ZXCT1030 ZETEX | Alldatasheet

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Technical content

DESCRIPTION

The ZXCT1030 is a high side current sense monitor containing an internal reference and comparator with a non-latching output. Using this device eliminates the need to disrupt the ground plane when sensing a load current. The wide input voltage range of 20V down to as low as 2.2V make it suitable for a range of applications. Dynamics and supply current are optimised for the processing of fast pulses, associated with switch mode applications.

FEATURES

  • Low cost, accurate high-side current sensing.
  • Output voltage scaling.
  • Up to 18V output.
  • 2.2V – 20V supply range.
  • 270/H9262A quiescent current.
  • 1.5% typical accuracy.
  • MSOP8 Package.
  • Voltage reference on chip
  • Comparator on chip DEVICE MARKING
  • ZXCT 1030

APPLICATIONS

  • Battery chargers
  • Electronic fuse
  • DC motor control
  • Over current monitor
  • Power management
  • Inrush current limiting ZXCT1030 PROVISIONAL ISSUE J - MAY 2004 HIGH-SIDE CURRENT MONITOR WITH COMPARATOR -Comp_in Vout Comp_out To loadRsenseVin sense+ sense- Current Monitor Rcomp 5V Vcomp_supply ZXCT1030 Vcc Vref_out FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

Device Reel size Tape width Quantity per reel ZXCT1030X8TA 7” 12mm 500 units ZXCT1030X8TC 13” 12mm 2500 units

Voltage on any pin -0.6V and V cc +0.6V Operating Temperature -40 to 85 °C Storage Temperature -55 to 125 °C Package Power Dissipation (T A = 25°C) MSOP8 500mW ZXCT1030 SEMICONDUCTORS PROVISIONAL ISSUE J - MAY 2004 SYMBOL PARAMETER CONDITIONS LIMITS UNIT Min Typ Max VCC VCC Range 2.2 20 V Vsense+ Sense+ range 2.2 V CC Vout Output Voltage V sense =0 V Vsense = 10mV Vsense = 30mV Vsense = 50mV Vsense = 100mV Vsense = 500mV 284 480 970 4500 100 300 500 1000 5000 112 316 520 1030 5500 mV mV mV mV mV mV R out Output resistance V sense- = 15V, Vout =1 V 1.2 1.5 1.8 K /H9024 Vout TC Vout temperature coefficient 30 ppm/ /H11034C ICC Supply current V sense- = 15V 170 270 350 µA Isense+ Sense+ input current 25 48 90 µA Isense- Sense- input current V sense- = 14.9V 25 70 220 nA Vsense

2 Sense Voltage 0 500 mV

3 Common Mode Range V cc = 15V

Vcomp_supply =5 V Vcomp_in =V ref Vsense = 10mV 2.8 V Acc Accuracy V sense = 100mV -3 3 % Gain V out /V sense Vsense = 100mV 9.7 10.0 10.3 BW Bandwidth V sense = 10mVp-p Vsense = 100mVp-p MHz MHz ELECTRICAL CHARACTERISTICS Test Conditions TA = 25°C, Vin = Vcc = 15V

2 Vsense = (Vsense +) - (Vsense -)

3Level of Vin where comparator output defaults to ‘off’.

Voltage on any pin -0.6V and V cc +0.6 V Operating Temperature -40 to 85 °C Storage Temperature -55 to 125 °C Package Power Dissipation (T A = 25°C) MSOP8 500mW ZXCT1030 SEMICONDUCTORS PROVISIONAL ISSUE J - MAY 2004 SYMBOL PARAMETER CONDITIONS LIMITS UNIT Min Typ Max Comparator Vcomp Input Voltage 0.005 10 V V H Hysteresis V comp_supply =5 V Rcomp = 10k 15 mV IB Input Bias V comp_supply =5 V Vcomp- in =1 V Rcomp = 10k 5 50 100 nA TD Propagation Delay V comp_supply =5 V Rcomp = 10k 100 ns VOL Output Voltage Low V comp_supply =5 V Rcomp = 10k 30 150 200 mV VOH Output Voltage High V comp_supply =5 V Rcomp = 10k Vcomp_ supply V IOL Output Sink Current V OL = 0.4V 2 mA IOH Output High Leakage Current Vcomp_supply =5 V Rcomp = 10K 1.0 µA Voltage Reference Vref Reference Current =0 /H9262A Reference Current = -300 /H9262A Reference Current =+ 5 /H9262A 1.200 1.200 1.200 1.240 1.240 1.240 1.280 1.280 1.280 V V V delta V ref Change in Vref Isource 5 /H9262At o Isink 300 /H9262A 10 mV TC 30 ppm/ /H11034C PSR Supply rejection 0.01 %/V ELECTRICAL CHARACTERISTICS (Cont.) Test Conditions TA = 25°C, Vin = Vcc = 15V

PROVISIONAL ISSUE J - MAY 2004 TYPICAL CHARACTERISTICS

Voltage output Current Monitor Referring to the block diagram, the current monitor takes the small voltage developed across the sense resistor (Vsense) and transfers it from the large common mode supply voltage to a ground-referenced signal with a gain of 10. The sense input common mode range is 2.2V to 20V. In this range, a linear output voltage is delivered. Reference The bandgap reference allows the comparator to compare the translated Vsense with threshold value chosen by the user which can be any voltage from 0 to 1.24V, configured by two external resistors which forms Vcomp_in. The output current which can be drawn from the comparator reference (I ref source) is limited to 5 µA, making potentiometers ≥ 250k/H9024suitable for setting a threshold level. Where a lower potentiometer resistor value is used, an additional resistor value should be inserted between V ref and V cc to maintain sufficient current for the reference. (as shown in figure 1.0). The Voltage reference has a maximum current sink capability. This magnitude of current will be influenced by the value of R 1 which is inserted between Vref and Vcc. The value of current flowing through R 1 can be expressed as: I = (Vcc -Vref) / R1 Comparator The open collector output is active low and is asserted when Vsense x 10 (Vout) > Vcomp_in. It can be connected to any voltage rail up to Vin via a pull-up resistor. Suggest values for the resistor are in the range of 10-100k/H9024. In the case where high load currents or a short circuit occurs, thus reducing the common mode signals (V+, V-) typically below 2.2V, the comparator will default to the asserted state. This can eliminate a closed loop system ‘latch-up’ condition, allowing the controller to remove the applied power. Stability To ensure stable operation of the ZXCT1030, it is recommended a decoupling capacitor is placed across the V CC and ground connections. A ceramic 10 /H9262F will be adequate. Pin Name Pin Function Vcc Supply voltage Sense- Negative sense input Sense+ Positive sense input GND Ground Comp_in Comparator input, usually a ratio of the reference or other control signal. Vref_out Reference output Vout Current Monitor output voltage Comp_out Open collector comparator output ZXCT1030 SEMICONDUCTORS PROVISIONAL ISSUE J - MAY 2004 Vcc Sense- Sense+ GND Comp_out Vout Vref_out Comp_in PIN CONNECTIONS MSOP8 FIGURE 1.0 External resistor for reference level

PROVISIONAL ISSUE J - MAY 2004 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 Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL 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 Semiconductors plc 2004 H E D eX6 A A LC 1 234 5678 θ B PACKAGE DIMENSIONS PAD LAYOUT DETAILS DIM Millimetres Inches MIN MAX MIN MAX A - 1.10 - 0.043 A1 0.05 0.15 0.002 0.006 B 0.25 0.40 0.010 0.016 C 0.13 0.23 0.005 0.009 D 2.90 3.10 0.114 0.122 e 0.65 BSC 0.0256 BSC E 2.90 3.10 0.114 0.122 H 4.90 BSC 0.193 BSC L 0.40 0.70 0.016 0.028 ° 0 ° 6 °0 °6 ° PACKAGE DIMENSIONS