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LT6108-1/LT6108-2
1
610812fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
High Side Current Sense
Amplifier with Reference
and Comparator
The LT
®
6108 is a complete high side current sense device
that incorporates a precision current sense amplifier, an
integrated voltage reference and a comparator. Two ver-
sions of the LT6108 are available. The LT6108-1 has a
latching comparator and the LT6108-2 has a non-latching
comparator. In addition, the current sense amplifier and
comparator inputs and outputs are directly accessible. The
amplifier gain and comparator trip point are configured
by external resistors. The open-drain comparator output
allows for easy interface to other system components.
The overall propagation delay of the LT6108 is typically only
1.4µs, allowing for quick reaction to overcurrent condi-
tions. The 1MHz bandwidth allows the LT6108 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 LT6108 can capture high speed events.
The LT6108 is fully specified for operation from –40°C to
125°C, making it suitable for industrial and automotive
applications. The LT6108 is available in the small 8-lead
MSOP and 8-lead DFN packages.
Circuit Fault Protection with Very Fast Latching Load Disconnect
APPLICATIONS
n
Current Sense Amplifier
– Fast Step Response: 500ns
– Low Offset Voltage: 125µV Maximum
– Low Gain Error: 0.2% Maximum
n
Internal 400mV Precision Reference
n
Internal Comparator
– Fast Response Time: 500ns
– Total Threshold Error: ±1.25% Maximum
– Latching or Non-Latching Comparator Option
n
Wide Supply Range: 2.7V to 60V
n
Supply Current: 450µA
n
Low Shutdown Current: 5µA Maximum
n
Specified for –40°C to 125°C Temperature Range
n
Available in 8-Lead MSOP and 8-Lead (2mm × 3mm)
DFN Packages
n
Overcurrent and Fault Detection
n
Current Shunt Measurement
n
Battery Monitoring
n
Motor Control
n
Automotive Monitoring and Control
n
Remote Sensing
n
Industrial Control
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.
Response to Overcurrent Event
SENSEHI SENSELO
OUTA
LT6108-1
RESET
INC
250mA DISCONNECT
V
+
EN/RST
OUTC
V
–
0.1Ω
3.3V
12V
100Ω
10k
*CMH25234B
1k
1k
2N2700
6.2V*
6.04k
0.1µF
IRF9640
V
OUT
1.6k
610812 TA01a
TO LOAD
V
LOAD
10V/DIV
I
LOAD
200mA/DIV
V
OUTC
5V/DIV
0V
0V
0mA
610812 TA01b
5µs/DIV
250mA DISCONNECT
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