ZXCT1107_1107 DIODES [Diodes Incorporated], ZXCT1107_1107 Datasheet

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ZXCT1107_1107

Manufacturer Part Number
ZXCT1107_1107
Description
LOW POWER HIGH-SIDE CURRENT MONITORS
Manufacturer
DIODES [Diodes Incorporated]
Datasheet
Description
Features
Applications
The ZXCT1107/09/10 are high side unipolar current sense
monitors. These devices eliminate the need to disrupt the
ground plane when sensing a load current.
The wide common-mode input voltage range and low
quiescent current coupled with SOT23 packages make
them suitable for a range of applications; including
adapters, automotive and systems operating from industrial
24V rails.
The device is line powered and as such doesn’t need a
separate supply rail.
Quiescent current is only 3µA thereby minimising current
sensing error. One external gain setting resistor increases
versatility by permitting wide gain ranges.
Typical Application Circuit
ZXCT1107/1109/1110
Document number: DS35033 Rev. 3 - 2
Wide supply and common-mode voltage range:
2.5V to 36V
SOT23 packages
o
o
Low quiescent current (3µA).
Extended industrial temperature range -40 to 125°C
AEC-Q100 Grade1 Automotive qualified variants
Automotive current measurement
Industrial applications current measurement
Battery management
Over current monitor
Power Management
3-pin
5-pin
ZXCT1107/09
ZXCT1110
www.diodes.com
LOW POWER HIGH-SIDE CURRENT MONITORS
1 of 16
Pin Assignments
Diodes Incorporated
OUT
OUT
OUT
OUT
NC
NC
GND
GND
OUT
OUT
A Product Line of
1
1
1
1
3
3
2
2
1
1
ZXCT1107
ZXCT1107/1109/1110
ZXCT1109
Top View
Top View
ZXCT1110
Top View
3
3
3
3
2
2
2 S+
2 S+
4
4
5
5
S+
S+
S-
S-
S-
S-
S+
S+
S-
S-
© Diodes Incorporated
JULY 2011

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ZXCT1107_1107 Summary of contents

Page 1

Description The ZXCT1107/09/10 are high side unipolar current sense monitors. These devices eliminate the need to disrupt the ground plane when sensing a load current. The wide common-mode input voltage range and low quiescent current coupled with SOT23 packages make ...

Page 2

Pin Descriptions Package SOT23 Name ZXCT1107 ZXCT1109 1 1 OUT GND - - Notes. 1. For the ZXCT1107 and ZXCT1109 pin 1 (OUT) acts as both the output pin ...

Page 3

Recommended Operating Conditions Symbol V Common-mode input range S+ V Differential Sense Input voltage range (V SENSE Output voltage range (0 ≤ OUT Ambient temperature range T A Notes. 4. For the ZXCT1107 and ZXCT1109 pin 1 (OUT) ...

Page 4

Electrical Characteristics (T ZXCT1110 Symbol Parameter I GND pin current input current S- CMSR Common-Mode Sense rejection 6,7 I Output Offset current OO G Transconductance T GE Transconductance error I G Transconductance temp.co OUT T-TC V Output ...

Page 5

Typical Characteristics OUT SENSE 0° (V) S+ Input Current vs. V 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 ...

Page 6

Typical Characteristics (cont.) 700 600 500 400 300 200 100 0 -40 -25 - TEMPERATURE(°C) Output Current vs. Ambient Temperature 700 600 500 400 300 200 100 (V) S+ Output ...

Page 7

Typical Characteristics (cont.) 4.00 100mV SENSE OUT 3.00% 2.00% 1.00% 0.00% -1.00% -2.00% -3.00% -4.00 (V) S+ Output Current Error vs. V ZXCT1107/1109/1110 Document number: DS35033 Rev ...

Page 8

Typical AC Characteristics 0 -10 Output -20 -30 -40 -50 Input -60 - TIME (µs) Small Signal Pulse Response 0 Output -50 -100 -150 Input -200 -250 0 5 ...

Page 9

Typical AC Characteristics 100 100 1k 10k FREQUENCY (Hz) Common Mode Rejection Ratio CMRR -10 T =25° 20V 100mV ...

Page 10

Application Information Description The current monitor ICs ZXCT1107, ZXCT1109 and ZXCT1110 all use a similar application circuit topology for high-side current sensing, with small differences. The ZXCT1110 has a separate ground pin whereas the ZXCT1107 and ZXCT1109 do not. The ...

Page 11

Application Information (cont.) The ZXCT1110 is highly linear and has a transconductance of 4mA/V ±1.8% and an output of 40µA ±4µ The output current can therefore be calculated (Standard International Units) as (40 +/-4)*10 + ...

Page 12

Application Information (cont.) Note that in order to avoid additional error, V value For V = 100mV, this margin can be reduced to 1.0V. SENSE SENSE R is chosen based on the threshold V SENSE I . ...

Page 13

Application Information (cont.) Alternatively, the ZXCT1110 may be used with a reduced sense voltage if desired. From Equation 3, with ε=4 082 = V = 0.082/(4-1.8) = 37.2mV SENSE ε − Equation 4 gives R ...

Page 14

Application Information (cont.) EMC Susceptibility In many applications, the circuit is required to operate in the presence of RF radiation. This radiation is coupled into the circuit via the supply or load connections and will often cause significant bias shift ...

Page 15

Ordering Information Order Reference Package ZXCT1107SA-7 SOT23 ZXCT1109SA-7 SOT23 ZXCT1110W5-7 SOT25 Package Outline Dimensions Package type: SOT23 Package type: SOT25 ZXCT1107/1109/1110 ...

Page 16

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS 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 ...

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