ZXCT1023 DIODES | Alldatasheet

Document overview

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Technical content

Features

  • Accurate high-side current sensing
  • Fixed gain of 50 output scaling
  • 2.5V – 20V operating range
  • 3.5µA quiescent current
  • TDFN1218 package

Applications

  • Battery capacity measurement
  • Battery chargers
  • Over-current monitor Pin Connections TDFN1218-4L Typical Operating Circuit S+ S- GND VOUT RG RGT RS OUT GND Top View

MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR ZXCT1023 2 of 6 MARCH 2009 Document Rev. 1 www.diodes.com ©Diodes Incorporated A Product Line of Diodes Incorporated Absolute maximum ratings VSENSE Package power dissipation (T A = 25ºC) These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability Notes 1. Measured with respect to GND pin 2. Subject to absolute maximum V SENSE not being exceeded. 3. V SENSE is defined as the voltage difference across the sense resistor, RS. 4. The usable V SENSE range is limited by the output voltage range; and as such will be reduced at lower VS+ values. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. ESD ratings: Recommended operating conditions Parameter MIN MAX Units VS+ 1, Common-mode sense input range 2.5 20 V VSENSE, Differential Sense Input voltage range 0 380 4 mV VOUT,O u t p u t V o l t age range 0 V S- -1 V TA, Ambient temperature range -40 85 °C

Electrical characteristics

TA = 25°C, VS+ = 3.6V, VSENSE = 50mV, unless otherwise stated Symbol Parameter Conditions Limits Unit Min. Typ. Max. VOUT Output voltage VSENSE = 0mV 0.3 50 mV VSENSE = 10mV 425 500 575 VSENSE = 30mV 1.41 1.5 1.59 V VSENSE = 50mV 2.425 2.5 2.575 VSENSE = 100mV, VS+ = 20V 4.85 5 5.15 TC5 Output voltage temperature coefficient 50 300 ppm IQ Ground pin current V SENSE = 0V 3.5 8 μA IS- SENSE- input current V SENSE = 0V 100 nA Acc Accuracy V SENSE = 50mV -3 3 % Gain V OUT/VSENSE V SENSE = 50mV 50 V/V ROUT Output resistance 15 k Ω BW Bandwidth VSENSE (DC) = 10mV 300 kHz VSENSE (DC) = 50mV 1 MHz PSRR6 Power supply rejection ratio VSENSE = 30mV, VS+ = 2.5 to 20V 50 60 dB Notes 5. TC limits are determined by characterization. 6. PSRR is defined as change in output voltage per change in S+ voltage, V S+.

MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR ZXCT1023 3 of 6 MARCH 2009 Document Rev. 1 www.diodes.com ©Diodes Incorporated A Product Line of Diodes Incorporated Typical DC characteristics VSENSE = 0V, VS+ = 3.6V 0.5 1.5 2.5 2 4 6 8 10 12 14 16 18 20 VS+ (V) IS+ (µA) TA = -40°C TA = 0°C TA = 85°C Vs+ = 3.6v Relative to gain = 50 -2% -1% 0 1 02 03 04 05 0 VSENSE (mV) Differential Gain Error TA = 85°C TA = -40°C TA = 0°C TA = 25°C S+ input current vs Supply voltage Normalised gain error Vs Sense voltage VS+ = 3.6V -40°C 25°C 85°C 02468 1 0 VSENSE (mV) Differential Gain (ΔVOUT/ΔVSENSE) TA = 0°C VS+ = 3.6V 0.5 1.5 2.5 3.5 0 1 02 03 04 05 06 0 VSENSE (mV) VOUT (V) TA = 85°C TA = 25°C TA = 0°C TA = -40°C Differential gain Vs Sense voltage Output Voltage Vs Sense voltage TA = 25°C VSENSE = 10mV VSENSE = 30mV VSENSE = 50mV 0.5 1.5 2.5 2 4 6 8 10 12 14 16 18 20 VS+ (V) VOUT (V) VS+ =3.6V w.r.t. VOUT at 25°C VSENSE = 10mV, 30mV, 50mV10mV 30mV 30mV50mV 50mV -0.6% -0.4% -0.2% 0.0% 0.2% 0.4% 0.6% -40 -15 10 35 60 85 Temperature (°C) ΔVOUT %Error Output voltage VS+ Input voltage Relative output voltage change Vs Temperature

MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR ZXCT1023 4 of 6 MARCH 2009 Document Rev. 1 www.diodes.com ©Diodes Incorporated A Product Line of Diodes Incorporated Typical AC characteristics -20 -10 10E+0 100E+0 1E+3 10E+3 100E+3 1E+6 10E+6 frequency (Hz) Gain (dB) VSENSE = 50mV VSENSE = 10mV VS+=3.6V TA =25°C TA = 25°C VSENSE = 50mV 0.01 0.1 1 10 100 1000 Frequency (kHz) PSRR (dB) VS+ = 10V VS+ = Small signal frequency response Power supply rejection ratio 0 50 100 150 200 250 300 Time (µs) Input (mV) -0.2 0.2 0.4 0.6 0.8 1.2 Output (V) Input Output VS+=3.6V, TA = 25°C VSENSE = 20mV -10 0 50 100 150 200 Time (µs) Input (mV) -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Output (V) Input Output VS+=3.6V, TA = 25°C VSENSE = 50mV l Large signal pulse response 20mV Large signal pulse response 50mV 0 50 100 150 200 time (µs) Sense voltage (mV) 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 Output voltage (V) Input Output VS+=3.6V, TA =25°C VSENSE = 50mV(DC) + 5mV 0 25 50 75 100 125 150 time (µs) VSENSE (mV) 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 VOUT (V)Input Output VS+=3.6V, TA =25°C VSENSE = 50mV(DC) - 5mV pulse Small signal positive pulse response Small signal negative pulse response Pin out information Package Name Pin function

1 OUT

Voltage output. The output voltage is referenced to GND. The overall voltage gain of V OUT = 50 x VSENSE where VSENSE = VS+ - VS- 2 GND Ground and substrate connection of device. NC No connection

3 S- High impedance negative sense voltage input

4 S+ Positive sense input. Also acts as power supply pin to ZXCT1023

MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR ZXCT1023 5 of 6 MARCH 2009 Document Rev. 1 www.diodes.com ©Diodes Incorporated A Product Line of Diodes Incorporated

Application information

The ZXCT1023 is line powered (derives its power from the rail being sensed) this reduces the number of pins used and PCB trace routing. The fixed gain of 50 reduces the PCB area by reducing the number of external components. The only external component required is the sense resistor. This coupled with the 1.2mm x 1.8mm TDFN package makes the solution size very small. The fixed gain of 50 has been chosen to meet the normal requirements of most applications. The ZXCT1023 has its gain setting resistor, R G, set at 15k Ω which further reduces power consumption at larger VSENSE. Application Examples Please refer to Zetex AN39 for sample applications. Package Outline TDFN1812-4 package S+ S- GND VOUT RG RGT RS

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