LT6109-1 Datasheet PDF - Linear Technology
| Part Number | LT6109-1 | |
| Description | (LT6109-1/-2) High Side Current Sense Amplifier | |
| Manufacturers | Linear Technology | |
| Logo |  |
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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 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
APPLICATIONS
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
LT6109-1/LT6109-2
High Side Current Sense
Amplifier with Reference
and Comparators
DESCRIPTION
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.
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 Latching Load Disconnect and Early Warning Indication
12V
6.2V*
1k
10k
1k
2N2700
0.1Ω
3.3V
1.62k 100k
100Ω
SENSEHI SENSELO
V+ OUTA
LT6109-2
RESET EN/RST
100mA WARNING OUTC2
250mA DISCONNECT OUTC1 V–
INC2
INC1
IRF9640
TO LOAD
0.1µF
VOUT
6.04k
2.37k
1.6k
*CMH25234B
610912 TA01a
Response to Overcurrent Event
VLOAD
10V/DIV
0V
ILOAD
200mA/DIV
0mA
VOUTC1
5V/DIV 0V
VOUTC2
5V/DIV 0V
250mA DISCONNECT
100mA WARNING
5µs/DIV
610912 TA01b
610912fa
1
Free Datasheet http://www.Datasheet4U.com
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LT6109-1/LT6109-2
TYPICAL PERFORMANCE CHARACTERISTICS
V+
=
12V,
VPULLUP
=
V+,
VEN/RST
=
2.7V,
RIN
=
100Ω,
ROUT
=
R1
+
R2
+
R3
=
10k,
Performance characteristics taken at
gain = 100, RC = 25.5k, CL = CLC = 2pF,
uTnAle=s2s5°C,
otherwise noted. (See Figure 3)
Supply Current vs Supply Voltage
700
Start-Up Supply Current
600
V+
500 5V/DIV
0V
400
300
IS
200 500µA/DIV
100
0
0
10 20 30 40 50 60
SUPPLY VOLTAGE (V)
610912 G01
0µA
10µs/DIV
Enable/Disable Response
VEN/RST
2V/DIV
0V
IS
500µA/DIV
0µA
610912 G02
100µs/DIV
610912 G03
Input Offset Voltage
vs Temperature
300
5 TYPICAL UNITS
200
100
0
–100
–200
–300
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
610912 G04
Amplifier Gain Error
vs Temperature
0.05 VSENSE = 5mV TO 100mV
0
–0.05
–0.10
RIN = 1k
RIN = 100Ω
–0.15
–0.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
610912 G07
Amplifier Offset Voltage
vs Supply Voltage
100 5 TYPICAL UNITS
80
60
40
20
0
–20
–40
–60
–80
–100
0
10 20 30 40
SUPPLY VOLTAGE (V)
50 60
610912 G05
Amplifier Gain Error Distribution
25 VSENSE = 5mV TO 100mV
20
15
10
5
0
–0.048 –0.052 –0.056 –0.060 –0.064 –0.68
GAIN ERROR (%)
610912 G08
Offset Voltage Drift Distribution
12
10
8
6
4
2
0
–2 –1.5 –1 –0.5 0 0.5 1 1.5 2
OFFSET VOLTAGE DRIFT (µV/°C)
610912 G06
Amplifier Output Swing
vs Temperature
0.50
0.45
0.40 V+ = 12V
0.35 VSENSE = 120mV
0.30
0.25
0.20
0.15 V+ = 2.7V
0.10 VSENSE = 27mV
0.05
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
610912 G18
610912fa
5
Free Datasheet http://www.Datasheet4U.com
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| Information | Total 28 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LT6109-1.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| LT6109-1 | The function is (LT6109-1/-2) High Side Current Sense Amplifier. Linear Technology | |
| LT6109-2 | The function is (LT6109-1/-2) High Side Current Sense Amplifier. Linear Technology | |
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