LT6118
Current Sense Amplifier,
Reference and Comparator
with POR
FeaTures
DescripTion
The LT®6118 is a complete high side current sense device
that incorporates a precision current sense amplifier, an
integrated voltage reference and a latching comparator.
The comparator latch functionality can be enabled or
disabled and the comparator can be configured to reset
upon power-on. The input and the open-drain output of
the comparator are independent from the current sense
amplifier. The comparator trip point and amplifier gain are
configured with external resistors.
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Current Sense Amplifier
– Fast Step Response: 500ns
– Low Offset Voltage: 200µV Maximum
– Low Gain Error: 0.2% Maximum
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Internal 400mV Precision Reference
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Internal Comparator
– Power-On Reset Capability
– Fast Response Time: 500ns
– Total Threshold Error: 1.25% Maximum
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Wide Supply Range: 2.7V to 60V
Supply Current: 450µA
TheoverallpropagationdelayoftheLT6118istypicallyonly
1.4µs, allowing for quick reaction to overcurrent condi-
tions. The 1MHz bandwidth allows the LT6118 to be used
for error detection in critical applications such as motor
control. The high threshold accuracy of the comparator,
combined with the ability to latch the comparator, ensures
the LT6118 can capture high speed events.
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Specified for –40°C to 125°C Temperature Range
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Available in 8-Lead MSOP and 8-Lead (2mm × 3mm)
DFN Packages
applicaTions
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Overcurrent and Fault Detection
The LT6118 is fully specified for operation from –40°C to
125°C, making it suitable for industrial and automotive
applications. The LT6118 is available in the small 8-lead
MSOP and 8-lead DFN packages.
L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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Current Shunt Measurement
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Battery Monitoring
Motor Control
Automotive Monitoring and Control
Industrial Control
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Typical applicaTion
Response to Overcurrent Event
Fast Acting Fault Protection with Power-On Reset
0.1Ω
IRF9640
TO LOAD
12V
V
LOAD
0.1µF
1k
100Ω
SENSEHI SENSELO
10V/DIV
6.2V*
24.9k
0V
+
V
V
OUTA
OUT
I
3.3V
10k
LOAD
LE
LT6118
1k
200mA/DIV
100nF
6.04k
1.6k
0mA
V
OUTC
5V/DIV
250mA DISCONNECT
2N2700
OUTC
INC
–
0V
250mA DISCONNECT
V
6118 TA01a
6118 TA01b
5µs/DIV
*CMH25234B
6118f
1
For more information www.linear.com/LT6118