LTC1798 Series ELECTRICAL CHARACTERISTICSThe l denotes specifications which apply over the full specified temperaturerange, otherwise specifications are at TA = 25°C. VIN = VOUT(NOMINAL) + 0.2V, IOUT = 0mA unless otherwise noted. FB = OUT for the LTC1798. SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS VIN Input Voltage Range l 12.6 V IIN Input Current FB = OUT for LTC1798 4 6.5 µA l 8.5 µA VOUT Output Voltage (Note 4) LTC1798, FB = OUT 2.3755 2.385 2.3945 V LTC1798 ADJ –0.4 0.4 % LTC1798-2.5 2.4963 2.5 2.5037 V LTC1798-3 2.9955 3 3.0045 V LTC1798-4.1 4.090 4.096 4.102 V LTC1798-5 4.9925 5 5.0075 V LTC1798 All Fixed Options –0.15 0.15 % en Output Voltage Noise (Note 5) 0.1Hz ≤ f ≤ 10Hz 8 ppmP-P TC Output Voltage Temp Coefficient (Note 6) TMIN ≤ TJ ≤ TMAX l 15 40 ppm/°C VOUT/VIN Line Regulation VIN = (VOUT(NOMINAL) + 0.2V) to 12.6V l 30 120 ppm/V VOUT/IOUT Load Regulation (Note 7) Sourcing 0mA to 10mA l 0.1 0.3 mV/mA Sinking 0mA to 2mA 1.75 4 mV/mA l 6.5 mV/mA ISC Short-Circuit Output Current VOUT Shorted to GND 20 40 mA VOUT Shorted to VIN 2 4 mA ∆VDO Dropout Voltage (Note 8) IOUT = 0, ∆VOUT ≤ 0.1% l 100 mV IOUT = 10mA, ∆VOUT ≤ 0.1% l 200 mV VHYST Output Hysteresis (Note 9) ∆T = –40°C to 85°C 200 ppm ∆T = 0°C to 70°C 50 ppm IFB FB Pin Input Current LTC1798, OUT = FB 10 nA Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Note 6: Temperature coefficient is the change in output voltage divided by Maximum Rating condition for extended periods may affect device the nominal output voltage divided by the specified temperature range. reliability and lifetime. Note 7: Load regulation is measured on a pulse basis from no load to the Note 2: The LTC1798 is guaranteed functional over the operating specified load current. Output changes due to die temperature change temperature range of –40°C to 100°C. must be taken into account separately. Note 3: If the part is stored outside of the specified operating temperature Note 8: Dropout voltage is (VIN – VOUT) when VOUT falls to 0.1% below its range, the output may shift due to hysteresis. nominal value at VIN = VOUT + 0.5V. Note 4: ESD (Electostatic Discharge) sensitive device. Extensive use of Note 9: Hysteresis in output voltage is created by package stress that ESD protection devices are used internal to the LTC1798, however, high differs depending on whether the IC was previously at a higher or lower electrostatic discharge can damage or degrade the device. Use proper ESD temperature. Output voltage is always measured at 25°C, but the IC is handling precautions. cycled hot or cold before successive measurements. Hysteresis is not normally a problem for operational temperature excursions where the Note 5: Peak-to-peak noise is measured with a single pole highpass filter instrument might be stored at high or low temperature. at 0.1Hz and 2-pole lowpass filter at 10Hz. 1798fc 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION AVAILABLE OPTIONS ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
