LT3081
4
3081fc
elecTrical characTerisTics
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Unless otherwise specified, all voltages are with respect to V
OUT
.
The LT3081 is tested and specified under pulse load conditions such
that T
J
≈ T
A
. The LT3081E is tested at T
A
= 25°C and performance is
guaranteed from 0°C to 125°C. Performance of the LT3081E over the
full –40°C and 125°C operating temperature range is assured by design,
characterization, and correlation with statistical process controls. The
LT3081I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3081MP is 100% tested and guaranteed
over the –55°C to 150°C operating junction temperature range. The
LT3081H is tested at 150°C operating junction temperature. High junction
temperatures degrade operating lifetimes. Operating lifetime is degraded at
junction temperatures greater than 125°C.
Note 3:
Minimum load current is equivalent to the quiescent current of
the part. Since all quiescent and drive current is delivered to the output
of the part, the minimum load current is the minimum current required to
maintain regulation.
Note 4:
For the LT3081, dropout is specified as the minimum input-to-
output voltage differential required supplying a given output current.
Note 5:
Adding a small capacitor across the reference current resistor
lowers output noise. Adding this capacitor bypasses the resistor shot
noise and reference current noise; output noise is then equal to error
amplifier noise (see Applications Information section).
Note 6:
Diodes with series 400Ω resistors clamp the SET pin to the
OUT pin. These diodes and resistors only carry current under transient
overloads.
Note 7:
Load regulation is Kelvin sensed at the package.
Note 8:
This IC includes overtemperature protection that protects the
device during momentary overload conditions. Junction temperature
exceeds the maximum operating junction temperature when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
Note 9:
The TEMP pin output current represents the average die junction
temperature. Due to power dissipation and thermal gradients across the
die, the TEMP pin output current measurement does not guarantee that
absolute maximum junction temperature is not exceeded.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TEMP Output Current (Note 9)
T
J
> 5°C
1
µA/°C
TEMP Output Current Absolute Error (Note 9)
0°C <T
J
≤ 125°C
125°C <T
J
≤ 150°C
–10
–15
10
15
µA
µA
Reference Current RMS Output Noise (Note 5)
10Hz ≤ f ≤ 100kHz
5.7
nA
RMS
Error Amplifier RMS Output Noise (Note 5)
I
LOAD
= 1.5A, 10Hz ≤ f ≤ 100kHz, C
OUT
=10µF,
C
SET
= 0.1µF
27
µV
RMS
Ripple Rejection
V
RIPPLE
= 0.5V
P-P
, I
LOAD
= 0.1A, C
SET
= 0.1µF,
C
OUT
=10µF, V
IN
= V
OUT(NOMINAL)
+ 3V
f = 120Hz
f = 10kHz
f = 1MHz
75
90
75
20
dB
dB
dB
Thermal Regulation, I
SET
10ms Pulse
0.003
%/W
