Diodes ZXCT1009 User Manual

Description

ZXCT1009

HIGH-SIDE CURRENT MONITOR

Pin Assignments

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 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. A minimum
operating current of just 4µA, combined with a SOT23
package make it a unique solution for portable battery
equipment. The SM8 device offers an alternative package
option.

Features

• Low cost, accurate high-side current sensing

• Output voltage scaling

• Up to 2.5V sense voltage

• 2.5V to 20V supply range

• 4A quiescent current

• 1% typical accuracy

• SOT23 and SM8 packages

• AEC-Q100.3 qualified; ZXCT1009FTA only

Applications

Package Suffix - F

3V

SENSE-

SENSE-

V

V

SENSE+

SENSE+

3V

2

2

(Top View)

(Top View)

Package Suffix – T8

V

V

SENSE-

SENSE-

V

V

SENSE+

SENSE+

N/C

N/C

I

I

OUT

OUT

1

1
2

2
3

3
4

4

(Top View)

(Top View)

SOT23

SM8

I

I

1

1

OUT

OUT

N/C

8

N/C

8
7

N/C

7

N/C
N/C

N/C

6

6

N/C

5

N/C

5

• Battery chargers

• Smart battery packs

• DC motor control

• Over current monitor

• Power management

• Level translating

• Programmable current source

•

Application Circuit

R

R

SENSE

V

V

IN

IN

SENSE

To load

To load

2

2

V

V

SENSE+

SENSE+

ZXCT1009

ZXCT1009

3

3

V

V

SENSE-

SENSE-

I

I

OUT

OUT

1

1

V

V

OUT

OUT

R

R

OUT

OUT

ZXCT1009

Document number: DS33441 Rev. 12 - 2

1 of 8

www.diodes.com

April 2011

© Diodes Incorporated

ZXCT1009

Pin Descriptions

Pin Name Pin Function

V

V

Absolute Maximum Ratings (T

Voltage on any pin (relative to I
Continous output current, I
Continuous sense voltage, V
Operating temperature, TA
Storage temperature -55 to 125 °C

Package power
dissipation @ TA = 25°C

(Derate to zero @ 125°C)

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 (T

Symbol Parameter Conditions

VIN VCC range

I

OUT

V

SENSE

I

SENSE-

ACC

SENSE+

SENSE-

I

OUT

Connection to supply voltage
Connection to load
Output current, proportional to measured current

= 25°C)

A

Description Rating Unit

-0.6 to 20
25 mA

-0.5 to +5 V

OUT

)

OUT

SENSE

†

-40 to 85 °C

SOT23

450

SM8 2 W

= 25°C, VIN = 5V, R

A

= 100Ω)

OUT

2.5
V

= 0V

SENSE

= 10mV

V

1

Output Current

†

Sense Voltage 0 2500 mV
V
Input Current

SENSE -

Accuracy

SENSE

= 100mV

V

SENSE

= 200mV

V

SENSE

= 1V

V

SENSE

100 nA

SENSE

SENSE

= 0.1

= 200mV

R

V

HIGH-SIDE CURRENT MONITOR

V

mW

Limits

Min Typ Max

1

90

0.975

1.95

9.6

-2.5

4

104

1.002

2.0

9.98

20 V
15

120

1.025

2.05

10.2

2.5

Units

µA

µA
mA
mA
mA

%

GM

BW Bandwidth

Notes: 1. Includes input offset voltage contribution
†. V
V
= VIN - V
= I
‡ -20dBm=63mVPP into 50

Transconductance,
I

OUT/VSENSE

SENSE
SENSE

is defined as the differential voltage between V
= V

SENSE+

LOAD

x R

LOAD

SENSE

10000 µA/V

V

SENSE(DC)

V

SENSE(DC)

- V

SENSE-

ZXCT1009

Document number: DS33441 Rev. 12 - 2

= 10mv, RF PIN = -40dBm

‡

= 100mv, RF PIN = -20dBm‡

and V

SENSE+

www.diodes.com

SENSE-

2 of 8

300

2

kHz

MHz

.

April 2011

© Diodes Incorporated

Typical Characteristics

ZXCT1009

HIGH-SIDE CURRENT MONITOR

ZXCT1009

Document number: DS33441 Rev. 12 - 2

3 of 8

www.diodes.com

April 2011

© Diodes Incorporated