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LTC4230IGN 数据表(PDF) 3 Page - Linear Technology |
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LTC4230IGN 数据表(HTML) 3 Page - Linear Technology |
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3 / 36 page  3 LTC4230 4230f The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC1 = 3.3V, VCC2 = 2.5V,VCC3 = 1.8V unless otherwise noted. (Note 2) ELECTRICAL CHARACTERISTICS ∆VGATEn External N-Channel Gate Drive VGATE1, 2 – VCC1, 2 (for VCC1, 2 = 2.7V, VCC3 = VCC1 – 1V) q 4.5 8 V VGATE3 – VCC3 (for VCC1, 2 = 2.7V, VCC3 = VCC1 – 1V) q 5.5 9 V VGATE1, 2 – VCC1, 2 (for VCC1, 2 = 3.3V, VCC3 = VCC1 – 1V) q 510 V VGATE3 – VCC3 (for VCC1, 2 = 3.3V, VCC3 = VCC1 – 1V) q 611 V VGATEn – VCCn (for VCC1, 2 = 5V, VCC3 = VCC1 – 1V) q 916 V VGATEn – VCCn (for VCC1, 2 = 12V or 15V, q 718 V VCC3 = VCC1 – 1V) VGATEn, 0V GATE n Overvoltage Lockout 0.25 V Threshold VFBn FB n Low Threshold Voltage FB n High to Low Transition q 1.209 1.234 1.259 V ∆VFBn FB n Line Regulation 2.7V ≤ VCC1 ≤ 16.5V 0.5 mV VFBn, HST FB n Hysteresis 3mV VONHI ON High Threshold Voltage ON Low to High Transition q 1.250 1.314 1.380 V VONLO ON Low Threshold Voltage ON High to Low Transition q 1.172 1.234 1.270 V VONHST ON Hysteresis 80 mV IFILTER FILTER Pull-Up Current During Slow Fault Condition q – 2.5 – 2 –1.3 µA FILTER Pull-Down Current During Normal and Reset Conditions q 710 13 µA VFILTER FILTER Threshold Latched Off Threshold, FILTER Low to High q 1.10 1.26 1.42 V VFILTERHST FILTER Threshold Hysteresis –70 mV ITMR TIMER Pull-Up Current TIMER On q –23 – 20 –17 µA TIMER Pull-Down Current TIMER Off, VFAULT = Low q 0.9 1.6 2.3 µA VTIMER = 1.5V 2.5 mA VTMR TIMER Threshold TIMER Low to High q 1.172 1.234 1.27 V TIMER High to Low q 0.3 0.5 V VFAULT FAULT Low Threshold Voltage FAULT High to Low q 1.172 1.234 1.27 V VFAULT, HST FAULT Hysteresis FAULT Low to High 50 mV IFAULT, UP FAULT Pull-Up Current q – 2.5 – 2 – 1.5 µA VOLFAULT Output Low Voltage IFAULT = 1.6mA, VCC1 = 5V q 0.19 0.4 V VOLRESETn Output Low Voltage IRESETn = 1.6mA, VCC1 = 5V q 0.19 0.4 V tGATEFC Fast COMP n Trip to VCB = 0mV to 200mV Step q 0.5 1 µs GATE n Discharging tFAULTSC Slow Comparator Trip to VCB = 0mV to 100mV Step, FILTER Floating 10 µs FILTER High and FAULT Latched 10nF at FILTER Pin to GND q 712 ms tOVPFTR FILTER Comparator Trip to VFILTER = 0V to 5V q 812 µs GATE n Discharging tEXTFAULT FAULT Low to GATE Discharging VFAULT = 5V to 0V q 1.5 3 4.5 µs tRESET Circuit Breaker Reset Time ON Held Low to Guarantee FAULT High q 15 30 µs tOFF Turn-Off Time ON Goes Low to GATE n Off 8 µs SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All current into device pins is positive; all current out of device pins is negative; all voltages are referenced to ground unless otherwise specified. Note 3: An internal zener at the GATE n pin clamps the charge pump voltage to a typical maximum operating voltage of 26V. External overdrive of the GATE n pin beyond the internal zener voltage may damage the part. The GATE n capacitance must be < 0.15 µF at maximum VCC. If a lower GATE n pin voltage is desired, use an external zener diode. |
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