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ZXCT1022 Low offset high-side current monitor
Description
The ZXCT1022 is a precision high-side current sense monitor. Using this type of device eliminates the need to disrupt the ground plane when sensing a load current. The ZXCT1022 provides a fixed gain of 100 for applications where minimal sense voltage is required. The very low offset voltage enables a typical accuracy of 3% for sense voltages of only 10mV, giving better tolerances for small sense resistors necessary at higher currents. The wide input voltage range of 20V down to as low as 2.5V make it suitable for a range of applications. With a minimum operating current of just 25A, combined with its SOT235 package make it suitable for portable battery equipment too.
Features
* * * * * * Accurate high-side current sensing Output voltage scaling 2.5V - 20V supply range 25mA quiescent current 1% typical accuracy SOT23-5 package
Applications
* * * * * * * Battery chargers Smart battery packs DC motor control Over current monitor Power management Level translating Programmable current source
Pinout information
NC GND VOUT
Pinout - top view
Typical application circuit
VSENSE-
VSENSE+
Ordering information
Order reference ZXCT1022E5TA Package SOT23-5 Device marking 1022 Status Released Reel size (inches) 7 Quantity per reel 3000 Tape width (mm) 8
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ZXCT1022
Absolute maximum ratings
Voltage on any pin with respect to END pin VSENSE Operating temperature Storage temperature Package power dissipation SOT23-5 -0.6V to 20V -0.6V to VIN + 0.5V -40 to 85C -55 to 150C (Tamb = 25C) 450m
Pinout information
Pin name N/C GND VOUT VSENSEVSENSE+ Pin function Not internally connected Ground Voltage output referenced to GND. Intended to drive high impedance loads High impedance negative sense voltage input Supply and positive sense voltage input
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ZXCT1022
Electrical characteristics test conditions Tamb = 25C, VIN = 15V
Symbol VIN VOUT Parameter VCC range Output voltage VSENSE = 0V VSENSE = 10mV VSENSE = 30mV VSENSE = 100mV ROUT TC (*) IQ VSENSE () ISENSE Acc Gain BW Output resistance Output temperature coefficient Ground pin current Sense voltage Load pin current Accuracy VOUT / VSENSE Bandwidth VSENSE = 0V VIN = 20V VSENSE = 0V VSENSE = 10mV VSENSE = 10mV VSENSE = 10mV VSENSE = 100mV -3 97 100 300 2 0 Conditions Min. 2.5 0 0.97 2.91 9.7 10 30 1.0 3.0 10.0 15 50 25 Limits Typ. Max. 20 100 1.03 3.09 10.3 20 300 35 180 () 100 3 103 V mV V V V k ppm A mV nA % V/V kHz MHz Unit
NOTES: (*) TC limits are determined by characterization () VSENSE = VIN - VLOAD () For linear operation maximum VSENSE is limited by operating voltage and is approximately:
VSENSE = ----------------------
( V IN - 2 ) 100
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ZXCT1022
Typical characteristics
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ZXCT1022
Typical characteristics
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ZXCT1022
Application information
The ZXCT1022 has a fixed dc voltage gain of 100. No external scaling resistors are required for the output. Output voltage is simply defined as: VOUT = 100 x VSENSE (V) Where VSENSE = VIN - VLOAD
PCB trace shunt resistor for low cost solution
Figure 1 shows a PCB layout suggestion for a low cost solution where a PCB resistive trace in replacement for a conventional shunt resistor, can be used. The resistor section is 25mm x 0.25mm giving approximately 150m using 1 oz copper. Smaller resistances can be used if required. Total circuit solution: 1 component. Shows area of 150m sense resistor compared to SOT23 package. Practical tolerance of the PCB resistor will be around 5% depending on manufacturing methods.
ZXCT1021/2
GND
Load
VOUT VIN
Figure 1 PCB layout suggestion
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ZXCT1022
Package outline - SOT23-5
DIM A A1 A2 b C D E E1 e e1 L a Min. 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 0.10 0 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
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ZXCT1022
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 labeling 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) 2007 Published by Zetex Semiconductors plc
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