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LT6105 Datasheet, PDF (1/20 Pages) Linear Technology – Precision, Extended Input Range Current Sense Amplifi er | |||
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LT6105
Precision, Extended Input
Range Current Sense Ampliï¬er
FEATURES
n Very Wide, Over-the-Top®, Input Common Mode Range
- Extends 44V Above Vâ (Independent of V+)
- Extends â0.3V Below Vâ
n Wide Power Supply Range: 2.85V to 36V
n Input Offset Voltage: 300μV Maximum
n Gain Accuracy: 1% Max
n Gain Conï¬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 â40°C to 125°C
n Available in 2mm à 3mm DFN and 8-Lead MSOP
Packages
APPLICATIONS
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
DESCRIPTION
The LT®6105 is a micropower, precision current sense
ampliï¬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 â0.3V to 44V, with respect to
the negative supply voltage (Vâ). 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.
Gain is conï¬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.
The LT6105 can operate from an independent power
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.
, LT, LTC, LTM and Over-the-Top are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Gain of 50 Current Sense Ampliï¬er
SOURCE
â0.3V TO 44V
VS+
RIN2
100Ω
0.02Ω
VSâ
RIN1
100Ω
+IN +
âIN â
V+
LT6105
VOUT
Vâ
VOUT = 1V/A
ROUT
4.99k
TO LOAD
2.85V TO 36V
6105 TA01
( ) VOUT =
VS+ â VSâ
⢠ROUT ;
RIN
AV
=
ROUT
RIN
;
RIN1 = RIN2 = RIN
Gain Error vs Input Voltage
4 V+ = 12V
3
VSENSE = 50mV
RIN = 100Ω
2 AV = 50V
1
TA = â 40°C
0
TA = 25°C
â1
â2 TA = 125°C TA = 85°C
â3
â4
0
5 10 15 20 25 30 35 40 45
VS+ INPUT VOLTAGE (V)
6105 TA01b
6105fa
1
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