zxct1011 Zetex Semiconductors plc., zxct1011 Datasheet

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zxct1011

Manufacturer Part Number
zxct1011
Description
Zxct1011 - High-side Low Drift Current Monitor
Manufacturer
Zetex Semiconductors plc.
Datasheet
ZXCT1011
High-side low drift current monitor
Description
The ZXCT1011 is a high side current sense monitor. Using this type of device eliminates the need
to disrupt the ground plane when sensing a load current.
The ZXCT1011 takes the voltage developed across a current shunt resistor and translates it into a
proportional output current.
A user defined output resistor scales the output current into a ground referenced voltage.
A current reference resistor, external to the IC, results in an improved temperature coefficient
compared to the ZXCT1009.
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 4uA, combined with its SOT23-5 package
make it suitable for portable battery equipment too.
Features
■ Accurate high-side current sensing
■ 2.5V to 20V supply range
■ 4 µA quiescent current
■ 1% typical accuracy
■ Package SOT23-5
■ Temperature range -40 to 125°C
Typical application circuit
Ordering information
Issue 1- July 2005
© Zetex Semiconductors plc 2005
R
120 Ω
shunt
ZXCT1011E5TA
Vin
Order code
GND
3
V
ZXCT1011
sense+
5
R
2
sense
I
out
Rout
V
SOT23-5
sense-
Pack
4
V
Load
mark
1011
Part
1
inches (mm)
Reel Size
Applications
■ Automotive current measurement
■ Battery management
■ DC motor and solenoid control
■ Over current monitor
■ Power management
Pin connections
7 (180)
R
shunt
N/C
I
out
Tape width
8mm
www.zetex.com
Quantity Per
V
V
3,000
sense+
sense-
reel

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zxct1011 Summary of contents

Page 1

... High-side low drift current monitor Description The ZXCT1011 is a high side current sense monitor. Using this type of device eliminates the need to disrupt the ground plane when sensing a load current. The ZXCT1011 takes the voltage developed across a current shunt resistor and translates it into a proportional output current ...

Page 2

... R = 0.1 sense V = 100mV sense R = 120 shunt - ‡ 10mV sense CL = 5pF out V = 100mV sense CL = 5pF out V = 200mV, R =1k sense out . out 2 ZXCT1011 Min Typ. Max Units 2 µ µA 84 116 124 µA 273 320 330 0.97 1.00 1.03 mA 1.95 2.00 2.05 mA 4.85 5.00 5. 500 ...

Page 3

... Typical characteristics T =25° 120 unless otherwise stated. A shunt Issue 1- July 2005 © Zetex Semiconductors plc 2005 3 ZXCT1011 www.zetex.com ...

Page 4

... Typical characteristics T =25° 120 unless otherwise stated. A shunt Issue 1- July 2005 © Zetex Semiconductors plc 2005 4 ZXCT1011 www.zetex.com ...

Page 5

... The following lines describe how to scale a load current to an output voltage. Defining then since Note embedded into the specification of the ZXCT1011 and therefore appears an offset error. The output current of the ZXCT1011 is directly related to the size of the trimming resistor used important to ensure the tolerance change in output. Consider the following: - Issue 1- July 2005 © ...

Page 6

... R 5 shunt 120R V sense shunt Figure 1 ZXCT1011 to measure a 1.0 A load current To obtain the highest accuracy, choose the of R The transconductance using a 120 Choose R to give V = 3.3V, when V out out Rearranging equation 1 without the offset error gives: Now consider the offset error for this resistor: Issue 1- July 2005 © ...

Page 7

... At low supply voltages and high Vsense measurements, special care must be taken to ensure the correct operation. The circuit in figure 2.0 shows a ZXCT1011 operating from 10V supply rail. The minimum operating voltage of the ZXCT1011 is 2.5V. This allows a maximum output voltage of 7. set resistor on the output would draw a maximum 2.5mA from Iout. - See minimum out usable supply voltage graph on page 4 ...

Page 8

... Zetex Semiconductors plc 3701-04 Metroplaza Tower 1 Zetex Technology Park, Chadderton Hing Fong Road, Kwai Fong Oldham, OL9 9LL Hong Kong United Kingdom Telephone: (852) 26100 611 Telephone (44) 161 622 4444 Fax: (852) 24250 494 Fax: (44) 161 622 4446 asia.sales@zetex.com hq@zetex.com 8 ZXCT1011 www.zetex.com ...

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