zxct1010 Zetex Semiconductors plc., zxct1010 Datasheet

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zxct1010

Manufacturer Part Number
zxct1010
Description
Zxct1010 - Enhanced High-side Current Monitor
Manufacturer
Zetex Semiconductors plc.
Datasheet

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ISSUE 10 - JULY 2007
ENHANCED HIGH-SIDE CURRENT MONITOR
DESCRIPTION
The ZXCT1010 is a high side current sense monitor.
Using this device eliminates the need to disrupt the
ground plane when sensing a load current.
It is an enhanced version of the ZXCT1009 offering
reduced typical output offset and improved accuracy
at low sense voltage.
The wide input voltage range of 20V down to as low as
2.5V make it suitable for a range of applications. A
minimum operating current of just 4µA, combined
with its SOT23-5 package make suitable for portable
battery equipment.
FEATURES
ORDERING INFORMATION
PARTMARK
PACKAGE
ZXCT1010E5TA
Low cost, accurate high-side current sensing
Output voltage scaling
Up to 2.5V sense voltage
2.5V – 20V supply range
300nA typical offset current
3.5µA quiescent current
1% typical accuracy
SOT23 -5 package
DEVICE
101
SOT23-5
REEL
SIZE
7”
WIDTH
TAPE
8mm
QUANTITY PER
3,000 units
REEL
1
APPLICATIONS
APPLICATION CIRCUIT
Battery chargers
Smart battery packs
DC motor control
Over current monitor
Power management
Programmable current source
S E M I C O N D U C T O R S
ZXCT1010

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zxct1010 Summary of contents

Page 1

... ENHANCED HIGH-SIDE CURRENT MONITOR DESCRIPTION The ZXCT1010 is a high side current sense monitor. Using this device eliminates the need to disrupt the ground plane when sensing a load current enhanced version of the ZXCT1009 offering reduced typical output offset and improved accuracy at low sense voltage. ...

Page 2

... ZXCT1010 ABSOLUTE MAXIMUM RATINGS Voltage on any pin Continuous output current OUT 2 Continuous sense voltage SENSE Operating temperature Storage temperature Package power dissipation SOT23-5 Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. ...

Page 3

... TYPICAL CHARACTERISTICS ISSUE 10 - JULY 2007 ZXCT1010 ...

Page 4

... ZXCT1010 PIN DESCRIPTION Pin Name Pin Function V + Supply voltage sense V - Connection to load/battery sense I Output current, proportional to V out GND Ground CONNECTION DIAGRAM SOT23-5 Package Suffix – E5 Top View SCHEMATIC DIAGRAM load 4 ISSUE 10 - JULY 2007 ...

Page 5

... The device power dissipation given by the D expression .( Watts D out in out ISSUE 10 - JULY 2007 ZXCT1010 APPLICATIONS INFORMATION The following lines describe how to scale a load current to an output voltage sense in load out sense E. current represented by a 100mV output ...

Page 6

... Switching frequency of the PWM loop is approximately 120kHz Bi-Directional Current Sensing The ZXCT1010 can be used to measure current bi-directionally, if two devices are connected as To Battery + shown below. Load ...

Page 7

... The data for the normalised graph was obtained using a 1A load current and a 100Ω output resistor. An electronic version of the PCB layout is available at www.zetex.com/isense ISSUE 10 - JULY 2007 ZXCT1010 Actual Size Layout shows area of shunt resistor compared to SOT23-5 package. Not actual size 7 ...

Page 8

... ZXCT1010 Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The circuits in this design/application note are offered as design ideas the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements ...

Page 9

... Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com 9 ZXCT1010 Inches MAX MIN MAX 3.00 0.102 0.118 1.75 0.059 0.069 0.95 REF 0.037 REF 1.90 REF 0.075 REF ...

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