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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3370 датащи(PDF) 4 Page - Linear Technology |
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LTC3370 датащи(HTML) 4 Page - Linear Technology |
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4 / 24 page  LTC3370 4 3370fb For more information www.linear.com/LTC3370 elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VINA-H = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC VCC Voltage Range l 2.7 5.5 V VCC(UVLO) Undervoltage Threshold on VCC VCC Voltage Falling VCC Voltage Rising l l 2.325 2.425 2.45 2.55 2.575 2.675 V V IVCC(ALLOFF) VCC Input Supply Current All Switching Regulators in Shutdown 0 2.5 µA IVCC VCC Input Supply Current One Buck Active PLL/MODE = 0V, RT = 400k, VFB(BUCK) = 0.85V PLL/MODE = 2MHz 45 170 70 250 µA µA fOSC Internal Oscillator Frequency VRT = VCC, PLL/MODE = 0V VRT = VCC, PLL/MODE = 0V RT = 400k, PLL/MODE = 0V l l 1.8 1.75 1.8 2 2 2 2.2 2.25 2.2 MHz MHz MHz fPLL/MODE Synchronization Frequency tLOW, tHIGH > 40ns l 1 3 MHz VPLL/MODE PLL/MODE Level High PLL/MODE Level Low For Synchronization For Synchronization l l 1.2 0.4 V V VRT RT Servo Voltage RT = 400k l 780 800 820 mV Temp Monitor VTEMP(ROOM) TEMP Voltage at 25°C 180 220 260 mV ΔVTEMP/°C VTEMP Slope 7 mV/°C OT Overtemperature Shutdown 170 °C OT Hyst Overtemperature Hysteresis 10 °C 1A Buck Regulators VIN Buck Input Voltage Range l 2.25 5.5 V VOUT Buck Output Voltage Range l VFB VIN V VIN(UVLO) Undervoltage Threshold on VIN VIN Voltage Falling VIN Voltage Rising l l 1.95 2.05 2.05 2.15 2.15 2.25 V V IVIN Burst Mode Operation Input Current Forced Continuous Mode Operation Input Current Shutdown Input Current VFB = 0.85V (Note 4) ISW(BUCK) = 0µA, FB = 0V 18 400 0 30 600 2.5 µA µA µA IFWD PMOS Current Limit (Note 5) 1.9 2.3 2.7 A VFB1 Feedback Regulation Voltage for Buck 1 l 792 800 808 mV VFB Feedback Regulation Voltage for Bucks 2-4 l 780 800 820 mV IFB Feedback Leakage Current VFB = 0.85V –50 50 nA DMAX Maximum Duty Cycle VFB = 0V l 100 % RPMOS PMOS On-Resistance ISW = 100mA 300 mΩ RNMOS NMOS On-Resistance ISW = –100mA 240 mΩ ILEAKP PMOS Leakage Current EN = 0 –2 2 µA ILEAKN NMOS Leakage Current EN = 0 –2 2 µA tSS Soft-Start Time 1 ms VPGOOD(FALL) Falling PGOOD Threshold for Buck 1 % of Regulated VFB 96.8 98 99.2 % Falling PGOOD Threshold for Bucks 2 to 4 % of Regulated VFB 93 95 97 % VPGOOD(HYS) PGOOD Hysteresis for Bucks 1 to 4 % of Regulated VFB 0.3 % |
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