LT6100
Precision, Gain Selectable
High Side Current Sense
Amplifier
DESCRIPTIO
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 ex-
tends 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 excess
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.
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
Input Offset Voltage: 300
µ
V (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
APPLICATIO S
■
■
■
■
Battery Monitoring
Fuse Monitoring
Portable and Cellular Phones
Portable Test/Measurement Systems
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
4.4V TO 48V
SUPPLY
LT6100
+
8 V
S
0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff
3V
Input Offset Voltage
vs V
S
Sense Input Voltage
1.5
V
SENSE
= 100mV
V
CC
= 3V
T
A
= 25°C
V
CC
A4
A2
INPUT OFFSET VOLTAGE (mV)
2
7
6
1.0
0.5
0
–0.5
–1.0
–1.5
R
SENSE
3mΩ
–
1 V
S
V
EE
4
CONFIGURED FOR GAIN = 25V/V
V
OUT
5
V
OUT
= 2.5V
I
SENSE
= 33A
LOAD
FIL
3
220pF
6100 TA01a
0
5
U
U
U
10 15 20 25 30 35 40 45 50
V
S
SENSE INPUT VOLTAGE (V)
6100 TA01b
6100fb
1
LT6100
ABSOLUTE
AXI U
RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
S –
1
V
CC
2
FIL 3
V
EE
4
9
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
ORDER PART NUMBER
LT6100CDD
LT6100IDD
LT6100HDD
DD PART MARKING*
LBMW
LBMW
LBMW
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
The
●
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
Temperature Coefficient of V
OS
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
I
OUT
= 0
(Note 6)
●
●
●
●
●
●
2
U
U
W
W W
U
W
(Notes 1, 2)
Specified Temperature Range (Note 5)
LT6100C ............................................. – 40°C to 85°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
TOP VIEW
V
S–
1
V
CC
2
FIL 3
V
EE
4
8
7
6
5
V
S+
A4
A2
V
OUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
ORDER PART NUMBER
LT6100CMS8
LT6100IMS8
LT6100HMS8
MS PART MARKING*
LTBMV
LTBMV
LTBMV
MIN
4.1
110
300
–300
–500
–350
–550
TYP
MAX
48
UNITS
V
mV
mV
µV
µV
µV
µV
µV/°C
6100fb
±80
±80
0.5
300
500
350
550
3
LT6100
ELECTRICAL CHARACTERISTICS
The
●
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
A
V
PARAMETER
Gain, V
OUT
/V
SENSE
CONDITIONS
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
●
MIN
9.95
9.94
9.90
9.90
TYP
MAX
10.05
10.06
10.10
10.10
UNITS
V/V
V/V
V/V
V/V
Output Voltage Gain Error (Note 7)
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
●
●
●
–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
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
V
CC
Supply Current
Slew Rate (Note 8)
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
Output High (Referred to V
CC
)
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
●
36
V
kHz
kHz
µs
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
●
●
●
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
●
●
●
●
●
●
●
30
25
125
150
250
400
1
mV
mV
mV
mV
mV
mV
µA
I
S+
, I
S–
(Off) Sense Input Current (Power Down) V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
The
●
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
Temperature Coefficient of V
OS
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
●
●
●
●
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
µV
µV
µV
µV
µV/°C
I
OUT
= 0
●
(Note 6)
●
6100fb
3
LT6100
ELECTRICAL CHARACTERISTICS
The
●
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
A
V
PARAMETER
Gain, V
OUT
/V
SENSE
CONDITIONS
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
●
MIN
9.95
9.94
9.90
9.90
TYP
MAX
10.05
10.06
10.10
10.10
UNITS
V/V
V/V
V/V
V/V
Output Voltage Gain Error (Note 7)
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
●
●
●
–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
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
Output High (Referred to V
CC
)
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
●
36
V
kHz
kHz
µs
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
●
●
●
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
●
●
●
●
●
●
●
30
25
125
150
250
400
1
mV
mV
mV
mV
mV
mV
µA
I
S+
, I
S–
(Off) Sense Input Current (Power Down) V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
The
●
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)
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
Temperature Coefficient of V
OS
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
●
●
●
●
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
µV
µV
µV
µV
µV/°C
I
OUT
= 0
●
(Note 6)
●
6100fb
4
LT6100
ELECTRICAL CHARACTERISTICS
The
●
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)
SYMBOL
A
V
PARAMETER
Gain, V
OUT
/V
SENSE
CONDITIONS
V
SENSE
= 50mV to 80mV, A
V
= 10V/V
LT6100MS8
LT6100DD8
●
MIN
9.95
9.94
9.90
9.90
TYP
MAX
10.05
10.06
10.10
10.10
UNITS
V/V
V/V
V/V
V/V
Output Voltage Gain Error (Note 7)
V
S
= 48V, V
SENSE
= 50mV to 80mV, A
V
= 10V/V
V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100MS8
LT6100DD8
V
S
= 48V, V
SENSE
= 50mV to 80mV,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
●
●
●
–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
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
Output High (Referred to V
CC
)
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
●
36
V
kHz
kHz
µs
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
●
●
●
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
●
●
●
●
●
●
●
35
25
140
160
250
400
1
mV
mV
mV
mV
mV
mV
µA
I
S+
, I
S–
(Off) Sense Input Current (Power Down) V
CC
= 0V, V
S
= 48V, V
SENSE
= 0V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
ESD (Electrostatic Discharge) sensitive devices. Extensive use of
ESD protection devices are used internal to the LT6100, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 3:
A heat sink may be required to keep the junction temperature
below absolute maximum ratings.
Note 4:
The LT6100C/LT6100I are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT6100H is
guaranteed functional over the operating temperature range of –40°C to
125°C.
Note 5:
The LT6100C is guaranteed to meet specified performance from
0°C to 70°C. The LT6100C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT6100I is guaranteed to meet
specified performance from –40°C to 85°C. The LT6100H is guaranteed to
meet specified performance from –40°C to 125°C.
Note 6:
This parameter is not 100% tested.
Note 7:
Gain error for A
V
= 12.5, 25V/V is guaranteed by the other gain
error tests.
Note 8:
Slew rate is measured on the output between 3.5V and 13.5V.
6100fb
5
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