LT3080-1
3
30801fc
For more information www.linear.com/LT3080-1
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
SET Pin Current I
SET
V
IN
= 1V, V
CONTROL
= 2.0V, I
LOAD
= 1mA, T
J
= 25°C
V
IN
≥ 1V, V
CONTROL
≥ 2.0V, 1mA ≤ I
LOAD
≤ 1.1A (Note 9)
l
9.90
9.80
10
10
10.10
10.20
µA
µA
Output Offset Voltage (V
OUT
– V
SET
) V
OS
V
IN
= 1V, V
CONTROL
= 2V, I
OUT
= 1mA
l
–2
–3.5
2
3.5
mV
mV
Load Regulation ∆I
SET
∆V
OS
∆V
OS
∆I
LOAD
=
1mA to 1.1A
∆I
LOAD
=
1mA to 1.1A (Note 8)
∆I
LOAD
=
1mA to 1.1A (Note 8)
l
–0.1
27.5
34
48
nA
mV
mV
Line Regulation (Note 9) ∆I
SET
∆V
OS
V
IN
= 1V to 22V, V
CONTROL
=1V to 22V, I
LOAD
=1mA
V
IN
= 1V to 22V, V
CONTROL
=1V to 22V, I
LOAD
=1mA
l
0.1
0.003
0.5 nA/V
mV/V
Minimum Load Current (Notes 3, 9)
V
IN
= V
CONTROL
= 10V
V
IN
= V
CONTROL
= 22V
l
l
300 500
1
µA
mA
V
CONTROL
Dropout Voltage (Note 4) I
LOAD
= 100mA
I
LOAD
= 1.1A
l
1.2
1.35
1.6
V
V
V
IN
Dropout Voltage (Note 4) I
LOAD
= 100mA
I
LOAD
= 1.1A
l
l
100
350
200
500
mV
mV
CONTROL Pin Current (Note 5) I
LOAD
= 100mA
I
LOAD
= 1.1A
l
l
4
17
6
30
mA
mA
Current Limit (Note 9) V
IN
= 5V, V
CONTROL
= 5V, V
SET
= 0V, V
OUT
= –0.1V
l
1.1 1.4 A
Error Amplifier RMS Output Noise (Note 6) I
LOAD
= 1.1A, 10Hz ≤ f ≤ 100kHz, C
OUT
= 10µF, C
SET
= 0.1µF 40 µV
RMS
Reference Current RMS Output Noise (Note 6) 10Hz ≤ f ≤ 100kHz 1 nA
RMS
Ripple Rejection f = 120Hz, V
RIPPLE
= 0.5V
P-P
, I
LOAD
= 0.2A, C
SET
= 0.1µF, C
OUT
= 2.2µF
f = 10kHz
f = 1MHz
75
55
20
dB
dB
dB
Thermal Regulation, I
SET
10ms Pulse 0.003 %/W
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 LT3080-1 is tested and specified under pulse load conditions such
that T
J
≅ T
A
. The LT3080E-1 is tested at T
A
= 25°C. Performance of the
LT3080E-1 over the full –40°C and 125°C operating temperature range
is assured by design, characterization, and correlation with statistical
process controls. The LT3080I-1 is guaranteed over the full –40°C to
125°C operating junction temperature range.
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 LT3080-1, dropout is caused by either minimum control
voltage (V
CONTROL
) or minimum input voltage (V
IN
). Both parameters are
specified with respect to the output voltage. The specifications represent the
minimum input-to-output differential voltage required to maintain regulation.
Note 5: The CONTROL pin current is the drive current required for the
output transistor. This current will track output current with roughly a 1:60
ratio. The minimum value is equal to the quiescent current of the device.
Note 6: Output noise is lowered by adding a small capacitor across the
voltage setting resistor. Adding this capacitor bypasses the voltage setting
resistor shot noise and reference current noise; output noise is then equal
to error amplifier noise (see the Applications Information section).
Note 7: SET pin is clamped to the output with diodes. These diodes only
carry current under transient overloads.
Note 8: Load regulation is Kelvin sensed at the package.
Note 9: Current limit may decrease to zero at input-to-output differential
voltages (V
IN
– V
OUT
) greater than 22V. Operation at voltages for both IN
and V
CONTROL
is allowed up to a maximum of 36V as long as the difference
between input and output voltage is below the specified differential
(V
IN
– V
OUT
) voltage. Line and load regulation specifications are not
applicable when the device is in current limit.
Note 10: This IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when over-temperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
elecTrical characTerisTics
