zxct1020 Zetex Semiconductors plc., zxct1020 Datasheet

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zxct1020

Manufacturer Part Number
zxct1020
Description
Zxct1020 - Precision Current Output Monitor
Manufacturer
Zetex Semiconductors plc.
Datasheet

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Part Number:
zxct1020E5TA
Quantity:
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ZXCT1020
Low offset current output current monitor
Description
The ZXCT1020 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 ZXCT1020 uses two external resistors to
set the overall voltage gain for applications
where improved accuracy at small sense
voltages is required. For fixed gain variants
Zetex offers the ZXCT1021 (G=10) and
ZXCT1022 (G=100).
The ZXCT1020 footprint follows that of the
ZXCT1021/2 with only 2 additional resistors
required:
One resistor between pins 1 and 4 for setting
transconductance, and the other between
pins 3 and 2 for setting overall gain.
Features
Pinout information
Ordering information
Issue 1 - August 2007
© Zetex Semiconductors plc 2007
Order reference
ZXCT1020E5TA
Accurate high-side current sensing
Versatile current output scaling
2.5V - 20V operating range
25µA quiescent current
1% typical accuracy
SOT23-5 package
GND
OUT
S+
1
2
3
Top view
SOT23-5
Package
5
4
S-
V
B
marking
Device
1020
1
Preview
Current output enables the user to set the gain
via these external resistors. Using two external
resistors to set the gain ensures optimal
versatility as the transconductance can be varied
to meet the output impedance requirements of
the load that the ZXCT1020 has to drive.
The very low offset voltage enables a typical
accuracy of 3% for sense voltages of only 10mV,
giving
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.
Applications
Typical application circuit
R
V
Status
R
OUT
SH
Battery chargers
Over-current monitor
Motherboard power supply current measurement
Level translating
Programmable current source
G
S+
better
1
3
Reel size
(inches)
7
tolerances
V
B
4
2
ZXCT1020
GND
Quantity
+
per reel
R
-
3000
S
for
ZXCT1020
www.zetex.com
S-
(LOAD)
5
small
I
L
Tape width
(mm)
8
sense

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zxct1020 Summary of contents

Page 1

... Using two external resistors to set the gain ensures optimal versatility as the transconductance can be varied to meet the output impedance requirements of the load that the ZXCT1020 has to drive. The very low offset voltage enables a typical accuracy of 3% for sense voltages of only 10mV, giving better resistors necessary at higher currents ...

Page 2

... Zetex Semiconductors plc 2007 = 25°C) SOT23-5 amb . B not being exceeded. SENSE the order of 150 placed on out will set the ZXCT1020 output impedance equal G (*) should be referred to the rail whose current is being measured SHUNT GAIN 1.5k 15k 750 15k 300 ...

Page 3

... SENSE SENSE SENSE V = 100mV SENSE V = 100mV SENSE R not connected G V (DC) = 10mV SENSE V (DC) = 100mV SENSE 2.5 to 20V SENSE ZXCT1020 = 1.5k unless otherwise stated. SH Limits Min. Typ. Max 291 300 309 0.98 1 1.02 V 1.47 1.5 1. 300 100 100 - 370 ...

Page 4

... Typical characteristics Test conditions unless otherwise stated 1. 15k . SH G Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25° SENSE+ Supply current v Temperature 4 ZXCT1020 (via R ) =15V 100mV SH SENSE www.zetex.com ...

Page 5

... Test conditions unless otherwise stated: T Gain = 10 15k . G ° ° Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25° SENSE+ ° ° ° ° ° ° ° ° 5 ZXCT1020 (via R ) =15V 100mV SH SENSE ° ° ° ° ° www.zetex.com ...

Page 6

... Test conditions unless otherwise stated: T Gain = 20 15k . G ° Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25° SENSE+ ° ° ° ° ° ° ° ° 6 ZXCT1020 (via R ) =15V 100mV SH SENSE ° ° ° ° ° ° ° www.zetex.com ...

Page 7

... Test conditions unless otherwise stated 15k . G Gain = 100 ° ° ° Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25° (via SENSE+ ° ° ° 7 ZXCT1020 ) =15V 100mV SH SENSE ° 10mV SENSE www.zetex.com ...

Page 8

... Typical AC characteristics Test conditions unless otherwise stated 15k . G Gain = 10 Gain = 50 Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25° (via SENSE+ 8 ZXCT1020 ) =15V 100mV, SH SENSE www.zetex.com ...

Page 9

... Test conditions unless otherwise stated 100mV unless otherwise stated. SENSE Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25°C, R =15k Various gains with constant R 9 ZXCT1020 = V (via R ) =15V, B SENSE www.zetex.com ...

Page 10

... Test conditions unless otherwise stated 100mV. SENSE Issue 1 - August 2007 © Zetex Semiconductors plc 2007 = 25°C, G=100 15k ZXCT1020 = V (via SENSE+ SH www.zetex.com ...

Page 11

... The ZXCT1020 has a V pin that is used to provide power to the current monitor. The maximum B voltage applied to the ZXCT1020 must be applied to this pin. The S+ and S- pins are used to measure the current flowing to the load through the sense resistor. In normal use, the S+ is tied to V ...

Page 12

... Issue 1 - August 2007 © Zetex Semiconductors plc 2007 Intentionally left blank 12 ZXCT1020 www.zetex.com ...

Page 13

... Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches Issue 1 - August 2007 © Zetex Semiconductors plc 2007 Millimeters Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 0.95 REF 1.90 REF 0.60 30° 13 ZXCT1020 Inches Min. Max. 0.0354 0.0570 0.00 0.0059 0.0354 0.0511 0.0078 0.0196 0.0035 0.0102 0.1062 0.1220 0.0866 0.1181 0.0511 ...

Page 14

... 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 14 ZXCT1020 www.zetex.com ...

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