Zetex (Now Diodes) ZXCT1008 Schematic [ru]

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ZXCT1008

AUTOMOTIVE HIGH-SIDE CURRENT MONITOR

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.

APPLICATIONS

Automotive current measurement

DC motor and solenoid control

Over current monitor

Power management

FEATURES

APPLICATION CIRCUIT

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

ORDERING INFORMATION

DEVICE

REEL

TAPE

QUANTITY PER

 

SIZE

WIDTH

REEL

 

 

 

 

ZXCT1008FTA

7”

8mm

3,000 units

 

 

 

 

DEVICE MARKING

108

ISSUE 4 - JULY 2007

1

ZXCT1008

ABSOLUTE MAXIMUM RATINGS

Voltage on any pin

 

-0.6V to 20V (relative to Iout)

Continuous output current, IOUT,

,

10mA

Continuous sense voltage, V

-0.5V to +5V

SENSE

 

-40 to 125°C

Operating temperature, TA,

 

Storage temperature

 

-55 to 150°C

Package power dissipation (TA = 25°C)

450mW Derate to zero at 150°C

Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extented periods, may reduce device reliability.

ELECTRICAL CHARACTERISTICS

Test Conditions TA = 25°C, Vin = 5V, Rout = 100Ω.

SYMBOL

PARAMETER

CONDITIONS

 

LIMITS

 

UNIT

 

 

 

Min

Typ

Max

 

Vin

VCC range

 

2.5

 

20

V

1

Output current

Vsense=0V

1

4

15

µA

Iout

 

 

Vsense=10mV

90

104

120

µA

 

 

Vsense=100mV

0.975

1.0

1.025

mA

 

 

Vsense=200mV

1.95

2.0

2.05

mA

 

 

Vsense=500mV

4.8

5.0

5.2

mA

Sense voltage

 

0

 

500

mV

Vsense

 

 

Isense -

Vsense -

 

 

 

100

nA

 

input current

 

 

 

 

 

 

 

 

 

 

 

 

Acc

Accuracy

Rsense = 0.1Ω

 

 

 

 

 

 

Vsense=200mV

-2.5

 

2.5

%

Gm

Transconductance,

 

 

10000

 

µA/V

 

Iout / Vsense

 

 

 

 

 

BW

Bandwidth

VSENSE(DC) = 10mV, Pin = -40dBm ‡

 

300

 

kHz

 

 

VSENSE(DC) = 100mV, Pin = -20dBm ‡

 

2

 

MH

1 Includes input offset voltage contribution

VSENSE is defined as the differential voltage between VSENSE+ and VSENSE-. VSENSE = VSENSE+ - VSENSE-

=VIN - VLOAD

=ILOAD x RSENSE

-20dBm=63mVp-p into 50Ω

ISSUE 4 - JULY 2007

2

ZXCT1008

TYPICAL CHARACTERISTICS

ISSUE 4 - JULY 2007

3

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