Zetex ZXCT1009F, ZXCT1009T8 Datasheet

HIGH-SIDE CURRENT MONITOR

ZXCT1009

DESCRIPTION

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.

Thewideinputvoltagerangeof20V down to as lowas

2.5V make it suitable for a range of applications. A
minimum operating current of just 4µA, combined
with its SOT23 package make it a unique solution,
suitable for portable battery equipment.

FEATURES

• Low cost, accurate high-side current sensing.

• Output voltage scaling.

• Up to 2.5V sense voltage.

• 2.5V – 20V supply range.

• 4µA quiescent current.

•

1% typical accuracy.

•

SOT23 & SM8

†

packages.

APPLICATIONS

Battery Chargers

•

Smart Battery Packs

•

DC Motor control

•

Over current monitor

•

Power Management

•

Level translating

•

Programmable current source

•

APPLICATION CIRCUIT

V

in

R

sense

ZXCT
1009

R

out

To Load

V

out

† 8 leaded SOT223

ISSUE 3 - APRIL 2001

ORDERING INFORMATION

PART NUMBER PACKAGE PARTMARKING

ZXCT1009F SOT23 109

ZXCT1009T8 SM8 ZXCT1009

SM8 due for release May 2001

Sampling April 2001

1

ZXCT1009

ABSOLUTE MAXIMUM RATINGS

Voltage on any pin -0.6V to 20V (relative to I
Continuous output current 25mA
Continuous sense voltage V

+ 0.5V > V

in

sense

†

> Vin– 5V
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Package Power Dissipation (T

= 25°C)

A

SOT23 450mW

SM8 2W

ELECTRICAL CHARACTERISTICS

Test Conditions TA= 25°C, Vin= 5V, R

SYMBOL PARAMETER CONDITIONS LIMITS UNIT

V

in

I

out

V

sense

I

sense

1

VCCRange 2.5 20 V
Output current V

†

Sense Voltage 0 2500 mV
Load pin
input current

Acc Accuracy

Gm Transconductance,

I

out/Vsense

BW Bandwidth RF P

1

Includes input offset voltage contribution

†

V

sense=Vin-Vload

‡ -20dBm=63mVp-p into 50Ω

out

V
V
V
V

R
V

V
V

= 100Ω.

sense
sense
sense
sense
sense

sense
sense

in

sense
sense

=0V
=10mV
=100mV
=200mV
=1V

= 0.1Ω

=200mV

= -20dBm‡

= 10mV dc
= 100mV dc

)

out

Min Typ Max

1
90

0.975

1.95

9.6

4
104

1.002

2.0

9.98

15
120

1.025

2.05

10.2

100 nA

-2.5 2.5 %
10000 µA/V

300
2

µA
µA
mA
mA
mA

kHz
MHz

ISSUE 3 - APRIL 2001

2

TYPICAL CHARACTERISTICS

ZXCT1009

ISSUE 3 - APRIL 2001

3