LT6108-1_15 Datasheet, PDF (1/30 Pages) Linear Technology – High Side Current Sense Amplifier with Reference and Comparator

LT6108-1/LT6108-2
High Side Current Sense
Amplifier with Reference
and Comparator
FEATURES
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
APPLICATIONS
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}
DESCRIPTION
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.
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.
TYPICAL APPLICATION
Circuit Fault Protection with Very Fast Latching Load Disconnect
12V
6.2V*
1k
3.3V
1k
10k
0.1Ω
100Ω
SENSEHI SENSELO
V⁺
OUTA
LT6108-1
RESET EN/RST
2N2700
250mA DISCONNECT
OUTC
INC
V^–
IRF9640
TO LOAD
0.1µF
V_OUT
6.04k
1.6k
*CMH25234B
610812 TA01a
Response to Overcurrent Event
V_LOAD
10V/DIV
0V
I_LOAD
200mA/DIV
0mA
V_OUTC
5V/DIV _0V
250mA DISCONNECT
5µs/DIV
610812 TA01b
610812fa
1