LTC6103 Datasheet, PDF (1/16 Pages) Linear Technology – Dual High Voltage, High Side Current Sense Amplifier

FEATURES
■ _{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, 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}
■ _{High Voltage Level Translator}
LTC6103
Dual High Voltage, High Side
Current Sense Amplifier
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.
TYPICAL APPLICATION
Two 16-Bit Current Sense Channels Connected Directly to the LTC2436-1 ADC
V_A+
I_{LOAD –}^VSENS₊^E
V_B+
+^VSENS–^E
I_LOAD
LOAD
8
+INA
R_IN
100Ω
7
–INA
V_SA
R_IN
100Ω
LOAD
6
5
–INB +INB
–+
V_SB
LTC6103 ^OUTA
1
V^– OUTB
42
R_OUT
4.99k
R_OUT
4.99k
5V 1µF
2
1
6
CH1
7
4
LTC2436-1
5
CH0
13
12
TO µP
11
3,8,9,10,14,15,16
6103 TA01a
Step Response
V_SENSE^–
∆V_SENSE^– = 100mV
5.5V
5V
I_OUT = 100µA
V_OUT
0.5V
0V
I_OUT = 0µA
500ns/DIV
T_A = 25°C
V⁺ = 12V
R_IN = 100Ω
R_OUT = 5k
V_SENSE⁺ = V⁺
6103 TA01b
6103f
1