LT6658 데이터 시트보기 (PDF) - Linear Technology

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LT6658

Precision Dual Output, High Current, Low Noise, Voltage Reference

Linear Technology 

LT6658

Electrical Characteristics The l denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. VIN = VIN1 = VIN2 = VOUT1,2_F + 2.5V, COUT1,2 = 1µF, ILOAD = 0, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

Ripple Rejection

Turn-On Time

Long Term Drift (Note 8)

VIN1 = VOUT1 + 3V, VRIPPLE = 0.5VP–P, fRIPPLE = 120Hz, ILOAD = 150mA,

COUT1 = 1µF, CNR = 10µF

VIN2 = VOUT2 + 3V, VRIPPLE = 0.5VP–P, fRIPPLE = 120Hz, ILOAD = 50mA,

COUT2 = 1µF, CNR = 10µF

0.1% Settling, CLOAD = 1μF

107

dB

107

dB

160

μs

120

ppm/√kHr

Thermal Hysteresis (Note 9) ∆T = –40°C to 85°C

∆T = –40°C to 125°C

30

ppm

45

ppm

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: Thermal hysteresis can occur during storage at extreme

temperatures.

Note 3: The stated temperature is typical for soldering of the leads during

manual rework. For detailed IR reflow recommendations, refer to the

Applications Information section.

Note 4: Temperature coefficient is measured by dividing the maximum

change in output voltage by the specified temperature range.

Note 5: Line and load regulation are measured on a pulse basis for

specified input voltage or load current ranges. Output changes due to die

temperature change must be taken into account separately.

Note 6: VOUT2 load regulation specification is limited by practical

automated test resolution. Please refer to the Typical Performance

Characteristics section for more information regarding actual typical

performance.

Note 7: Peak-to-peak noise is measured with a 1-pole highpass filter at

0.1Hz and 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 seconds. RMS noise is measured on a spectrum analyzer in

a shielded environment where the intrinsic noise of the instrument is

removed to determine the actual noise of the device.

Note 8: Long-term stability 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 stability will also be affected by

differential stresses between the IC and the board material created during

board assembly.

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 to the hot or cold temperature limit before successive

measurements. Hysteresis measures the maximum output change for the

averages of three hot or cold temperature cycles. For instruments that

are stored at well controlled temperatures (within 20 or 30 degrees of

operational temperature), it’s usually not a dominant error source. Typical

hysteresis is the worst-case of 25°C to cold to 25°C or 25°C to hot to

25°C, preconditioned by one thermal cycle.

Note 10: The full current for ILOAD is 150mA and 50mA for Output 1 and

Output 2, respectively.

6658f

4

For more information www.linear.com/LT6658

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