Diodes ZXCT1023 User Manual
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 3.5µA
quiescent current makes it ideal for single cell
Li-Ion/polymer battery charge/discharge measurement
applications.
Features
Pin Assignments
TDFN1218-4L
OUT
GND
1
2
Applications
ZXCT1023
Top View
4
S+
3
S-
• Accurate high-side current sensing
• Fixed gain of 50 output scaling
• 2.5V – 20V operating range
• 3.5µA quiescent current
• TDFN1218 package
Typical Application Circuit
V
S+
OUT
• Battery capacity measurement
• Battery chargers
• Over-current monitor
R
S
R
GT
S-
–
+
R
G
GND
ZXCT1023
Document number: DS31997 Rev. 3 - 2
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June 2011
© Diodes Incorporated
ZXCT1023
Pin Descriptions
Pin Name Pin Number Description
1 OUT
2 GND Ground and substrate connection of device
3 S- High impedence negative sense voltage input
4 S+ Positive sense input. Also acts as power supply pin to ZXCT1023
Central Paddle Substrate. Connect to GND
Absolute Maximum Ratings
Description Rating Unit
Voltage on S+ (Note 1) -0.5 to 20 V
Voltage on S- (Note 1, 2), OUT(Note 1)
V
Junction Temperature -40 to 125 °C
Storage Temperature -55 to 150 °C
Package Power Dissipation (TA = 25°C)
TDFN1218
ESD Ratings
Human Body Model 2000 V
Machine Model 150 V
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.
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.
Notes: 1. Measured with respect to GND pin
2. Subject to absolute maximum V
3. V
4. The usable V
Recommended Operating Conditions (T
ZXCT1023
Document number: DS31997 Rev. 3 - 2
(Note 3)
SENSE
is defined as the voltage difference across the sense resistor, RS.
SENSE
range is limited by the output voltage range; and as such will be reduced at lower VS+ values.
SENSE
SENSE
Symbol Parameter Min Max Unit
V
(Note 1)
S+
V
SENSE
V
OUT
TA
Common-Mode Sense Input Range 2.5 20 V
Differential Sense Input Voltage Range 0
Output Voltage Range 0
Ambient Temperature Range -40 85 °C
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Voltage output. The output voltage is referenced to GND.
The overall voltage gain is 50, i.e.,
= 50 x V
V
OUT
not being exceeded.
where V
SENSE
= 25°C)
A
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= VS+ - VS-
SENSE
S+
+0.5
-0.5 V
-0.5 to +2.5 V
mW
V
380
(Note 4)
VS- - 1
mV
V
June 2011
© Diodes Incorporated
MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR
Electrical Characteristics (T
= 25°C, VS+ = 3.6V, V
A
Symbol Parameter Conditions
V
= 0mV
SENSE
V
= 10mV
SENSE
V
OUT
TC
(Note 5)
IQ
IS-
Output voltage
Output voltage temperature
coefficient
Ground pin current
SENSE- input current
Acc Accuracy
Gain
R
OUT
V
OUT/VSENSE
Output resistance 15 kΩ
V
BW Bandwidth
PSRR
(Note 6)
Notes 5. TC limits are determined by characterization.
Power supply rejection ratio
6. PSRR is defined as change in output voltage per change in S+ voltage, V
ZXCT1023
Document number: DS31997 Rev. 3 - 2
V
= 30mV
SENSE
V
= 50mV
SENSE
V
= 100mV, VS+ = 20V
SENSE
50 300 ppm/°C
V
= 0V
SENSE
V
= 0V
SENSE
V
= 50mV
SENSE
= 50mV
SENSE
V
(DC) = 10mV
SENSE
V
(DC) = 50mV
SENSE
V
= 30mV, VS+ = 2.5 to 20V
SENSE
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= 50mV, unless otherwise stated)
SENSE
Limits
Min. Typ. Max.
0.3 50
425 500 575
1.41 1.5 1.59
2.425 2.5 2.575
4.85 5 5.15
3.5 8 μA
100 nA
-3 3 %
50 V/V
300 kHz
1 MHz
50 60 dB
.
S+
ZXCT1023
Unit
mV
V
June 2011
© Diodes Incorporated
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