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LT3092
1
3092fb
TYPICAL APPLICATION
DESCRIPTION
200mA 2-Terminal
Programmable Current Source
The LT
®
3092 is a programmable 2-terminal current
source. It requires only two resistors to set an output
current between 0.5mA and 200mA. A multitude of analog
techniques lend themselves to actively programming the
output current. The LT3092 is stable without input and
output capacitors, offering high DC and AC impedance. This
feature allows operation in intrinsically safe applications.
The SET pin features 1% initial accuracy and low tem-
perature coeffi cient. Current regulation is better than
10ppm/V from 1.5V to 40V.
The LT3092 can operate in a 2-terminal current source
confi guration in series with signal lines. It is ideal for driv-
ing sensors, remote supplies, and as a precision current
limiter for local supplies.
Internal protection circuitry includes reverse-battery and
reverse-current protection, current limiting and thermal
limiting. The LT3092 is offered in the 8-lead TSOT-23,
3-lead SOT-223 and 8-lead 3mm × 3mm DFN packages.
Adjustable 2-Terminal Current Source
FEATURES
APPLICATIONS
n
Programmable 2-Terminal Current Source
n
Maximum Output Current: 200mA
n
Wide Input Voltage Range: 1.2V to 40V
n
Input/Output Capacitors Not Required
n
Resistor Ratio Sets Output Current
n
Initial Set Pin Current Accuracy: 1%
n
Reverse-Voltage Protection
n
Reverse-Current Protection
n
<0.001%/V Line Regulation Typical
n
Current Limit and Thermal Shutdown Protection
n
Available in 8-Lead SOT-23, 3-Lead SOT-223 and
8-Lead 3mm × 3mm DFN Packages
n
2-Terminal Floating Current Source
n
GND Referred Current Source
n
Variable Current Source
n
In-Line Limiter
n
Intrinsic Safety Circuits
SET Pin Current vs Temperature
3092 TA01a
IN
SET OUT
+
–
LT3092
10µA
R
OUT
R
SET
V
IN
– V
OUT
= 1.2V TO 40V
IµA
R
R
SOURCE
SET
OUT
= 10 •
TEMPERATURE (°C)
–50
9.900
SET PIN CURRENT (µA)
9.950
10.000
10.050
–25
0
25 50 10075 125
10.100
9.925
9.975
10.025
10.075
150
3092 TA01b
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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