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LT6105IMS8#PBF

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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
–
). 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 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.
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.
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
VVV
R
R
A
R
R
RR
OUT S S
OUT
IN
V
OUT
IN
IN IN
=−
()
==
+−
•; ;
12
== 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
LT6105
2
6105fa
ABSOLUTE MAXIMUM RATINGS
Differential Input Voltage (+IN – –IN) .....................±44V
Input Voltage V(+IN, –IN) to V
–
................ –9.5V to 44V
Total V
+
Supply Voltage from V
–
...............................36V
Output Voltage ......................................V
–
to (V
–
+ 36V)
Output Short-Circuit Duration (Note 3) ............ Indefi nite
Operating Temperature Range (Note 4)
LT6105C ...............................................–40°C to 85°C
LT6105I ................................................–40°C to 85°C
LT6105H ............................................–40°C to 125°C
(Notes 1, 2)
TOP VIEW
+IN
NC
V
OUT
–IN
V
+
V
–
DCB PACKAGE
6-LEAD (2mm s 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 150°C, θ
JA
= 64°C/W
EXPOSED PAD (PIN 7) CONNECTED TO V
–
(PIN 3)
1
2
3
4
–IN
V
+
NC
V
–
8
7
6
5
+IN
NC
NC
V
OUT
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 250°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6105CDCB#TRMPBF
LT6105IDCB#TRMPBF
LT6105HDCB#TRMPBF
LT6105CDCB#TRPBF
LT6105IDCB#TRPBF
LT6105HDCB#TRPBF
LCTF
LCTF
LCTF
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LT6105CMS8#PBF
LT6105IMS8#PBF
LT6105HMS8#PBF
LT6105CMS8#TRPBF
LT6105IMS8#TRPBF
LT6105HMS8#TRPBF
LT CT D
LT CT D
LT CT D
8-Lead Plastic MS8
8-Lead Plastic MS8
8-Lead Plastic MS8
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
Specifi ed Temperature Range (Note 5)
LT6105C ................................................... 0°C to 70°C
LT6105I ................................................–40°C to 85°C
LT6105H ............................................–40°C to 125°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
LT6105
3
6105fa
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
S
+
, V
S
–
Input Voltage Range Guaranteed by CMRR
l
–0.3
–0.1
44
44
V
V
A
V
Error Voltage Gain Error (Note 6) V
SENSE
= 25mV to 75mV, V
S
+
= 12V
l
–1
–1.3
0.1 1
1.3
%
%
V
SENSE
= 25mV to 75mV, V
S
+
= 0V
l
–2.5 2.5 %
V
OS
Input Offset Voltage
MS8 Package
V
SENSE
= 5mV
l
–0.3
–0.6
–0.1 0.3
0.6
mV
mV
Input Offset Voltage
DCB Package
V
SENSE
= 5mV
l
–0.4
–0.7
–0.1 0.4
0.7
mV
mV
Input Offset Voltage V
SENSE
= 5mV, V
S
+
= 0V
l
–1
–1.3
–0.3 1
1.3
mV
mV
ΔV
OS
/ΔT
Temperature Coeffi cient of V
OS
l
0.5 μV/°C
CMRR Input Common Mode
Rejection Ratio
V
SENSE
= 5mV, V
S
+
= 2.8V to 44V
l
100
95
120 dB
dB
V
SENSE
= 5mV, V
S
+
= –0.3V to 44V
V
SENSE
= 5mV, V
S
+
= –0.1V to 44V
l
94
90
dB
dB
V
+
Power Supply Voltage Range Guaranteed by PSRR
l
2.85 36 V
PSRR Power Supply Rejection Ratio V
SENSE
= 5mV, V
S
+
= 12V, V
+
= 2.85V to 36V
l
98
94
120 dB
dB
V
SENSE
= 5mV, V
S
+
= 0V, V
+
= 2.85V to 36V
l
98
94
120 dB
dB
I
(+IN)
, I
(–IN)
Input Current V
SENSE
= 0V, V
S
+
= 3V
V
SENSE
= 0V, V
S
+
= 0V
l
l
15
–0.05
25 μA
μA
I
(+IN)
– I
(–IN)
Input Offset Current V
SENSE
= 0V, V
S
+
= 3V
V
SENSE
= 0V, V
S
+
= 0V
l
l
0.05
0.005
0.5 μA
μA
I
(+IN) +
I
(–IN)
Input Current (Power-Down) V
+
= 0V, V
S
+
= 44V, V
SENSE
= 0V
l
0.03 1 μA
I
S
V
+
Supply Current V
SENSE
= 0V, V
S
+
= 3V, V
+
= 2.85V
V
SENSE
= 0V, V
S
+
= 3V, V
+
= 36V
l
l
200
240
300
350
μA
μA
V
O(MIN)
Minimum Output Voltage V
SENSE
= 0mV, V
S
+
= 44V, V
+
= 36V
l
35 mV
V
O(MAX)
Output High (Referred to V
+
)V
SENSE
= 120mV, A
V
= 100, R
OUT
= 10k
l
1.25 1.5 V
I
OUT
Maximum Output Current Guaranteed by V
O(MAX)
l
1mA
I
SC
Short-Circuit Output Current V
S
+
= 44V, V
S
–
= 0V, R
OUT
= 0Ω
l
1.5 mA
BW –3dB Bandwidth V
SENSE
= 50mV, A
V
= 10V/V 100 kHz
t
S
Output Settling to 1% of Final Value V
SENSE
= 5mV to 100mV 5 μs
t
r
Input Step Response (Note 7) V
SENSE
= 5mV to 100mV 3 μs
SR Slew Rate (Note 8) V
SENSE
= 5mV to 150mV, A
V
= 50V/V, R
IN
= 400Ω 1.75 2 V/μs
V
REV
Reverse Input Voltage
(Referred to V
–
)
I
(+IN) +
I
(–IN)
= –5mA
l
–9.5 –12 V
The l denotes the specifi cations which apply over the temperature range
0°C < T
A
< 70°C (LT6105C), otherwise specifi cations are at T
A
= 25°C. V
+
= 12V, V
–
= 0V, V
S
+
= 12V (see Figure 1), R
IN1
= R
IN2
= 100Ω,
R
OUT
= 5k (A
V
= 50), V
SENSE
= V
S
+
– V
S
–
, unless otherwise specifi ed. (Note 5)
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LT6105IMS8#PBF

Mfr. #:
Buy LT6105IMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers High Side current Sense with -03V to 44v Common Mock
Lifecycle:
New from this manufacturer.
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