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LTC3608 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3608 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTC3608 3 3608fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop SVIN Operating Input Voltage Range 4 18 V IQ Input DC Supply Current Normal Shutdown Supply Current 900 15 2000 30 μA μA VFB Feedback Reference Voltage ITH = 1.2V, –40°C to 85°C (Note 3) ITH = 1.2V, –40°C to 125°C (Note 3) l 0.594 0.590 0.600 0.600 0.606 0.610 V V ΔVFB(LINEREG) Feedback Voltage Line Regulation VIN = 4V to 18V, ITH = 1.2V (Note 3) 0.002 %/V ΔVFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) –0.05 –0.3 % IFB Feedback Input Current VFB = 0.6V –5 ±50 nA gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 3) l 1.4 1.7 2 mS VFCB Forced Continuous Threshold l 0.54 0.6 0.66 V IFCB Forced Continuous Pin Current VFCB = 0.6V –1 –2 μA tON On-Time ION = 60μA, VON = 1.5V ION = 60μA, VON = 0V 220 280 110 340 ns ns tON(MIN) Minimum On-Time ION = 180μA, VON = 0V 60 100 ns tOFF(MIN) Minimum Off-Time ION = 30μA, VON = 1.5V 320 500 ns IVALLEY(MAX) Maximum Valley Current VRNG = 0.5V, VFB = 0.56V, FCB = 0V VRNG = 0V, VFB = 0.56V, FCB = 0V l l 5 8 11 16 A A IVALLEY(MIN) Maximum Reverse Valley Current VRNG = 0.5V, VFB = 0.64V, FCB = 0V VRNG = 0V, VFB = 0.64V, FCB = 0V 3.5 5.5 5.5 7.5 7.5 9.5 A A ΔVFB(OV) Output Overvoltage Fault Threshold 7 10 13 % VRUN/SS(ON) RUN Pin Start Threshold l 0.8 1.5 2 V VRUN/SS(LE) RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 4 4.5 V VRUN/SS(LT) RUN Pin Latchoff Threshold RUN/SS Pin Falling 3.5 4.2 V IRUN/SS(C) Soft-Start Charge Current VRUN/SS = 0V –0.5 –1.2 –3 μA IRUN/SS(D) Soft-Start Discharge Current VRUN/SS = 4.5V, VFB = 0V 0.8 1.8 3 μA VIN(UVLO) Undervoltage Lockout INTVCC Falling l 3.4 3.9 V VIN(UVLOR) Undervoltage Lockout Release INTVCC Rising l 3.5 4 V RDS(ON) Top Switch On-Resistance Bottom Switch On-Resistance 10 8 19 14 mΩ mΩ Internal VCC Regulator VINTVCC Internal VCC Voltage 6V < VIN < 18V, VEXTVCC = 4V l 4.7 5 5.5 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 4V –0.1 ±2 % VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, VEXTVCC Rising l 4.5 4.7 V ΔVEXTVCC EXTVCC Switch Drop Voltage ICC = 20mA, VEXTVCC = 5V 150 300 mV ΔVEXTVCC(HYS) EXTVCC Switchover Hysteresis 500 mV PGOOD Output ΔVFBH PGOOD Upper Threshold VFB Rising 7 10 13 % ΔVFBL PGOOD Lower Threshold VFB Falling –7 –10 –13 % ΔVFB(HYS) PGOOD Hysteresis VFB Returning 1 2.5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted. |
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