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LTC4217IFE-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC4217IFE-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 18 page LTC4217 4 4217fc ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into pins are positive, all voltages are referenced to GND unless otherwise specified. Note 3: An internal clamp limits the GATE pin to a maximum of 6.5V above OUT. Driving this pin to voltages beyond the clamp may damage the device. Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDD = 12V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Inputs IIN OV, UV, FB Pin Input Current VIN = 1.2V, LTC4217 l 0±1 μA RIN OV, UV, FB Pin Input Resistance LTC4217-12 l 13 18 23 k Ω VTH OV, UV, FB Pin Threshold Voltage VIN Rising l 1.21 1.235 1.26 V ΔVOV(HYST) OV Pin Hysteresis l 10 20 30 mV ΔVUV(HYST) UV Pin Hysteresis l 50 80 110 mV VUV(RTH) UV Pin Reset Threshold Voltage VUV Falling l 0.55 0.62 0.7 V ΔVFB(HYST) FB Pin Power Good Hysteresis l 10 20 30 mV RISET ISET Pin Output Resistor l 19.5 20 20.5 k Ω Outputs VOL PG, FLT Pin Output Low Voltage IOUT = 2mA l 0.4 0.8 V IOH PG, FLT Pin Input Leakage Current VOUT = 30V l 0 ±10 μA VTIMER(H) TIMER Pin High Threshold VTIMER Rising l 1.2 1.235 1.28 V VTIMER(L) TIMER Pin Low Threshold VTIMER Falling l 0.1 0.21 0.3 V ITIMER(UP) TIMER Pin Pull-Up Current VTIMER = 0V l –80 –100 –120 μA ITIMER(DN) TIMER Pin Pull-Down Current VTIMER = 1.2V l 1.4 2 2.6 μA ITIMER(RATIO) TIMER Pin Current Ratio ITIMER(DN)/ITIMER(UP) l 1.6 2 2.7 % AIMON IMON Pin Current Gain IOUT = 2A l 47.5 50 52.5 μA/A IOFF(IMON) IMON Pin Offset Current IOUT = 132mA l 0 ±7.5 μA IGATE(UP) Gate Pull-Up Current Gate Drive On, VGATE = VOUT = 12V l –19 –24 –29 μA IGATE(DN) Gate Pull-Down Current Gate Drive Off, VGATE = 18V, VOUT = 12V l 190 250 340 μA IGATE(FST) Gate Fast Pull-Down Current Fast Turn Off, VGATE = 18V, VOUT = 12V 140 mA AC Characteristics tPHL(GATE) Input High (OV), Input Low (UV) to Gate Low Propagation Delay VGATE < 16.5V Falling l 810 μs tPHL(ILIM) Short-Circuit to Gate Low VFB = 0, Step ISENSE to 1.2A, VGATE < 16.5V Falling l 15 μs tD(ON) Turn-On Delay Step VUV to 2V, VGATE > 13V l 50 100 150 ms tD(CB) Circuit Breaker Filter Delay Time (Internal) VFB = 0V, Step ISENSE to 1.2A l 1.5 2 2.7 ms tD(AUTO-RETRY) Auto-Retry Turn-On Delay (Internal) l 50 100 150 ms Note 5: TJ is calculated from the ambient temperature, TA, and power dissipation, PD, according to the formula: LTC4217DHC, LTC4217DHC-12: TJ = TA + (PD • 43°C/W) LTC4217FE: TJ = TA + (PD • 38°C/W) Note 6: For the DHC package, switch on-resistance is guaranteed by design and test correlation. |
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