Diodes ZXCT1020 User Manual download pdf

ZXCT1020

Issue 1 - August 2007 1 www.zetex.com

ZXCT1020

Low offset current output current monitor

Description

Ordering information

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.

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 better tolerances for small sense

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.

Features

• Accurate high-side current sensing

• Versatile current output scaling

• 2.5V - 20V operating range

• 25µA quiescent current

• 1% typical accuracy

• SOT23-5 package

Applications

• Battery chargers

• Over-current monitor

• Motherboard power supply current measurement

• Level translating

• Programmable current source

Pinout information Typical application circuit

Order reference Package Device

marking

Status Reel size

(inches)

Quantity

per reel

Tape width

(mm)

ZXCT1020E5TA SOT23-5 1020 Preview 7 3000 8

S+

GND

OUT

S-

Top view

S+

S-

(LOAD)

GND

OUT

ZXCT1020

1 2 3 4 5 6 ... 13 14

ZXCT1020 1

Summary of Contents

Page 1 - ZXCT1020

ZXCT1020Issue 1 - August 2007 1 www.zetex.com© Zetex Semiconductors plc 2007ZXCT1020Low offset current output current monitorDescriptionOrdering infor

Page 2

ZXCT1020Issue 1 - August 2007 10 www.zetex.com© Zetex Semiconductors plc 2007Test conditions unless otherwise stated: TA = 25°C, G=100, RG = 15k, VB =

Page 3

ZXCT1020Issue 1 - August 2007 11 www.zetex.com© Zetex Semiconductors plc 2007Application informationThe ZXCT1020 has a VB pin that is used to provide

Page 4

Page 5

ZXCT1020Issue 1 - August 2007 13 www.zetex.com© Zetex Semiconductors plc 2007Package outline - SOT23-5Note: Controlling dimensions are in millimeters.

Page 6

ZXCT1020Issue 1 - August 2007 14 www.zetex.com© Zetex Semiconductors plc 2007Zetex sales officesEuropeZetex GmbHKustermannparkBalanstraße 59D-81541 Mü

Page 7

ZXCT1020Issue 1 - August 2007 2 www.zetex.com© Zetex Semiconductors plc 2007Absolute maximum ratingsNOTES:(a) Subject to VSENSE+ never going 6V below

Page 8

ZXCT1020Issue 1 - August 2007 3 www.zetex.com© Zetex Semiconductors plc 2007Electrical characteristics Tamb = 25°C, VSENSE+ = VB = 15V, VSENSE = 100mV

Page 9

ZXCT1020Issue 1 - August 2007 4 www.zetex.com© Zetex Semiconductors plc 2007Typical characteristicsTest conditions unless otherwise stated: TA = 25°C,

Page 10

ZXCT1020Issue 1 - August 2007 5 www.zetex.com© Zetex Semiconductors plc 2007Test conditions unless otherwise stated: TA = 25°C, VB = VSENSE+ (via RSH)

Page 11

ZXCT1020Issue 1 - August 2007 6 www.zetex.com© Zetex Semiconductors plc 2007Test conditions unless otherwise stated: TA = 25°C, VB = VSENSE+ (via RSH)

Page 12

ZXCT1020Issue 1 - August 2007 7 www.zetex.com© Zetex Semiconductors plc 2007Test conditions unless otherwise stated: TA = 25°C, VB = VSENSE+ (via RSH)

Page 13

ZXCT1020Issue 1 - August 2007 8 www.zetex.com© Zetex Semiconductors plc 2007Typical AC characteristicsTest conditions unless otherwise stated: TA = 25

Page 14

ZXCT1020Issue 1 - August 2007 9 www.zetex.com© Zetex Semiconductors plc 2007Test conditions unless otherwise stated: TA = 25°C, RG=15k, VB = VSENSE+ (

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