Diodes ZXCT1107, ZXCT1109, ZXCT1110 User Manual

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LOW POWER HIGH-SIDE CURRENT MONITORS

Description

The ZXCT1107/09/10 are high side unipolar current sen se monitors. These devices eliminate the need to disrupt the ground plane when sensing a load current.

The wide common-mode input voltage range and low quiescent current coupled with SOT23 packages make them suitable for a range of applications; including adapters, automotive and systems operating from industrial 24V rails.

The device is line powered and as such doesn’t need a separate supply rail.

Quiescent current is only 3µA thereby minimising current sensing error. One external gain setting resistor increases versatility by permitting wide gain ranges.

Features

• Wide supply and common-mode voltage range:

2.5V to 36V

• SOT23 packages

o 3-pin ZXCT1107/09 o 5-pin ZXCT1110

• Low quiescent current (3µA).

• Extended industrial temperature range -40 to 125°C

• AEC-Q100 Grade1 Automotive qualified variants

Applications

• Automotive current measurement

• Industrial applications current measurement

• Battery management

• Over current monitor

• Power Management

Pin Assignments

OUT 1

NC 1

GND 2

OUT 3

ZXCT1107/1109/1110

ZXCT1107

Top View

2 S-

3 S+

ZXCT1109

Top View

ZXCT1110

Top View

3 S+

2 S+

3 S-

4 S+

5 S-

Typical Application Circuit

ZXCT1107/1109/1110

Document number: DS35033 Rev. 3 - 2

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ZXCT1107/1109/1110

LOW POWER HIGH-SIDE CURRENT MONITORS

Pin Descriptions

Package SOT23 SOT25

Name ZXCT1107 ZXCT1109 ZXCT1110

OUT 11 1

1

3 Output pin. Current output.

Description

This is the positive input of the current monitor and has a wide

S+ 3 2 4

common-mode input range. This also acts as the analog supply and provides power to internal circuitry. The current through this pin varies with differential sense voltage.

S- 2 3 5

This is the negative input of the current monitor and has a wide common-mode input range.

GND - - 2 Ground pin and substrate connection.

NC - - 1 No connection

Notes. 1. For the ZXCT1107 and ZXCT1109 pin 1 (OUT) acts as both the output pin and substrate connection. This means that for the ZXCT1107 and ZXCT1109 the minimum rail voltage that can be used is 2.5V + V

(see applications section for more details).

OUT

Absolute Maximum Ratings

Description Rating Unit

Voltage on S- and S+ relative to OUT (ZXCT1107/9) -0.3 to 40 V Voltage on S- and S+ relative to GND (ZXCT1110) -0.3 to 40 V Voltage on OUT to GND (ZXCT1110) Differential Sense Voltage, V

SENSE

2,3

-0.3 to V

-0.3 to 0.8 V Current into S+ and S-3 ±8.5 mA Storage Temperature -55 to 150 °C Maximum Junction Temperature 150 °C Package Power Dissipation (TA = 25°C) SOT23 SOT25

300 (De-rate to Zero at 150°C) 300 (De-rate to Zero at 150°C)

ESD Ratings

Human Body Model 1000 V Machine Model 150 V

S+

V

mW

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

Notes: 2. V

3. The differential input voltage limit, V

ZXCT1107/1109/1110

Document number: DS35033 Rev. 3 - 2

SENSE

= VS+ - VS-

- V

, may be exceeded provided that the input current limit into S+ or S- is not exceeded.

S+

S-

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ZXCT1107/1109/1110

LOW POWER HIGH-SIDE CURRENT MONITORS

Recommended Operating Conditions

Symbol Parameter Min Max Unit

ZXCT1110 2.5 36

4

:

SENSE

 100mV)

SENSE

ZXCT1107/9

V

OUT(MAX)

+ 2.5

0 0.5 V

ZXCT1110 0

ZXCT1107/9 0

-40 125 °C

(see applications section for more details).

OUT

5

= 100mV, R

= 0 unless otherwise stated)

GAIN

V

S+

36

- 1

S-

- 2.5

V

NEW PRODUCT

VS+

V

SENSE

V

Output voltage range (0  V

OUT

TA

Notes. 4. For the ZXCT1107 and ZXCT1109 pin 1 (OUT) acts as both the output pin and substrate connection. This means that for the ZXCT1107 and ZXCT1109 the minimum rail voltage that can be used is 2.5V + V

Common-mode input range

Differential Sense Input voltage range (VS+-VS-)

Ambient temperature range

Electrical Characteristics (T

= 25°C, VS+ = 20V, V

A

ZXCT1107, ZXCT1109

Symbol Parameter Conditions

IS-

I

OUT

I

OUT -TC

S- input current

Output current

Output current temperature coefficient full range 370 ppm/ºC

6

CMSR Common-Mode Sense rejection

BW -3dB Small Signal Bandwidth

5

V

V R

= 0V

SENSE

5

= 0mV

SENSE

5

= 10mV

SENSE

5

= 30mV

SENSE

5

= 100mV

SENSE

5

= 200mV

SENSE

5

= 500mV

SENSE

= 2.5V to 36V

S+

SENSE5 (AC)

= 2.5k

GAIN

= 10mV

TA

25°C 19 100

-40°C 16

125°C 35

25°C 1 3 10

-40°C 2.2

125°C 5.5

25°C 37 45 54

-40°C 42

125°C 49

25°C 115 124 134

-40°C 119

125°C 129

25°C 394 408 422

-40°C 396

125°C 420

25°C 787 810 832

-40°C 785

125°C 832

25°C 1.965 2.015 2.064

-40°C 1.965

125°C 2.065

25°C 0.1 0.4

-40°C 0.13

125°C 0.05

PP

25°C 0.65 MHz

Min Typ Max Units

nA

µA

mA

µA/V

ZXCT1107/1109/1110

Document number: DS35033 Rev. 3 - 2

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Electrical Characteristics (T

ZXCT1110

Symbol Parameter Conditions

IQ

IS-

CMSR Common-Mode Sense rejection

IOO

GT

GE Transconductance error

I

OUT GT-TC

V

OUTH

BW -3dB Small Signal Bandwidth

GND pin current

S- input current

Output Offset current

Transconductance

Transconductance temp.co 25°C 265 ppm/ºC

Output relative to VS-

= 25°C, VS+ = 20V, V

A

V

SENSE

V

S+

6,7

V

SENSE

V

SENSE

150mV V

SENSE

150mV

V

SENSE5 (AC)

10mV

2.5k

5

= 2.5V to 36V

5

PP, RGAIN

5

SENSE

= 0V

= 10mV

= 10mV to

=

ZXCT1107/1109/1110

= 100mV, R

TA

25°C 3 5

-40°C 2.2

125°C 5.8

25°C 19 100

-40°C 16

125°C 35

25°C 0.1 0.4

-40°C 0.13

125°C 0.05

25°C 0 ±4

-40°C -1.8

125°C +2.5

25°C 3.928 4 4.072

-40°C 3.9

125°C 4.08

25°C -1.8 1.8 %

25°C -1 -0.78

-40°C -0.88

125°C -0.63

25°C 0.65 MHz

= 0 unless otherwise stated) (cont.)

GAIN

Min Typ Max Units

µA

nA

µA/V

µA

mA/V

V

Notes. 5. V

6. Output current characteristic measured with low impedance ammeter connected to GND

7. Defined as difference between actual output current and 40µA; measured at V currents of the device.

8. For V

SENSE

= “V

SENSE

” – “V

SENSE+

> 10mV, the internal voltage-current converter is fully linear. This enables a true offset to be defined and used.

SENSE

“

-

=10mV. This will include an error due to bias

SENSE

ZXCT1107/1109/1110

Document number: DS35033 Rev. 3 - 2

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Typical Characteristics

12

V = 0V

OUT

V = 0V

SENSE

10

8

)

6

S+

I (µ

4

2

T = 0°C

A

0

010203040

4.0

3.5

3.0

2.5

2.0

S+

I (µA)

1.5

1.0

0.5

0.0 010203040

V (V)

Input Current vs. V

V (V)

I Current vs. V

S+ S+

ZXCT1107/1109/1110

LOW POWER HIGH-SIDE CURRENT MONITORS

9.0

V = 0V

T = 125°C

A

T = 85°C

A

T = 25°C

A

T = -40°C

A

S+

I (µA)

S+

I (nA)

T = 25°C

A

V = 0V

OUT

V = 0V

SENSE

S+

SENSE

8.0

V = 0V

OUT

7.0

V = 20V

S+

6.0

5.0

V = 3.7V

4.0

S+

3.0

2.0

1.0

0.0

-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C)

Input Current vs. A m bi ent Temperature

1.8

T = 25°C

A

V = 0V

1.6

OUT

V = 0V

SENSE

1.4

1.2

1.0

S-

0.8

0.6

0.4

0.2

0.0 010203040

V (V)

S+

I Current vs. V

S- S+

2500

2000

1500

)

OUT

I (µ

1000

V = 20V

S+

V = 0V

OUT

T = 125°C

A

T = -40°C

A

T = 85°C

A

T =25°C

A

T = 0°C

A

450

400 350

300 250

200

150

OUTPUT CURRENT (µA)

500

100

50

0

0 100 200 300 400 500 600

ZXCT1107/1109/1110

Document number: DS35033 Rev. 3 - 2

V (mV)

SENSE

Output Current vs. V

SENSE

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0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT VOLTAGE (V )

Output Cu r r e nt vs. Output Voltage

JULY 2011