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LTC3708EUH Datasheet(PDF) 3 Page - Linear Technology |
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LTC3708EUH Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3708 3 3708fb ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, DRVCC = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ΔVFB(LOADREG)1,2 Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) –0.05 –0.2 % gm(EA)1,2 Error Amplifier Transconductance ITH = 1.2V (Note 3) l 1.2 1.45 1.7 mS tON1,2 On-Time ION = 60μA, VFCB = 0V ION = 30μA, VFCB = 0V 94 186 116 233 138 280 ns ns tON(MIN)1,2 Minimum On-Time ION = 180μA 50 85 ns tOFF(MIN)1,2 Minimum Off-Time ION = 30μA 270 350 ns VSENSE(MAX)1,2 Maximum Current Sense Threshold VRNG = 1V, VFB = 0.565V VRNG = 0V, VFB = 0.565V VRNG = VCC, VFB = 0.565V 125 90 180 143 100 200 160 110 220 mV mV mV VSENSE(MIN)1,2 Minimum Current Sense Threshold VRNG = 1V, VFB = 0.635V VRNG = 0V, VFB = 0.635V VRNG = VCC, VFB = 0.635V –62 –42 –88 mV mV mV ΔVFB(OV)1,2 Overvoltage Fault Threshold 8.5 10 11.5 % ΔVFB(UV)1,2 Undervoltage Fault Threshold –380 –420 –460 mV VRUN/SS(ON) RUN Pin Start Threshold l 0.8 1.3 1.8 V VRUN/SS(LE) RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 2.6 3 3.3 V VRUN/SS(LT) RUN Pin Latchoff Threshold RUN/SS Pin Falling 2.2 2.5 2.8 V IRUN/SS(C) Soft-Start Charge Current VRUN/SS = 0V –0.5 –1.2 –2 μA IRUN/SS(D) Soft-Start Discharge Current VRUN/SS = VRUN/SS(LE), VFB1,2 = 0V 0.8 2 3 μA VCC(UVLO) Undervoltage Lockout VCC Falling 3.2 3.6 V VCC(UVLOR) Undervoltage Lockout Release VCC Rising 3.5 3.8 V TG RUP1,2 TG Driver Pull-Up On-Resistance TG High (Note 6) 2 Ω TG RDOWN1,2 TG Driver Pull-Down On-Resistance TG Low (Note 6) 2 Ω BG RUP1,2 BG Driver Pull-Up On-Resistance BG High (Note 6) 3 Ω BG RDOWN1,2 BG Driver Pull-Down On-Resistance BG Low (Note 6) 1 Ω Tracking ITRACK1,2 TRACK Pin Input Current ITH = 1.2V, VTRACK = 0.2V (Note 3) –100 –150 nA VFB(TRACK1,2) Feedback Voltage at Tracking VTRACK = 0V, ITH = 1.2V (Note 3) VTRACK = 0.2V, ITH = 1.2V (Note 3) VTRACK = 0.4V, ITH = 1.2V (Note 3) –10 190 390 0 200 400 –10 210 410 mV mV mV PGOOD Output ΔVFBH1,2 PGOOD Upper Threshold Either VFB Rising 8.5 10 11.5 % ΔVFBL1,2 PGOOD Lower Threshold Either VFB Falling –8.5 –10 –11.5 % ΔVFB(HYS)1,2 PGOOD Hysteresis VFB Returning 3 5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.1 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 7V ±1 μA PG Delay PGOOD Delay VFB Falling 100 μs Phase-Locked Loops VFCB(DC) Forced Continuous Threshold Measured with a DC Voltage at FCB Pin 1.9 2.1 2.3 V VFCB(AC) Clock Input Threshold Measured with a AC Pulse at FCB Pin 1 1.5 2 V IEXTLPF External Phase Detector Output Current Sourcing Capability Sinking Capability fFCB < fSW1, VEXTLPF = 0V fFCB > fSW1, VEXTLPF = 2.4 20 –20 μA μA |
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