ZETEX ZXCT1009 Technical data

HIGH-SIDE CURRENT MONITOR

ZXCT1009

DESCRIPTION

The ZXCT1009 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 definedoutput 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. A
minimum operating current of just4␮A,combinedwith
its SOT23 package make it a unique solution for
portable battery equipment.

FEATURES

Low cost, accurate high-side current sensing

•

Output voltage scaling

•

•

Up to 2.5V sense voltage

•

2.5V – 20V supply range

•

4µA quiescent current

•

1% typical accuracy

•

SOT23 and SM8 packages

APPLICATIONS

Battery chargers

•

Smart battery packs

•

DC motor control

•

Over current monitor

•

Power management

•

Level translating

•

Programmable current source

•

APPLICATION CIRCUIT

ORDERING INFORMATION

DEVICE REEL

ZXCT1009FTA 7” 8mm 3,000 units 109 SOT23

ZXCT1009T8TA 7” 12mm 1,000 units ZXCT1009 SM8

ISSUE 9 - OCTOBER 2005

SIZE

TAPE

WIDTH

QUANTITY PER

REEL

1

PARTMARKING PACKAGE

SEMICONDUCTORS

ZXCT1009

ABSOLUTE MAXIMUM RATINGS

Voltage on any pin -0.6V to 20V (relative to I
Continuous output current 25mA
Continuous sense voltage V

in

+ 0.5V > V

sense

†

Operating temperature -40 to 85°C
Storage temperature -55 to 125°C

Package power dissipation (T

= 25°C)

A

SOT23 450mW - derate to zero at 125°C
SM8 2W

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

ELECTRICAL CHARACTERISTICS

Test Conditions TA= 25°C, Vin= 5V, R

SYMBOL PARAMETER CONDITIONS LIMITS UNIT

V

in

1

I

out

V

sense

I

sense

Acc Accuracy

Gm Transconductance,

BW Bandwidth RF Pin= -20dBm‡

1

Includes input offset voltage contribution

†

V

sense=Vin-Vload

‡ -20dBm=63mVp-p into 50Ω

VCCrange 2.5 20 V

Output current V

†

Sense voltage 0 2500 mV

-V

input current

I

-

sense

out/Vsense

out

V

V

V

V

R

V

V

V

= 100Ω.

sense

sense

sense

sense

sense

sense

sense

sense

sense

=0V

=10mV

=100mV

=200mV

=1V

=0.1Ω

=200mV

= 10mV dc

= 100mV dc

Min Typ Max

1

90

0.975

1.95

9.6

-2.5 2.5 %

)

out

> Vin– 5V

4

104

1.002

2.0

9.98

10000 µA/V

300

2

15

120

1.025

2.05

10.2

100 nA

µA

µA

mA

mA

mA

kHz

MHz

SEMICONDUCTORS

ISSUE 9 - OCTOBER 2005

2

TYPICAL CHARACTERISTICS

ZXCT1009

10m

VIN=5V
Tamb = 25°C
R

=0

W

OUT

1m

100µ

- Output Current (A)

10µ

OUT

I

100µ 1m 10m 100m 1

V

SENSE

(V)

Typical Output v Sense Voltage

10.2

10.0

9.8

9.6

- Output Current (mA)

OUT

I

9.4

-40-20 0 20406080

Temperature (°C)

VIN=5V
V

SENSE

R

=0

OUT

Output Current v Temperature

=1V

W

Output Current Error (%)

5

4

3

2

1

0

-1

Typical

-2
10m 100m 1

V

SENSE

(V)

VIN=5V
Tamb = 25°C
R

OUT

Error v Sense Voltage

3

VIN=5V,Tamb=25°C,RFPIN=-20dBm

0

-3

DC V

-6

Gain (dB)

-9

-12

0.01 0.1 1 10

DC V

SENSE

SENSE

DC V

=0.01V

=0.1V

SENSE

=1V

Frequency (MHz)

Frequency Response

=0

W

12

VIN=5V

10

Tamb = 25°C
R

=0

W

OUT

8

6

4

- Output Current (mA)

2

OUT

I

0

012345

VIN- Supply Voltage (V)

Transfer Characteristic

ISSUE 9 - OCTOBER 2005

V

SENSE

V

SENSE

V

SENSE

V

SENSE

V

SENSE

=1V

=0.8V

=0.6V

=0.4V

=0.2V

0

VIN=5V

-10

Tamb = 25°C

-20

RF PIN= -20dBm

-30

-40

-50

V

=0.01V

SENSE

1 10 100 1k 10k 100k 1M 10M

Rejection (dB)

-60

-70

-80

-90

V

SENSE

V

SENSE

=0.1V

=1V

Frequency (Hz)

Common Mode Rejection

3

SEMICONDUCTORS