Datasheet LTC3372 (Analog Devices) - 5

LTC3372
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 l 4.875 5.000 5.125 V VOUTPRG = GND, VIN = 4.5V to 60V l 3.217 3.300 3.383 V VRUN RUN Pin Controller Enable Threshold RUN Pin Voltage Rising 1.17 1.22 1.27 V Hysteresis 50 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 I + SENSE 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 2.3 Ω Top Gate Pull-Down On-Resistance 1.5 Ω BG Bottom Gate Pull-Up On-Resistance 2.4 Ω Bottom Gate Pull-Down On-Resistance 1.1 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 IPGOOD = 2mA 0.2 0.4 V PGOOD Pin Leakage Current When High PGOOD = 5V 1 μA UV VOUT/EXTVCC Pin Undervoltage Threshold Falling, Relative to Regulated VOUT –5 –7.5 –10 % Hysteresis 2.5 % OV VOUT/EXTVCC Pin Overvoltage Threshold Rising, Relative to Regulated VOUT +5 +7.5 +10 % Hysteresis 2.5 % SENSE– Pin Overvoltage Threshold Rising, Relative to Regulated VOUT +15 % Hysteresis 2.5 % tPGOOD PGOOD Delay for Reporting OV/UV Fault PGOOD High to Low 40 μs INTVCC No Load Internal VCC Regulated Voltage 6V < VIN < 60V VOUT = 3.3V 4.9 5.1 5.3 V INTVCC Voltage Load Regulation IINTVCC = 0mA to 50mA –1 –2 % No Load Internal V V 5 V CC Voltage OUT = 5V Source Resistance I –2.5 Ω INTVCC = 0mA to 50mA VOUT Threshold for INTVCC Switchover from VOUT Rising 4.5 4.7 4.9 V VIN to VOUT Hysteresis 0.25 V Undervoltage Lockout (UVLO) Threshold on INTVCC Voltage Rising l 4.0 4.25 V INTVCC INTVCC Voltage Falling l 3.6 3.8 4.0 V Internal Bias Start Up Time VOUT = 0V 1.2 ms
Oscillator and Phase-Locked Loop
fOSC Frequency of Internal Oscillator VRT = INTVCC 1.9 2 2.1 MHz (LV Regulators’ Switching Frequency) VRT = INTVCC l 1.75 2 2.25 MHz RRT = 400k l 1.85 2 2.15 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 For Synchronization l 1.3 V PLL/MODE Level Low For Synchronization l 0.25 V VRT RT Servo Voltage RRT = 400k l 770 800 825 mV Rev. A For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Low Voltage Regulators Applications Information High Voltage Buck Controller Low Voltage Buck Regulators Printed Circuit Board PCB Layout Considerations Typical Applications Package Description Revision History Typical Application Related Parts