LT6100CMS8 [Linear]
Precision, Gain Selectable High Side Current Sense Amplifier; 精密，增益可选高压侧电流检测放大器
| 型号： | LT6100CMS8 |
| 厂家： | 
Linear |
| 描述： | Precision, Gain Selectable High Side Current Sense Amplifier |
| 文件： | 总16页 (文件大小：258K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT6100
Precision, Gain Selectable
High Side Current Sense
Amplifier
U
FEATURES
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.
■
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 (VCC Powered Down): 1nA
Reverse Battery Protected to –48V
Buffered Output
The LT6100 sense inputs have a voltage range that ex-
tends from 4.1V to 48V, and can withstand a differential
voltageofthefullsupply.Thismakesitpossibletomonitor
thevoltageacrossaMOSFETswitchorafuse.Thepartcan
also withstand a reverse battery condition on the inputs.
Noise Filtering Input
–40°C to 125°C Operating Temperature Range
Available in 8-Lead DFN and MSOP Packages
U
Inputoffsetisalow300µV. CMRRandPSRRareinexcess
of 105dB, resulting in a wide dynamic range. A filter pin is
provided to easily implement signal filtering with a single
capacitor.
APPLICATIO S
■
Battery Monitoring
Fuse Monitoring
Portable and Cellular Phones
Portable Test/Measurement Systems
■
■
The LT6100 has a separate supply input, which operates
from 2.7V to 36V and draws only 60µA. When VCC 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.
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U
TYPICAL APPLICATIO
Input Offset Voltage
vs VS Sense Input Voltage
0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff
1.5
4.4V TO 48V
SUPPLY
3V
V
V
A
= 100mV
SENSE
CC
= 3V
2
7
6
1.0
T
= 25°C
V
A4
A2
LT6100
+
CC
0.5
0
V
S
8
1
V
OUT
5
R
V
= 2.5V
SENSE
OUT
3mΩ
I
= 33A
SENSE
–0.5
–1.0
–1.5
–
V
S
V
4
EE
FIL
3
220pF
LOAD
6100 TA01a
0
5
10 15 20 25 30 35 40 45 50
CONFIGURED FOR GAIN = 25V/V
V
SENSE INPUT VOLTAGE (V)
S
6100 TA01b
6100f
1
LT6100
ABSOLUTE AXI U RATI GS (Notes 1, 2)
W W U W
Differential Sense Voltage..................................... ±48V
Specified Temperature Range (Note 5)
+
Total VS , VS– to VEE ............................................... 48V
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)
Total VCC Supply Voltage from VEE ......................... 36V
Output Voltage............................... (VEE) to (VEE + 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
MSOP .............................................................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
TOP VIEW
NUMBER
–
+
TOP VIEW
V
V
1
2
3
4
8
7
6
5
V
S
S
–
+
LT6100CDD
LT6100IDD
LT6100HDD
LT6100CMS8
LT6100IMS8
LT6100HMS8
V
V
1
2
3
4
8 V
S
A4
A2
V
S
CC
9
7 A4
6 A2
5 V
CC
FIL
EE
FIL
V
V
EE
OUT
OUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PART MARKING*
LBMW
MS PART MARKING*
LTBMV
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 250°C/ W
TJMAX = 125°C, θJA = 43°C/ W
EXPOSED PAD (PIN 9) IS VEE
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 ≤ TA ≤ 70°C (LT6100C), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
Single Supply Operation (V = 2.7V)
MIN
TYP
MAX
UNITS
–
+
V
V
, V
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
●
4.1
48
V
S
S
CC
+
–
V
V
= V – V , V = 3V, A = 10V/V
●
●
110
300
mV
mV
SENSE
SENSE
SENSE
S
S
CC
V
+
–
= V – V , V = 5V, A = 10V/V
S
S
CC
V
V
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
I
= 0, V = 5V
–300
–500
±80
±80
0.5
300
500
µV
µV
µV
µV
OS
OUT
CC
●
I
= 0, V = 5V
–350
–550
350
550
OUT
CC
●
●
V
A
TC
Temperature Coefficient of V
V
V
= 5V (Note 6)
3
µV/°C
OS
V
OS
CC
Gain, V /V
= 50mV to 80mV, V Supply = 5V, A = 10V/V
9.95
9.94
9.90
10
10
10
10.05
10.06
10.10
V/V
V/V
V/V
OUT SENSE
SENSE
CC
V
LT6100DD8
●
●
V = 48V
9.9
10
10.10
0.5
V/V
%
S
Output Voltage Gain Error (Note 7)
V
= 50mV to 80mV, V Supply = 5V,
–0.5
SENSE
CC
A = 10, 12.5, 20, 25, 40, 50V/V
V
LT6100DD8
–0.6
–1.0
0.6
1.0
%
%
●
●
V = 48V
–1.0
1.0
%
S
6100f
2
LT6100
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C (LT6100C), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
V CMRR
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V Sense Input Common Mode
V
= 50mV, V = 2.7V, V = 4.1V to 36V
105
100
120
120
dB
dB
S
S
SENSE
CC
S
Rejection Ratio
●
●
V
V
PSRR
V
Supply Rejection Ratio
V
= 50mV, V = 36V, V = 3V to 30V
105
100
120
120
dB
dB
CC
CC
SENSE
S
CC
Supply Voltage V
Bandwidth
2.7
36
V
CC
CC
BW
A = 10V/V, f = –3dB
100
20
150
50
kHz
kHz
V
O
A = 50V/V, f = –3dB
V
O
t
I
I
Output Settling to 1% Final Value
Sense Input Current
V
V
V
V
= 10mV to 100mV
15
4.5
60
µs
µA
µA
V/µs
V/µs
S
SENSE
SENSE
SENSE
+
–
, I
= 0V
●
●
10
S (O) S (O)
CC(O)
V
Supply Current
= 0V, V = 5V
130
CC
CC
SR
Slew Rate
= 15V, V
= 50mV to 300mV, A = 50V/V
0.03
0.02
0.05
0.05
CC
SENSE
V
●
+
–
I
Short-Circuit Current
I
, I
SC SC
8
15
60
mA
V
SC
Reverse V Supply
I = –100µA
●
●
50
S
S
V
V
Minimum Output Voltage
V
V
= 0V, No Load
15
15
30
25
mV
mV
O(MIN)
O(MAX)
SENSE
SENSE
+
–
= V – V = –100mV, A = 50V/V, No Load
S
S
V
Output High
V
V
V
V
= 5V, A = 50V/V, V
= 100mV, I = 0
●
●
●
●
75
85
125
175
125
150
250
400
mV
mV
mV
mV
CC
V
SENSE
L
= 100mV, I = 100µA
SENSE
SENSE
SENSE
L
= 100mV, I = 500µA
L
= 100mV, I = 1mA
L
+
–
I
, I (Off) Sense Input Current (Power Down)
V
= 0V, V = 48V, V = 0V
SENSE
●
0.001
1
µA
S
S
CC
S
The ● denotes specifications which apply over the temperature range –40°C ≤ TA ≤ 85°C (LT6100I), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
Single Supply Operation (V = 2.7V)
MIN
TYP
MAX
UNITS
–
+
V
V
, V
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
●
4.1
48
V
S
S
CC
+
–
V
V
= V – V , V = 3V, A = 10V/V
●
●
110
300
mV
mV
SENSE
SENSE
SENSE
S
S
CC
V
+
–
= V – V , V = 5V, A = 10V/V
S
S
CC
V
V
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
I
= 0, V = 5V
–300
–550
±80
±80
0.5
300
550
µV
µV
µV
µV
OS
OUT
CC
●
I
= 0, V = 5V
–350
–600
350
600
OUT
CC
●
●
V
A
TC
Temperature Coefficient of V
V
V
= 5V (Note 6)
3
µV/°C
OS
V
OS
CC
Gain, V /V
= 50mV to 80mV, V = 5V, A = 10V/V
9.95
9.94
9.90
10
10
10
10.05
10.06
10.10
V/V
V/V
V/V
OUT SENSE
SENSE
CC
V
LT6100DD8
●
●
V = 48V
9.9
10
10.10
0.5
V/V
%
S
Output Voltage Gain Error (Note 7)
V
= 50mV to 80mV, V = 5V,
–0.5
SENSE
CC
A = 10, 12.5, 20, 25, 40, 50V/V
V
LT6100DD8
–0.6
–1.0
0.6
1.0
%
%
●
●
V = 48V
S
–1.0
1.0
%
6100f
3
LT6100
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the temperature range –40°C ≤ TA ≤ 85°C (LT6100I), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
V CMRR
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V Sense Input Common Mode
V
= 50mV, V = 2.7V, V = 4.1V to 36V
105
100
120
120
dB
dB
S
S
SENSE
CC
S
Rejection Ratio
●
●
V
V
PSRR
V
Supply Rejection Ratio
V
= 50mV, V = 36V, V = 3V to 30V
105
100
120
120
dB
dB
CC
CC
SENSE
S
CC
Supply Voltage V
Bandwidth
2.7
36
V
CC
CC
BW
A = 10V/V, f = –3dB
100
20
150
50
kHz
kHz
V
O
A = 50V/V, f = –3dB
V
O
t
I
I
Output Settling to 1% Final Value
Sense Input Current
Supply Current
V
V
V
V
= 10mV to 100mV
15
4.5
60
µs
µA
µA
V/µs
V/µs
S
SENSE
SENSE
SENSE
+
–
, I
= 0V
●
●
10
S (O) S (O)
CC(O)
+
= 0V, V Supply = 5V
145
SR
Slew Rate
= 15V, V
= 50mV to 300mV, A = 50V/V
0.03
0.02
0.05
0.05
CC
SENSE
V
●
+
–
I
Short-Circuit Current
I
, I
SC SC
8
15
60
mA
V
SC
Reverse V Supply
I = –100µA
●
●
50
S
S
V
V
Minimum Output Voltage
V
V
= 0V, No Load
15
15
30
25
mV
mV
O(MIN)
O(MAX)
SENSE
SENSE
+
–
= V – V = –100mV, A = 50V/V, No Load
S
S
V
Output High
V
V
V
V
= 5V, A = 50V/V, V
= 100mV, I = 0
●
●
●
●
75
85
125
175
125
150
250
400
mV
mV
mV
mV
CC
V
SENSE
L
= 100mV, I = 100µA
SENSE
SENSE
SENSE
L
= 100mV, I = 500µA
L
= 100mV, I = 1mA
L
+
–
I
, I (Off) Sense Input Current (Power Down)
V
= 0V, V = 48V, V = 0V
SENSE
●
0.001
1
µA
S
S
CC
S
The ● denotes specifications which apply over the temperature range –40°C ≤ TA ≤ 125°C (LT6100H), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
Single Supply Operation (V = 2.7V)
MIN
TYP
MAX
UNITS
–
+
V
V
, V
Sense Amplifier Supply Voltage
Input Sense Voltage Full Scale
●
4.1
48
V
S
S
CC
+
–
V
V
= V – V , V = 3V, A = 10V/V
●
●
110
300
mV
mV
SENSE
SENSE
SENSE
S
S
CC
V
+
–
= V – V , V = 5V, A = 10V/V
S
S
CC
V
V
Input Offset Voltage (MS Package)
Input Offset Voltage (DD Package)
I
= 0, V = 5V
–300
–600
±80
±80
0.5
300
600
µV
µV
µV
µV
OS
OUT
CC
●
I
= 0, V = 5V
–350
–650
350
650
OUT
CC
●
●
V
A
TC
Temperature Coefficient of V
V
V
= 5V (Note 6)
5
µV/°C
OS
V
OS
CC
Gain, V /V
= 50mV to 80mV, V = 5V, A = 10V/V
9.95
9.94
9.90
10
10
10
10.05
10.06
10.10
V/V
V/V
V/V
OUT SENSE
SENSE
CC
V
LT6100DD8
●
●
V = 48V
9.9
10
10.10
0.5
V/V
%
S
Output Voltage Gain Error (Note 7)
V
= 50mV to 80mV, V = 5V,
–0.5
SENSE
CC
A = 10, 12.5, 20, 25, 40, 50V/V
V
LT6100DD8
–0.6
–1.0
0.6
1.0
%
%
●
●
V = 48V
S
–1.0
1.0
%
6100f
4
LT6100
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the temperature range –40°C ≤ TA ≤ 125°C (LT6100H), otherwise specifications are
TA = 25°C. VCC = 5V, VEE = 0V, VS+ = VCC + 1.4V unless otherwise specified. (Note 5)
SYMBOL
V CMRR
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V Sense Input Common Mode
V
= 50mV, V = 2.7V, V = 4.1V to 36V
105
100
120
120
dB
dB
S
S
SENSE
CC
S
Rejection Ratio
●
●
V
V
PSRR
V
Supply Rejection Ratio
V
= 50mV, V = 36V, V = 3V to 30V
105
95
120
120
dB
dB
CC
CC
SENSE
S
CC
Supply Voltage V
Bandwidth
2.7
36
V
CC
CC
BW
A = 10V/V, f = –3dB
100
20
150
50
kHz
kHz
V
O
A = 50V/V, f = –3dB
V
O
t
I
I
Output Settling to 1% Final Value
Sense Input Current
Supply Current
V
V
V
V
= 10mV to 100mV
15
4.5
60
µs
µA
µA
V/µs
V/µs
S
SENSE
SENSE
SENSE
+
–
, I
= 0V
●
●
10
S (O) S (O)
CC(O)
= 0V, V = 5V
170
CC
SR
Slew Rate
= 15V, V
= 50mV to 300mV, A = 50V/V
0.03
0.02
0.05
0.05
CC
SENSE
V
●
+
–
I
Short-Circuit Current
I
, I
SC SC
8
15
60
mA
V
SC
Reverse V Supply
I = –100µA
●
●
50
S
S
V
V
Minimum Output Voltage
V
V
= 0V, No Load
15
15
35
25
mV
mV
O(MIN)
O(MAX)
SENSE
SENSE
+
–
= V – V = –100mV, A = 50V/V, No Load
S
S
V
Output High
V
V
V
V
= 5V, A = 50V/V, V
= 100mV, I = 0
●
●
●
●
75
85
125
175
140
160
250
400
mV
mV
mV
mV
CC
V
SENSE
L
= 100mV, I = 100µA
SENSE
SENSE
SENSE
L
= 100mV, I = 500µA
L
= 100mV, I = 1mA
L
+
–
I
, I (Off) Sense Input Current (Power Down)
V
= 0V, V = 48V, V = 0V
SENSE
●
0.001
1
µA
S
S
CC
S
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 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 3: A heat sink may be required to keep the junction temperature
below absolute maximum ratings.
Note 7: Gain error for A = 12.5, 25V/V is guaranteed by other gain
error test.
V
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.
6100f
5
LT6100
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Input Offset Voltage
vs Temperature
Input Offset Voltage
vs VS+ Input Voltage
Input Offset Voltage
vs VCC Supply Voltage
1.5
1.0
400
300
350
300
V
V
= 100mV
SENSE
= 3V
9 TYPICAL UNITS
T
= 85°C
= 25°C
A
CC
V
V
= 6.4V
= 5V
S
CC
T
= –40°C
= 125°C
A
A
T
= 25°C
0.5
A
A
200
T
A
250
0
100
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
T
T
= 85°C
T
= –40°C
200
150
100
50
A
0
V
V
= 100mV
SENSE
S
+
= 48V
–100
–200
–300
– 400
T
= 125°C
A
0
10 15 20 25
SUPPLY VOLTAGE (V)
40
0
40
0
5
30 35
10
20
30
50
–40 –25 –10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6100 G21
+
V
S
INPUT VOLTAGE (V)
V
CC
6100 G01
6100 G02
Output Voltage vs Sense Voltage
Output Voltage vs Sense Voltage
Gain vs Temperature
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50.06
50.04
50.02
50.00
49.98
49.96
49.94
49.92
49.90
49.88
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
+
+
V
V
A
= 4.4V TO 48V
= 3V
7 TYPICAL UNITS
V
V
T
= 6.4V TO 48V
= 5V
S
S
T
= –40°C
V
= 50mV TO 80mV
A
V
CC
= 10V/V
= –40°C TO 125°C
SENSE
CC
+
> 6.6V
S
V
V
A
= 6.4V TO 48V
= 5V
= –40°C TO 125°C
V
A
S
CC
V
A
T
T
= –40°C
S
A
V
= 50V/V
> 4.6V
T
A
V
= –40°C
S
T
= –40°C
A
V
= 6.4V
= 4.4V
S
0
180
240
–
300
–150
–90
–30
150
60
120
–40 –25 –10
5
20 35
125
30
+
90
50 65 80 95 110
+
–
SENSE VOLTAGE (V – V ) (mV)
SENSE VOLTAGE (V – V )(mV)
TEMPERATURE (°C)
S
S
S
S
6100 G04
6100 G03
6100 G05
Positive Sense Input Current
vs Sense Voltage
Negative Sense Input Current
vs Sense Voltage
Output Positive Swing
vs Load Current
35
30
25
20
15
10
5
12
10
8
350
300
+
+
+
V
V
= 4.4V TO 48V
= 3V
V
V
= 4.4V TO 48V
= 3V
V
V
V
A
= 6.4V
= 5V
S
S
S
CC
CC
CC
= 150mV
SENSE
= 50V/V
T
A
= 125°C
T
= 125°C
A
V
250
T
A
= 85°C
T
A
= 85°C
T
A
= 25°C
200
150
100
50
T
= 125°C
A
6
T
A
= –40°C
T
= 85°C
= 25°C
= –40°C
A
A
T
= 25°C
A
4
T
T
= –40°C
T
A
A
2
0
–5
0
0
–30
–110 –70
30
+
70
110
30
70
0
0.3
0.4 0.5 0.6 0.7 0.8 0.9
1.0
–110 –70 –30
110
0.1 0.2
–
+
–
SENSE VOLTAGE (V – V ) (mV)
LOAD CURRENT (mA)
SENSE VOLTAGE (V – V ) (mV)
S
S
S
S
6100 G07
6100 G08
6100 G06
6100f
6
LT6100
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current vs
VS Input Voltage
Op Amp Output Impedance
vs Frequency
Gain vs Frequency
200
180
160
140
120
100
80
10k
1k
50
40
30
20
+
–
V
V
= 0V
SENSE
CC
V
V
= 12.1V
= 10V
V
V
V
, V = 6.5V
S
S
CC
S
= 3V
= 5V
= –5V
A
A
= 50
= 10
CC
EE
FIL = 0V
V
V
T
= 125°C
A
T
= 85°C
A
100
10
10
0
T
= 25°C
A
G2 = 5V/V
G2 = 2V/V
T
= –40°C
A
–10
–20
–30
–40
–50
60
G2 = 1V/V
100k
40
1
20
0
0.1
0
10
20
30
40
50
1k
10k
1M
100
1k
10k
100k
1M
10M
TOTAL V INPUT VOLTAGE (V)
S
FREQUENCY (Hz)
FREQUENCY (Hz)
6100 G09
6100 G10
6100 G23
CMRR vs Frequency
VCC PSRR vs Frequency
Gain Error vs VSENSE
150
130
110
90
1
0
V
S
= 10V
= 100mV
V
V
= 6.4V
= 5V
S
CC
140
120
100
80
V
SENSE
V
= 5V
CC
70
–1
–2
60
50
40
+
30
V
= 6.4V
= 5V
S
V
CC
= 10V/V
= 25°C
20
10
A
V
A
T
–10
–3
0
0
50
100
V
150 200
(mV)
SENSE
250
300
0.1
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
6100 G12
6100 G11
6100 G24
Sense Input +Current (VCC Powered
Down) vs VS
Step Response at VSENSE = 0V to
130mV
Step Response at VSENSE = 0V to
130mV
10
1
+
–
V
S
= V
S
130mV
130mV
SENSE
0V
T
= 125°C
A
V
V
SENSE
0V
6.5V
T
= 85°C
A
1.3V
0.1
0.01
V
OUT
V
OUT
0V
T
T
= 25°C
0V
A
6100 G13
6100 G14
V
S
A
V
C
L
= 10V
= 10V/V
= 0pF
50µs/DIV
V
S
A
V
C
L
= 10V
= 50V/V
= 0pF
0.2ms/DIV
= –40°C
40
A
0.001
0
10
20
V
30
50
+
(V)
S
6100 G25
6100f
7
LT6100
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Step Response at VSENSE = 0V to
10mV
Step Response at VSENSE = 0V to
10mV
Step Response at VSENSE = 0V to
130mV
130mV
20mV
20mV
V
V
SENSE
V
SENSE
SENSE
0V
0V
0V
500mV
1.3V
100mV
V
V
OUT
OUT
V
OUT
0V
0V
0V
6100 G15
6100 G16
6100 G17
V
A
C
= 10V
50µs/DIV
V
A
C
= 10V
= 50V/V
= 0pF
50µs/DIV
V
A
C
= 10V
50µs/DIV
S
V
S
V
L
S
V
= 10V/V
= 0pF
= 10V/V
= 1000pF
OUT
OUT
Step Response at VSENSE = 0V to
130mV
Step Response at VSENSE = 0V to
10mV
130mV
20mV
V
SENSE
V
SENSE
0V
0V
6.5V
100mV
V
OUT
V
OUT
0V
0V
6100 G18
6100 G19
V
S
A
V
C
L
= 10V
= 50V/V
= 1000pF
0.2ms/DIV
V
A
C
= 10V
= 10V/V
= 1000pF
50µs/DIV
S
V
L
Step Response at VSENSE = 0V to
10mV
Start-Up Delay
20mV
V
SENSE
10V
0V
+
0V
V
S
500mV
1V
0V
V
OUT
V
OUT
0V
6100 G22
6100 G20
V
V
A
V
= 5V
20µs/DIV
CC
SENSE
V
V
S
A
V
C
L
= 10V
= 50V/V
= 1000pF
50µs/DIV
= 100mV
= 10V/V
= 0V
EE
6100f
8
LT6100
U
U
U
PI FU CTIO S
–
VS (Pin 1): Negative Sense Input Terminal. Negative
sense voltage input will remain functional for voltages up
to 48V. VS– is connected to an internal gain-setting resis-
tor RG2 = 5k.
A2 (Pin 6): Gain Select Pin. Refer to Table 1.
A4 (Pin 7): Gain Select Pin. When Pin 7 is shorted to VEE,
the total gain is 40V/V. When both Pin 6 and Pin 7 are
shortedtoVEE,thetotalgainis50V/V.WhenbothPin6and
Pin 7 are opened, the total gain is 10V/V.
V
CC (Pin 2): Supply Voltage Input. This power supply pin
supplies current to both current sense amplifier and op
amp.
VS+ (Pin 8): Positive Sense Input Terminal. Connecting a
supply to VS+ and a load to VS– will allow the LT6100 to
+
FIL (Pin 3): Filter Pin. Connects to an external capacitor to
monitor the current through RSENSE, refer to Figure 1. VS
roll off differential noise of the system. Pole frequency
is connected to an internal gain setting resistor RG1 = 5k.
VS+ remains functional for voltages up to 48V.
f
–3dB = 1/(2πRFILC), RFIL = RE + RO = 60k.
VEE (Pin 4): Negative Supply or Ground for Single Supply
Operation.
VOUT (Pin 5): Voltage Output Proportional to the Magni-
tude of the Current Flowing Through RSENSE
:
VOUT = AV • (VSENSE ± VOS)
VOS is the input offset voltage. AV is the total gain of the
LT6100.
U
U
W
FU CTIO AL DIAGRA
R
SENSE
V
IN
LOAD
(V + 1.4V) TO 48V
CC
1
8
–
+
V
V
S
S
R
R
G2
5k
G1
5k
+
–
R
25k
A1
V
CC
2
–
+
2.7V TO 36V
V
OUT
R
E
Q1
A2
5
10k
V
O1
R
O
R
R/3
A4
50k
V
EE
FIL
A2
4
3
6
7
6100 F01
Figure 1. Functional Diagram
6100f
9
LT6100
W U U
U
APPLICATIO S I FOR ATIO
Table 1. Gain Set with Pin 6 and Pin 7
The LT6100 high side current sense amplifier (Figure 1)
provides accurate unidirectional monitoring of current
through a user-selected sense resistor. The LT6100 fea-
tures a fully specified 4.1V to 48V input common mode
range. A high PSRR VCC supply (2.7V to 36V) powers the
current sense amplifier and the internal op amp circuitry.
The input sense voltage is level shifted from the positive
sense power supply to the ground reference and amplified
by a user-selected gain to the output. The buffered output
voltage is directly proportional to the current flowing
through the sense resistor.
A2 (PIN 6)
A4 (PIN 7)
Open
G2
1
A
V
Open
10
12.5
20
V
V
Out
1.25
2
EE
EE
Open
Out
V
EE
V
EE
V
EE
2.5
4
25
Open
40
V
5
50
EE
Selection of External Current Sense Resistor
External RSENSE resistor selection is a delicate trade-off
between power dissipation in the resistor and current
measurementaccuracy.Themaximumsensevoltagemay
be as large as ± 300mV to get maximum dynamic range.
For high current applications, the user may want to mini-
mize the sense voltage to minimize the power dissipation
in the sense resistor. The LT6100’s low input offset
voltage of 80µV allows for high resolution of low sense
voltages. This allows limiting the maximum sense voltage
while still providing high resolution current monitoring.
Kelvin connection of the LT6100’s VS+ and VS– inputs to
the sense resistor should be used to provide the highest
accuracy in high current applications. Solder connections
and PC board interconnect resistance (approximately
0.5mΩ per square) can be a large error in high current
systems. A 5A application might choose a 20mΩ sense
resistor to give a 100mV full-scale input to the LT6100.
Input offset voltage will limit resolution to 4mA. Neglect-
ing contact resistance at solder joints, even one square of
PC board copper at each resistor end will cause an error of
5%. This error will grow proportionately higher as moni-
tored current levels rise.
Theory of Operation (Refer to Figure 1)
+
CurrentfromthesourceatVS flowsthroughRSENSE tothe
–
+
load at VS , creating a sense voltage, VSENSE. Inputs VS
and VS– apply the sense voltage to RG2. The opposite ends
of resistors RG1 and RG2 are forced to be at equal poten-
tials by the voltage gain of amplifier A1. The current
through RG2 is forced to flow through transistor Q1 and is
sourced to node VO1. The current from RG2 flowing
throughresistorRO givesavoltagegainoften,VO1/VSENSE
= RO/RG2 = 10V/V. The sense amplifier output at VO1 is
amplified again by amplifier A2. The inputs of amplifier A2
can operate to ground which ensures that small sense
voltage signals are detected. Amplifier A2 can be pro-
grammed to different gains via Pin 6 and Pin 7. Thus, the
total gain of the system becomes AV = 10 • A2 and VOUT
VSENSE • AV.
=
Gain Setting
The LT6100 gain is set by strapping (or floating) the two
gain pins (see Table 1). This feature allows the user to
“zoom in” by increasing the gain for accurate measure-
ment of low currents.
AV = 10V/V • G2, G2 is the gain of op amp A2.
6100f
10
LT6100
W U U
APPLICATIO S I FOR ATIO
U
these constraints, an amplified, level shifted representa-
tionoftheRSENSE voltageisdevelopedatVOUT. Theoutput
is well behaved driving capacitive loads to 1000pF.
Noise Filtering
The LT6100 provides signal filtering via pin FIL that is
internally connected to the resistors RE and RO. This pin
maybeusedtofiltertheinputsignalenteringtheLT6100’s
internal op amp, and should be used when fast ripple
current or transients flow through the sense resistor. High
frequency signals above the 300kHz bandwidth of the
LT6100’s internal amplifier will cause errors. A capacitor
connected between FIL and VEE creates a single pole low
pass filter with corner frequency:
Sense Input Signal Range
The LT6100 has high CMRR over the wide input voltage
range of 4.1V to 48V. The minimum operation voltage of
the sense amplifier input is 1.4V above VCC. The output
remainsaccurateevenwhenthesenseinputsaredrivento
48V. Figure 2 shows that VOS changes very slightly over
a wide input range. Furthermore, the sense inputs VS+ and
f
–3dB = 1/(2πRFILC)
–
VS can collapse to zero volts without incurring any
damage to the device. The LT6100 can handle differential
sense voltages up to the voltage of the sense inputs
supplies. For example, VS+ = 48V and VS– = 0V can be a
valid condition in a current monitoring application (Figure
where RFIL = 60k. A 220pF capacitor creates a pole at
12kHz, a good choice for many applications.
Output Signal Range
–
3) when an overload protection fuse is blown and VS
TheLT6100’soutputsignalisdevelopedbycurrentthrough
RG2 into output resistor RO. The current is VSENSE/RG2.
The sense amplifier output, VO1, is buffered by the internal
op amp so that connecting the output pins to other
voltage collapses to ground. Under this condition, the
output of the LT6100 goes to the positive rail, VOH. There
is no phase inversion to cause an erroneous output signal.
For the opposite case when VS+ collapse to ground with
VS– held up at some higher voltage potential, the output
will sit at VOL. If both inputs fall below the minimum CM
voltage, VCC + 1.4V, the output is indeterminate but the
LT6100 will not be damaged.
systems will preserve signal accuracy. For zero VSENSE
,
internal circuit saturation with loss of accuracy occurs at
the minimum VOUT swing, 15mV above VEE. VOUT may
swing positive to within 0.75V of VCC or a maximum of
36V, a limit set by internal junction breakdown. Within
1.5
TO LOAD
R
FUSE
SENSE
V
V
T
= 100mV
SENSE
CC
A
DC
1.0
0.5
= 3V
SOURCE
= 25°C
C1
0.1µF
1
8
–
+
0
V
S
V
S
2
7
6
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
V
A4
A2
CC
+
C2
–
+
5V
0.1µF
3
FIL
OUT
4
5
OUTPUT
V
EE
LT6100
0
40
10
20
30
50
6100 F03
V
INPUT VOLTAGE (V)
S
6100 F02
Figure 2. VOS vs VS Input Voltage
Figure 3. Current Monitoring of a Fuse Protected Circuit
6100f
11
LT6100
W U U
U
APPLICATIO S I FOR ATIO
as VOL = 15mV. The accuracy at small sense voltages can
be improved by selecting higher gain. When gain of 50V/
V is selected, as shown in Figure 7, VOUT leaves the clipped
regionforapositiveVSENSE greaterthan1mVcomparedto
2.5mV for gain of 10V/V (see Figure 6).
Low Sense Voltage Operation
Figure 4 shows the simplest circuit configuration in
which the LT6100 may be used. While VOUT (output
voltage) increases with positive sense current, at VSENSE
=0V,theLT6100’sbufferedoutputcanonlyswingaslow
1.6
V
V
A
= 4.4V TO 48V
S
TO LOAD
R
SENSE
= 3V
CC
= 10V/V
= 25°C
1.4
1.2
1.0
V
A
+
T
C1
0.1µF
5V
1
8
–
+
V
V
S
S
2
7
6
V
A4
A2
0.8
0.6
CC
+
C2
–
+
3V
0.1µF
3
0.4
0.2
0
FIL
OUT
4
5
OUTPUT
V
EE
30
60
120
0
150
90
+
LT6100
–
SENSE VOLTAGE (V – V ) (mV)
S
S
6100 F04
6100 F05
Figure 5. Output Voltage vs VSENSE
Figure 4. LT6100 Load Current Monitor
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.40
0.35
0.30
0.25
V
V
A
T
= 4.4V TO 48V
= 3V
V
V
A
T
= 4.4V TO 48V
= 3V
S
CC
V
A
S
CC
V
A
= 10V/V
= 50V/V
= 25°C
= 25°C
0.20
0.15
0.10
0.05
0
0
5
10
20
0
25
30
15
0
5
10
15
30
20
25
+
–
+
–
SENSE VOLTAGE (V – V ) (mV)
SENSE VOLTAGE (V – V ) (mV)
S
S
S
S
6100 F06
6100 F07
Figure 6. Expanded View of Output Voltage vs VSENSE, AV = 10V/V
Figure 7. Expanded View of Output Voltage vs VSENSE
,
AV = 50V/V
6100f
12
LT6100
W U U
APPLICATIO S I FOR ATIO
U
Power Down While Connected to a Battery
This is due to the implementation of Linear Technology’s
Over-The-Top® input topology at its front end. When
powered down, the LT6100 inputs draw less than 1µA of
current.
Another unique benefit of the LT6100 is that you can leave
it connected to a battery even when it is denied power.
When the LT6100 loses power or is intentionally powered
down, its inputs remain high impedance (see Figure 8).
Over-The-Top is a registered trademark of Linear Technology Corporation.
I
SENSE
R
SENSE
–
TO LOAD
+
BATTERY
4.1V TO 48V
+
V
V
LT6100
S
S
POWER
–
+
DOWN OK
V
CC
3V
0V
V
CC
INPUTS
REMAIN
Hi-Z
FIL
V
OUT
V
A2
A4
EE
6100 F08
Figure 8. Input Remains Hi-Z when LT6100 is Powered Down
U
TYPICAL APPLICATIO
Adjust Gain Dynamically for Enhanced Range
Micro-Hotplate Voltage and Current Monitor
+
V
DR
I
SENSE
R
SENSE
–
TO LOAD
FROM SOURCE
+
10Ω
1%
V
V
LT6100
S
S
–
+
V
V
V
S
S
I
–
HOTPLATE
+
–
+
5V
V
5V
CURRENT
MONITOR
OUT
CC
CC
LT6100
EE A2 A4
V
= 500mV/mA
FIL
V
MICRO-HOTPLATE
BOSTON
MICROSYSTEMS
MHP100S-005
V
OUT
V
A2
A4
EE
6100 TA05
5V
5V
5V
2N7002
M9
M3
M1
(GAIN = 50)
0V
VOLTAGE
MONITOR
(GAIN = 10)
LT1991
+
–
P1
P3
P9
V
– V
10
DR
DR
V
OUT
=
–
6100 TA06
V
DR
www.bostonmicrosystems.com
6100f
13
LT6100
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 ±0.05
3.5 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
0.38 ± 0.10
TYP
5
8
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 1203
4
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
6100f
14
LT6100
U
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.52
(.0205)
REF
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ± .0015)
TYP
8
7 6
5
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
1
2
3
4
0.53 ± 0.152
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.127 ± 0.076
(.009 – .015)
(.005 ± .003)
0.65
(.0256)
BSC
TYP
MSOP (MS8) 0204
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6100f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT6100
U
TYPICAL APPLICATIO
800mA/1A White LED Current Regulator
D2
LED
WARNING! VERY BRIGHT
DO NOT OBSERVE DIRECTLY
L1
3µH
LED
CURRENT
D1
B130
0.030Ω
LT6100
+
–
V
V
S
S
V
IN
V
V
SW
3.3V TO 4.2V
SINGLE Li-Ion
IN
V
CC
LT3436
–
+
22µF
16V
CER
1210
SHDN
GND
FB
C
LED
ON
124k
V
V
OUT
V
EE A4 A2
MMBT2222
4.99k
4.7µF
6.3V
CER
8.2k
0.1µF
OPEN: 1A
CLOSED: 800mA
6100 TA02
D1: DIODES INC.
D2: LUMILEDS LXML-PW09 WHITE EMITTER
L1: SUMIDA CDRH6D28-3R0
Filtered Gain of 20 Current Sense
Gain of 50 Current Sense
I
I
SENSE
SENSE
R
R
SENSE
SENSE
V
V
SUPPLY
6.4V TO 48V
SUPPLY
4.4V TO 48V
+
–
+
–
V
V
LOAD
V
V
S
LOAD
LT6100
LT6100
S
S
S
–
–
+
+
V
V
3V
5V
CC
CC
FIL
FIL
V
V
OUT
1000pF
OUT
20 • R
• I
50 • R
• I
SENSE SENSE
SENSE SENSE
V
A2
A4
V
A2
A4
EE
EE
6100 TA03
6100 TA04
–3dB AT 2.6kHz
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
120dB CMRR, 3V to 18V Operation
LTC1043
Dual Precision Instrumentation Switched Capacitor Building Block
Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps
LT1490/LT1491
50µA Amplifier, 2.7V to 40V Operation,
Over-The-TopTM Inputs
LT1620/LT1621
Rail-to-Rail Current Sense Amplifiers
Accurate Output Current Programming, Battery Charging
to 32V
LT1787
Precision Bidirectional, High Side Current Sense Amplifier
High Voltage, High Side, Precision Current Sense Amplifier
75µV V , 60V, 60µA Operation
OS
LTC6101
4V to 60V, Gain Configurable, SOT-23
Over-The-Top is a trademark of Linear Technology Corporation.
6100f
LT/TP 0405 500 • PRINTED IN THE USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
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