LT1461-2.5 Datasheet, PDF (3/12 Pages) –

LT1461-2.5
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the specified temperature
range, otherwise specifications are at T_A = 25°C. V_IN – V_OUT = 0.5V, Pin 3 = 2.4V, C_L = 2µF, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Line Regulation
(V_OUT + 0.5V) ≤ V_IN ≤ 20V
q
2
8
12
ppm/V
ppm/V
LT1461DHS8
q
15
50
ppm/V
Load Regulation Sourcing (Note 6)
V_IN = V_OUT + 2.5V
0 ≤ I_OUT ≤ 50mA
12
30
ppm/mA
q
40
ppm/mA
Dropout Voltage
Output Current
Shutdown Pin
LT1461DHS8, 0 ≤ I_OUT ≤ 10mA
q
50
V_IN – V_OUT, V_OUT Error = 0.1%
I_OUT = 0mA
I_OUT = 1mA
q
I_OUT = 10mA
q
I_OUT = 50mA, I and C Grades Only q
0.06
0.13 0.3
0.20 0.4
1.50 2.0
Short V_OUT to GND
100
Logic High Input Voltage
q 2.4
Logic High Input Current, Pin 3 = 2.4V q
2
15
ppm/mA
V
V
V
V
mA
V
µA
Logic Low Input Voltage
q
Logic Low Input Current, Pin 3 = 0.8V q
0.8
V
0.5
4
µA
Supply Current
No Load
35
50
µA
q
70
µA
Shutdown Current
R_L = 1k, Pin 3 = 0.8V
25
35
µA
q
55
µA
Output Voltage Noise (Note 7)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
Long-Term Drift of Output Voltage, SO-8 Package (Note 8) See Applications Information
20
µV_P-P
8
ppm_P-P
24
µV_RMS
9.6
ppm_RMS
60
ppm/√kHr
Thermal Hysteresis (Note 9)
∆T = 0°C to 70°C
∆T = – 40°C to 85°C
∆T = – 40°C to 125°C
40
ppm
70
ppm
120
ppm
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1461 is guaranteed functional over the operating
temperature range of – 40°C to 125°C.
Note 3: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 4: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1461, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 5: Temperature coefficient is calculated from the minimum and
maximum output voltage measured at T_MIN, Room and T_MAX as follows:
TC = (V_OMAX – V_OMIN)/(T_MAX – T_MIN)
Incremental slope is also measured at 25°C.
Note 6: Load regulation is measured on a pulse basis from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 7: Peak-to-peak noise is measured with a single pole highpass filter
at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-
air environment to eliminate thermocouple effects on the leads. The test
time is 10 sec. RMS noise is measured with a single pole highpass filter at
10Hz and a 2-pole lowpass filter at 1kHz. The resulting output is full-wave
rectified and then integrated for a fixed period, making the final reading an
average as opposed to RMS. A correction factor of 1.1 is used to convert
from average to RMS and a second correction of 0.88 is used to correct
for the nonideal bandpass of the filters.
Note 8: Long-term drift typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before
that time. Total drift in the second thousand hours is normally less than
one third that of the first thousand hours with a continuing trend toward
reduced drift with time. Long-term drift will also be affected by differential
stresses between the IC and the board material created during board
assembly.
See the Applications Information section.
Note 9: Hysteresis in output voltage is created by package stress that
depends on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled hot or cold before successive measurements. Hysteresis is roughly
proportional to the square of the temperature change. Hysteresis is not
normally a problem for operational temperature excursions where the
instrument might be stored at high or low temperature. See Applications
Information.
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