Datasheet LTC3803 (Analog Devices) - 3

LTC3803
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C. VCC = 8V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCLAMP1mA VCC Shunt Regulator Voltage at 1mA ICC = 1mA, VITH/RUN = 0V LTC3803E l 8.3 9.4 10.3 V LTC3803H, LTC3803I l 8.3 9.4 10.5 V LTC3803MP l 8 9.4 10.5 V VCLAMP25mA VCC Shunt Regulator Voltage at 25mA ICC = 25mA, VITH/RUN = 0V LTC3803E l 8.4 9.5 10.5 V LTC3803H, LTC3803I l 8.4 9.5 10.7 V LTC3803MP l 8.1 9.5 10.7 V VMARGIN VCLAMP1mA – VTURNON Margin LTC3803E l 0.05 0.6 V LTC3803H, LTC3803I, LTC3803MP l 0.03 0.6 V ICC Input DC Supply Current in Normal (Note 4) Operation VITH/RUN = 1.3V 240 350 μA ICC(UV) Input DC Supply Current in Undervoltage VCC = VTURNON – 100mV LTC3803E l 40 90 μA LTC3803H, LTC3803I, LTC3803MP l 40 110 μA VITHSHDN Shutdown Threshold (at ITH/RUN) VCC > VTURNON, VITH/RUN Falling LTC3803E l 0.15 0.28 0.45 V LTC3803H, LTC3803I, LTC3803MP l 0.09 0.28 0.46 V IITHSTART Start-Up Current Source VITH/RUN = 0V 0.2 0.3 0.4 μA VFB Regulated Feedback Voltage (Note 5) LTC3803E: 0°C ≤ TJ ≤ 85°C 0.788 0.800 0.812 V –40°C ≤ TJ ≤ 85°C l 0.780 0.800 0.816 V LTC3803I: 0°C ≤ TJ ≤ 85°C 0.788 0.800 0.812 V –40°C ≤ TJ ≤ 125°C l 0.780 0.800 0.820 V LTC3803H: 0°C ≤ TJ ≤ 85°C 0.788 0.800 0.812 V –40°C ≤ TJ ≤ 150°C l 0.780 0.800 0.820 V LTC3803MP: 0°C ≤ TJ ≤ 85°C 0.788 0.800 0.812 V –55°C ≤ TJ ≤ 150°C l 0.780 0.800 0.820 V gm Error Amplifi er Transconductance ITH/RUN Pin Load = ±5μA (Note 5) 200 333 500 μA/V ΔVO(LINE) Output Voltage Line Regulation (Note 5) 0.05 mV/V ΔVO(LOAD) Output Voltage Load Regulation ITH/RUN Sinking 5μA (Note 5) 3 mV/μA ITH/RUN Sourcing 5μA (Note 5) 3 mV/μA IFB VFB Input Current (Note 5) 10 50 nA fOSC Oscillator Frequency VITH/RUN = 1.3V 180 200 240 kHz DCON(MIN) Minimum Switch On Duty Cycle VITH/RUN = 1.3V, VFB = 0.8V 6 8 % DCON(MAX) Maximum Switch On Duty Cycle VITH/RUN = 1.3V, VFB = 0.8V 70 80 90 % tRISE Gate Drive Rise Time CLOAD = 3000pF 40 ns tFALL Gate Drive Fall Time CLOAD = 3000pF (Note 7) 40 ns VIMAX Peak Current Sense Voltage RSL = 0 (Note 6) LTC3803E l 90 100 115 mV LTC3803H, LTC3803I l 90 100 120 mV LTC3803MP l 85 100 120 mV ISLMAX Peak Slope Compensation Output Current (Note 7) 5 μA tSFST Soft-Start Time 1.4 ms 3803fc 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATIONS RELATED PARTS