ZXCT1041 DIODES | 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 20V 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 the ZXCT1041 particularly 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 2 - January 2008 2 www.zetex.com © Zetex Semiconductors plc 2008 Absolute maximum ratings Voltage on VS- and VS+ -0.6 to 20V Voltage on all other pins -0.6V to (V S+ or VS-) +0.6V Vsense [(VS+) - (VS-)] +/-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 VS± Common-mode sense input range 2.7 20 V Flag Current direction flag output 0 V S± V VSENSE Differential sense input voltage range 0 ±0.8 V VOUT Output voltage range 0 V S± -1.5 V TA Ambient temperature range -40 125 °C Pin Name Description 1F l a g This is the current direction pin. It is open collector and allows the logic high level to be set independent of VS+ voltage. Low indicates VS+ is greater than VS-
2 GND Ground pin
3 OUT Output voltage pin
4 S+ 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 5 S- This is the negative input of the cu rrent monitor. The current through this pin varies with differential sense voltage
Issue 2 - January 2008 3 www.zetex.com © Zetex Semiconductors plc 2008
Electrical characteristics
Test conditions TA = 25°C, VS+ = 10V, VSENSE = 100mV NOTES: (a) VSENSE = "VS+" - "VS-" (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 IS+ VS+ input current V SENSE = 0V 10 17 24 µA IS- VS- 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 % Accuracy Total output error (Gain + offset) VSENSE = -100mV ±5 % BW Bandwidth V SENSE(DC) = 100mV VSENSE(AC) = 63mVPP 300 kHz CMRR V S+ common mode rejection ratio VIN = 2.7 to 20V 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 2 - January 2008 4 www.zetex.com © Zetex Semiconductors plc 2008 Typical characteristics Conditions VSENSE+=10V, VSENSE=100mV, TA=25°C unless otherwise stated.
Issue 2 - January 2008 5 www.zetex.com © Zetex Semiconductors plc 2008 Typical characteristics Conditions VSENSE+=10V, VSENSE=100mV, TA=25°C unless otherwise stated. 100 150 200 250 300 100 200 300 400 500 600 700 100 200 300 400 500 600 700 -15 -10 -10 -5 0 5 10 -150 -100 -50 100 150 VOUT & VFLAG v Sense Voltage Voltage (V) VSENSE (V) FLAG VCC = 5V RFLAG = 50k FLAG VCC = 5V RFLAG = 50k IGND & VFLAG v Sense Voltage VFLAG (V) IGND(µA) VSENSE (V) Flag Current 100µA TA = -40°C to 125°C ISENSE+ v Sense Voltage Sense+ Pin Current (µA) VSENSE (V) TA = -40°C to 125°C ISENSE- v Sense Voltage Sense- Pin Current (µA) VSENSE (V) Error v Resistive Loading Gain Error (%) Output Load Resistance (Ω) Error v Current Loading Output Load Current (µA)) Output Voltage Error (mV)
Issue 2 - January 2008 6 www.zetex.com © Zetex Semiconductors plc 2008 Typical characteristics Conditions VSENSE+=10V, VSENSE=100mV, TA=25°C unless otherwise stated. -5 0 5 10 15 20 25 30 0.0 0.5 1.0 1.5 2.0 -5 0 5 10 15 20 25 30 0.0 0.5 1.0 1.5 2.0 -5 0 5 10 15 20 25 30 35 0.00 0.05 0.10 0.15 0.20 -5 0 5 10 15 20 25 30 35 0.00 0.05 0.10 0.15 0.20 - 4 - 2 02468 1 0 -4 -2 0 2 4 6 8 10 0.0 0.5 1.0 1.5 2.0 VOUT VSENSE Forward Large Signal Step ResponseVoltage (V) Time (µs) VOUT VSENSE Reverse Large Signal Step ResponseVoltage (V) Time (µs) VOUT VSENSE Forward Small Signal Step ResponseVoltage (V) Time (µs) VOUT VSENSE Reverse Small Signal Step ResponseVoltage (V) Time (µs) VFLAG VSENSE X10 Large Sig Zero Crossing ResponseVoltage (V) Time (µs) VOUT Large Sig Zero Crossing Response Time (µs) Voltage (V)
Issue 2 - January 2008 7 www.zetex.com © Zetex Semiconductors plc 2008 Typical characteristics Conditions VSENSE+=10V, VSENSE=100mV, TA=25°C unless otherwise stated. 16 18 20 22 24 26 28 30 16 18 20 22 24 26 28 30 0.0 0.5 1.0 1.5 2.0 -4 -2 0 2 4 6 8 10 12 14 -4 -2 0 2 4 6 8 10 12 14 0.00 0.05 0.10 0.15 0.20 16 18 20 22 24 26 28 30 32 34 16 18 20 22 24 26 28 30 32 34 0.00 0.05 0.10 0.15 0.20 VSENSE X10 VFLAG Large Sig Zero Crossing ResponseVoltage (V) Time (µs) VOUT Large Sig Zero Crossing ResponseVoltage (V) Time (us) VSENSE X100 VFLAG Small Sig Zero Crossing ResponseVOUT (V) Time (µs) VOUT Small Sig Zero Crossing Response VOUT (V) Time (µs) VSENSE X100 VFLAG Small Sig Zero Crossing ResponseVout (V) Time (µs) VOUT Small Sig Zero Crossing Response Time (µs) Vout (V)
Issue 2 - January 2008 8 www.zetex.com © Zetex Semiconductors plc 2008 Typical characteristics Conditions VSENSE+=10V, VSENSE=100mV, TA=25°C unless otherwise stated. 100 1k 10k 100k 1M -10 100 1k 10k 100k 1M -10 100k 1M -25 -20 -15 -10 100k 1M -25 -20 -15 -10 VSENSE=+100mVrms VAC=63mVP-P Forward CMRR Rejection (dB) Frequency (Hz) Vs+=2.7V Vs+=5.0V Vs+=10V Vs+=15V & 20V VSENSE=-100mVrms VAC=63mVP-P Vs+=15V & 20V Vs+=10V Vs+=5.0V Vs+=2.7V Reverse CMRR Rejection (dB) Frequency (Hz) VS+=2.7V VS+=5.0V VS+=10V VS+=15V VS+=20VVSENSE=+100mV VAC=63mVP-P Forward Frequency Response Gain (dB) Frequency (Hz) VS+=2.7V VS+=5.0V VS+=10V VS+=15V VS+=20VVSENSE=-100mV VAC=63mVP-P Reverse Frequency Response Gain (dB) Frequency (Hz)
Issue 2 - January 2008 9 www.zetex.com © Zetex Semiconductors plc 2008
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 0.67mA/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. S+ S- 1.5k 1.5k OUT Flag GND 15k
Issue 2 - January 2008 10 www.zetex.com © Zetex Semiconductors plc 2008 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 V SENSE of the order of 50mV to 150mV. GND OUT Flag S+S- ZXCT1041 Load Battery charger control Battery
Issue 2 - January 2008 11 www.zetex.com © Zetex Semiconductors plc 2008 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 2 - January 2008 12 www.zetex.com © Zetex Semiconductors plc 2008 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 © 2008 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. 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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.