FEATURES
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LT6100
Precision, Gain Selectable
High Side Current Sense
Amplifier
DESCRIPTION
The
LT
®
6100
is a complete micropower, precision, high
side current sense amplifier. The LT6100 monitors unidi-
rectional currents via the voltage across an external sense
resistor. Fixed gains of 10, 12.5, 20, 25, 40, 50V/V are
obtained by simply strapping or floating two gain select
pins. Gain accuracy is better than 0.5% for all gains.
The LT6100 sense inputs have a voltage range that extends
from 4.1V to 48V, and can withstand a differential voltage
of the full supply. This makes it possible to monitor the
voltage across a MOSFET switch or a fuse. The part can
also withstand a reverse battery condition on the inputs.
Input offset is a low 300µV. CMRR and PSRR are in ex-
cess of 105dB, resulting in a wide dynamic range. A filter
pin is provided to easily implement signal filtering with a
single capacitor.
The LT6100 has a separate supply input, which operates
from 2.7V to 36V and draws only 60µA. When V
CC
is
powered down, the sense pins are biased off. This pre-
vents loading of the monitored circuit, irrespective of the
sense voltage. The LT6100 is available in an 8-lead DFN
and MSOP package.
Input Offset Voltage: 300µV (Max)
Sense Inputs Up to 48V
0.5% Gain Accuracy
Pin Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V
Separate Power Supply: 2.7V to 36V
Operating Current: 60µA
Sense Input Current (V
CC
Powered Down): 1nA
Reverse Battery Protected to –48V
Buffered Output
Noise Filtering Input
–40°C to 125°C Operating Temperature Range
Available in 8-Lead DFN and MSOP Packages
APPLICATIONS
n
n
n
n
Battery Monitoring
Fuse Monitoring
Portable and Cellular Phones
Portable Test/Measurement Systems
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff
4.4V TO 48V
SUPPLY
LT6100
+
8 V
S
3V
2
V
CC
7
A4
6
INPUT OFFSET VOLTAGE (mV)
A2
Input Offset Voltage
vs V
S
Sense Input Voltage
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
V
SENSE
= 100mV
V
CC
= 3V
T
A
= 25°C
R
SENSE
3m
–
1 V
S
V
EE
4
CONFIGURED FOR GAIN = 25V/V
FIL
3
220pF
V
OUT
5
V
OUT
= 2.5V
I
SENSE
= 33A
LOAD
6100 TA01a
0
5
10 15 20 25 30 35 40 45 50
V
S
SENSE INPUT VOLTAGE (V)
6100 TA01b
6100fd
For more information
www.linear.com/LT6100
1
LT6100
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Differential Sense Voltage ...................................... ±48V
Total V
S+
, V
S –
to V
EE
............................................... 48V
Total V
CC
Supply Voltage from V
EE
......................... 36V
Output Voltage ............................... (V
EE
) to (V
EE
+ 36V)
Output Short-Circuit Duration (Note 3) ........ Continuous
Operating Temperature Range (Note 4)
LT6100C ............................................–40°C to 85°C
LT6100I ..............................................–40°C to 85°C
LT6100H .......................................... –40°C to 125°C
Specified Temperature Range (Note 5)
LT6100C ................................................ 0°C to 70°C
LT6100I ..............................................–40°C to 85°C
LT6100H .......................................... –40°C to 125°C
Storage Temperature Range ...........................................
DFN.................................................... –65°C to 125°C
MSOP ................................................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP .............................................................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
V
S–
1
V
CC
2
FIL 3
V
EE
4
9
8
7
6
5
V
S+
A4
A2
V
OUT
TOP VIEW
V
S–
1
V
CC
2
FIL 3
V
EE
4
8
7
6
5
V
S+
A4
A2
V
OUT
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) IS V
EE
, MUST BE SOLDERED TO PCB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT6100CDD#PBF
LT6100IDD#PBF
LT6100HDD#PBF
LT6100CMS8#PBF
LT6100IMS8#PBF
LT6100HMS8#PBF
TAPE AND REEL
LT6100CDD#TRPBF
LT6100IDD#TRPBF
LT6100HDD#TRPBF
LT6100CMS8#TRPBF
LT6100IMS8#TRPBF
LT6100HMS8#TRPBF
PART MARKING*
LBMW
LBMW
LBMW
LTBMV
LTBMV
LTBMV
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead Plastic MS8
8-Lead Plastic MS8
8-Lead Plastic MS8
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
6100fd
2
For more information
www.linear.com/LT6100
LT6100
The
l
denotes specifications which apply over the temperature range 0°C ≤ T
A
≤ 70°C (LT6100C), otherwise specifications are
T
A
= 25°C. V
CC
= 5V, V
EE
= 0V, V
S+
= V
CC
+ 1.4V unless otherwise specified. (Note 5)
SYMBOL
V
S–
, V
S+
V
SENSE
V
OS
PARAMETER
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
V
OS
TC
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
CONDITIONS
V
CC
= 2.7V
V
SENSE
= V
S+
– V
S–
, V
CC
= 3V, A
V
= 10V/V
V
SENSE
= V
S+
– V
S–
, V
CC
= 5V, A
V
= 10V/V
I
OUT
= 0
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
4.1
110
300
–300
–500
–350
–550
TYP
MAX
48
UNITS
V
mV
mV
±80
±80
0.5
300
500
350
550
3
10.05
10.06
10.10
10.10
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
I
OUT
= 0
l
(Note 6)
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
l
l
9.95
9.94
9.90
9.90
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
Output Voltage Gain Error (Note 7)
V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
l
l
–0.5
–0.6
–1.0
–1.0
105
100
105
100
2.7
100
20
150
50
15
4.5
60
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
120
120
120
120
0.5
0.6
1.0
1.0
%
%
%
%
dB
dB
dB
dB
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
V
S
Sense Input Common Mode
Rejection Ratio
V
CC
Supply Rejection Ratio
Supply Voltage V
CC
Bandwidth
Output Settling to 1% Final Value
V
CC
Supply Current
Slew Rate (Note 8)
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
Output High (Referred to V
CC
)
A
V
= 10V/V, f
O
= –3dB, V
CC
= 15V
A
V
= 50V/V, f
O
= –3dB, V
CC
= 15V
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V
V
CC
= 15V, V
SENSE
= 26mV to 380mV, A
V
= 50V/V
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
l
l
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
l
l
36
V
kHz
kHz
µs
I
S+(O)
, I
S–(O)
Sense Input Current
l
l
l
10
130
µA
µA
V/µs
V/µs
mA
V
I
SC+
, I
SC–
I
S(TOTAL)
= –200µA, V
CC
= Open
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No Load
A
V
= 50V/V, V
SENSE
= 100mV, I
L
= 0
V
SENSE
= 100mV, I
L
= 100µA
V
SENSE
= 100mV, I
L
= 500µA
V
SENSE
= 100mV, I
L
= 1mA
V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
l
l
l
l
l
l
l
30
25
125
150
250
400
1
mV
mV
mV
mV
mV
mV
µA
I
S+
, I
S–
(Off) Sense Input Current (Power Down)
6100fd
For more information
www.linear.com/LT6100
3
LT6100
The
l
denotes specifications which apply over the temperature range –40°C ≤ T
A
≤ 85°C (LT6100I), otherwise specifications are
T
A
= 25°C. V
CC
= 5V, V
EE
= 0V, V
S+
= V
CC
+ 1.4V unless otherwise specified. (Note 5)
SYMBOL
V
S–
, V
S+
V
SENSE
V
OS
PARAMETER
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
V
OS
TC
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
CONDITIONS
V
CC
= 2.7V
V
SENSE
= V
S+
– V
S–
, V
CC
= 3V, A
V
= 10V/V
V
SENSE
= V
S+
– V
S–
, V
CC
= 5V, A
V
= 10V/V
I
OUT
= 0
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
4.1
110
300
–300
–550
–350
–600
TYP
MAX
48
UNITS
V
mV
mV
±80
±80
0.5
300
550
350
600
3
10.05
10.06
10.10
10.10
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
I
OUT
= 0
l
(Note 6)
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
l
l
9.95
9.94
9.90
9.90
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
Output Voltage Gain Error (Note 7)
V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
l
l
–0.5
–0.6
–1.0
–1.0
105
100
105
100
2.7
100
20
150
50
15
4.5
60
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
120
120
120
120
0.5
0.6
1.0
1.0
%
%
%
%
dB
dB
dB
dB
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
S+(O)
, I
S–(O)
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
V
S
Sense Input Common Mode
Rejection Ratio
V
CC
Supply Rejection Ratio
Supply Voltage V
CC
Bandwidth
Output Settling to 1% Final Value
Sense Input Current
Supply Current
Slew Rate (Note 8)
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
A
V
= 10V/V, f
O
= –3dB, V
CC
= 15V
A
V
= 50V/V, f
O
= –3dB, V
CC
= 15V
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V
V
CC
= 15V, V
SENSE
= 26mV to 380mV, A
V
= 50V/V
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
l
l
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
l
l
36
V
kHz
kHz
µs
l
l
l
10
145
µA
µA
V/µs
V/µs
mA
V
I
SC+
, I
SC–
I
S(TOTAL)
= –200µA, V
CC
= Open
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No
Load
A
V
= 50V/V, V
SENSE
= 100mV, I
L
= 0
V
SENSE
= 100mV, I
L
= 100µA
V
SENSE
= 100mV, I
L
= 500µA
V
SENSE
= 100mV, I
L
= 1mA
V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
l
l
30
25
125
150
250
400
1
mV
mV
mV
mV
mV
mV
µA
Output High (Referred to V
CC
)
l
l
l
l
l
I
S+
, I
S–
(Off)
Sense Input Current (Power Down)
6100fd
4
For more information
www.linear.com/LT6100
LT6100
ELECTRICAL CHARACTERISTICS
SYMBOL
V
S–
, V
S+
V
SENSE
V
OS
PARAMETER
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
V
OS
TC
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
The
l
denotes specifications which apply over the temperature range –40°C ≤ T
A
≤ 125°C (LT6100H), otherwise specifications are
T
A
= 25°C. V
CC
= 5V, V
EE
= 0V, V
S+
= V
CC
+ 1.4V unless otherwise specified. (Note 5)
CONDITIONS
V
CC
= 2.7V
V
SENSE
= V
S+
– V
S–
, V
CC
= 3V, A
V
= 10V/V
V
SENSE
= V
S+
– V
S–
, V
CC
= 5V, AV = 10V/V
I
OUT
= 0
l
l
l
l
MIN
4.1
110
300
–300
–600
–350
–650
TYP
MAX
48
UNITS
V
mV
mV
±80
±80
0.5
300
600
350
650
5
10.05
10.06
10.10
10.10
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
I
OUT
= 0
l
(Note 6)
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
l
l
9.95
9.94
9.90
9.90
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
Output Voltage Gain Error (Note 7)
V
SENSE
= 50mV to 80mV,
AV = 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
l
l
–0.5
–0.6
–1.0
–1.0
105
100
105
95
2.7
100
20
150
50
15
4.5
60
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
120
120
120
120
0.5
0.6
1.0
1.0
%
%
%
%
dB
dB
dB
dB
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
S+(O)
, I
S–(O
)
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
V
S
Sense Input Common Mode
Rejection Ratio
V
CC
Supply Rejection Ratio
Supply Voltage V
CC
Bandwidth
Output Settling to 1% Final Value
Sense Input Current
Supply Current
Slew Rate (Note 8)
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
A
V
= 10V/V, f
O
= –3dB, V
CC
= 15V
A
V
= 50V/V, f
O
= –3dB, V
CC
= 15V
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V
V
CC
= 15V, V
SENSE
= 26mV to 380mV, A
V
= 50V/V
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
l
l
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
l
l
36
V
kHz
kHz
µs
l
l
l
10
170
µA
µA
V/µs
V/µs
mA
V
I
SC+
, I
SC–
I
S(TOTAL)
= –200µA, V
CC
= Open
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No
Load
A
V
= 50V/V, V
SENSE
= 100mV, I
L
= 0
V
SENSE
= 100mV, I
L
= 100µA
V
SENSE
= 100mV, I
L
= 500µA
V
SENSE
= 100mV, I
L
= 1mA
V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
l
l
35
25
140
160
250
400
1
mV
mV
mV
mV
mV
mV
µA
Output High (Referred to V
CC
)
l
l
l
l
l
I
S+
, I
S–
(Off)
Sense Input Current (Power Down)
6100fd
For more information
www.linear.com/LT6100
5
测试/测量
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