ZXCT1020 datasheet(2/14 Pages) DIODES

Part #	ZXCT1020

Description	Low offset current output current monitor

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Manufacturer	DIODES [Diodes Incorporated]

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ZXCT1020

Issue 1 - August 2007

2

www.zetex.com

Absolute maximum ratings

NOTES:

(a) Subject to VSENSE+ never going 6V below VB.

(b) Subject to absolute maximum VSENSE not being exceeded.

(c) VSENSE is defined as the voltage difference across the sense resistor. and is the voltage across resistor RSH plus the

voltage between S+ and S-.

(d) VSENSE might need to be reduced when used with smaller values of RSH and at larger rails due to increased power dissipation.

Pin out information

Recommended operating conditions

Recommended resistor gain setting combinations

Voltage on VB with respect to GND pin

-0.5V to 20V

Voltage on S+(a), S-(b), OUT with respect to GND pin

-0.5V to VB+0.5V

VSENSE(c)

-0.5V to +2.5V(d)

Junction temperature

-40°C to125°C

Storage temperature

-55°C to 150°C

Package power dissipation (Tamb = 25°C) SOT23-5

300mW

Name

Pin function

1

S+

Positive sense input. Should be tied to positive side of sense resistor via

resistance (RSH) of the order of 150 to 1.5k .

2

GND

Ground and substrate connection of device.

3

OUT

Current output. A gain setting resistor (RG) referenced to GND should be

connected to this pin to set overall voltage gain of:

Gain = RG/RSH

The resistance, RG, placed on out will set the ZXCT1020 output impedance equal

to RG. When driving low impedance loads both RG and RSH should be reduced.

4VB

Input voltage pin. Provides bias to current monitor and should be tied to the

rail whose current is being monitored.

5

S-

High impedance negative sense voltage input

Parameter

Min.

Max.

Units

VSENSE+ Common-mode sense input range

2.5

20

V

VB

Bias pin input voltage range (*)

NOTES:

(*) For best performance VB and VSENSE+ should be referred to the rail whose current is being measured.

2.5

20

V

VSENSE

Differential sense Input voltage range

0

1.5

V

VOUT

Output voltage range

0

VSENSE- - 1

V

RSH

Shunt resistor value

120

2000

TA

Ambient temperature range

-40

85

°C

Gain

RSHUNT

RGAIN

10

1.5k

15k

20

750

15k

50

300

15k

100

150

15k

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