LTC6103
Dual High Voltage, High Side
Current Sense Amplifier
FEATURES
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DESCRIPTION
The LTC
®
6103 is a versatile, high voltage, high side, dual
current sense amplifier. The two internal amplifiers are
independent except that they share the same V
–
terminal.
Design flexibility is provided by the excellent device char-
acteristics: 450µV maximum offset, and only 275µA of
current consumption (typical at 12V) for each amplifier.
The LTC6103 operates on supplies from 4V to 60V.
The LTC6103 monitors current via the voltage across an
external sense resistor (shunt resistor). Internal circuitry
converts input voltage to output current, allowing for a
small sense signal on a high common mode voltage to be
translated into a ground referenced signal. Low DC offset al-
lows the use of a small shunt resistor and large gain-setting
resistors. As a result, power loss in the shunt is minimal.
The wide operating supply range and high accuracy make
the LTC6103 ideal for an extensive variety of applications
from automotive to industrial and power management.
The fast response makes the LTC6103 the perfect choice
for load current warnings and shutoff protection control.
With very low supply current, the LTC6103 is suitable for
power sensitive applications.
The LTC6103 is available in an 8-lead MSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Two Independent Current Sense Amplifiers
Wide Supply Range: 4V to 60V, 70V Absolute
Maximum
Low Offset Voltage: 450µV Maximum
Fast Response: 1µs Response Time
Gain Configurable with External Resistors
Low Input Bias Current: 170nA Maximum
PSRR: 110dB Minimum (6V to 60V)
Output Current: 1mA Maximum
Low Supply Current: 275µA per Amplifier, V
S
= 12V
Specified for –40°C to 125°C Temperature Range
Available in an 8-lead MSOP Package
APPLICATIONS
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Current Shunt Measurement
Battery Monitoring
Remote Sensing
Power Management
High Voltage Level Translator
TYPICAL APPLICATION
Two 16-Bit Current Sense Channels Connected Directly to the LTC2436-1 ADC
V
A+
I
LOAD
LOAD
8
+INA
7
–INA
–
V
SENSE
+
R
IN
100Ω
V
B+
V
SENSE
Step Response
I
LOAD
LOAD
5
+
–
V
SENSE
–
∆V
SENSE
–
= 100mV
5.5V
5V
R
IN
100Ω
6
–INB
+INB
5V 1µF
+ –
V
SA
– +
V
SB
7
OUTB
2
4
5
CH0
3,8,9,10,14,15,16
6103 TA01a
2
6
CH1
LTC2436-1
1
13
12
11
TO
µP
I
OUT
= 100µA
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
6103 TA01b
LTC6103
OUTA
1
4
V
–
0.5V
0V
V
OUT
I
OUT
= 0µA
500ns/DIV
R
OUT
4.99k
R
OUT
4.99k
6103f
1
LTC6103
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
OUTA
OUTB
NC
V
–
1
2
3
4
8
7
6
5
+INA
–INA
–INB
+INB
Total Supply Voltage (+INA/+INB to V
–
) ....................70V
Maximum Applied Output Voltage (OUTA/OUTB) ........9V
Input Current........................................................±10mA
Output Short-Circuit Duration (to V
–
)............... Indefinite
Operating Temperature Range
LTC6103C ............................................ –40°C to 85°C
LTC6103I ............................................. –40°C to 85°C
LTC6103H .......................................... –40°C to 125°C
Specified Temperature Range (Note 2)
LTC6103C ................................................ 0°C to 70°C
LTC6103I ............................................. –40°C to 85°C
LTC6103H .......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
ORDER PART NUMBER
LTC6103CMS8
LTC6103IMS8
LTC6103HMS8
MS8 PART MARKING*
LTCMN
LTCMN
LTCMN
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 grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
+INA(V
SA
)/
+INB(V
SB
)
V
OS
ΔV
OS
/ΔT
I
B
PSRR
PARAMETER
Supply Voltage Range
Input Offset Voltage
CONDITIONS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. R
IN
= 100Ω, R
OUT
= 5k, 4V ≤ +INA/+INB ≤ 60V, V
–
= 0V unless otherwise
noted.
MIN
●
TYP
MAX
60
UNITS
V
µV
µV
µV
µV/°C
nA
nA
dB
dB
dB
dB
V
V
V
4
±85
V
SENSE
= 5mV, LTC6103
V
SENSE
= 5mV, LTC6103C, LTC6103I
V
SENSE
= 5mV, LTC6103H
V
SENSE
= 5mV
R
IN
= 1M to –INA and –INB
+INA/+INB = 6V to 60V, V
SENSE
= 5mV
+INA/+INB = 4V to 60V, V
SENSE
= 5mV
●
●
●
●
●
●
●
●
●
●
●
●
●
±450
±600
±700
170
245
Input Offset Voltage Drift
Input Bias Current
Power Supply Rejection Ratio
±1.5
100
110
106
105
98
8
3
1
0
22.5
30
35
120
115
V
OUT(MAX)
Maximum Output Voltage
12V ≤ +INA/+INB ≤ 60V, V
SENSE
= 88mV, R
OUT
= 10k
+INA/+INB = 6V, V
SENSE
= 66mV, R
OUT
= 5k
+INA/+INB = 4V, V
SENSE
= 55mV, R
OUT
= 2k
V
SENSE
= 0V, LTC6103
V
SENSE
= 0V, LTC6103C, LTC6103I
V
SENSE
= 0V, LTC6103H
6V ≤ +INA/+INB ≤ 60V, V
SENSE
= 110mV, R
OUT
= 2k
+INA/+INB = 4V, V
SENSE
= 55mV, R
OUT
= 2k, Gain = 20
ΔV
SENSE
= 100mV Step, 6V ≤ +INA/+INB ≤ 60V
+INA/+INB = 4V (1V Output Step), R
OUT
= 1k
I
OUT
= 200µA, R
IN
= 100Ω, R
OUT
= 5k
I
OUT
= 1mA, R
IN
= 100Ω, R
OUT
= 5k
V
OUT(O)
Minimum Output Voltage
(Note 3)
Maximum Output Current
Input Step Response
(to 50% of Output Step)
Signal Bandwidth
mV
mV
mV
mA
mA
I
OUT(MAX)
t
r
BW
1
0.5
1
1.5
120
140
µs
µs
kHz
kHz
6103f
2
LTC6103
ELECTRICAL CHARACTERISTICS
SYMBOL
I
+INA
, I
+INB
PARAMETER
Supply Current per Amplifier
CONDITIONS
+INA/+INB = 4V, I
OUT
= 0, R
IN
= 1M
+INA/+INB = 6V, I
OUT
= 0, R
IN
= 1M
+INA/+INB = 12V, I
OUT
= 0, R
IN
= 1M
+INA/+INB = 60V, I
OUT
= 0, R
IN
= 1M
LTC6103I, LTC6103C
LTC6103H
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:
The LTC6103C is guaranteed to meet specified performance
from 0°C to 70°C. The LTC6103C is designed, characterized and
●
●
●
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. R
IN
= 100Ω, R
OUT
= 5k, 4V ≤ +INA/+INB ≤ 60V, V
–
= 0V unless otherwise
noted.
MIN
TYP
220
255
275
390
MAX
450
475
475
525
500
590
640
690
720
UNITS
µA
µA
µA
µA
µA
µA
µA
µA
µA
expected to meet specified performance from –40°C to 85°C but is not
tested or QA sampled at these temperatures. LTC6103I is guaranteed
to meet specified performance from –40°C to 85°C. The LTC6103H is
guaranteed to meet specified performance from –40°C to 125°C.
Note 3:
This parameter is not tested in production and is guaranteed
by the V
OS
test.
TYPICAL PERFORMANCE CHARACTERISTICS
Input V
OS
vs Temperature
200
150
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
100
50
0
–50
–100
–150
–200
–40 –20
0
R
IN
= 100Ω
R
OUT
= 5k
V
IN
= 5mV
20 40 60 80
TEMPERATURE (°C)
100 120
6103 G01
Input V
OS
vs Supply Voltage
200
150
100
50
0
–50
–100
–150
–200
0
10
20
R
IN
= 100Ω
R
OUT
= 5k
V
IN
= 5mV
40
50
30
V
SUPPLY
AT +INA OR +INB (V)
60
6103 G02
Input Sense Range
5.0
R
IN
= 5k
R
OUT
= 2.5k
4.5
MAXIMUM V
SENSE
(V)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
4
5
6
7
8
V
+
(V)
6103 G03
3 REPRESENTATIVE UNITS
T
A
= 85°C
T
A
= 125°C
T
A
= 45°C
T
A
= 0°C
T
A
= –40°C
9
10
11
12
6103f
3
LTC6103
TYPICAL PERFORMANCE CHARACTERISTICS
V
OUT
Maximum vs Temperature
12
V
S
= 60V
10
MAXIMUM OUTPUT (V)
V
S
= 12V
MAXIMUM I
OUT
(mA)
8
6
V
S
= 6V
4
V
S
= 4V
2
0
–40 –20
7
6
5
4
V
S
= 6V
3
2
1
0
–40 –20
0.01
0
20 40 60 80
TEMPERATURE (°C)
100 120
6103 G05
I
OUT
Maximum vs Temperature
100
V
S
= 12V
10
OUTPUT ERROR (%)
V
S
= 60V
Calculated Output Error Due to
Input Offset vs Input Voltage
T
A
= 25°C
GAIN =10
1
V
S
= 4V
0.1
0
20 40 60 80
TEMPERATURE (°C)
100 120
6103 G04
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
INPUT VOLTAGE (V)
6103 G06
Gain vs Frequency
40
35
30
GAIN (dB)
25
I
OUT
= 200µA
20
15
10
T
A
= 25°C
5 R
IN
= 100Ω
R
OUT
= 5k
0
1k
100k
10k
INPUT FREQUENCY (Hz)
I
OUT
= 1mA
I
B
(nA)
160
140
Input Bias Current vs Temperature
450
400
V
S
= 6V TO 100V
V
S
= 4V
SUPPLY CURRENT (µA)
350
300
250
200
150
100
50
0
20 40 60 80
TEMPERATURE (°C)
100 120
6103 G09
Supply Current vs Supply Voltage
T
A
= 125°C
T
A
= 85°C
T
A
= 70°C
120
100
80
60
40
20
0
–40 –20
T
A
= 25°C
T
A
= –40°C
T
A
= 0°C
V
IN
= 0V
R
IN
= 1M
0
20
30
10
40
50
V
SUPPLY
AT +INA OR +INB (V)
60
1M
6103 G08
0
6103 G10
Step Response 0mV to 10mV
V
V
+
-10mV
0.5V
+
Step Response 10mV to 20mV
V
+
-10mV
V
+
-20mV
V
SENSE
–
V
SENSE
–
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
1V
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
0V
V
OUT
TIME (10µs/DIV)
0.5V
V
OUT
TIME (10µs/DIV)
6103 G11
6103 G12
6103f
4
LTC6103
TYPICAL PERFORMANCE CHARACTERISTICS
Step Response 0mV to 100mV
V
SENSE
–
∆V
SENSE
–
=100mV
5V
C
LOAD
= 10pF
V
+
Step Response 0mV to 100mV
V
SENSE
–
∆V
SENSE
–
=100mV
T
A
= 25°C
V
+
= 12V
C
LOAD
= 2200pF
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
Step Response Rising Edge
V
SENSE
–
∆V
SENSE
–
=100mV
5.5V
5V
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
I
OUT
= 100µA
5V
C
LOAD
= 1000pF
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
0V
V
OUT
TIME (10µs/DIV)
6103 G13
V
OUT
0V
V
OUT
TIME (100µs/DIV)
6103 G14
0.5V
0V
I
OUT
= 0µA
TIME (500ns/DIV)
6103 G15
Step Response Falling Edge
140
V
+
V
OUT
T
A
= 25°C
V
+
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE
+
= V
+
PSRR (dB)
∆V
SENSE
–
=100mV
120
100
PSRR vs Frequency
5.5V
5V
V
S
= 12V
80
V
S
= 4V
60
R
IN
= 100Ω
40 R
OUT
= 5k
C
OUT
= 5pF
GAIN = 50
20
I
OUTDC
= 100µA
V
INAC
= 50mV
P-P
0
0.1
1
10 100 1k 10k
FREQUENCY (Hz)
I
OUT
= 0µA
0.5V
0V
I
OUT
= 100µA
TIME (500ns/DIV)
6103 G16
100k
1M
6103 G17
6103f
5
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