Zetex (Now Diodes) ZXCT1008 Schematic [ru]

AUTOMOTIVE HIGH-SIDE CURRENT MONITOR

ZXCT1008

DESCRIPTION

The ZXCT1008 is a high side current sense monitor.
Using this device eliminates the need to disrupt the
ground plane when sensing a load current.

It takes a high side 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.

The wide input voltage range of 20V down to as low as

2.5V make it suitable for a range of applications. The
ability to withstand high voltage transients and
reverse polarity connection, makes this part very
suitable for automotive and other transient rich
environments.

FEATURES

Low cost, accurate high-side current sensing

•

-40 to +125°C temperature range

•

•

Up to 500mV sense voltage

•

2.5V – 20V supply range

•

4µA quiescent current

•

1% typical accuracy

•

SOT23

APPLICATIONS

Automotive current measurement

•

DC motor and solenoid control

•

Over current monitor

•

Power management

•

APPLICATION CIRCUIT

ORDERING INFORMATION

DEVICE REEL

ZXCT1008FTA 7” 8mm 3,000 units

SIZE

TAPE

WIDTH

QUANTITY PER

DEVICE MARKING

•

108

ISSUE 4 - JULY 2007

REEL

1

ZXCT1008

ABSOLUTE MAXIMUM RATINGS

Voltage on any pin -0.6V to 20V (relative to I
Continuous output current, I

Continuous sense voltage, V
Operating temperature, T

, 10mA

OUT

†

, -0.5V to +5V

SENSE

,

A

-40 to 125°C

Storage temperature -55 to 150°C

Package power dissipation (T

Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum

ratings, for extented periods, may reduce device reliability.

= 25°C) 450mW Derate to zero at 150°C

A

ELECTRICAL CHARACTERISTICS

Test Conditions TA= 25°C, Vin= 5V, R

SYMBOL PARAMETER CONDITIONS LIMITS UNIT

V

in

I

out

V

sense

I

sense

1

VCCrange 2.5 20 V

Output current V

†

Sense voltage 0 500 mV

-V

sense

-

input current

Acc Accuracy

Gm Transconductance,

I

out/Vsense

BW Bandwidth V

1

Includes input offset voltage contribution

†

V

is defined as the differential voltage between V

SENSE

V

‡ -20dBm=63mVp-p into 50Ω

SENSE

= V

SENSE+

= VIN- V
= I

LOAD

LOAD

x R

- V

SENSE-

SENSE

out

sense

V

sense

V

sense

V

sense

V

sense

R

sense

V

sense

SENSE(DC)

V

SENSE(DC)

= 100Ω.

=0V

=10mV

=100mV

=200mV

=500mV

=0.1Ω

=200mV

= 10mV, Pin = -40dBm ‡

= 100mV, Pin = -20dBm ‡

SENSE+

and V

)

out

Min Typ Max

1

90

0.975

1.95

4.8

4

104

1.0

2.0

5.0

-2.5 2.5 %

10000 µA /V

300

2

.

SENSE-

15

120

1.025

2.05

5.2

µA

µA

mA

mA

mA

100 nA

kHz

MH

ISSUE 4 - JULY 2007

2

TYPICAL CHARACTERISTICS

ZXCT1008

ISSUE 4 - JULY 2007

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