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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 SOT23-5 package make it suitable for portable battery equipment too. APPLICATIONS * Battery chargers * Smart battery packs * DC motor control * Over current monitor * Power management * Level translating * Programmable current source FEATURES * Accurate high-side current sensing * Output voltage scaling * 2.5V - 20V supply range * 25 A quiescent current * 1% typical accuracy * SOT23-5 package TYPICAL CIRCUIT APPLICATION ORDERING INFORMATION DEVICE REEL SIZE 7" TAPE WIDTH 8mm QUANTITY PER REEL ZXCT1022E5TA 3,000 units DEVICE MARKING 1022 PROVISIONAL ISSUE J - APRIL 2004 1 SEMICONDUCTORS ZXCT1022 Absolute Maximum Ratings Voltage on any pin Vsense Operating temperature Storage temperature Package power dissipation SOT23 -0.6V to 20V -0.6V to Vin + 0.5V -40 to 85C -55 to 150C (TA = 25C) 450mW ELECTRICAL CHARACTERISTICS Test Conditions TA = 25C, Vin = 15V SYMBOL PARAMETER CONDITIONS Min V in V out V CC range Output voltage (ZXCT1022) V sense = 0V V sense = 10mV V sense = 30mV V sense = 100mV R out Tc Iq V sense (2) I sense Acc Gain BW Output resistance Output temperature coefficient Ground pin current Sense voltage Load pin input current Accuracy V out / V sense Bandwidth V sense = 10mV V sense = 10mV V sense = 10mV V sense = 100mV NOTES (2) Vsense= Vin - Vload TC Limits are determined by characterization. LIMITS Typ Max 20 30 1.0 3.0 10.0 15 50 100 1.03 3.09 10.3 20 300 35 1.5 100 -3 0.97 1.0 300 2 3 1.03 UNIT 2.5 0 0.97 2.91 9.7 10 V mV V V V K ppm A V nA % V kHz MHz V sense = 0V 0 25 PROVISIONAL ISSUE J - APRIL 2004 SEMICONDUCTORS 2 ZXCT1022 TYPICAL CHARACTERISTICS PROVISIONAL ISSUE J - APRIL 2004 3 SEMICONDUCTORS ZXCT1022 TYPICAL CHARACTERISTICS BLOCK DIAGRAM PROVISIONAL ISSUE J - APRIL 2004 SEMICONDUCTORS 4 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 The figure below 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. GND Load 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. PINOUT PIN NAME N/C GND V out Load V in 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 Top view PROVISIONAL ISSUE J - APRIL 2004 5 SEMICONDUCTORS ZXCT1022 PACKAGE DIMENSIONS SOT23-5 PACKAGE DIMENSIONS DIM Millimetres MIN A A1 A2 b C D E E1 e e1 L a 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 MAX 1.45 0.15 1.3 0.50 0.20 3.00 3.00 1.75 Inches MIN 0.035 0.00 0.035 0.014 0.0035 0.110 0.102 0.059 MAX 0.057 0.006 0.051 0.020 0.008 0.118 0.118 0.069 0.95 REF 1.90 REF 0.10 0 0.60 10 0.037 REF 0.075 REF 0.004 0 0.024 10 (c) Zetex plc 2004 Europe Zetex GmbH Streitfeldstrae 19 D-81673 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 Hwy 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 Headquaters Zetex plc Fields New Road, Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com These offices are supported by agents and distributors in major countries world-wide. This publication is 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. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com PROVISIONAL ISSUE J - APRIL 2004 SEMICONDUCTORS 6 SCZXLD1022DSH |
Price & Availability of ZXCT1022
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