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A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Description The ZXCT1023 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 ZXCT1023 has a fixed internal gain of 50 and the only external component required is the external current sense resistor; this combined with its 1.2mm x 1.8mm TDFN package more than quarters the solution size of the ZXCT1010. The wide input voltage range of 20V down to as low as 2.5V makes it suitable for a range of applications. The combination of operation down to 2.5V and just 3.5A quiescent current makes it ideal for single cell Li-Ion/polymer battery charge/discharge measurement applications. Pin Connections
TDFN1218-4L OUT 1 GND 2 Top View 4 S+ 3 S-
Features
Typical Operating Circuit
* * * * *
Accurate high-side current sensing Fixed gain of 50 output scaling 2.5V - 20V operating range 3.5A quiescent current TDFN1218 package
S+ RGT
RS
S-
Applications
* Battery capacity measurement * Battery chargers * Over-current monitor
- +
VOUT RG GND
Ordering Information
Order Reference ZXCT1023DFGTA
Package TDFN1218
Device Marking 1023
Status Active
Reel Size (inches) 7
Quantity per Reel 3000
Tape Width (mm) 8
ZXCT1023
Rev. 2
1 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Absolute maximum ratings 1 Voltage on S+ ................................................. -0.5V to 20V 1,2 1 Voltage on S- , OUT ............................ -0.5V to VS++0.5V 3 VSENSE ........................................................... -0.5V to +2.5V Junction temperature ........................................ -40 to125C Storage temperature ........................................ -55 to 150C Package power dissipation (TA = 25C) TDFN1812-4 ................................................................. mW These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability Notes: 1. Measured with respect to GND pin 2. Subject to absolute maximum VSENSE not being exceeded. 3. VSENSE is defined as the voltage difference across the sense resistor, RS. 4. The usable VSENSE range is limited by the output voltage range; and as such will be reduced at lower VS+ values. Electrical characteristics TA = 25C, VS+ = 3.6V, VSENSE = 50mV, unless otherwise stated Symbol Parameter Conditions VSENSE = 0mV VSENSE = 10mV VSENSE = 30mV VSENSE = 50mV VSENSE = 100mV, VS+ = 20V Limits Typ. 0.3 425 500 1.41 1.5 2.425 2.5 4.85 5 Min. 50 VSENSE = 0V VSENSE = 0V VSENSE = 50mV VSENSE = 50mV 3.5 -3 50 15 300 1 60 Unit mV Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. ESD ratings: Human body model ....................................... 2000V Machine Model .................................................. TBD Recommended operating conditions Parameter MIN 1 VS+ , Common-mode sense 2.5 input range VSENSE, Differential Sense Input 0 voltage range VOUT, Output Voltage range 0 TA, Ambient temperature -40 range MAX 20 380
4
Units V mV V C
VS- - 1 85
VOUT
Output voltage
Max. 50 575 1.59 2.575 5.15 300 8 100 3
V ppm A nA % V/V k kHz MHz dB
TC
5
IQ ISAcc Gain ROUT BW PSRR6
Notes 5. 6.
Output voltage temperature coefficient Ground pin current SENSE- input current Accuracy VOUT/VSENSE Output resistance Bandwidth
VSENSE (DC) = 10mV VSENSE (DC) = 50mV Power supply rejection ratio VSENSE = 30mV, VS+ = 2.5 to 20V
TC limits are determined by characterization. PSRR is defined as change in output voltage per change in S+ voltage, VS+.
50
ZXCT1023
Rev. 2
2 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Typical DC characteristics
2.5
3%
VSENSE = 0V, VS+ = 3.6V TA = -40C
TA = 85C Differential Gain Error 2% TA = -40C 1%
Vs+ = 3.6v Relative to gain = 50
2
TA = 0C
IS+ (A)
1.5
TA = 25C 0% TA = 0C
TA = 85C
1
-1%
0.5
-2%
0 2 4 6 8 10 12 14 16 18 20
0
10
VS+ (V)
20 30 VSENSE (mV)
40
50
S+ input current vs Supply voltage
70 Differential Gain (VOUT/VSENSE) TA = 0C -40C 60 25C 50 85C 2.5 VOUT (V) 2 3.5 VS+ = 3.6V 3
Normalised gain error Vs Sense voltage
VS+ = 3.6V TA = 85C TA = 25C TA = 0C TA = -40C
40
1.5 1
30 0.5 20 0 2 4 VSENSE (mV) 6 8 10 0 0 10 20 30 VSENSE (mV) 40 50 60
Differential gain Vs Sense voltage
3 TA = 25C 2.5 2 VSENSE = 30mV 1.5 1 VSENSE = 10mV 0.5 0 2 4 6 8 10 12 14 16 18 20 VS+ (V)
-0.4% VOUT %Error 0.6%
Output Voltage Vs Sense voltage
VSENSE = 50mV
0.4% 10mV 0.2%
VS+ =3.6V w.r.t. VOUT at 25C VSENSE = 10mV, 30mV, 50mV
VOUT (V)
0.0%
30mV 50mV 50mV 30mV
-0.2%
-0.6% -40 -15 10 35 Temperature (C) 60 85
Output voltage VS+ Input voltage
Relative output voltage change Vs Temperature
ZXCT1023
Rev. 2
3 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Typical AC characteristics
40 VSENSE = 50mV 30 20 Gain (dB) 10 0 -10 -20 10E+0 VS+=3.6V TA =25C VSENSE = 10mV PSRR (dB) 70 60 50 40 30 VS+ = 20 10 0 0.01 VS+ = 10V TA = 25C VSENSE = 50mV
100E+0
1E+3
10E+3 100E+3 frequency (Hz)
1E+6
10E+6
0.1
1 10 Frequency (kHz)
100
1000
Small signal frequency response
25 20 15 Input (mV) 10 5 0 0 -5 50 100 150 Time (s) 200 250
Input Output VS+=3.6V, TA = 25C VSENSE = 20mV l
Power supply rejection ratio
1.2 1 0.8 Input (mV) Output (V) 0.6 0.4 0.2 0 0 300 -0.2 -10 0 50 100 Time (s) 150 0.0 -0.5 200 60 50 40 30 20
Output Input VS+=3.6V, TA = 25C VSENSE = 50mV l
3.0 2.5 2.0 1.5 1.0 0.5 Output (V)
VOUT (V)
10
Large signal pulse response 20mV
56 55 Sense voltage (mV) 54 53 52 51 50 49 0 50 100 time (s) 150
Output VS+=3.6V, TA =25C VSENSE = 50mV(DC) + 5mV l Input
Large signal pulse response 50mV
2.80 2.75 Output voltage (V) 2.70 2.65 2.60 2.55 2.50 2.45 200
51 50 49 VSENSE (mV) 48 Input 2.35 Output 2.30 2.25 2.20 150 47 46 45 44 0 25 50 75 time (s) 100 125 VS+=3.6V, TA =25C VSENSE = 50mV(DC) - 5mV pulse 2.55 2.50 2.45 2.40
Small signal positive pulse response Pin out information Pin No. 1 2 3 4 Name OUT GND SS+ Central Paddle
Small signal negative pulse response
Pin Function Voltage output. The output voltage is referenced to GND. The overall voltage gain is 50, i.e., VOUT = 50 x VSENSE where VSENSE = VS+ - VSGround and substrate connection of device. High impedance negative sense voltage input Positive sense input. Also acts as power supply pin to ZXCT1023 Substrate. Connect to GND.
ZXCT1023
Rev. 2
4 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Application information The ZXCT1023 is line powered (derives its power from the rail being sensed) this reduces the number of pins used and PCB trace routing. The fixed gain of 50 reduces the PCB area by reducing the number of external components. The only external component required is the sense resistor. This coupled with the 1.2mm x 1.8mm TDFN package makes the solution size very small. The fixed gain of 50 has been chosen to meet the normal requirements of most applications.
S+ RGT
RS
S-
- +
VOUT RG GND
The ZXCT1023 has its gain setting resistor, RG, set at 15k which further reduces power consumption at larger VSENSE. Application Examples Please refer to Zetex AN39 for sample applications.
Package Outline TDFN1812-4 package
ZXCT1023
Rev. 2
5 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Recommended PCB Land Pattern
ZXCT1023
Rev. 2
6 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZXCT1023
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDING TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated 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 Diodes Incorporated. 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 labeling 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. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2009, Diodes Incorporated www.diodes.com
ZXCT1023
Rev. 2
7 of 7 www.diodes.com
October 2009
(c) Diodes Incorporated

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