Datasheet

LT3090
11
3090fa
For more information www.linear.com/LT3090
pin FuncTions
(DFN/MSOP)
GND (Pin 8/9): Ground. This pin supplies the LT3090's
quiescent current and the drive current to the NPN pass
transistor. The LT3090's GND pin is highly versatile.
Depending on application’s requirements, it can be tied
to the system ground, a positive voltage, or the OUT pin.
A parasitic substrate diode exists between the LT3090’s
GND and IN pins. Therefore, do not drive GND more than
0.3V below IN during normal operation or during a fault
condition.
OUT (Pins 9, 10/10, 11, 12): Output. These pins supply
power to the load. Tie all OUT pins together for best perfor
-
mance. Use
a minimum output capacitor of 4.7µF with an
ESR
less than 0.5Ω to prevent oscillations. As mentioned
in the Electrical Characteristics table, a minimum load cur
-
rent of 10µA is required to prevent instability. Large load
transient applications require larger output capacitors to
limit peak voltage transients. See the Applications Informa
-
tion section for more information on output capacitance.
A parasitic substrate diode exists between OUT and IN
pins of the LT3090. Therefore, do not drive OUT more
than 0.3V below IN during normal operation or during a
fault condition.
block DiagraM
–
+
50µA
RAIL-TO-RAIL
ERROR AMP
20.25µA
OUT SHDN GND IMONN
0.135Ω
5k
INTERNAL
CURRENT LIMIT
–1.27V
1.23V
BIDIRECTIONAL SHUTDOWN
3090 BD
R
SET
R
LOAD
C
OUT
DRIVER
–
+
–
+
–
+
–
+
–
+
–
+
3k
270Ω
ILIMIN IMONP
POSITIVE OR NEGATIVE
CURRENT MONITOR
PROGRAMMABLE CURRENT LIMIT
2x
1x
225mV
+
–
V
R
ILIM
C
IN
IN
SET
BIAS
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.