Linear Technology DC1192A - LT6105 Current Sense Demo Board DC1192A DC1192A 数据表
产品代码
DC1192A
LT6105
1
6105fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Precision, Extended Input
Range Current Sense Amplifi er
The LT
®
6105 is a micropower, precision current sense
amplifi er with a very wide input common mode range.
The LT6105 monitors unidirectional current via the volt-
age across an external sense resistor. The input common
mode range extends from –0.3V to 44V, with respect to
the negative supply voltage (V
The LT6105 monitors unidirectional current via the volt-
age across an external sense resistor. The input common
mode range extends from –0.3V to 44V, with respect to
the negative supply voltage (V
–
). This allows the LT6105
to operate as a high side current sense monitor or a low
side current sense monitor. It also allows the LT6105 to
monitor current on a negative supply voltage, as well as
continuously monitor a battery from full charge to depletion.
The inputs of LT6105 can withstand differential voltages
up to ±44V, which makes it ideal for monitoring a fuse or
MOSFET switch.
side current sense monitor. It also allows the LT6105 to
monitor current on a negative supply voltage, as well as
continuously monitor a battery from full charge to depletion.
The inputs of LT6105 can withstand differential voltages
up to ±44V, which makes it ideal for monitoring a fuse or
MOSFET switch.
Gain is confi gured with external resistors from 1V/V to
100V/V. The input common mode rejection and power
supply rejection are in excess of 100dB and the input offset
voltage is less than 300μV. A typical slew rate of 2V/μs
ensures fast response to unexpected current changes.
100V/V. The input common mode rejection and power
supply rejection are in excess of 100dB and the input offset
voltage is less than 300μV. A typical slew rate of 2V/μs
ensures fast response to unexpected current changes.
The LT6105 can operate from an independent power
supply of 2.85V to 36V and draws only 150μA. When
V
supply of 2.85V to 36V and draws only 150μA. When
V
+
is powered down, the sense pins are biased off. This
prevents loading of the monitored circuit, irrespective of
the sense voltage. The LT6105 is available in a 6-lead DFN
and 8-lead MSOP package.
the sense voltage. The LT6105 is available in a 6-lead DFN
and 8-lead MSOP package.
Gain Error vs Input Voltage
n
Very Wide, Over-the-Top
®
, Input Common Mode Range
- Extends 44V Above V
–
(Independent of V
+
)
- Extends –0.3V Below V
–
n
Wide Power Supply Range: 2.85V to 36V
n
Input Offset Voltage: 300μV Maximum
n
Gain Accuracy: 1% Max
n
Gain Confi gurable with External Resistors
n
Operating Current: 150μA
n
Slew Rate: 2V/μs
n
Sense Input Current When Powered Down: 1nA
n
Full-Scale Output Current: 1mA Minimum
n
Operating Temperature Range –40°C to 125°C
n
Available in 2mm
× 3mm DFN and 8-Lead MSOP
Packages
n
High Side or Low Side Current Sensing
n
Current Monitoring on Positive or Negative Supply
Voltages
n
Battery Monitoring
n
Fuse/MOSFET Monitoring
n
Automotive
n
Power Management
n
Portable Test/Measurement Systems
Gain of 50 Current Sense Amplifi er
–
+
0.02Ω
R
IN2
100Ω
R
IN1
100Ω
R
OUT
4.99k
LT6105
2.85V TO 36V
TO LOAD
SOURCE
–0.3V TO 44V
V
OUT
= 1V/A
V
OUT
V
+
V
–
V
S
+
V
S
–
–IN
+IN
6105 TA01
V
V
V
R
R
A
R
R
R
R
OUT
S
S
OUT
IN
V
OUT
IN
IN
IN
=
−
(
)
=
=
+
−
•
;
;
1
2
== R
IN
, LT, LTC, LTM and Over-the-Top are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
V
S
+
INPUT VOLTAGE (V)
0
GAIN ERROR (%)
2
3
35
1
0
10
20
5
15
25
40
30
45
–3
–4
–1
4
–2
6105 TA01b
T
A
= 25°C
T
A
= 85°C
T
A
= 125°C
V
+
= 12V
V
SENSE
= 50mV
R
IN
= 100Ω
A
V
= 50V
T
A
= – 40°C