Datasheet LTC6655 (Analog Devices) - 5

LTC6655
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 Short-Circuit Current Short VOUT to GND 20 mA Short VOUT to VIN 20 mA Shutdown Pin (SHDN) Logic High Input Voltage l 2.0 V Logic High Input Current, SHDN = 2V l 12 µA Logic Low Input Voltage l 0.8 V Logic Low Input Current, SHDN = 0.8V l 15 µA Supply Current No Load 5 7 mA l 7.5 mA Shutdown Current SHDN Tied to GND l 20 µA Output Voltage Noise (Note 7) 0.1Hz ≤ f ≤ 10Hz 0.25 ppmP-P 10Hz ≤ f ≤ 1kHz 0.67 ppmRMS Turn-On Time 0.1% Settling, COUT = 2.7µF 400 µs Long-Term Drift of Output Voltage (Note 8) LTC6655MS8 60 ppm/√kHr LTC6655LS8 20 ppm/√kHr Hysteresis (Note 9) LTC6655MS8 ∆T = 0°C to 70°C 20 ppm ∆T = –40°C to 85°C 30 ppm ∆T = –40°C to 125°C 60 ppm LTC6655LS8 ∆T = 0°C to 70°C 5 ppm ∆T = –40°C to 85°C 30 ppm ∆T = –40°C to 125°C 80 ppm
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings noise measurements will yield larger and smaller peak values in a given may cause permanent damage to the device. Exposure to any Absolute measurement interval. By repeating the measurement for 1000 intervals, Maximum Rating condition for extended periods may affect device each 10 seconds long, it is shown that there are time intervals during reliability and lifetime. which the noise is higher than in a typical single interval, as predicted by
Note 2:
Precision may be affected if the parts are stored outside of the statistical theory. In general, typical values are considered to be those for specified temperature range. Large temperature changes may cause which at least 50% of the units may be expected to perform similarly or changes in device performance due to thermal hysteresis. For best better. For the 1000 interval test, a typical unit will exhibit noise that is performance, extreme temperatures should be avoided whenever possible. less than the typical value listed in the Electrical Characteristics table in
Note 3:
The stated temperature is typical for soldering of the leads during more than 50% of its measurement intervals. See Application Note 124 for manual rework. For detailed IR reflow recommendations, refer to the noise testing details. RMS noise is measured with a spectrum analyzer in a Applications Information section. shielded environment.
Note 4:
Temperature coefficient is measured by dividing the maximum
Note 8:
Long-term stability typically has a logarithmic characteristic and change in output voltage by the specified temperature range. 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
Note 5:
Load regulation is measured on a pulse basis from no load to one-third that of the first thousand hours with a continuing trend toward the specified load current. Load current does not include the 2mA sense reduced drift with time. Long-term stability is also affected by differential current. Output changes due to die temperature change must be taken into stresses between the IC and the board material created during board account separately. assembly.
Note 6:
Excludes load regulation errors. Minimum supply for the
Note 9:
Hysteresis in output voltage is created by mechanical stress LTC6655-1.25, LTC6655-2.048 and LTC6655-2.5 is set by internal that differs depending on whether the IC was previously at a higher or circuitry supply requirements, regardless of load condition. Minimum lower temperature. Output voltage is always measured at 25°C, but supply for the LTC6655-3, LTC6655-3.3, LTC6655-4.096 and LTC6655-5 the IC is cycled to the hot or cold temperature limit before successive is specified by load current. measurements. Hysteresis is roughly proportional to the square of the
Note 7:
Peak-to-peak noise is measured with a 2-pole highpass filter at temperature change. For instruments that are stored at well controlled 0.1Hz and 3-pole lowpass filter at 10Hz. The unit is enclosed in a still-air temperatures (within 20 or 30 degrees of operational temperature), environment to eliminate thermocouple effects on the leads, and the hysteresis is usually not a significant error source. Typical hysteresis is the test time is 10 seconds. Due to the statistical nature of noise, repeating worst case of 25°C to cold to 25°C or 25°C to hot to 25°C, preconditioned by one thermal cycle. 6655ff For more information www.linear.com/LTC6655 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Available Options Electrical Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts