LTC1798CS8-4.1(RevA) データシートの表示（PDF） - Linear Technology
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LTC1798CS8-4.1 Datasheet PDF : 8 Pages
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LTC1798 Series
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.
VIN = VOUT(NOMINAL) + 0.2V, IOUT = 0mA unless otherwise noted. FB = OUT for the LTC1798.
SYMBOL
en
TC
VOUT/VIN
VOUT/IOUT
PARAMETER
Output Voltage Noise (Note 5)
Output Voltage Temp Coefficient (Note 6)
Line Regulation
Load Regulation (Note 7)
CONDITIONS
0.1Hz ≤ f ≤ 10Hz
TMIN ≤ TJ ≤ TMAX
VIN = (VOUT(NOMINAL) + 0.2V) to 12.6V
Sourcing 0mA to 10mA
Sinking 0mA to 2mA
ISC
∆VDO
VHYST
IFB
Short-Circuit Output Current
Dropout Voltage (Note 8)
Output Hysteresis (Note 9)
FB Pin Input Current
VOUT Shorted to GND
VOUT Shorted to VIN
IOUT = 0, ∆VOUT ≤ 0.1%
IOUT = 10mA, ∆VOUT ≤ 0.1%
∆T = – 40°C to 85°C
∆T = 0°C to 70°C
LTC1798, OUT = FB
MIN TYP MAX
UNITS
8
ppmP-P
q
15
40
ppm/°C
q
30
120
ppm/V
q
0.1
0.3
mV/mA
1.75
4.0
mV/mA
q
6.5
mV/mA
20
40
mA
2
4
mA
q
100
mV
q
200
mV
200
ppm
50
ppm
10
nA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC1798 is guaranteed functional over the operating
temperature range of – 40°C to 100°C.
Note 3: If the part is stored outside of the specified operating temperature
range, the output may shift due to hysteresis.
Note 4: ESD (Electostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LTC1798, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 5: Peak-to-peak noise is measured with a single pole highpass filter
at 0.1Hz and 2-pole lowpass filter at 10Hz.
Note 6: Temperature coefficient is the change in output voltage divided by
the nominal output voltage divided by the specified temperature range.
Note 7: 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 8: Dropout voltage is (VIN – VOUT) when VOUT falls to 0.1% below its
nominal value at VIN = VOUT + 0.5V.
Note 9: Hysteresis in output voltage is created by package stress that
differs depending 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 not
normally a problem for operational temperature excursions where the
instrument might be stored at high or low temperature.
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1798-2.5* Dropout Voltage
vs Output Source Current
LTC1798-2.5*
Input Current vs Temperature
100
90 TA = 25°C
80
70
60
8
VIN = 2.7V
7
6
5
50
4
40
3
30
2
20
10
1
0
0
0.1
1
10
100
0
–50 –25 0 25 50 75 100 125 150
OUTPUT SOURCE CURRENT (mA)
TEMPERATURE (°C)
1798 G01
1798 G02
*Similar performance characteristics can be expected for all voltage options.
LTC1798 Series Output Short-
Circuit Current vs Temperature
70
TA = 25°C
60 VIN = VOUT(NOM) + 0.2V
50
OUTPUT
SHORTED
TO GND
40
30
20
10
OUTPUT
SHORTED
5
TO VIN
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1798 G03
3
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