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LTC3370 数据表(PDF) 5 Page - Linear Technology |
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LTC3370 数据表(HTML) 5 Page - Linear Technology |
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5 / 44 page  LTC3372 5 Rev. A For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VOUT = VINA-H = 3.3V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS High Voltage Buck Controller VOUT Regulated Output Voltage (Note 5) ITH = 0.7V to 2V VOUTPRG = INTVCC, VIN = 6V to 60V VOUTPRG = GND, VIN = 4.5V to 60V l l 4.875 3.217 5.000 3.300 5.125 3.383 V V VRUN RUN Pin Controller Enable Threshold RUN Pin Voltage Rising Hysteresis 1.17 1.22 50 1.27 V mV IRUN RUN Pin Pull-Up Current RUN = 0V 0.5 μA gm Error Amplifier Transconductance (Note 5) ITH = 1.2V, Sink/Source 5μA 2 mS ITRACK/SS Soft-Start Charge Current TRACK/SS = 0V 7 10 14 μA ISENSE+ SENSE+ Pin Current ±1 μA VSENSE(MAX) Maximum Current Sense Threshold SENSE– = 3.3V l 68 75 82 mV DMAX(HV) Maximum Duty Cycle In Dropout RRT = 400k 97.5 98 % TG Top Gate Pull-Up On-Resistance Top Gate Pull-Down On-Resistance 2.3 1.5 Ω Ω BG Bottom Gate Pull-Up On-Resistance Bottom Gate Pull-Down On-Resistance 2.4 1.1 Ω Ω tD(TG/BG) Delay Time, Top Gate Off to Bottom Gate On (Note 6) 40 ns tD(BG/TG) Delay Time, Bottom Gate Off to Top Gate On (Note 6) 18 ns tON(MIN) Minimum On-Time (Top Gate) (Note 7) 60 ns PGOOD PGOOD Pin Voltage When Low PGOOD Pin Leakage Current When High IPGOOD = 2mA PGOOD = 5V 0.2 0.4 1 V μA UV VOUT/EXTVCC Pin Undervoltage Threshold Falling, Relative to Regulated VOUT Hysteresis –5 –7.5 2.5 –10 % % OV VOUT/EXTVCC Pin Overvoltage Threshold Rising, Relative to Regulated VOUT Hysteresis +5 +7.5 2.5 +10 % % SENSE– Pin Overvoltage Threshold Rising, Relative to Regulated VOUT Hysteresis +15 2.5 % % tPGOOD PGOOD Delay for Reporting OV/UV Fault PGOOD High to Low 40 μs INTVCC No Load Internal VCC Regulated Voltage INTVCC Voltage Load Regulation 6V < VIN < 60V IINTVCC = 0mA to 50mA VOUT = 3.3V 4.9 5.1 –1 5 –2.5 5.3 –2 V % V Ω No Load Internal VCC Voltage Source Resistance IINTVCC = 0mA to 50mA VOUT = 5V VOUT Threshold for INTVCC Switchover from VIN to VOUT VOUT Rising Hysteresis 4.5 4.7 0.25 4.9 V V Undervoltage Lockout (UVLO) Threshold on INTVCC INTVCC Voltage Rising INTVCC Voltage Falling l l 3.6 4.0 3.8 4.25 4.0 V V Internal Bias Start Up Time VOUT = 0V 1.2 ms Oscillator and Phase-Locked Loop fOSC Frequency of Internal Oscillator (LV Regulators’ Switching Frequency) VRT = INTVCC VRT = INTVCC RRT = 400k l l 1.9 1.75 1.85 2 2 2 2.1 2.25 2.15 MHz MHz MHz fSW HV Controller Switching Frequency 1/6•fOSC kHz fPLL/MODE Synchronization Frequency Range tLOW, tHIGH > 60ns l 1 3 MHz VPLL/MODE PLL/MODE Level High PLL/MODE Level Low For Synchronization For Synchronization l l 1.3 0.25 V V VRT RT Servo Voltage RRT = 400k l 770 800 825 mV |
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