LT3080 Просмотр технического описания (PDF) - Linear Technology
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LT3080 Datasheet PDF : 26 Pages
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LT3080
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 11)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SET Pin Current
Output Offset Voltage (VOUT – VSET)
VIN = 1V, VCONTROL = 2V, IOUT = 1mA
ISET VIN = 1V, VCONTROL = 2.0V, ILOAD = 1mA, TJ = 25°C
VIN ≥ 1V, VCONTROL ≥ 2.0V, 1mA ≤ ILOAD ≤ 1.1A (Note 9)
VOS DFN and MSOP Package
SOT-223, DD-Pak and T0-220 Package
9.90 10 10.10 μA
l 9.80 10 10.20 μA
–2
l –3.5
2
mV
3.5
mV
–5
l –6
5
mV
6
mV
Load Regulation
ΔISET ΔILOAD = 1mA to 1.1A
ΔVOS ΔILOAD = 1mA to 1.1A (Note 8)
– 0 .1
nA
l
0.6 1.3
mV
Line Regulation (Note 9)
DFN and MSOP Package
ΔISET VIN = 1V to 25V, VCONTROL = 2V to 25V, ILOAD = 1mA
ΔVOS VIN = 1V to 25V, VCONTROL = 2V to 25V, ILOAD = 1mA
l
0.1 0.5 nA/V
0.003
mV/V
Line Regulation (Note 9)
ΔISET VIN = 1V to 26V, VCONTROL = 2V to 26V, ILOAD = 1mA
SOT-223, DD-Pak and T0-220 Package ΔVOS VIN = 1V to 26V, VCONTROL = 2V to 26V, ILOAD = 1mA
l
0.1 0.5 nA/V
0.003
mV/V
Minimum Load Current (Notes 3, 9)
VIN = VCONTROL = 10V
l
VIN = VCONTROL = 25V (DFN and MSOP Package)
l
VIN = VCONTROL = 26V (SOT-223, DD-Pak and T0-220 Package) l
300 500
μA
1
mA
1
mA
VCONTROL Dropout Voltage (Note 4)
ILOAD = 100mA
ILOAD = 1.1A
1.2
V
l
1.35 1.6
V
VIN Dropout Voltage (Note 4)
ILOAD = 100mA
ILOAD = 1.1A
l
100 200
mV
l
350 500
mV
VCONTROL Pin Current
ILOAD = 100mA
ILOAD = 1.1A
l
46
mA
l
17 30
mA
Current Limit
VIN = 5V, VCONTROL = 5V, VSET = 0V, VOUT = –0.1V
l 1.1 1.4
A
Error Amplifier RMS Output Noise (Note 6)
ILOAD = 1.1A, 10Hz ≤ f ≤ 100kHz, COUT = 10μF, CSET = 0.1μF
40
μVRMS
Reference Current RMS Output Noise (Note 6) 10Hz ≤ f ≤ 100kHz
1
nARMS
Ripple Rejection
f = 120Hz, VRIPPLE = 0.5VP-P, ILOAD = 0.2A, CSET = 0.1μF, COUT = 2.2μF
75
dB
f = 10kHz
55
dB
f = 1MHz
20
dB
Thermal Regulation, ISET
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 VOUT.
The LT3080 is tested and specified under pulse load conditions such that
TJ ≈ TA. The LT3080 E-Grade is 100% tested at TA = 25°C. Performance at
–40°C and 125°C is assured by design, characterization and correlation
with statistical process controls.
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, dropout is caused by either minimum control
voltage (VCONTROL) or minimum input voltage (VIN). 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 VCONTROL 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 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 (VIN–VOUT) greater than 25V (DFN and MSOP package) or 26V
(SOT-223, DD-Pak and T0-220 Package). Operation at voltages for both IN
and VCONTROL is allowed up to a maximum of 36V as long as the difference
between input and output voltage is below the specified differential
(VIN–VOUT) voltage. Line and load regulation specifications are not
applicable when the device is in current limit.
Note 10: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
Note 11: The SOT-223 package connects the IN and VCONTROL pins
together internally. Therefore, test conditions for this pin follow the
VCONTROL conditions listed in the Electrical Characteristics Table.
3080fb
3
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