FEATURES
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LTC6104
High Voltage, High Side,
Bi-Directional Current
Sense Amplifier
DESCRIPTION
The LTC
®
6104 is a versatile, high voltage, high side, bi-
directional current sense amplifier. Design flexibility is
provided by the excellent device characteristics: ±450µV
maximum offset and only 520µA of current consumption
(typical at 12V). The LTC6104 operates on supplies from
4V to 60V.
The LTC6104 monitors bi-directional current via the voltage
across an external sense resistor (shunt resistor). This
sense voltage is then translated into a ground referenced
signal. Gain is set with three external resistors and can
be separately configured for both directions. Low DC
offset allows 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 LTC6104 ideal for a wide variety of automotive, industrial
and power management applications. A maximum input
sense voltage of 500mV allows a wide range of currents
to be monitored. The fast response makes the LTC6104
the perfect choice for load current warnings and shutoff
protection control. With very low supply current, the
LTC6104 is suitable for power sensitive applications.
The LTC6104 is available in an 8-lead MSOP package.
Wide Supply Range: 4V to 60V with 70V Absolute
Maximum
Low Offset Voltage: ±450µV Maximum
Fast Response: 1µs Response Time
Gain Configurable with External Resistors; Each
Direction is Gain Configurable
Low Input Bias Current: 170nA Maximum
PSRR: 110dB Minimum
Output Current: ±1mA Maximum
Low Supply Current: 520µA, 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
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
16-Bit Resolution Bi-Directional Output into LTC1286 ADC
I
LOAD
TO
CHARGER/LOAD
–
V
SENSE
+
+
12V
R
SENSE
R
IN
R
IN
100Ω 100Ω
Step Response
V
SENSE–
∆V
SENSE
= 100mV
8
+INA
7
–INA
6
–INB
5
+INB
6V
+ –
A
V
S
– +
B
V
S
V
REF
CURRENT
MIRROR
V
REF
+IN
V
CC
CS
LTC1286
C2
0.1µF
–IN
LT
®
1004-2.5
GND
6104 TA01a
R1
2.3k
C1
1µF
+
5V
V
OUT
1.5V
1V
TO
µP
I
OUT
= 100µA
I
OUT
= 0µA
TIME (1µs/DIV)
6104 G15
LTC6104
OUT
1
V
–
4
CLK
D
OUT
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 1V
R
OUT
2.5k
6104f
1
LTC6104
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (+INB(V
S
) to V
–
) ......................70V
Maximum Applied Output Voltage (OUT) ....................9V
Input Current........................................................±10mA
Output Short-Circuit Duration (to V
–
)............... Indefinite
Operating Temperature Range
LTC6104C ............................................ –40°C to 85°C
LTC6104I ............................................. –40°C to 85°C
LTC6104H .......................................... –40°C to 125°C
Specified Temperature Range (Note 2)
LTC6104C ................................................ 0°C to 70°C
LTC6104I ............................................. –40°C to 85°C
LTC6104H .......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT
NC
NC
V
–
1
2
3
4
8
7
6
5
+INA
–INA
–INB
+INB/V
S
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
ORDER PART NUMBER
LTC6104CMS8
LTC6104IMS8
LTC6104HMS8
MS8 PART MARKING*
LTCMP
LTCMP
LTCMP
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
V
S
V
OS
ΔV
OS
/ΔT
I
B
V
SENSE(MAX)
(Note 3)
PSRR
PARAMETER
Supply Range
Output Offset Voltage
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 ≤ +INB(V
S
) ≤ 60V, V
–
= 0V, V
REF
= 2V for
V
S
≥ 6V, V
REF
= 0.75V for V
S
= 4V, unless otherwise noted.
CONDITIONS
●
MIN
4
TYP
±85
MAX
60
±450
±600
±700
170
245
UNITS
V
µV
µV
µV
µV/°C
nA
nA
mV
mV
V
SENSE
= ±5mV, LTC6104
V
SENSE
= ±5mV, LTC6104C, LTC6104I
V
SENSE
= ±5mV, LTC6104H
V
SENSE
= ±5mV
R
IN
= 1M for –INA and –INB
6V ≤ V
S
≤ 60V, R
IN
= 1k, R
OUT
= 2k, V
REF
= 2V
V
S
= 4V, R
IN
= 1k, R
OUT
= 1k, V
REF
= 0.5V when
V
SENSE
= 500mV, V
REF
= 1V when V
SENSE
= –500mV
●
●
●
●
●
●
Input Offset Voltage Drift
Input Bias Current
Input Sense Voltage Full Scale
±1.5
100
±500
±500
116
112
110
105
110
105
105
100
8
3
1
0.3
0.3
0.25
140
120
133
Power Supply Rejection Ratio
V
S
= 6V to 60V, V
SENSE
= 5mV
V
S
= 6V to 60V, V
SENSE
= –5mV
V
S
= 4V to 60V, V
SENSE
= 5mV
V
S
= 4V to 60V, V
SENSE
= –5mV
●
●
●
●
●
●
●
●
●
●
dB
dB
dB
dB
dB
dB
dB
dB
V
V
V
V
V
V
115
V
OUT(MAX)
Maximum Output Voltage
12V ≤ V
S
≤ 60V, V
SENSE
= 90mV, V
REF
= 4V
V
S
= 6V, V
SENSE
= 75mV, V
REF
= 1.8V, R
OUT
= 2k
V
S
= 4V, V
SENSE
= 35mV, V
REF
= 0.75V, R
OUT
= 1k
12V ≤ V
S
≤ 60V, V
SENSE
= –80mV, V
REF
= 4V
V
S
= 6V, V
SENSE
= –90mV, V
REF
= 1.8V, R
OUT
= 2k
V
S
= 4V, V
SENSE
= –75mV, V
REF
= 0.75V, R
OUT
= 1k
V
OUT(MIN)
Minimum Output Voltage
6104f
2
LTC6104
ELECTRICAL CHARACTERISTICS
SYMBOL
I
OUT(MAX)
I
OUT-GAINERR
I
OUT-OSERR
t
r
PARAMETER
Maximum Output Current
Current Mirror Gain Error
Current Mirror Offset Error
Input Step Response (ΔV
OUT
= to
50% on a 5V Output Step)
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 ≤ +INB(V
S
) ≤ 60V, V
–
= 0V, V
REF
= 2V for
V
S
≥ 6V, V
REF
= 0.75V for V
S
= 4V, unless otherwise noted.
CONDITIONS
6V ≤ V
S
≤ 60V, V
SENSE
= ±110mV, V
REF
= 2V, R
OUT
= 1k
V
S
= 4V, V
SENSE
= ±27.5mV, V
REF
= 0.75V, R
OUT
= 1k
V
INB–
> V
INB+
and V
INA–
< V
INA+
(Note 4)
V
INB–
> V
INB+
and V
INA–
< V
INA+
(Note 4)
8V ≤ V
S
≤ 60V, V
REF
= 1V, V
SENSE
= 0mV to 100mV
Transient
8V ≤ V
S
≤ 60V, V
REF
= 6V, V
SENSE
= –100mV to 0mV
Transient
8V ≤ V
S
≤ 60V, V
REF
= 4V, V
SENSE
= –50mV to 50mV
Transient
Input Step Response (ΔV
OUT
= to
50% on a 0.5V Output Step)
V
S
= 4V, R
OUT
= 500Ω, Gain = 5, V
REF
= 0.5V,
V
SENSE
= 0mV to 100mV Transient
V
S
= 4V, R
OUT
= 500Ω, Gain = 5, V
REF
= 1V,
V
SENSE
= –100mV to 0mV Transient
V
S
= 4V, R
OUT
= 500Ω, Gain = 5, V
REF
= 0.75V,
V
SENSE
= –50mV to 50mV Transient
●
●
MIN
±1
±0.25
TYP
MAX
UNITS
mA
mA
±0.2
±0.2
1
1
3
1.2
1.2
3.2
140
140
200
200
●
●
●
●
●
±0.75
%
µA
µs
µs
µs
µs
µs
µs
kHz
kHz
kHz
kHz
BW
Signal Bandwidth
I
OUT
= 200µA, R
OUT
= 5k
I
OUT
= –200µA, R
OUT
= 5k
I
OUT
= 1mA, R
OUT
= 5k
I
OUT
= –1mA, R
OUT
= 5k
V
S
= 4V, I
OUT
= 0, R
IN
= 1M
V
S
= 6V, I
OUT
= 0, R
IN
= 1M
V
S
= 12V, I
OUT
= 0, R
IN
= 1M
V
S
= 60V, I
OUT
= 0, R
IN
= 1M
LTC6104I, LTC6104C
LTC6104H
I
S
Supply Current
0.45
0.5
0.52
0.64
0.73
0.825
0.79
1
0.81
1
1.04
1.1
1.2
mA
mA
mA
mA
mA
mA
mA
mA
mA
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 LTC6104C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6104C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but are not tested or QA
sampled at these temperatures. LTC6104I is guaranteed to meet specified
performance from –40°C to 85°C. The LTC6104H is guaranteed to meet
specified performance from –40°C to 125°C.
Note 3:
V
SENSE(MAX)
is tested by applying 550mV and verifying the gain
error is less than 1%. The 1% limit is set by the accuracy of high speed
test equipment. Gain error is typically dominated by external resistor
tolerance.
Note 4:
When amplifier A is active and amplifier B is inactive, the gain
error is entirely due to the external resistors R
IN
and R
OUT
. When amplifier
A is inactive and amplifier B is active, there is an additional gain error from
the LTC6104 current mirror circuit. This error term is the gain error term,
I
OUT-GAINERR
plus the offset error term, I
OUT-OSERR
.
6104f
3
LTC6104
TYPICAL PERFORMANCE CHARACTERISTICS
Input V
OS
vs Temperature
100
80
60
INPUT OFFSET (µV)
40
20
0
–20
–40
–60
–80
–100
–40 –20
0
R
IN
= 100Ω
R
OUT
= 5k
V
IN
= 5mV
V
OS
OF INTERNAL
AMPLIFIER A
V
OS
OF INTERNAL
AMPLIFIER B
20 40 60 80
TEMPERATURE (°C)
100 120
6104 G01
Input V
OS
vs Supply Voltage
50
40
30
INPUT OFFSET (µV)
20
10
0
–10
–20
–30
–40
–50
4
11
18
25
32 39
V
S
(V)
46
53
60
T
A
= 25°C
R
IN
= 100Ω
R
OUT
= 5k
V
IN
= 5mV
V
OS
OF INTERNAL
AMPLIFIER A
V
OS
OF INTERNAL
AMPLIFIER B
MAXIMUM V
SENSE
(V)
TWO REPRESENTATIVE UNITS
2.5
Input Sense Range vs Supply
Voltage
T
A
= –40°C
T
A
= 25°C
2.0
T
A
= 0°C
T
A
= 70°C
1.5
T
A
= 85°C
T
A
= 125°C
1.0
TWO REPRESENTATIVE UNITS
0.5
R
IN
= 5k
R
OUT
= 2.5k
T
A
= 25°C
4
10
20
NO LIMITS FOR V
SENSE
IF
V
SENSE
< 0V AND V
S
≥
4V
30
40
V
S
(V)
50
60
6104 G03
0
6104 G02
V
OUT
Maximum vs Temperature
12
V
S
= 60V
10
V
S
= 12V
MAXIMUM OUTPUT (V)
MINIMUM OUTPUT (V)
8
6
4
2
0
–40 –20
0.090
0.085
V
OUT
Minimum vs Temperature
6
4
MAXIMUM I
OUT
(mA)
2
0
I
OUT
Maximum vs Temperature
0.080
V
S
= 60V
0.075
V
S
= 4V, 6V, 12V
0.070
0.065
0.060
0.055
V
S
= 60V V
S
= 12V
–2
–4
–6
–8
V
S
= 6V
V
S
= 4V
V
S
= 6V
V
S
= 4V
0
20 40 60 80
TEMPERATURE (°C)
100 120
6104 G04
0.050
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120
6104 G05
–10
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120
6104 G06
Gain vs Frequency
40
35
30
25
GAIN (dB)
20
15
10
5
0
–5
–10
1k
40
T
A
= 25°C
R
IN
= 100Ω
R
OUT
= 5k
10k
100k
FREQUENCY (Hz)
1M
6104 G08
Input Bias Current vs Temperature
160
I
OUT
=
±1mA
140
V
S
= 6V TO 100V
V
S
= 4V
SUPPLY CURRENT (µA)
120
900
800
700
600
500
400
300
200
100
0
0
20 40 60 80
TEMPERATURE (°C)
100 120
6104 G09
Supply Current vs Supply Voltage
T
A
= 85°C
T
A
= 125°C
T
A
= 70°C
I
OUT
=
±200µA
I
B
(nA)
100
80
60
T
A
= 25°C
T
A
= 0°C
T
A
= –40°C
20
0
–40 –20
V
IN
= 0V
R
OUT
= 1M
4
10
20
30
40
SUPPLY VOLTAGE (V)
50
60
6104 G10
6104f
4
LTC6104
TYPICAL PERFORMANCE CHARACTERISTICS
Step Response 0mV to 10mV
V
S
V
S
–10mV
2.5V
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 2V
V
OUT
2V
V
OUT
TIME (10µs/DIV)
6104 G11
Step Response 0mV to –10mV
V
S
+ 10mV
V
S
2V
V
S
+ 5mV
V
SENSE–
V
S
– 5mV
2.25V
Step Response –5mV to 5mV
V
SENSE–
V
SENSE–
2V
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 2V
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 2V
TIME (10µs/DIV)
6104 G12
6104 G13
1.75V
V
OUT
1.5V
TIME (10µs/DIV)
Step Response –50mV to 50mV
V
S
+ 50mV
V
S
– 50mV V
SENSE
6.5V
6V
C
LOAD
1000pF
4V
C
LOAD
10pF
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 4V
TIME (10µs/DIV)
6104 G14
Step Response Rising Edge
V
SENSE–
∆V
SENSE
= 100mV
Step Response Rising Edge
V
SENSE–
6V
5.5V
∆V
SENSE–
= 100mV
I
OUT
= 0µA
I
OUT
= –100µA
V
OUT
1.5V
1V
I
OUT
= 100µA
I
OUT
= 0µA
TIME (1µs/DIV)
1.5V
V
OUT
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 1V
1V
0.5V
V
OUT
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 6V
TIME (1µs/DIV)
6104 G15
6104 G16
Step Response Rising Edge
V
S
+ 50mV
V
S
– 50mV
7V
V
SENSE–
6.5V
5V
Step Response Falling Edge
V
SENSE–
∆V
SENSE–
= 100mV
V
OUT
4.5V
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 4.5V
TIME (1µs/DIV)
6104 G17
2V
V
OUT
1.5V
1V
T
A
= 25°C
V
S
= 12V
R
IN
= 100Ω
R
OUT
= 5k
V
SENSE+
= V
S
V
REF
= 1V
TIME (1µs/DIV)
I
OUT
= 100µA
I
OUT
= 0µA
6104 G18
6104f
5
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