V VSENSE = +30mV 309 300 291 mV VSENSE = 0V 0 15 mV [flag low] V SENSE = -30mV 285 300 315 mV VSENSE = -100mV 0.95 1 1.05 V VSENSE = -150mV 1.42 1.50 1.58 V VOUT TC V OUT variation with temperature VSENSE = ±100mV 30 ppm/ ºC Gain V OUT/VSENSE 10 Accuracy Total output error (Gain + offset) VSENSE = 100mV -2 2 % Accuracy Total output error (Gain + offset) VSENSE = -100mV -5 5 % BW Bandwidth V SENSE(DC) = 100mV VSENSE(AC) = 63mVPP 300 kHz CMRR V SENSE+ common mode rejection ratio VIN = 2.7 to 20V TBD 60 dB Flag TP Flag trip point Referred to V SENSE -2.5 +2.5 mV VFL Flag low output voltage ISINK = 100/H9262A6 0 2 0 0 m V IFH Flag high leakage current VOH = 5V 1 /H9262A
Issue 1 - November 2006 4 www.zetex.com © Zetex Semiconductors plc 2006 Typical characteristics VSENSE+ = 10V, VSENSE = 100mV, TA = 25°C unless otherwise stated Y-axis X-axis Conditions VOUT VSENSE T A = -40°C, 0°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V VOUT TA VSENSE = 10mV, 30mV, 100mV. VSENSE+ = 10V and 3.6V VOUT VSENSE+ T A = -40°C, 0°C, 25°C, 85°C, 125°C. VSENSE+ = 100mV and -100mV. VSENSE+ swept from 0 to 20V VOUT VSENSE+ V SENSE+ = 100mV and -100mV. TA = 0°C, 25°C and 85°C VSENSE+ zoomed in 2.6V to 4.2V Error +ve VSENSE TA = -40°C, 0°C, 25°C, 85°C, 125°C Error -ve VSENSE TA = -40°C, 0°C, 25°C, 85°C, 125°C ISENSE+ VSENSE TA = -40°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V ISENSE+ VSENSE+ TA = -40°C, 25°C, 85°C, 125°C. VSENSE = 0 ISENSE- VSENSE TA = -40°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V ISENSE- VSENSE+ TA = -40°C, 25°C, 85°C, 125°C. VSENSE = 0 Diff gain V SENSE VSENSE+ = 10V and 3.6V. TA = -40°C, 25°C, 85°C, 125°C VOUT IOUT TA = -40°C, 0°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V. VSENSE = ±100mV Flag V SENSE TA = -40°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V VSENSE swept over ±5mV AC and transients Small signal bandwidth Frequency T A = -40°C, 25°C, 85°C, 125°C. VSENSE+ = 10V and 3.6V VSENSE(DC) = 10mV and 100mV. VSENSE(AC) = 10mVPP CMRR Frequency T A = -40°C, 25°C, 85°C, 125°C. VSENSE+(DC) = 10V and 3.6V. VSENSE+(AC) = 10mVPP . VSENSE(DC) = 10mV and 100mV Large signal time V SENSE = 0 to 200mV to 0 VSENSE = 0 to -200mV to 0 VSENSE = 200mV to -200mV to 200mV Small signal Time V SENSE = 0 to 20mV to 0 VSENSE = 0 to -20mV to 0 VSENSE = 20mV to -20mV to 20mV Flag Time V SENSE = 200mV to -200mV to 200mV VSENSE = 20mV to -20mV to 20mV
Issue 1 - November 2006 5 www.zetex.com © Zetex Semiconductors plc 2006
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 ve ry 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/H9024 thereby setting the internal transconductance to 1mA/V of V SENSE. The outputs of both current monitors (current) are summed into an internal common gain-setting resistor of 15k /H9024. 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 6 www.zetex.com © Zetex Semiconductors plc 2006 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 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. GND OUT Flag SENSE+SENSE- ZXCT1041 Load Battery charger control Battery
Issue 1 - November 2006 7 www.zetex.com © Zetex Semiconductors plc 2006 Packaging details - SOT23-5 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches 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 1.30 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°
Issue 1 - November 2006 8 www.zetex.com © Zetex Semiconductors plc 2006 Zetex sales offices Europe Zetex GmbH Kustermann-park Balanstraße 59 D-81541 München Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc
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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 © 2006 Published by Zetex Semiconductors plc 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 desi gn ideas. It is the responsibility of the user to ensure that t he circuit is fit for the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoev er is assumed by Zetex with respect to the accuracy or use of such in formation, or infringement of patents or other intellectual prop erty rights arising from such use or otherwise. Zetex does not assume any le gal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restricti on or otherwise) for any damages, loss of profit, business, con tract, 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 proper ly 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 devi ce 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 issu ed 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 bet ween 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 dire ctly 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 malfunc tion to degradation of function or performance in use over ti me. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to envir onmental excellence in all aspects of its operations which includes meeting or exce eding regulatory requirements with respect to the use of hazardous s ubstances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the Ro HS 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 ha s been discontinued Datasheet status key: “Draft version” This term denotes a very early datasheet ver sion 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 cont aining finalized specifications. However, changes to specifications may occur, at any time and without notice.