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LTC6655BHMS8-3.3PBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC6655BHMS8-3.3PBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 22 page LTC6655 6655fa elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, VOUT_S connected to VOUT_F, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Noise (Note 7) 0.1Hz ≤ f ≤ 10Hz 10Hz ≤ f ≤ 1kHz 0.25 0.67 ppmP-P ppmRMS Turn-On Time 0.1% Settling, COUT = 2.7µF 400 µs Long-Term Drift of Output Voltage (Note 8) 60 ppm/√kHr Hysteresis (Note 9) ∆T = –0°C to 70°C ∆T = –40°C to 85°C ∆T = –40°C to 125°C 30 35 60 ppm ppm 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: Precision may be affected if the parts are stored outside of the specified temperature range. Large temperature changes may cause changes in device performance due to thermal hysteresis. For best performance, extreme temperatures should be avoided whenever possible. 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: Load regulation is measured on a pulse basis from no load to the specified load current. Load current does not include the 2mA sense current. Output changes due to die temperature change must be taken into account separately. Note 6: Excludes load regulation errors. Minimum supply for the LTC6655-1.25, LTC6655-2.048 and LTC6655-2.5 is set by internal circuitry supply requirements, regardless of load condition. Minimum supply for the LTC6655-3, LTC6655-3.3, LTC6655-4.096 and LTC6655-5 is specified by load current. Note 7: Peak-to-peak noise is measured with a 2-pole highpass filter at 0.1Hz and 3-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads, and the test time is 10 seconds. Due to the statistical nature of noise, repeating noise measurements will yield larger and smaller peak values in a given measurement interval. By repeating the measurement for 1000 intervals, each 10 seconds long, it is shown that there are time intervals during which the noise is higher than in a typical single interval, as predicted by statistical theory. In general, typical values are considered to be those for which at least 50% of the units may be expected to perform similarly or better. For the 1000 interval test, a typical unit will exhibit noise that is less than the typical value listed in the Electrical Characteristics table in more than 50% of its measurement intervals. See Application Note 124 for noise testing details. RMS noise is measured with a spectrum analyzer in a shielded environment. 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 is also affected by differential stresses between the IC and the board material created during board assembly. Note 9: Hysteresis in output voltage is created by mechanical 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 is roughly proportional to the square of the temperature change. For instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature), hysteresis is usually not a significant error source. |
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