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UZXCT1021E5TA

型号:

UZXCT1021E5TA

品牌:

ZETEX[ ZETEX SEMICONDUCTORS ]

页数:

8 页

PDF大小:

377 K

ZXCT1021  
Low offset high-side current monitor  
Description  
The ZXCT1021 is a precision high-side current giving better tolerances for small sense  
sense monitor. Using this type of device resistors necessary at higher currents.  
eliminates the need to disrupt the ground  
The wide input voltage range of 20V down to as  
plane when sensing a load current.  
low as 2.5V make it suitable for a range of  
The ZXCT1021 provides a fixed gain of 10 for applications. With  
a
minimum operating  
applications where minimal sense voltage is current of just 25µA, combined with its SOT23-  
required.  
5 package make it suitable for portable battery  
equipment too.  
The very low offset voltage enables a typical  
accuracy of 3% for sense voltages of only 10mV,  
Features  
Applications  
Accurate high-side current sensing  
Output voltage scaling  
2.5V – 20V supply range  
25A quiescent current  
1% typical accuracy  
Battery chargers  
Smart battery packs  
DC motor control  
Over current monitor  
Power management  
Level translating  
SOT23-5 package  
Programmable current source  
Pinout information  
Typical application circuit  
NC  
VSENSE  
-
GND  
VSENSE  
+
VOUT  
Pinout - top view  
Ordering information  
Order reference  
Package  
Device  
marking  
Status  
Reel size  
(inches)  
Quantity  
per reel  
Tape width  
(mm)  
ZXCT1021E5TA  
SOT23-5  
1021  
Released  
7
3000  
8
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
1
www.zetex.com  
ZXCT1021  
Absolute maximum ratings  
Voltage on any pin  
-0.6V to 20V  
with respect to END pin  
V
-0.6V to V +0.5V  
SENSE  
IN  
Operating temperature  
Storage temperature  
-40 to 85°C  
-55 to 150°C  
Package power dissipation  
(T  
= 25°C)  
amb  
SOT23-5  
300mW  
Pinout information  
Pin name Pin function  
N/C  
Not internally connected  
Ground  
GND  
V
V
V
Voltage output referenced to GND. Intended to drive high impedance loads  
High impedance negative sense voltage input  
OUT  
-
SENSE  
Supply and positive sense voltage input  
SENSE+  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
2
www.zetex.com  
ZXCT1021  
Electrical characteristics test conditions T  
= 25°C, V = 15V  
amb  
IN  
Symbol  
Parameter  
range  
Conditions  
Limits  
Unit  
Min.  
Typ.  
Max.  
V
V
V
2.5  
20  
309  
1.02  
1.53  
20  
V
IN  
CC  
Output voltage  
V
V
V
= 30mV  
291  
0.98  
1.47  
10  
300  
1.00  
1.50  
15  
mV  
V
OUT  
SENSE  
SENSE  
SENSE  
= 100mV  
= 150mV  
V
R
Output resistance  
k⍀  
ppm  
OUT  
(*)  
C
Output voltage  
temperature coefficient  
50  
300  
T
I
Ground pin current  
Sense voltage  
V
V
= 0V  
= 0V  
25  
35  
A  
Q
SENSE  
(†)  
(‡)  
= 20V  
0
V
IN  
V
1.5  
100  
SENSE  
I
V
load pin  
V
nA  
LOAD  
SENSE-  
SENSE  
input current  
Accuracy  
Acc  
Gain  
BW  
V
V
V
V
= 100mV  
= 100mV  
= 10mV  
-2  
2
%
SENSE  
SENSE  
SENSE  
SENSE  
V
/ V  
9.8  
10  
300  
2
10.2  
V/V  
kHz  
MHz  
OUT  
SENSE  
Bandwidth  
= 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.  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
3
www.zetex.com  
ZXCT1021  
Typical characteristics  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
4
www.zetex.com  
ZXCT1021  
Typical characteristics  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
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:  
V
= 10 x V  
(V)  
OUT  
SENSE  
Where V  
= V - V  
IN LOAD  
SENSE  
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 150musing 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.  
ZXCT1021/2  
Practical tolerance of the PCB resistor will be around 5%  
depending on manufacturing methods.  
GND  
Load  
VOUT VIN  
Figure 1 PCB layout suggestion  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
6
www.zetex.com  
ZXCT1021  
Package outline - SOT23-5  
DIM  
Millimeters  
Inches  
Min.  
Max.  
1.45  
0.15  
1.30  
0.50  
0.26  
3.10  
3.20  
1.80  
Min.  
0.0354  
0.00  
0.0354  
0.0078  
0.0035  
0.1062  
0.0866  
0.0511  
Max.  
A
A1  
A2  
b
C
D
0.90  
0.00  
0.90  
0.20  
0.09  
2.70  
2.20  
1.30  
0.0570  
0.0059  
0.0511  
0.0196  
0.0102  
0.1220  
0.1181  
0.0708  
E
E1  
e
e1  
L
0.95 REF  
1.90 REF  
0.0374 REF  
0.0748 REF  
0.10  
0°  
0.60  
30°  
0.0039  
0°  
0.0236  
30°  
a°  
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
7
www.zetex.com  
ZXCT1021  
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. It is the responsibility of the user to ensure that the circuit is fit for  
the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is  
assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights  
arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract,  
tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract,  
opportunity or consequential loss in the use of these circuit applications, under any circumstances.  
Life support  
Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written  
approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein:  
A. Life support devices or systems are devices or systems which:  
1. are intended to implant into the body  
or  
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the  
labelling can be reasonably expected to result in significant injury to the user.  
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to  
cause the failure of the life support device or to affect its safety or effectiveness.  
Reproduction  
The product specifications contained in this publication are 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 contract or be regarded as a  
representation relating to the products or services concerned.  
Terms and Conditions  
All products are sold subjects to Zetex’ terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two  
when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement.  
For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office.  
Quality of product  
Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer.  
To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our  
regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork  
Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels.  
ESD (Electrostatic discharge)  
Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices.  
The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent  
of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time.  
Devices suspected of being affected should be replaced.  
Green compliance  
Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding  
regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to  
reduce the use of hazardous substances and/or emissions.  
All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with  
WEEE and ELV directives.  
Product status key:  
“Preview”  
“Active”  
Future device intended for production at some point. Samples may be available  
Product status recommended for new designs  
“Last time buy (LTB)”  
Device will be discontinued and last time buy period and delivery is in effect  
“Not recommended for new designs” Device is still in production to support existing designs and production  
“Obsolete”  
Production has been discontinued  
Datasheet status key:  
“Draft version”  
This term denotes a very early datasheet version and contains highly provisional information, which  
may change in any manner without notice.  
“Provisional version”  
“Issue”  
This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance.  
However, changes to the test conditions and specifications may occur, at any time and without notice.  
This term denotes an issued datasheet containing finalized specifications. However, changes to  
specifications may occur, at any time and without notice.  
Zetex sales offices  
Europe  
Americas  
Asia Pacific  
Corporate Headquarters  
Zetex GmbH  
Kustermann-park  
Balanstraße 59  
D-81541 München  
Germany  
Zetex Inc  
Zetex (Asia Ltd)  
Zetex Semiconductors plc  
Zetex Technology Park, Chadderton  
Oldham, OL9 9LL  
700 Veterans Memorial Highway  
Hauppauge, NY 11788  
USA  
3701-04 Metroplaza Tower 1  
Hing Fong Road, Kwai Fong  
Hong Kong  
United Kingdom  
Telefon: (49) 89 45 49 49 0  
Fax: (49) 89 45 49 49 49  
europe.sales@zetex.com  
Telephone: (1) 631 360 2222  
Fax: (1) 631 360 8222  
usa.sales@zetex.com  
Telephone: (852) 26100 611  
Fax: (852) 24250 494  
asia.sales@zetex.com  
Telephone: (44) 161 622 4444  
Fax: (44) 161 622 4446  
hq@zetex.com  
© 2007 Published by Zetex Semiconductors plc  
Issue 9 - July 2007  
© Zetex Semiconductors plc 2007  
8
www.zetex.com  
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