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MAX8744 датащи(PDF) 4 Page - Maxim Integrated Products |
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MAX8744 датащи(HTML) 4 Page - Maxim Integrated Products |
4 / 36 page High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers 4 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VIN = 12V, both SMPS enabled, FSEL = REF, SKIP = GND, ILIM = LDO5, FBA = LDO5, IREF = ILDO5 = IOUTA = no load, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Soft-Start Ramp Time tSSTART Measured from the rising edge of ON_ to full scale 2ms Soft-Stop Ramp Time tSSTOP Measured from the falling edge of ON_ to full scale 4ms INTERNAL FIXED LINEAR REGULATORS LDO5 Output Voltage VLDO5 ON5 = GND, 6V < VIN < 26V, 0 < ILDO5 < 100mA 4.85 4.95 5.10 V LDO5 Undervoltage-Lockout Fault Threshold Rising edge, hysteresis = 1% (typ) 225 450 mA LDO5 Bootstrap Switch Threshold Rising edge of CSL5, hysteresis = 1% (typ) 4.35 4.55 4.70 V LDO5 Bootstrap Switch Resistance LDO5 to CSL5, VCSL5 = 5V, ILDO5 = 50mA1 5 Ω Short-Circuit Current LDO5 = GND, ON5 = GND 225 450 mA Short-Circuit Current (Switched over to CSL_) LDO5 = GND, VCSL5 > 4.7V 200 425 mA AUXILIARY LINEAR REGULATOR DRVA Voltage Range VDRVA 0.5 26.0 V VFBA = 1.05V, VDRVA = 5V 0.4 DRVA Drive Current VFBA = 0.965V, VDRVA = 5V 10 mA FBA Regulation Threshold VFBA VDRVA = 5V, IDRVA = 1mA (sink) 0.98 1.00 1.02 V FBA Load Regulation VDRA = 5V, IDRVA = 0.5mA to 5mA -1.2 -2.2 % OUTA Shunt Trip Level Rising edge 25 26 27 V FBA Leakage Current VFBA = 1.035V -0.1 +0.1 µA Secondary Feedback Regulation Threshold VDRVA - VOUTA 0V DL5 Pulse Width 1/ 3fOSC µs OUTA Leakage Current IOUTA VDRVA = VOUTA = 25V 50 µA REFERENCE (REF) Reference Voltage VREF LDO5 in regulation, IREF = 0 1.985 2.00 2.015 V Reference Load-Regulation Error ΔVREF IREF = -5µA to +50µA -10 +10 mV REF Lockout Voltage VREF(UVLO) Rising edge, hysteresis = 100mV (typ) 1.90 V FAULT DETECTION Output Overvoltage Trip Threshold (MAX8744 Only) With respect to error-comparator threshold 811 14 % Output Overvoltage Fault Propagation Delay (MAX8744 Only) tOVP 50mV overdrive 10 µs |
Аналогичный номер детали - MAX8744 |
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Аналогичное описание - MAX8744 |
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