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LTC3890EGN-1PBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3890EGN-1PBF Datasheet(HTML) 3 Page - Linear Technology |
3 / 36 page LTC3890-1 3 38901f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V, Sink/Source = 5μA (Note 4) 2 mmho IQ Input DC Supply Current (Note 5) Pulse Skip or Forced Continuous Mode (One Channel On) RUN1 = 5V and RUN2 = 0V or RUN1 = 0V and RUN2 = 5V, VFB1 = 0.83V (No Load) 2mA Pulse Skip or Forced Continuous Mode (Both Channels On) RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 2 mA Sleep Mode (One Channel On) RUN1 = 5V and RUN2 = 0V or RUN1 = 0V and RUN2 = 5V, VFB1 = 0.83V (No Load) 50 75 μA Sleep Mode (Both Channels On) RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 60 100 μA Shutdown RUN1,2 = 0V 14 25 μA UVLO Undervoltage Lockout INTVCC Ramping Up INTVCC Ramping Down l l 3.6 4.0 3.8 4.2 4.0 V V VOVL Feedback Overvoltage Protection Measured at VFB1,2, Relative to Regulated VFB1,2 710 13 % ISENSE+ SENSE+ Pin Current Each Channel ±1 μA ISENSE– SENSE– Pins Current Each Channel VSENSE– < INTVCC – 0.5V VSENSE– > INTVCC + 0.5V 700 ±1 μA μA DFMAX Maximum Duty Factor In Dropout 98 99 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK1,2 = 0V 0.7 1.0 1.4 μA VRUN1 On VRUN2 On RUN1 Pin On Threshold RUN2 Pin On Threshold VRUN1 Rising VRUN2 Rising l l 1.15 1.20 1.21 1.25 1.27 1.30 V V VRUN1,2 Hyst RUN Pin Hysteresis 50 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0 l 64 75 85 mV 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 TG1,2 tr TG1,2 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns BG1,2 tr BG1,2 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns BG/TG t1D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns tON(MIN) Minimum On-Time (Note 7) 95 ns INTVCC Linear Regulator VINTVCCVIN Internal VCC Voltage 6V < VIN < 60V, VEXTVCC = 0V 4.85 5.1 5.35 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 1.1 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V 4.85 5.1 5.35 V |
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