Diodes ZXCT1030 User Manual

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Diodes Incorporated

ZXCT1030

HIGH-SIDE CURRENT MONITOR WITH COMPARATOR

Description

The ZXCT1030 is a high side current sense monitor containing an internal reference and comparator with a nonlatching output. Using this device eliminates the need to disrupt the ground plane when sensing a load current.

The wide input voltage range of 20V do wn to as low as 2.2V make it suitable for a range of applications. Dynamics and supply current are optimized for the processing of fast pulses, associated with switch mode applications

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Features

• Low cost, accurate high-side current sensing

• Output voltage scaling

• Up to 18V output

• 2.2V - 20V supply range

• Voltage reference on chip

• Comparator on chip

• SO8 package

Pin Assignments

V

CC

V

SENSE-

V

SENSE+

GND

Applications

• Battery chargers

• Electronic fuse

• DC motor control

• Over current monitor

• Power management

• Inrush current limiting

V

COMP_OUT

V

OUT

Vref_out V

COMP_IN

Typical Application Circuit

ZXCT1030

Document number: DS32161 Rev. 4 - 2

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Pin Description

Pin Name Function

VCC V

SENSE-

V

SENSE+

GND V

COMP_IN

V

REF_OUT

V

OUT

V

COMP_OUT

Supply voltage Negative sense input Positive sense input Ground

Comparator input, usually a ratio of the reference or other control signal

Reference output Current monitor output voltage Open collector comparator output

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ZXCT1030

Absolute Maximum Ratings

Parameter Rating Unit

Voltage on any pin

-0.6 and VCC +0.6

V

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

Package Power Dissipation

(T

AMB

= 25)

°C

SO8 700 mW

Recommended Operating Conditions

Parameter Min Max Units

VCC V V V V T

SENSE+

(a)

SENSE OUT COMP_IN AMB

ZXCT1030

Document number: DS32161 Rev. 4 - 2

2.2 20 V

2.2

VCC

V

10 500 mV

0

V

SENSE-

-1V

V

0.005 10 V

-40 85 °C

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Diodes Incorporated

ZXCT1030

Electrical Characteristics (ZXCT1030N8) – Test conditions T

V

COMP_SUPPLY

= 5V unless otherwise stated.

= 25°C, VIN = VCC = 15V, R

AMB

COMP

= 10kΩ,

Symbol Parameter Condition Min. Typ. Max. Unit

CC SENSE

OUT

R

OUT

OUT C

ICC I

SENSE

I

SENSE

CM(MIN)

CC

GAIN

+

-

(B)

Range

CC

Sense+ Range 2.2

Output Voltage

Output Resistance

OUT

Temperature Coefficient Supply Current

+ Input Current

SENSE

- Input Current

SENSE

Minimum Active Common Mode Voltage

ccuracy

OUT/VSENSE

BW Bandwidth

= 0

SENSE

= 10

SENSE

= 30

SENSE

= 50

SENSE

= 100

SENSE

= 500

SENSE

= 15V,

SENSE -

= 1V

OUT

= 15V

SENSE -

= 14.9V

SENSE-

= 15V

CC COMP_SUPPLY = COMP_IN SENSE SENSE SENSE SENSE SENSE

= V

REF

= 10mV = 100mV = 100mV = 10mVp-p = 100mVp-p

5V

2.2 20 V

mV

0

88 284 480 970

4500

2 100 300 500

1000 5000

VCC

10 112 316 520

1030 5500

1.2 1.5 1.8 kΩ

30 ppm/°C

170 270 350 µA

48 90 µA 70 220 nA

2.8 V

-3 3 %

9.7 10.0 10.3 3

6

MHz

COMPARATOR

Input Voltage 0.005 10 V

COMP_IN H

IB

D OL

OH

IOL IOH

Hysteresis 15 mV Input Bias 5 80 150 nA Propagation Delay 100 ns Output Voltage Lo

Output Voltage High Output Sink Current

30 150 200 mV

V

COMP_

SUPPL

ol = 0.4V 2 mA

Output High Leakage Current 1.0 µA

oltage Reference

REF

Delta V

C

Change in V

REF

Reference Current = +300µA to -5µA

SOURCE

300µA

SINK

5µA to

I I

1.200 1.240 1.280 V

10 mV 30 ppm/°C

PSR Supply Rejection 0.01 %/V

Notes: (a) (V (b) Level of V

ZXCT1030

Document number: DS32161 Rev. 4 - 2

SENSE+

) – (V

-)

SENSE

+ where comparator output defaults to ‘off’.

SENSE

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