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LT6109-1/LT6109-2
1
610912fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
High Side Current Sense
Amplifier with Reference
and Comparators
The LT
®
6109 is a complete high side current sense device
that incorporates a precision current sense amplifier, an
integrated voltage reference and two comparators. Two
versions of the LT6109 are available. The LT6109-1 has
the comparators connected in opposing polarity and the
LT6109-2 has the comparators connected in the same polar-
ity. In addition, the current sense amplifier and comparator
inputs and outputs are directly accessible. The amplifier
gain and comparator trip points are configured by external
resistors. The open-drain comparator outputs allows for
easy interface to other system components.
The overall propagation delay of the LT6109 is typically
only 1.4µs, allowing for quick reaction to overcurrent
and undercurrent conditions. The 1MHz bandwidth al-
lows the LT6109 to be used for error detection in critical
applications such as motor control. The high threshold
accuracy of the comparators, combined with the ability to
latch both comparators, ensures the LT6109 can capture
high speed events.
The LT6109 is fully specified for operation from –40°C to
125°C, making it suitable for industrial and automotive ap-
plications. The LT6109 is available in a small 10-lead MSOP.
Circuit Fault Protection with Latching Load Disconnect and Early Warning Indication
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 Latching Comparators with Reset
–
Fast Response Time: 500ns
–
Total Threshold Error: ±1.25% Maximum
–
Two Comparator Polarity Options
n
Wide Supply Range: 2.7V to 60V
n
Supply Current: 550µA
n
Low Shutdown Current: 5µA Maximum
n
Specified for –40°C to 125°C Temperature Range
n
Available in 10-Lead MSOP Package
n
Overcurrent, Undercurrent 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
LT6109-2
INC2RESET
INC12N2700
100mA WARNING
250mA DISCONNECT
*CMH25234B
V
+
EN/RST
OUTC1
OUTC2
V
–
0.1Ω
IRF9640
3.3V
6.2V*
12V
100Ω
6.04k
100k
1.62k10k
1k
1k
0.1µF
V
OUT
2.37k
1.6k
610912 TA01a
TO LOAD
5µs/DIV
V
LOAD
10V/DIV
V
OUTC1
5V/DIV
I
LOAD
200mA/DIV
0V
0V
V
OUTC2
5V/DIV
0V
0mA
610912 TA01b
250mA DISCONNECT
100mA WARNING
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 8 Seite 9
- ・ Paket-Footprint-Pad-Layout on Seite 26
- ・ Blockdiagramm on Seite 9 Seite 10
- ・ Typisches Anwendungsschaltbild on Seite 1 Seite 12 Seite 22 Seite 23 Seite 24
- ・ Technische Daten on Seite 4
- ・ Anwendungsbereich on Seite 1 Seite 4 Seite 10 Seite 11 Seite 12
- ・ Elektrische Spezifikation on Seite 3 Seite 4 Seite 5 Seite 6 Seite 7
