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LTC3859EUHF-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3859EUHF-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
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4 / 40 page  LTC3859 4 3859f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ ≈ TA = 25°C. VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS UVLO Undervoltage Lockout INTVCC Ramping Up l 4.15 4.5 V INTVCC Ramping Down l 3.5 3.8 4.0 V VOVL1,2 Buck Feedback Overvoltage Protection Measured at VFB1,2 Relative to Regulated VFB1,2 710 13 % ISENSE1,2+ SENSE+ Pin Current Bucks (Channels 1 and 2) ±1 μA ISENSE3+ SENSE+ Pin Current Boost (Channel 3) 170 μA ISENSE1,2– SENSE– Pin Current Bucks (Channels 1 and 2) VOUT1,2 < VINTVCC – 0.5V VOUT1,2 > VINTVCC + 0.5V 700 ±2 μA μA ISENSE3– SENSE– Pin Current Boost (Channel 3) VSENSE3+, VSENSE3– = 12V ±1 μA DFMAX,TG Maximum Duty Factor for TG Bucks (Channels 1,2) in Dropout, FREQ = 0V Boost (Channel 3) in Overvoltage 98 99 100 % % DFMAX,BG Maximum Duty Factor for BG Bucks (Channels 1,2) in Overvoltage Boost (Channel 3) 100 96 % % ITRACK/SS1,2 Soft-Start Charge Current VTRACK/SS1,2 = 0V 0.7 1.0 1.4 μA ISS3 Soft-Start Charge Current VSS3 = 0V 0.7 1.0 1.4 μA VRUN1 ON VRUN2,3 ON RUN1 Pin Threshold RUN2,3 Pin Threshold VRUN1 Rising VRUN2,3 Rising l l 1.19 1.23 1.25 1.28 1.31 1.33 V V VRUN1,2,3 Hyst RUN Pin Hysteresis 80 mV VSENSE1,2,3(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1,2– = 3.3V VFB1,2,3 = 1.1V, VSENSE3+ = 12V l 43 50 57 mV VSENSE3(CM) SENSE3 Pins Common Mode Range (BOOST Converter Input Supply Voltage) 2.5 38 V Gate Driver TG1,2 Pull-Up On-Resistance Pull-Down On-Resistance 2.5 1.5 Ω Ω BG1,2 Pull-Up On-Resistance Pull-Down On-Resistance 2.4 1.1 Ω Ω TG3 Pull-Up On-Resistance Pull-Down On-Resistance 1.2 1.0 Ω Ω BG3 Pull-Up On-Resistance Pull-Down On-Resistance 1.2 1.0 Ω Ω TG1,2,3 tr TG1,2,3 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 16 ns ns BG1,2,3 tr BG1,2,3 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 28 13 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) Boost (Channel 3) 30 70 ns ns BG/TG t1D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) Boost (Channel 3) 30 70 ns ns tON(MIN)1,2 Buck Minimum On-Time (Note 7) 95 ns tON(MIN)3 Boost Minimum On-Time (Note 7) 120 ns INTVCC Linear Regulator VINTVCCVBIAS Internal VCC Voltage 6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOVBIAS INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 2 % |
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Similar Description - LTC3859EUHF-TRPBF |
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