LTC6102 Datasheet, PDF (1/20 Pages) Linear Technology – Precision Zero Drift Current Sense Amplifi er

LTC6102/LTC6102HV
Precision Zero Drift
Current Sense Amplifier
FEATURES
n _{Supply Range:}
4V to 60V, 70V Absolute Maximum (LTC6102)
5V to 100V, 105V Absolute 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 _{Available in 8-Lead MSOP and 3mm × 3mm}
DFN Packages
APPLICATIONS
n _{Current Shunt Measurement}
n _{Battery Monitoring}
n _{Remote Sensing}
n _{Power Management}
n _{Load Protection}
n _{Motor Control}
n _{Automotive Controls}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTION
The LTC^®6102/LTC6102HV are versatile, high voltage,
high-side current sense amplifiers. Their high supply
voltage rating allows their use in almost any application,
while the low drift and offset ensure accuracy across a
wide range of operating conditions.
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/LTC6102HV ideal for a large array of applications
from automotive 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/LTC6102HV the perfect choice for load
current warnings and shutoff protection control.
The LTC6102/LTC6102HV are available in 8-lead MSOP
and 3mm × 3mm DFN packages.
TYPICAL APPLICATION
10A Current Sense with 10mA Resolution and 100mW
Maximum Dissipation
I_LOAD
V_SENSE
+IN
L
O
V^–
A
D
1mΩ*
R_IN
20Ω
–INS
–INF
V⁺
V_REG
5V TO 105V
0.1μF
5V
1μF
LTC6102HV
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
Dynamic Range vs Maximum Power
Dissipation in R_SENSE at 10A
110
R_SENSE = 100mΩ
100
Max V_SENSE = 1V
90
80
70 ^RSENSE ^{= 10μΩ}
Max V_SENSE = 100μV
60
50
DYNAMIC RANGE RELATIVE
40
TO 10μV MINIMUM V_SENSE
I_SENSE = 10A
30
20
0.001
0.01
0.1
1
10
MAXIMUM POWER DISSIPATION (W)
6102 TA01b
6102fb
1