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
, LTC and LT 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
6100f
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
ORDER PART
NUMBER
TOP VIEW
LT6100CDD
LT6100IDD
LT6100HDD
DD PART MARKING*
LBMW
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
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
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
CONDITIONS
Single Supply Operation (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, V
CC
= 5V
I
OUT
= 0, V
CC
= 5V
V
CC
= 5V (Note 6)
V
SENSE
= 50mV to 80mV, V
CC
Supply = 5V, A
V
= 10V/V
LT6100DD8
●
●
●
●
●
●
●
V
S
= 48V
Output Voltage Gain Error (Note 7)
V
SENSE
= 50mV to 80mV, V
CC
Supply = 5V,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100DD8
V
S
= 48V
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
ORDER PART
NUMBER
V
S–
1
V
CC
2
FIL 3
V
EE
4
8
7
6
5
V
S+
A4
A2
V
OUT
LT6100CMS8
LT6100IMS8
LT6100HMS8
MS PART MARKING*
LTBMV
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
MIN
4.1
110
300
–300
–500
–350
–550
9.95
9.94
9.90
9.9
–0.5
●
●
TYP
MAX
48
UNITS
V
mV
mV
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
%
%
%
%
6100f
±80
±80
0.5
10
10
10
10
300
500
350
550
3
10.05
10.06
10.10
10.10
0.5
0.6
1.0
1.0
●
–0.6
–1.0
–1.0
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
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
PARAMETER
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
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
Output High
A
V
= 10V/V, f
O
= –3dB
A
V
= 50V/V, f
O
= –3dB
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V, V
CC
= 5V
V
CC
= 15V, V
SENSE
= 50mV to 300mV, A
V
= 50V/V
●
●
●
CONDITIONS
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
MIN
105
100
105
100
2.7
100
20
TYP
120
120
120
120
MAX
UNITS
dB
dB
dB
dB
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
36
150
50
15
4.5
60
10
130
V
kHz
kHz
µs
µA
µA
V/µs
V/µs
mA
V
I
S+(O)
, I
S–(O)
Sense Input Current
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
30
25
125
150
250
400
1
I
SC+
, I
SC–
I
S
= –100µA
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No Load
V
CC
= 5V, 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
●
●
●
●
●
●
●
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
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
CONDITIONS
Single Supply Operation (V
CC
= 2.7V)
V
SENSE
= V
S
– V
S–
, V
CC
= 3V, A
V
V
SENSE
= V
S+
– V
S–
, V
CC
= 5V, A
V
I
OUT
= 0, V
CC
= 5V
●
+
MIN
●
●
●
TYP
MAX
48
UNITS
V
mV
mV
4.1
110
300
–300
–550
–350
–600
9.95
9.94
9.90
9.9
–0.5
–0.6
–1.0
–1.0
±80
±80
0.5
10
10
10
10
= 10V/V
= 10V/V
300
550
350
600
3
10.05
10.06
10.10
10.10
0.5
0.6
1.0
1.0
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
%
%
%
%
I
OUT
= 0, V
CC
= 5V
●
V
CC
= 5V (Note 6)
V
SENSE
= 50mV to 80mV, V
CC
= 5V, A
V
= 10V/V
LT6100DD8
●
●
Output Voltage Gain Error (Note 7)
V
S
= 48V
V
SENSE
= 50mV to 80mV, V
CC
= 5V,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100DD8
V
S
= 48V
●
●
●
6100f
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
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
PARAMETER
V
S
Sense Input Common Mode
Rejection Ratio
V
CC
Supply Rejection Ratio
Supply Voltage V
CC
Bandwidth
Output Settling to 1% Final Value
Supply Current
Slew Rate
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
Output High
A
V
= 10V/V, f
O
= –3dB
A
V
= 50V/V, f
O
= –3dB
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V, V
+
Supply = 5V
V
CC
= 15V, V
SENSE
= 50mV to 300mV, A
V
= 50V/V
●
●
●
CONDITIONS
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
MIN
105
100
105
100
2.7
100
20
TYP
120
120
120
120
MAX
UNITS
dB
dB
dB
dB
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
36
150
50
15
4.5
60
10
145
V
kHz
kHz
µs
µA
µA
V/µs
V/µs
mA
V
I
S+(O)
, I
S–(O)
Sense Input Current
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
30
25
125
150
250
400
1
I
SC+
, I
SC–
I
S
= –100µA
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No Load
V
CC
= 5V, 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
●
●
●
●
●
●
●
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
A
V
Temperature Coefficient of V
OS
Gain, V
OUT
/V
SENSE
CONDITIONS
Single Supply Operation (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, V
CC
= 5V
●
●
●
●
MIN
4.1
110
300
–300
–600
–350
–650
9.95
9.94
9.90
9.9
–0.5
●
TYP
MAX
48
UNITS
V
mV
mV
±80
±80
0.5
10
10
10
10
300
600
350
650
5
10.05
10.06
10.10
10.10
0.5
0.6
1.0
1.0
µV
µV
µV
µV
µV/°C
V/V
V/V
V/V
V/V
%
%
%
%
I
OUT
= 0, V
CC
= 5V
●
V
CC
= 5V (Note 6)
V
SENSE
= 50mV to 80mV, V
CC
= 5V, A
V
= 10V/V
LT6100DD8
●
●
V
S
= 48V
Output Voltage Gain Error (Note 7)
V
SENSE
= 50mV to 80mV, V
CC
= 5V,
A
V
= 10, 12.5, 20, 25, 40, 50V/V
LT6100DD8
V
S
= 48V
●
●
–0.6
–1.0
–1.0
6100f
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
V
S
CMRR
V
CC
PSRR
V
CC
BW
t
S
I
CC(O)
SR
I
SC
V
O(MIN)
V
O(MAX)
PARAMETER
V
S
Sense Input Common Mode
Rejection Ratio
V
CC
Supply Rejection Ratio
Supply Voltage V
CC
Bandwidth
Output Settling to 1% Final Value
Supply Current
Slew Rate
Short-Circuit Current
Reverse V
S
Supply
Minimum Output Voltage
Output High
A
V
= 10V/V, f
O
= –3dB
A
V
= 50V/V, f
O
= –3dB
V
SENSE
= 10mV to 100mV
V
SENSE
= 0V
V
SENSE
= 0V, V
CC
= 5V
V
CC
= 15V, V
SENSE
= 50mV to 300mV, A
V
= 50V/V
●
●
●
CONDITIONS
V
SENSE
= 50mV, V
CC
= 2.7V, V
S
= 4.1V to 36V
●
MIN
105
100
105
95
2.7
100
20
TYP
120
120
120
120
MAX
UNITS
dB
dB
dB
dB
V
SENSE
= 50mV, V
S
= 36V, V
CC
= 3V to 30V
●
36
150
50
15
4.5
60
10
170
V
kHz
kHz
µs
µA
µA
V/µs
V/µs
mA
V
I
S+(O)
, I
S–(O)
Sense Input Current
0.03
0.02
8
50
0.05
0.05
15
60
15
15
75
85
125
175
0.001
35
25
140
160
250
400
1
I
SC+
, I
SC–
I
S
= –100µA
V
SENSE
= 0V, No Load
V
SENSE
= V
S+
– V
S–
= –100mV, A
V
= 50V/V, No Load
V
CC
= 5V, 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
●
●
●
●
●
●
●
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:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 other gain
error test.
6100f
5
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