Datasheet LT8711 (Analog Devices) - 3

LT8711
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBIAS = 12V, unless otherwise noted (Note 3). PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range VEXTVCC = 0V l 4.5 42 V VEXTVCC = 4.5V l 0 42 V Quiescent Current in Normal Operation VEN/FBIN = 2.5V, Not Switching 2.0 2.5 mA (IVIN + IEXTVCC + IBIAS) Quiescent Current in Burst Mode Operation VFB = VFB_REG + 3mV 15 25 µA (IVIN + IEXTVCC + IBIAS) Quiescent Current in Shutdown VEN/FBIN = 0V 1 2 µA (IVIN + IEXTVCC + IBIAS) FB Output Regulation Voltage, VFB_REG l 784 800 816 mV 795 800 805 mV FB Line Regulation 4.5V ≤ VIN ≤ 42V 0.01 0.05 %/V FB Pin Input Bias Current VFB = 0.8V l –50 0 50 nA Error Amp Transconductance ∆I = ±5µA 250 µmhos Error Amp Voltage Gain 90 dB Maximum Current Sense Voltage, Minimum Duty Cycle l 46 50 54 mV VCSP – VCSN Maximum Duty Cycle l 26 33 40 mV Switching Frequency, fOSC RT = 30.3k l 675 750 825 kHz RT = 247k l 85 100 115 kHz Switching Frequency Range Free-Running l 85 825 kHz Synchronizing l 140 750 kHz SYNC Input Voltage High l 1.3 V SYNC Input Voltage Low l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V, fSYNC = 500kHz 20 80 % Recommended SYNC Ratio fSYNC/fOSC 0.8 1.2 INTVCC Voltage IINTVCC = 10mA l 4.75 5 5.25 V INTVCC Line Regulation 6V ≤ VIN ≤ 42V, VEXTVCC = 0, IINTVCC = 10mA –0.003 –0.03 %/V 6V ≤ VEXTVCC ≤ 42V, VVIN = 0, IINTVCC = 10mA –0.003 –0.03 %/V INTVCC Load Regulation IINTVCC = 0mA to 40mA –1 –2 % INTVCC Maximum External Load Current Internal Load Current = 40mA 10 mA INTVCC Undervoltage Lockout INTVCC Rising l 3.9 4.1 4.3 V INTVCC Falling l 3.45 3.6 3.75 V INTVCC Undervoltage Lockout Hysteresis 500 mV INTVEE Voltage, VBIAS – VINTVEE IINTVEE = 10mA l 4.85 5.15 5.4 V INTVEE Undervoltage Lockout, VBIAS – VINTVEE VBIAS – VINTVEE Rising l 3.6 3.85 4.1 V VBIAS – VINTVEE Falling l 3.4 3.6 3.8 V INTVEE Undervoltage Lockout Hysteresis, 250 mV VBIAS – VINTVEE BG Rise Time CBG = 3.3nF (Note 4) 14 ns BG Fall Time CBG = 3.3nF (Note 4) 12 ns TG Rise Time CTG = 3.3nF (Note 4) 11 ns TG Fall Time CTG = 3.3nF (Note 4) 14 ns BG and TG Non-Overlap Time TG Rising to BG Rising, CBG = CTG = 3.3nF (Note 4) 70 ns BG and TG Non-Overlap Time BG Falling to TG Falling, CBG = CTG = 3.3nF (Note 4) 70 ns Minimum On-Time CBG = CTG = 3.3nF 100 ns Rev A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Start-Up and Fault Sequence Operation Applications Information Appendix Typical Applications Package Description Typical Application Related Parts