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PDF LT6105 Data sheet ( Hoja de datos )
| Número de pieza | LT6105 | |
| Descripción | Rail-to-Rail Input Current Sense Amplifier | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LT6105
Precision, Extended Input
Range Current Sense Amplifier
FEATURES
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
www.DataShneetI4nUp.cuotmOffset Voltage: 300μV Maximum
n Gain Accuracy: 1% Max
n Gain Configurable 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
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
amplifier 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–). 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 configured 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 minimum 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 Amplifier
SOURCE
–0.3V TO 44V
VS+
RIN2
100Ω
0.02Ω
VS–
RIN1
100Ω
+IN +
–IN –
V+
LT6105
VOUT
V–
VOUT = 1V/A
ROUT
4.99k
TO LOAD
2.85V TO 36V
6105 TA01
( )VOUT =
VS+ − VS−
• 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 = – 40°C
0 TA = 25°C
–1
–2 TA = 125°C TA = 85°C
–3
–4
0
5 10 15 20 25 30 35 40 45
VS+ INPUT VOLTAGE (V)
6105 TA01b
6105f
1
1 page  
LT6105
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range
–40°C
100Ω,
<RTOAUT<=152k5°(CAV(L=T65100),5HV)S,ENoSthEe=rwViSs+e–sVpeS–c,ifiucnaletisosnostahreerwatisTeA
= 25°C. V+ = 12V, V
specified. (Note 5)
–
=
0V,
VS+
=
12V
(see
Figure
1),
RIN1
=
RIN2
=
SYMBOL
VS+, VS–
AV Error
PARAMETER
Input Voltage Range
Voltage Gain Error (Note 6)
CONDITIONS
Guaranteed by CMRR
VSENSE = 25mV to 75mV, VS+ = 12V
VSENSE = 25mV to 75mV, VS+ = 0V
MIN TYP MAX UNITS
–0.3
l –0.1
44 V
44 V
–1
l –1.5
0.1
1
1.5
%
%
l –3.25
3.25 %
VOS
www.DataSheet4U.com
Input Offset Voltage
MS8 Package
Input Offset Voltage
DCB Package
VSENSE = 5mV
VSENSE = 5mV
–0.3
l –0.8
–0.4
l –0.9
–0.1
–0.1
0.3
0.8
0.4
0.9
mV
mV
mV
mV
Input Offset Voltage
VSENSE = 5mV, VS+ = 0V
–1
l –1.6
–0.3
1
1.6
mV
mV
ΔVOS /ΔT
CMRR
V+
PSRR
Temperature Coefficient of VOS
Input Common Mode
Rejection Ratio
Power Supply Voltage Range
Power Supply Rejection Ratio
VSENSE = 5mV, VS+ = 2.8V to 44V
VSENSE
VSENSE
=
=
5mV,
5mV,
VVSS++
=
=
–0.3V
–0.1V
to
to
44V
44V
Guaranteed by PSRR
VSENSE = 5mV, VS+ = 12V, V+ = 2.85V to 36V
VSENSE = 5mV, VS+ = 0V, V+ = 2.85V to 36V
I(+IN), I(–IN)
I(+IN) – I(–IN)
I(+IN) + I(–IN)
IS
VO(MIN)
VO(MAX)
IOUT
ISC
BW
tS
tr
SR
VREV
Input Current
Input Offset Current
Input Current (Power-Down)
V+ Supply Current
Minimum Output Voltage
Output High (Referred to V+)
Maximum Output Current
Short-Circuit Output Current
–3dB Bandwidth
Output Settling to 1% of Final Value
Input Step Response (Note 7)
Slew Rate (Note 8)
Reverse Input Voltage
(Referred to V –)
VSENSE
VSENSE
=
=
0V,
0V,
VVSS++
=
=
3V
0V
VSENSE
VSENSE
=
=
0V,
0V,
VVSS++
=
=
3V
0V
V+ = 0V, VS+ = 44V, VSENSE = 0V
VSENSE
VSENSE
=
=
0V,
0V,
VVSS++
=
=
3V,
3V,
V+
V+
=
=
2.85V
36V
VSENSE = 0mV, VS+ = 44V, V+ = 36V
VSENSE = 120mV, AV = 100, RL = 10k
Guaranteed by VO(MAX)
VS+ = 44V, VS– = 0V, ROUT = 0Ω
VSENSE = 50mV, AV = 10V/V
VSENSE = 5mV to 100mV
VSENSE = 5mV to 100mV
VSENSE = 5mV to 150mV, AV = 50V/V, RIN = 400Ω
I(+IN) + I(–IN) = –5mA
l
100
l 95
94
l 80
l 2.85
98
l 94
98
l 94
l
l
l
l
l
l
l
l
l
l1
l 1.5
1.75
l –9
0.5
120
120
120
18
–0.05
0.35
0.1
0.5
240
300
1.3
100
5
3
2.25
–12
36
30
0.8
2.5
350
450
45
1.7
μV/°C
dB
dB
dB
dB
V
dB
dB
dB
dB
μA
μA
μA
μA
μA
μA
μA
mV
V
mA
mA
kHz
μs
μs
V/μs
V
6105f
5
5 Page 
LT6105
PIN FUNCTIONS (DCB/MS8)
–IN (Pin 1/Pin 1): Negative Sense Input Terminal.
Negative sense voltage input will remain functional for
voltages up to 44V, referred to V–. Connect –IN to an
external gain-setting resistor RIN1 (RIN1 = RIN2) to set
the gain.
V+ (Pin 2/Pin 2): Power Supply Voltage. This pin supplies
current to the amplifier and can operate from 2.85V to 36V,
independent of the voltages on the –IN or +IN pins.
www.DataShVee–t4(PU.icno3m/Pin 4): Negative Power Supply Voltage or Ground
for Single Supply Operation.
VOUT (Pin 4/Pin 5): Voltage Output:
VOUT = AV • (VSENSE ± VOS)
VOS is the input offset voltage. AV is the gain set by exter-
nal RIN1, RIN2, ROUT. AV = ROUT/RIN1, for RIN1 = RIN2.
NC (Pin 5/Pins 3, 6, 7): Not Connected Internally.
+IN (Pin 6/Pin 8): Positive Sense Input Terminal.
Connecting a source to VS+ and a load to VS– will allow the
LT6105 to monitor the current through RSENSE, refer to
Figure 1. Connect +IN to an external gain-setting resistor
RIN2 to set the gain. +IN remains functional for voltages
up to 44V, referred to V–.
Exposed Pad (Pin 7) DFN Only: V–. The Exposed Pad is
connected to the V– pin. It should be connected to the
V– trace of the PCB, or left floating.
BLOCK DIAGRAM
TO LOAD
VSENSE
VS– RSENSE VS+
RIN1
RIN2
SOURCE
0V TO 44V
V+
Q2 Q3
–IN +IN
+
A1
–
+
A2
–
LT6105
SET RIN1 = RIN2 FOR BEST ACCURACY
IF RIN1 ≠ RIN2, THEN
V(–IN) > 1.6V:
VOUT = VSENSE •
ROUT
RIN2
V(–IN) < 1.6V:
VOUT
=
VSENSE
•
ROUT
RIN1
RIN1, RIN2, ROUT ARE EXTERNAL RESISTORS
Q1
V–
VOUT
VOUT
=
VSENSE
•
ROUT
RIN
WHERE RIN = RIN1 = RIN2
6105 F01
ROUT
AV =
ROUT
RIN
Figure 1. Simplified Block Diagram
6105f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT6105.PDF ] | |
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