LTC6104 Datasheet, PDF (1/16 Pages) Linear Technology – High Voltage, High Side, Bi-Directional Current Sense Amplifi er

FEATURES
■ _{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, VS = 12V}
■ _{Specified for –40°C to 125°C Temperature Range}
■ _{Available in an 8-Lead MSOP Package}
APPLICATIONS
■ _{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.
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.
TYPICAL APPLICATION
TO
CHARGER/LOAD
16-Bit Resolution Bi-Directional Output into LTC1286 ADC
I_LOAD
– ^VSENSE +
R_SENSE
R_IN
R_IN
100Ω 100Ω
+
12V
8
7
6
+INA –INA –INB
5
+INB
A
V_S
–+
B
V_S
V_REF
CURRENT
LTC6104 ^OUT
MIRROR
V^–
1
4
R_OUT
2.5k
C2
0.1µF
R1
C1
+
2.3k
1µF
5V
V_REF V_CC
+IN
CS
LTC1286 CLK
–IN
LT^®1004-2.5
GND
D_OUT
6104 TA01a
TO µP
Step Response
V_SENSE–
6V
∆V_SENSE = 100mV
V_OUT
1.5V ^{IOUT = 100µA}
1V
I_OUT = 0µA
T_A = 25°C
V_S = 12V
R_IN = 100Ω
VR_SOEUNTS⁼_E+^5=k V_S
V_REF = 1V
TIME (1µs/DIV)
6104 G15
6104f
1