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LTC4245IUHF Datasheet(PDF) 4 Page - Linear Technology |
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LTC4245IUHF Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC4245 4 4245fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VPB(TH) Power Bad Threshold Voltage 12VOUT 5VOUT, VCFG = 0V, Open 5VOUT When VCFG = VCC, 3VOUT VEEOUT, VCFG = 0V ● ● ● ● 10.8 4.5 2.8 –10.8 11.1 4.63 2.9 –11.1 11.4 4.75 3.0 –11.4 V V V V VIN(TH) Logic Input Threshold PGI, PCI_RST#, GPIOn SDA, SCL ● ● 0.8 1.6 1.0 1.8 1.2 2.0 V V IIN Pin Input Current ON, PGI, PCI_RST#, V = 1.2V SDA, SCL, ALERT#, GPIOn, HEALTHY#, LOCAL_PCI_RST#, V = 6V ● 0±1 μA VOL Output Low Voltage SDA, ALERT#, I = 5mA; GPIOn, HEALTHY#, LOCAL_PCI_RST#, I = 3mA ● 0.2 0.4 V VTRI(H) ADR2, ADR3, CFG Input High Threshold ● VCC –0.8 VCC –0.4 VCC –0.2 V VTRI(L) ADRn, CFG Input Low Threshold ● 0.2 0.4 0.8 V ITRI(IN,HL) ADR2, ADR3, CFG High, Low Input Current V = 0V, VCC ● ±80 μA ITRI(IN,Z) ADR2, ADR3, CFG High Z Input Current V = 0.8V, VCC –0.8V ● ±10 μA IADR01(IN) ADR0, ADR1 Input Current VADR0, VADR1 = 0V, VCC ● –30 1 μA ISENSE Sense Pin Input Current 12VSENSE, 5VSENSE, 3VSENSE VEESENSE After Start-Up VSENSE = VIN VVEESENSE = –12V ● ● 0.3 –30 1 –45 μA μA IOUT(ON) OUT Pin Input Current V12VOUT = 12V, VON = 2V V5VOUT = 5V, VON = 2V V3VOUT = 3.3V, VON = 2V VVEEOUT = –12V, VON = 2V ● ● ● ● 200 275 75 –200 280 390 105 –280 μA μA μA μA ROUT(DIS) OUT Pin Discharge Resistance V12VOUT = 6V, VON = 0V V5VOUT = 3V, VON = 0V V3VOUT = 2V, VON = 0V VVEEOUT = –6V, VON = 0V ● ● ● ● 650 125 130 1300 1000 180 190 1800 1800 325 340 3200 Ω Ω Ω Ω IVEEOUT(UP) VEEOUT Pull-Up Current VVEEOUT = 0V ● –36 –54 μA VPXG PRECHARGE Voltage IPRECHARGE = Open, –70mA (Note 6) ● 0.95 1 1.05 V Timer, Soft-Start VTIMER(H) TIMER Pin High Threshold VTIMER Rising ● 2.5 2.56 2.62 V VTIMER(L) TIMER Pin Low Threshold VTIMER Falling ● 0.1 0.23 0.4 V ITIMER TIMER Pin Pull-Up Current During Start-Up, VTIMER = 0V During PGI Timeout, VTIMER = 0V During Auto-Retry, VTIMER = 0V ● ● ● –80 –8 –1.5 –100 –10 –2 –120 –12 –2.5 μA μA μA KTMRATIO TIMER Pin Current Ratio (ITIMER(RTRY)/ITIMER(START)) ● 1.6 2 2.7 % KTMCAP Start-Up Time per TIMER Capacitance ((VTIMER(H) – VTIMER(L))/ITIMER(START)) ● 20 23.3 26 ms/μF ISS SS Pin Pull-Up Current Fast Ramp, VSS = 0V Slow Ramp, VSS = 2V ● ● –16 –1.5 –20 –2 –24 –2.5 μA μA RTS(DIS) TIMER, SS Discharge Resistance VTIMER = 1.2V, VSS = 1.2V ● 225 400 Ω GSS Gain from SS Pin to Foldback Current Limit (ΔVSNS(FB)/ΔVSS) 12VIN, VEEIN 5VIN, 3VIN 46 23 mV/V mV/V The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V12VIN = 12V, V5VIN = 5V, V3VIN = 3.3V, VVEEIN = –12V, unless otherwise noted. ELECTRICAL CHARACTERISTICS |
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