LTC6102-1_15 Datasheet, PDF (1/26 Pages) Linear Technology – Precision Zero Drift Current Sense Amplifier

Features
n _{Supply Range:}
4V to 60V, 70V Maximum (LTC6102)
5V to 100V, 105V Maximum (LTC6102HV)
n _{±10µV Input Offset Maximum}
n _{±50nV/°C Input Offset Drift Maximum}
n _{Fast Response: 1µs Step Response}
n _{Gain Configurable with Two Resistors}
n _{Low Input Bias Current: 3nA Maximum}
n _{PSRR 130dB Minimum}
n _{Output Currents up to 1mA}
n _{Operating Temperature Range: –40°C to 125°C}
n _{Disable Mode (LTC6102-1 Only): 1µA Maximum}
n _{Available in 8-Lead MSOP and 3mm × 3mm}
DFN Packages
Applications
n _{Current Shunt Measurement}
n _{Battery Monitoring}
n _{Remote Sensing}
n _{Load Protection}
n _{Motor Control}
n _{Automotive Controls}
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LTC6102
LTC6102-1/LTC6102HV
Precision Zero Drift
Current Sense Amplifier
Description
The LTC^®6102/LTC6102HV are versatile, high voltage, high-
side current sense amplifiers. Their high supply voltage
rating allows their use in many high side applications,
while the low drift and offset ensure accuracy across a
wide range of operating conditions. The LTC6102-1 is a
version of the LTC6102 that includes a low power disable
mode to conserve system standby power.
The LTC6102/LTC6102HV monitor current via the voltage
across an external sense resistor (shunt resistor). Internal
circuitry converts input voltage to output current, allowing
a small sense signal on a large common mode voltage to
be translated to a ground-referred signal. Low DC offset
allows the use of very low shunt resistor values and large
gain-setting resistors. As a result, power loss in the shunt
is reduced.
The wide operating supply and high accuracy make the
LTC6102 ideal for a large array of applications, from auto-
motive, to industrial and power management. A maximum
input sense voltage of 2V allows a wide range of currents
and voltages to be monitored. Fast response makes the
LTC6102 the perfect choice for load current warnings and
shutoff protection control.
All versions of the LTC6102 are available in 8-lead MSOP
and 3mm × 3mm DFN packages.
Typical Application
10A Current Sense with 10mA Resolution and 100mW
Maximum Dissipation
+
V_SENSE
1mΩ
–
R_IN
20Ω
+IN
5V TO ⁺
105V
L
O
V^–
A
D
+–
–INS
–INF
V⁺
V_REG
0.1µF
5V
1µF
LTC6102
OUT
V_OUT
R_OUT
4.99k
LTC2433-1
TO µP
V_OUT
=
R_OUT
R_IN
•
V_SENSE
=
249.5V_SENSE
6102 TA01
*PROPER SHUNT SELECTION COULD ALLOW
MONITORING OF CURRENTS IN EXCESS OF 1000A
For more information www.linear.com/LTC6102
Dynamic Current
Measurement Range
110
R_SENSE = 100mΩ
100
Max V_SENSE = 1V
90
80
70 ^RSENSE ^{= 10mΩ}
Max V_SENSE = 100µV
60
50
DYNAMIC RANGE RELATIVE
40
TO 10µV OFFSET VOLTAGE
30
20
0.0001
0.001
0.01
0.1
1
MAXIMUM SENSE VOLTAGE (V)
6102 TA01b
6102fe
1