Diodes ZXCT1082, ZXCT1083, ZXCT1084, ZXCT1085, ZXCT1086 User Manual

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Diodes Incorporated

ZXCT1082/83/84/85/86/87

PRECISION HIGH VOLTAGE HIGH-SIDE CURRENT MONITORS

Description

The ZXCT1082 and ZXCT1083 are high side unipolar current sense monitors. These devices eliminate the need to disrupt the ground plane when sensing a load current.

The ZXCT1082/1084/1086 have 60V maximum operating voltage and ZXCT1083/1085/1087 have 40V maximum operating voltage.

The wide common-mode input voltage range and low quiescent currents coupled with SOT25 packages make them suitable for a range of applications; including automotive and systems operating from industrial 24-28V rails.

Their quiescent current is only 0.6µA thereby minimizing current sensing error.

The ZXCT1082 and ZXCT1083 use three external transconductance/gain setting resistors which increase versatility by permitting wide gain ranges and optimization of bandwidths.

The ZXCT1084/5/6/7 are fixed gain voltage output counterparts of the ZXCT1082/3.

Features

• Wide supply and common-mode voltage range

o 2.7V to 60V ZXCT1082/84/86 o 2.7V to 40V ZXCT1083/85/87

• Independent supply and input common-mode voltage

• Low quiescent current (0.6µA).

• AEC-Q100 Grade 1 qualified

• Extended industrial temperate range -40 to 125°C

• Package SOT25

Applications

• Automotive current measurement

• Industrial applications current measurement

• Battery management

• Over current monitor

• Power Management

• Current sources

Pin Assignments

OUT

GND

1

2

5



S+

34

Typical Application Circuits

R

SENSE

R

SENSE

R

GT

OUT

OUT OUT

= V

S-

OUT

= 25 x V = 50 x V

R

GT

S-

OUT

R

G

SENSE

V

SUPPLY

S+

ZXCT1084/1085

V

ZXCT1086/1087

CC

GND

ZXCT1084/85: V ZXCT1086/87: V

V

SUPPLY

S+

V

ZXCT1082/1083

CC

GND

ZXCT1082/83: V

V

S-

CC

* R

R

V

LOAD

Load

SENSE SENSE

V

Load

G

GT

LOAD

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Pin Description

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ZXCT1082/83/84/85/86/87

PIN Name

Common ZXCT1082/3 ZXCT1084/5/6/7

Description

1 OUT Output pin. Current output. Voltage output 2 GND Ground pin.

3 S+

4 S-

5

V

This is the positive input of the current monitor. It has a wide common-mode input range. The current through this pin varies with differential sense voltage.

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

This is the analogue supply and provides power to internal circuitry.

CC

An external resistor, R be connected from S+ to the input

side (V

SUPPLY

) of the sense

resistor An external resistor, R

be connected from S- to the load side (V

) of the sense resistor.

LOAD

, should

GT

, should

GT

Should be directly connected to the input side (V

sense resistor.

Should be directly connected to the load side (V

resistor.

Absolute Maximum Ratings

Parameter Rating Unit

Voltage on S- and S+ ZXCT1082, ZXCT1084, ZXCT1086 ZXCT1083, ZXCT1085, ZXCT1087 Voltage on V

CC

ZXCT1082, ZXCT1084, ZXCT1086 ZXCT1083, ZXCT1085, ZXCT1087

Voltage on OUT Differential Input Voltage, VS+ - VSInput current into S+ or S-

(†)

Storage Temperature -55 to 150 °C Maximum Junction Temperature 150 °C

Package Power Dissipation

300 at T

(De-rate to zero at 150°C)

ESD Rating

Human Body Model 2 kV Machine Model 200 V

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

(†)

The differential input voltage limit, V

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

S+

-0.3 to 65

V

-0.3 to 45

-0.3 to 65

V

-0.3 to 45

-0.3 to V

S-

V

±800 mV

±12 mA

= 25°C

A

mW

SUPPLY

) of the sense

LOAD

) of the

Recommended Operating Conditions

Symbol Parameter Min Max Units

VIN

VCC

V

SENSE

V

OUT

TA

ZXCT1082/83/84/85/86/87

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ZXCT1083/1085/1087 Common-Mode Input Range ZXCT1082/1084/1086 Common-Mode Input Range ZXCT1083/1085/1087 Supply Voltage Range ZXCT1082/1084/1086 Supply Voltage Range Differential Sense Input Voltage Range 0 0.5 V

Output Voltage Range 0 Ambient Temperature Range -40 125 °C

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2.7

40 60 40 60

VS- -1

V

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ZXCT1082/83/84/85/86/87

Electrical Characteristics

Test Conditions TA = 25°C, VS+ = 12V, VCC = 5 V, V (FT = -40°C to +125°C)

Symbol Parameter Conditions Min. Typ. Max. Units

Input

IS+

S+ input current

V

IS-

S- input current

V

VIO

Input Offset Voltage (Note 2)

ZXCT1082/3/4/5 ZXCT1086/87 Temperature co-efficient ±4 µV/K

Output

G

Z

GT

T-ERR

T-TC

OUT

GV

Transconductance Transconductance error

(Note 4) Transconductance

temperature co-efficient Output impedance ZXCT1082/3 1¦¦5 GΩ¦¦pF

ZXCT1082/3 V

(Note 1, 3)

Gain

ZXCT1084/5/6/7

G

V-ERR

Gain error (Note 4)

V (Note 1)

G

V-TC

Z

OUT

V

OUTH

Notes: 1. For the ZXCT1082/83 V For the ZXCT1083/84/85/86 V

Voltage gain temperature co-efficient

Output impedance ZXCT1084/5/6/7 125 kΩ

Output relative to common mode, V

2. V

is extrapolated from measurements for the gain-error test.

IO

3. For V

SENSE

4. Gain or transconductance error is calculated by applying two values of V

S-

SENSE

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

ZXCT1082/3

ZXCT1084/5/6/7

= “V

SUPPLY

= “VS+” – “VS-“

SENSE

1

= 100mV, ZXCT1082/3 RGT = 5kΩ, RG = 125kΩ; unless otherwise stated.

SENSE

= 0mV (Note 1)

SENSE

= 0mV

SENSE

= 10mV to 150mV

SENSE

= 10mV to 150mV

SENSE

” – “V

LOAD

“ where V

1.7 TA = FT

5

1.7 TA = FT

5 ±0.2 ±1 T T

= FT

A

= FT

A

±2.5

±3

200 µA/V

-1 +1 TA = FT

= FT

T

A

-2 +2 10 nA/K

1084/5 25 1086/7 50

-1 +1 TA = FT

= FT

T

A

is the load voltage or the lower potential side of the sense resistor.

LOAD

and calculating the error of the slope vs. the ideal.

SENSE

-2 +2 100 ppm/K

V

LOAD

- 1

V

LOAD

V

S-

- 1 V

- 0.8

S-

µA

mV

%

V/V

%

V

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Electrical Characteristics (cont.)

Test Conditions TA = 25°C, VS+ = 12V, VCC = 5 V, V (FT = -40°C to +125°C)

Symbol Parameter Conditions Min. Typ. Max. Units

AC characteristics

BW

t

s(0.1%)

-3dB Small Signal Bandwidth

Settling time (0.1%)

V

SENSE (AC)

(Note 1) V

SENSE

step V

SENSE

step f = 1kHz f = 10kHz 10

f = 0.1Hz to 100kHz 3

f = 1kHz

f = 10kHz

f = 0.1Hz to 100kHz

i

N-OUT

v

N-OUT

Output noise current density

Total output noise current

Output noise voltage density

Total output noise voltage

Power Supply

ICC V

Supply current V

CC

SENSE

ZXCT1083/5: V

= 2.7V to 40V

V

CC

ZXCT1087: V

PSRR (Note 5)

VCC Supply rejection ratio

= 2.7V to 40V

V

CC

ZXCT1082/4: V

= 2.7V to 60V

V

CC

ZXCT1086: V

= 2.7V to 60V

V

CC

ZXCT1083/5: V

= 2.7V to 40V

V

S+

ZXCT1087: V

CMRR (Note 5)

Common-mode sense rejection ratio

= 2.7V to 40V

V

S+

ZXCT1082/4: V

= 2.7V to 60V

V

S+

ZXCT1086: V

= 2.7V to 60V

V

S+

Notes: 5. Measured relative to input

1

= 100mV, ZXCT1082/3 RGT = 5kΩ, RG = 125kΩ; unless otherwise stated.

SENSE

= 10mV

PP

G = 25 500 G = 50 200

= 50mV to 300mV

= 50mV to 200mV

G = 25 5

G = 50 7

12

ZXCT1082/3

ZXCT1084/5 1.5 ZXCT1086/7 2.9 ZXCT1084/5 1.2 ZXCT1086/7 2.3 ZXCT1084/5 390 ZXCT1086/7 730

= 0V

SENSE

= 60mV;

= 30mV;

= 60mV;

= 30mV;

= 60mV;

= 30mV;

= 60mV;

= 30mV;

0.6

TA = FT

2

80 100

TA = FT

75

80 100

TA = FT

75

80 100

TA = FT

75

80 100

TA = FT

75

80 100

TA = FT

80

80 100

TA = FT

80

80 100

TA = FT

80

80 100

TA = FT

80

pA/√Hz

nA

µV/√Hz

µV

kHz

µs

RMS

µA

dB

ZXCT1082/83/84/85/86/87

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