LTC1798CS8-3 datasheet(3/8 Pages) LINER

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LTC1798 Series

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage Noise (Note 5)

0.1Hz

≤ f ≤ 10Hz

ppmP-P

Output Voltage Temp Coefficient (Note 6)

TMIN ≤ TJ ≤ TMAX

ppm/

°C

VOUT/VIN

Line Regulation

VIN = (VOUT(NOMINAL) + 0.2V) to 12.6V

120

ppm/V

VOUT/IOUT

Load Regulation (Note 7)

Sourcing 0mA to 10mA

0.1

0.3

mV/mA

Sinking 0mA to 2mA

1.75

4.0

mV/mA

6.5

mV/mA

ISC

Short-Circuit Output Current

VOUT Shorted to GND

VOUT Shorted to VIN

∆VDO

Dropout Voltage (Note 8)

IOUT = 0, ∆VOUT ≤ 0.1%

100

IOUT = 10mA, ∆VOUT ≤ 0.1%

200

VHYST

Output Hysteresis (Note 9)

∆T = –40°C to 85°C

200

ppm

∆T = 0°C to 70°C

ppm

IFB

FB Pin Input Current

LTC1798, OUT = FB

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.

LTC1798-2.5* Dropout Voltage

vs Output Source Current

LTC1798-2.5*

Input Current vs Temperature

LTC1798 Series Output Short-

Circuit Current vs Temperature

*Similar performance characteristics can be expected for all voltage options.

ELECTRICAL CHARACTERISTICS

TYPICAL PERFOR A CE CHARACTERISTICS

OUTPUT SOURCE CURRENT (mA)

100

1798 G01

0.1

TA = 25°C

TEMPERATURE (

°C)

–50 –25

150

1798 G02

025

100 125

VIN = 2.7V

TEMPERATURE (

°C)

–50 –25

150

1798 G03

025

100 125

TA = 25°C

VIN = VOUT(NOM) + 0.2V

OUTPUT

SHORTED

TO VIN

OUTPUT

SHORTED

TO GND

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