View ZXCT102106_1339734.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ZXCT1021 Low offset high-side current monitor
Description
The ZXCT1021 is a precision high-side current sense monitor. Using this type of device eliminates the need to disrupt the ground plane when sensing a load current. The ZXCT1021 provides a fixed gain of 10 for applications where minimal sense voltage is required. The very low offset voltage enables a typical accuracy of 3% for sense voltages of only 10mV, giving better tolerances for small sense resistors necessary at higher currents. The wide input voltage range of 20V down to as low as 2.5V make it suitable for a range of applications. With a minimum operating current of just 25A, combined with its SOT235 package make it suitable for portable battery equipment too.
Features
* * * * * * Accurate high-side current sensing Output voltage scaling 2.5V - 20V supply range 25mA quiescent current 1% typical accuracy SOT23-5 package
Applications
* * * * * * * Battery chargers Smart battery packs DC motor control Over current monitor Power management Level translating Programmable current source
Pinout information
NC GND VOUT
Pinout - top view
Typical application circuit
VSENSE-
VSENSE+
Ordering information
Order reference ZXCT1021E5TA Package SOT23-5 Device marking 1021 Status Released Reel size (inches) 7 Quantity per reel 3000 Tape width (mm) 8
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
1
www.zetex.com
ZXCT1021
Absolute maximum ratings
Voltage on any pin with respect to END pin VSENSE Operating temperature Storage temperature Package power dissipation SOT23-5 -0.6V to 20V -0.6V to VIN +0.5V -40 to 85C -55 to 150C (Tamb = 25C) 300mW
Pinout information
Pin name N/C GND VOUT VSENSEVSENSE+ Pin function Not internally connected Ground Voltage output referenced to GND. Intended to drive high impedance loads High impedance negative sense voltage input Supply and positive sense voltage input
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
2
www.zetex.com
ZXCT1021
Electrical characteristics test conditions Tamb = 25C, VIN = 15V
Symbol VIN VOUT Parameter VCC range Output voltage VSENSE = 30mV VSENSE = 100mV VSENSE = 150mV ROUT TC (*) IQ VSENSE () ILOAD Acc Gain BW Output resistance Output voltage temperature coefficient Ground pin current Sense voltage VSENSE- load pin input current Accuracy VOUT / VSENSE Bandwidth VSENSE = 0V VIN = 20V VSENSE = 0V VSENSE = 100mV VSENSE = 100mV VSENSE = 10mV VSENSE = 100mV
NOTES: (*) TC limits are determined by characterization () VSENSE = VIN - VLOAD () This will be reduced at lower VIN voltages due to clipping of output voltage.
Conditions Min. 2.5 291 0.98 1.47 10
Limits Typ. 300 1.00 1.50 15 50 25 0 Max. 20 309 1.02 1.53 20 300 35 1.5 () 100 -2 9.8 10 300 2 2 10.2
Unit V mV V V k ppm A V nA % V/V kHz MHz
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
3
www.zetex.com
ZXCT1021
Typical characteristics
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
4
www.zetex.com
ZXCT1021
Typical characteristics
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
5
www.zetex.com
ZXCT1021
Application information
The ZXCT1021 has a fixed dc voltage gain of 100. No external scaling resistors are required for the output. Output voltage is simply defined as: VOUT = 100 x VSENSE (V) Where VSENSE = VIN - VLOAD
PCB trace shunt resistor for low cost solution
Figure 1 shows a PCB layout suggestion for a low cost solution where a PCB resistive trace in replacement for a conventional shunt resistor, can be used. The resistor section is 25mm x 0.25mm giving approximately 150m using 1 oz copper. Smaller resistances can be used if required. Total circuit solution: 1 component. Shows area of 150m sense resistor compared to SOT23 package. Practical tolerance of the PCB resistor will be around 5% depending on manufacturing methods.
ZXCT1021/2
GND
Load
VOUT VIN
Figure 1 PCB layout suggestion
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
6
www.zetex.com
ZXCT1021
Intentionally left blank
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
7
www.zetex.com
ZXCT1021
Package outline - SOT23-5
DIM A A1 A2 b C D E E1 e e1 L a Min. 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30
Millimeters Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 0.95 REF 1.90 REF 0.10 0 0.60 30 0.0039 0 Min. 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511
Inches Max. 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708 0.0374 REF 0.0748 REF 0.0236 30
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com
Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com
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
Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com
For international sales offices visit www.zetex.com/offices Zetex products are distributed worldwide. For details, see www.zetex.com/salesnetwork This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
Issue 7 - June 2006
(c) Zetex Semiconductors plc 2006
8
www.zetex.com

▲Up To Search▲

Price & Availability of ZXCT102106

	To Download ZXCT102106 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .