ZXCT1022 ZETEX | Alldatasheet

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Technical content

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 25µA, combined with its SOT23-5 package make it suitable for portable battery equipment too.

FEATURES

  • Accurate high-side current sensing
  • Output voltage scaling
  • 2.5V – 20V supply range
  • 25/H9262A 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 ZXCT1022 PROVISIONAL ISSUE J - APRIL 2004 LOW OFFSET HIGH-SIDE CURRENT MONITOR DEVICE REEL SIZE TAPE WIDTH QUANTITY PER REEL ZXCT1022E5TA 7” 8mm 3,000 units DEVICE MARKING 1022

ORDERING INFORMATION

TYPICAL CIRCUIT APPLICATION

Voltage on any pin -0.6V to 20V Vsense -0.6V to Vin + 0.5V Operating temperature -40 to 85 °C Storage temperature -55 to 150 °C Package power dissipation (T A = 25°C) SOT23 450mW ZXCT1022 SEMICONDUCTORS PROVISIONAL ISSUE J - APRIL 2004 SYMBOL PARAMETER CONDITIONS LIMITS UNIT Min Typ Max Vin VCC range 2.5 20 V Vout Output voltage (ZXCT1022) Vsense =0 V Vsense = 10mV Vsense = 30mV Vsense = 100mV 0.97 2.91 9.7 1.0 3.0 10.0 100 1.03 3.09 10.3 mV V V V R out Output resistance 10 15 20 K /H9024 Tc Output temperature coefficient 50 300 ppm Iq Ground pin current V sense =0 V 2 5 3 5 /H9262A Vsense (2) Sense voltage 0 1.5 V Isense Load pin input current 100 nA Acc Accuracy V sense = 10mV -3 3 % Gain V out /V sense Vsense = 10mV 0.97 1.0 1.03 V BW Bandwidth V sense = 10mV Vsense = 100mV 300 kHz MHz ELECTRICAL CHARACTERISTICS Test Conditions TA = 25°C, Vin = 15V NOTES (2) Vsense= Vin -V load TC Limits are determined by characterization.

PROVISIONAL ISSUE J - APRIL 2004

PROVISIONAL ISSUE J - APRIL 2004 BLOCK DIAGRAM

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: 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 150mΩ using 1 oz copper. Smaller resistances can be used if required. Total circuit solution: 1 component. Shows area of 150m Ω sense resistor compared to SOT23 package. Practical tolerance of the PCB resistor will be around 5% depending on manufacturing methods. ZXCT1022 SEMICONDUCTORS PROVISIONAL ISSUE J - APRIL 2004 Vout = 100 x Vsense (V) GND Load Top view PINOUT PIN NAME PIN FUNCTION N/C Not internally connected GND Ground V out Voltage output referenced to GND. Intended to drive high impedance loads Load High impedance negative sense voltage input V in Supply and positive sense voltage input

PROVISIONAL ISSUE J - APRIL 2004 SCZXLD1022DSH Europe Zetex GmbH Streitfeldstraße 19 D-81673 München 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 © Zetex plc 2004 DIM Millimetres Inches MIN MAX MIN MAX A 0.90 1.45 0.035 0.057 A1 0.00 0.15 0.00 0.006 A2 0.90 1.3 0.035 0.051 b 0.35 0.50 0.014 0.020 C 0.09 0.20 0.0035 0.008 D 2.80 3.00 0.110 0.118 E 2.60 3.00 0.102 0.118 E1 1.50 1.75 0.059 0.069 e 0.95 REF 0.037 REF e1 1.90 REF 0.075 REF L 0.10 0.60 0.004 0.024 a °01 001 0 PACKAGE DIMENSIONSPACKAGE DIMENSIONS SOT23-5