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LTC3891 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3891 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 40 page  LTC3858-2 3 38582f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ΔITH Voltage = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ΔITH Voltage = 1.2V to 2V l –0.01 –0.1 % gm1,2 Transconductance Amplifier gm (Note 4) ITH1,2 = 1.2V, Sink/Source = 5μA 2 mmho IQ Input DC Supply Current (Note 5) Pulse-Skipping or Forced Continuous Mode (One Channel On) RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V (No Load) or RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V (No Load) 1.3 mA Pulse-Skipping 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, VFB1 = 0.83V (No Load) or RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V (No Load) 170 250 μA Sleep Mode (Both Channels On) RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 300 450 μA Shutdown RUN1,2 = 0V 8 20 μA UVLO Undervoltage Lockout INTVCC Ramping Up INTVCC Ramping Down l l 3.6 4.0 3.8 4.2 4 V V VOVL Feedback Overvoltage Protection Measured at VFB1,2, Relative to Regulated VFB1,2 710 13 % ISENSE+ SENSE+ Pins Current Each Channel ±1 μA ISENSE– SENSE– Pins Current Each Channel VOUT1,2 < INTVCC – 0.5V VOUT1,2 > INTVCC + 0.5V 550 ±1 μA μA DFMAX Maximum Duty Factor In Dropout, FREQ = 0V 98 99 % ISS1,2 Soft-Start Charge Current VSS1,2 = 0V 0.7 1.0 1.4 μA VRUN1,2 On RUN Pin On Threshold Voltage VRUN1, VRUN2 Rising l 1.21 1.26 1.31 V VRUN1,2 Hyst RUN Pin Hysteresis Voltage 50 mV VSENSE(MAX) Maximum Current Sense Threshold Voltage VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0 VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = FLOAT VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = INTVCC l l l 22 43 64 30 50 75 36 57 86 mV mV 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 16 ns ns BG1,2 tr BG1,2 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 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 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. |
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