Diodes ZXCT1051 User Manual
ZXCT1051
Precision wide input range current monitor
Description
The ZXCT1051 is a wide input range current
monitor, which operates over a range of input
voltages from ground up to V
-2V. As a result
CC
the ZXCT1051 can be used on the high or low
side of the load.
The very low offset voltage enables a typical
accuracy of 1% for sense voltages of only
30mV, giving better tolerances for small sense
resistors necessary at higher currents.
Features
• Accurate down to end current sensing
• Output voltage scaling x10
•0 to V
-2V sense input range
CC
• 2.7 to 20V supply range
• 50 µA quiescent current
• 1% typical accuracy
• SOT23-5 package
Pin connections
The ZXCT1051 provides a fixed gain of 10
thereby removing the need for an additional
resistor.
Applications
• Power supply
• DC motor and solenoid control
• Battery management
• Over current monitor
• Power management
• Short circuit detection
Typical application circuit
-
V
SENSE
-
V
OUT
V
CC
GND
V
OUT
V
SENSE
V
SENSE
R
V
SENSE
+
SENSE
-
V
SENSE
V
CC
+
GND
V
+
SENSE
ZXCT1051
V
OUT
Ordering information
Order code Package Partmark Reel size
(inches)
ZXCT1051E5TA SOT23-5 1051 7 8 3,000
Issue 2 - November 2006 1 www.zetex.com
© Zetex Semiconductors plc 2006
Tape width
(mm)
Quantity
per reel
Absolute maximum ratings
VCC max. 20V
ZXCT1051
Voltage on V
SENSE
- and V
+ -0.6 to V
SENSE
CC
Voltage on all other pins -0.6V and VCC +0.6V
V
Operating temperature, T
SENSE
"(V
SENSE
+) - (V
-) 500mV
SENSE
amb
-40 to 125°C
Storage temperature -55 to 150°C
Maximum junction temperature 150°C
Package power dissipation 300mW at T
= 25°C (de-rate to zero at 150°C)
amb
Operation above the absolute maximum rating may cause device failure. Operation at the
absolute maximum ratings, for extended periods, may reduce device reliability.
Recommended operating conditions
Parameter Min. Max. Units
V
SENSE+
V
CC
V
SENSE
V
OUT
Common-mode sense input range 0 VCC-2 V
Supply voltage range 2.7 20 V
Differential sense input voltage range 0 0.3 V
Output voltage range 0 VCC - 2 V
T
amb
Ambient temperature range -40 125 °C
Pin function table
Pin Name Description
1V
CC
2 GND Ground pin
3 OUT Output voltage pin.
4V
5V
SENSE
SENSE
This is the analog supply and provides power to internal circuitry
+ This is the positive input of the current monitor and has an input range from
0V up to V
CC
- This is the negative input of the current monitor and has an input range
from 0V up to V
sense voltage.
– 2V.
– 2V. The current through this pin varies with differential
CC
Issue 2 - November 2006 2 www.zetex.com
© Zetex Semiconductors plc 2006
Electrical characteristics
ZXCT1051
Test conditions T
= 25°C, V
amb
+ = 10V, VCC = 12V, V
SENSE
SENSE
= 100mV
Symbol Parameter Conditions Min. Typ. Max. Units
I
Q
V
OUT
I
SENSE
I
SENSE
V
OUT
VCC pin current V
Output voltage V
+V
-V
TC V
SENSE+
SENSE-
OUT
input current V
input current V
variation with
= 0V 45 70 µA
SENSE
= 0V
SENSE
=30mV
=100mV
=150mV
= 0V 10 150 nA
SENSE
= 0V 60 150 nA
SENSE
0
291
0.98
1.45
6
300
1.00
1.50
15
309
1.02
1.55
mV
mV
V
V
See note (b) 300 ppm/°C
temperature
R
OUT
Gain V
Output resistance 2.5 3.75 5 k⍀
OUT/VSENSE
10
Accuracy Total output error -2 2 %
BW Bandwidth V
SENSE(DC)
= 10mV
V
SENSE(DC)
V
SENSE(AC)
= 10mV
CL = 5pF,
PP
300 kHz
1MHz
= 100mV
PSRR Power supply
rejection ratio refered
to output
CMRR Common mode
rejection ratio refered
to output
NOTES:
(a) V
(b) Temperature dependent measurements are extracted from characterization and simulation results.
SENSE
= "V
SENSE
+" - "V
SENSE
-"
V
= 2.7V to 20V
CC
SENSE
= 20V
CC
SENSE
- = 0V
+ = 0 to 18V
V
V
V
58 dB
66 dB
Issue 2 - November 2006 3 www.zetex.com
© Zetex Semiconductors plc 2006
Loading...