LT6109-1/LT6109-2
High Side Current Sense
Amplifier with Reference
and Comparators
FEATURES DESCRIPTION
n
Current Sense Amplifier
The LT 6109 is a complete high side current sense device
Fast Step Response: 500ns
that incorporates a precision current sense amplifier, an
Low Offset Voltage: 125V Maximum
integrated voltage reference and two comparators. Two
Low Gain Error: 0.2% Maximum
versions of the LT6109 are available. The LT6109-1 has
n
Internal 400mV Precision Reference
the comparators connected in opposing polarity and the
n
Internal Latching Comparators with Reset
LT6109-2 has the comparators connected in the same polar-
Fast Response Time: 500ns
ity. In addition, the current sense amplifier and comparator
Total Threshold Error: 1.25% Maximum
inputs and outputs are directly accessible. The amplifier
Two Comparator Polarity Options
gain and comparator trip points are configured by external
n
Wide Supply Range: 2.7V to 60V
resistors. The open-drain comparator outputs allows for
n
Supply Current: 550A
easy interface to other system components.
n
Low Shutdown Current: 5A Maximum
The overall propagation delay of the LT6109 is typically
n
Specified for 40C to 125C Temperature Range
only 1.4s, allowing for quick reaction to overcurrent
n
Available in 10-Lead MSOP Package
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
APPLICATIONS
accuracy of the comparators, combined with the ability to
n
Overcurrent, Undercurrent and Fault Detection
latch both comparators, ensures the LT6109 can capture
n
Current Shunt Measurement
high speed events.
n
Battery Monitoring
The LT6109 is fully specified for operation from 40C to
n
Motor Control
125C, making it suitable for industrial and automotive ap-
n
Automotive Monitoring and Control
plications. The LT6109 is available in a small 10-lead MSOP.
n
Remote Sensing
L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks
n
Industrial Control
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
Response to Overcurrent Event
Circuit Fault Protection with Latching Load Disconnect and Early Warning Indication
0.1
IRF9640
12V TO LOAD
V
LOAD
0.1F
6.2V* 10V/DIV
1k 100
3.3V
0V
SENSEHI SENSELO
+
V
V OUTA
OUT
I
10k 1.62k 100k
LOAD
LT6109-2
6.04k
200mA/DIV
0mA
RESET EN/RST INC2
V
1k 100mA WARNING OUTC1
250mA DISCONNECT
2.37k
OUTC2 5V/DIV
0V
250mA DISCONNECT
V
OUTC2
2N2700 OUTC1 INC1
100mA WARNING
5V/DIV
V 0V
1.6k
610912 TA01a
610912 TA01b
5s/DIV
*CMH25234B
610912fa
1LT6109-1/LT6109-2
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
+
TOP VIEW
Total Supply Voltage (V to V ) .................................60V
SENSELO 1 10 SENSEHI
Maximum Voltage
+
EN/RST 2 9 V
+
OUTC2 3 8 OUTA
(SENSELO, SENSEHI, OUTA) ............................... V + 1V
OUTC1 4 7 INC2
+
Maximum V (SENSELO or SENSEHI) ....................33V
V 5 6 INC1
Maximum EN/RST Voltage ........................................60V MS PACKAGE
10-LEAD PLASTIC MSOP
Maximum Comparator Input Voltage ........................60V
= 160C/W, = 45C/W
JA JC
Maximum Comparator Output Voltage......................60V
Input Current (Note 2) ..........................................10mA
SENSEHI, SENSELO Input Current ....................... 10mA
Differential SENSEHI or SENSELO Input Current ...2.5mA
Amplifier Output Short-Circuit Duration (to V ) .. Indenfi ite
Operating Temperature Range (Note 3)
LT6109I ................................................40C to 85C
LT6109H ............................................ 40C to 125C
Specified Temperature Range (Note 3)
LT6109I ................................................40C to 85C
LT6109H ............................................ 40C to 125C
Maximum Junction Temperature .......................... 150C
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec) ...................300C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6109AIMS-1#PBF LT6109AIMS-1#TRPBF LTFNJ 10-Lead Plastic MSOP 40C to 85C
LT6109IMS-1#PBF LT6109IMS-1#TRPBF LTFNJ 10-Lead Plastic MSOP 40C to 85C
LT6109AHMS-1#PBF LT6109AHMS-1#TRPBF LTFNJ 10-Lead Plastic MSOP 40C to 125C
LT6109HMS-1#PBF LT6109HMS-1#TRPBF LTFNJ 10-Lead Plastic MSOP 40C to 125C
LT6109AIMS-2#PBF LT6109AIMS-2#TRPBF LTFWY 10-Lead Plastic MSOP 40C to 85C
LT6109IMS-2#PBF LT6109IMS-2#TRPBF LTFWY 10-Lead Plastic MSOP 40C to 85C
LT6109AHMS-2#PBF LT6109AHMS-2#TRPBF LTFWY 10-Lead Plastic MSOP 40C to 125C
LT6109HMS-2#PBF LT6109HMS-2#TRPBF LTFWY 10-Lead Plastic MSOP 40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: