DIODES ZXCT1030X8TA

ZXCT1030
High-side current monitor with comparator
Description
The ZXCT1030 is a high side current sense
monitor containing an internal reference and
comparator with a non-latching output. Using
this device eliminates the need to disrupt the
ground plane when sensing a load current.
The wide input voltage range of 20V down to as
low as 2.2V make it suitable for a range of
applications. Dynamics and supply current are
optimized for the processing of fast pulses,
associated with switch mode applications.
Features
Applications
•
Low cost, accurate high-side current sensing
•
Battery chargers
•
Output voltage scaling
•
Electronic fuse
•
Up to 18V output
•
DC motor control
•
2.2V - 20V supply range
•
Over current monitor
•
Voltage reference on chip
•
Power management
•
Comparator on chip
•
Inrush current limiting
•
SO8 package
Typical application circuit
Ordering information
Device
Status
Package
Device
marking
Reel size
(inches)
Tape width
(mm)
Quantity
per reel
ZXCT1030X8TA
Last time buy
MSOP8
ZXCT1030
7
12
1000
ZXCT1030N8TA
Active
SO8
ZXCT1030
7
12
500
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com
ZXCT1030
Absolute maximum ratings
Voltage on any pin
Operating temperature
Storage temperature
Package power dissipation
MSOP8
-0.6V and VCC +0.6V
-40 to 85°C
-55 to 125°C
(Tamb = 25°C)
500mW
Recommended operating conditions
Parameter
VCC
VSENSE+
VSENSE(a)
VOUT
Vcomp-in
Tamb
Min.
2.2
2.2
10
Max.
20
VCC
500
Unit
V
V
mV
0
0.005
-40
VSENSE-1V
10
85
V
V
°C
Pin-out connections
VCC
VSENSEVSENSE+
GND
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
Vcomp_out
VOUT
Vref_out
Vcomp_in
Pin name
VCC
Function
Supply voltage
VSENSE-
Negative sense input
VSENSE+
Positive sense input
GND
Vcomp_in
Vref_out
VOUT
Ground
Comparator input, usually a ratio of the
reference or other control signal
Reference output
Current monitor output voltage
Vcomp_out
Open collector comparator output
2
www.zetex.com
ZXCT1030
Electrical characteristics (ZXCT1030X8) - Test conditions Tamb = 25°C, VIN = VCC = 15V,
Rcomp = 10kV, Vcomp_supply = 5V unless otherwise stated.
Symbol
Parameter
Conditions
VCC
VSENSE+
VOUT
VCC range
Sense+ range
Output voltage
Output resistance
VOUT
temperature coefficient
Supply current
VSENSE+ input current
VSENSE- input current
(b)
Minimum active common
VCM(min)
mode voltage
ROUT
VOUT
TC
ICC
ISENSE+
ISENSE-
ACC
Gain
BW
Accuracy
VOUT /VSENSE
Bandwidth
VSENSE = 0V
VSENSE = 10mV
VSENSE = 30mV
VSENSE = 50mV
VSENSE = 100mV
VSENSE = 500mV
VSENSE- = 15V, VOUT = 1V
VSENSE- = 15V
VSENSE- = 14.9V
VCC =15V
Vcomp_supply = 5V
Vcomp_in = VREF
VSENSE = 10mV
VSENSE =100mV
VSENSE = 100mV
VSENSE =10mVp-p
VSENSE = 100mVp-p
Comparator
Input voltage
Vcomp_in
VH
Hysteresis
Input bias
IB
Propagation delay
TD
VOL
Output voltage low
Output voltage high
VOH
Min.
2.2
2.2
0
88
284
480
970
4500
1.2
170
25
25
2.8
-3
9.7
Limits
Typ.
2
100
300
500
1000
5000
1.5
30
270
48
70
10.0
3
6
0.005
5
30
Unit
Max.
20
VCC
10
112
316
520
1030
5500
1.8
V
mV
mV
mV
mV
mV
mV
k⍀
ppm/°C
350
90
220
µA
µA
nA
V
3
10.3
%
MHz
MHz
10
15
80
100
150
V
mV
150 nA
ns
200 mV
Vcomp_ V
supply
Output sink current
Output high leakage
current
Voltage reference
Vref
IOL
IOH
delta Vref
TC
PSR
Change in Vref
VOL = 0.4V
2
1.0
Reference current =
+300␮A to -5␮A
Isource 5␮A to
Isink 300␮A
1.200
1.240
10
30
0.01
Supply rejection
mA
µA
1.280 V
mV
ppm/°C
%/V
NOTES:
(a) VSENSE = (VSENSE+) - (VSENSE-)
(b) Level of VSENSE+ where comparator output defaults to 'off'.
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
3
www.zetex.com
ZXCT1030
Electrical characteristics (ZXCT1030N8) - Test conditions Tamb = 25°C, VIN = VCC = 15V,
Rcomp = 10kV, Vcomp_supply = 5V unless otherwise stated.
Symbol
Parameter
Conditions
VCC
VSENSE+
VOUT
VCC range
Sense+ range
Output voltage
Output resistance
VOUT
temperature coefficient
Supply current
VSENSE+ input current
VSENSE- input current
(b)
Minimum active common
VCM(min)
mode voltage
ROUT
VOUT
TC
ICC
ISENSE+
ISENSE-
ACC
Gain
BW
Accuracy
VOUT /VSENSE
Bandwidth
VSENSE = 0V
VSENSE = 10mV
VSENSE = 30mV
VSENSE = 50mV
VSENSE = 100mV
VSENSE = 500mV
VSENSE- = 15V, VOUT = 1V
Min.
2.2
2.2
0
88
284
480
970
4500
1.2
VSENSE- = 15V
170
VSENSE- = 14.9V
VCC =15V
Vcomp_supply = 5V
Vcomp_in = VREF
VSENSE = 10mV
VSENSE =100mV
VSENSE = 100mV
VSENSE =10mVp-p
VSENSE = 100mVp-p
Comparator
Input voltage
Vcomp_in
VH
Hysteresis
Input bias
IB
Propagation delay
TD
VOL
Output voltage low
Output voltage high
VOH
Limits
Typ.
2
100
300
500
1000
5000
1.5
30
270
48
70
Unit
Max.
20
VCC
10
112
316
520
1030
5500
1.8
10.0
3
6
0.005
5
30
mV
mV
mV
mV
mV
mV
k⍀
ppm/°C
350
90
220
µA
µA
nA
V
3
10.3
%
2.8
-3
9.7
V
MHz
MHz
10
15
80
100
150
V
mV
150 nA
ns
200 mV
Vcomp_ V
supply
Output sink current
Output high leakage
current
Voltage reference
Vref
IOL
IOH
delta Vref
TC
PSR
Change in Vref
VOL = 0.4V
2
1.0
Reference current =
+300␮A to -5␮A
Isource 5␮A to
Isink 300␮A
1.200
1.240
10
30
0.01
Supply rejection
mA
µA
1.280 V
mV
ppm/°C
%/V
NOTES:
(c) VSENSE = (VSENSE+) - (VSENSE-)
(d) Level of VSENSE+ where comparator output defaults to 'off'.
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
4
www.zetex.com
ZXCT1030
Typical characteristics
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
5
www.zetex.com
ZXCT1030
Voltage output current monitor
Referring to the block diagram, the current monitor takes the small voltage developed across the
sense resistor (VSENSE) and transfers it from the large common mode supply voltage to a groundreferenced signal with a gain of 10. The sense input common mode range is 2.2V to 20V. In this
range, a linear output voltage is delivered.
Reference
The bandgap reference allows the comparator to compare the translated Vsense with threshold
value chosen by the user which can be any voltage from 0 to 1.24V, configured by two external
resistors which forms Vcomp_in.
The output current which can be drawn from the comparator reference (Iref source) is limited to
5µA, making potentiometers ⱖ250k⍀ suitable for setting a threshold level. Where a lower
potentiometer resistor value is used, an additional resistor value should be inserted between Vref
and VCC to maintain sufficient current for the reference. (as shown in Figure 1).
Figure 1: External resistor for reference level
The voltage reference has a maximum current sink capability. This magnitude of current will be
influenced by the value of R1 which is inserted between Vref and VCC. The value of current flowing
through R1 can be expressed as:
I = (VCC -Vref) / R1
Comparator
The open collector output is active low and is asserted when VSENSE x 10 (VOUT) > Vcomp_in.
It can be connected to any voltage rail up to Vin via a pull-up resistor. Suggest values for the
resistor are in the range of 10-100k⍀.
In the case where high load currents or a short circuit occurs, thus reducing the common mode
signals (V+, V-) typically below 2.2V, the comparator will default to the asserted state. This can
eliminate a closed loop system 'latch-up' condition, allowing the controller to remove the applied
power.
Stability
To ensure stable operation of the ZXCT1030, it is recommended a decoupling capacitor is placed
across the VCC and ground connections. A ceramic 10␮F will be adequate.
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
6
www.zetex.com
ZXCT1030
Intentionally left blank
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
7
www.zetex.com
ZXCT1030
Package outline - SO8
DIM
Inches
Millimeters
DIM
Inches
Min.
Millimeters
Min.
Max.
Min.
Max.
Max.
A
0.053
0.069
1.35
1.75
e
A1
0.004
0.010
0.10
0.25
b
0.013
0.020
0.33
0.51
D
0.189
0.197
4.80
5.00
c
0.008
0.010
0.19
0.25
H
0.228
0.244
5.80
6.20
⍜
0°
8°
0°
8°
E
0.150
0.157
3.80
4.00
h
0.010
0.020
0.25
0.50
L
0.016
0.050
0.40
1.27
-
-
-
-
-
0.050 BSC
Min.
Max.
1.27 BSC
Note: Controlling dimensions are in inches. Approximate dimensions are provided in millimeters
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
8
www.zetex.com
ZXCT1030
Package outline - MSOP8
c
e
E
E1
R1
D
L
R
A2
b
A
A1
DIM
A
A1
A2
b
c
D
E
E1
e
L
R
R1
Millimeters
Min.
0.05
0.75
0.25
0.13
2.90
Inches
Max.
1.10
0.15
0.95
0.40
0.23
3.10
Min.
0.002
0.0295
0.010
0.005
0.114
4.90 BSC
2.90
0.193 BSC
3.10
0.114
0.65 BSC
0.40
0.07
0.07
Max.
0.0433
0.006
0.0374
0.0157
0.009
0.122
0.122
0.025 BSC
0.70
-
0.0157
0.0027
0.0027
0.0192
-
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Issue 3 - June 2007
© Zetex Semiconductors plc 2007
9
www.zetex.com
ZXCT1030
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”
Future device intended for production at some point. Samples may be available
“Active”
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”
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.
“Issue”
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
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Zetex Inc
700 Veterans Memorial Highway
Hauppauge, NY 11788
USA
Zetex (Asia Ltd)
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Zetex Semiconductors plc
Zetex Technology Park, Chadderton
Oldham, OL9 9LL
United Kingdom
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 3 - June 2007
© Zetex Semiconductors plc 2007
10
www.zetex.com