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LTC3899 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3899 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 44 page  LTC7812 4 7812fc For more information www.linear.com/LTC7812 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VBIAS = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Maximum Duty Factor for TG Buck (Channel 1) in Dropout, FREQ = 0V Boost (Channel 2) in Overvoltage 98 99 100 % % Maximum Duty Factor for BG Buck (Channel 1) in Overvoltage Boost (Channel 2) 100 96 % % ITRACK/SS1 Soft-Start Charge Current VTRACK/SS1 = 0V 3 5 8 µA ISS2 Soft-Start Charge Current VSS2 = 0V 3 5 8 µA VRUN1 ON VRUN2 ON RUN1 Pin Threshold RUN2 Pin Threshold VRUN1 Rising VRUN2 Rising l l 1.18 1.21 1.24 1.27 1.32 1.33 V V RUN Pin Hysteresis 70 mV VSENSE1,2,(MAX) Maximum Current Sense Threshold VFB1 = 0.7V, VSENSE1– = 3.3V VFB2 = 1.1V, VSENSE2+ = 12V l 43 50 57 mV Gate Driver TG1 Pull-Up On-Resistance TG1 Pull-Down On-Resistance 2.5 1.5 Ω Ω BG1 Pull-Up On-Resistance BG1 Pull-Down On-Resistance 2.4 1.1 Ω Ω TG2 Pull-Up On-Resistance TG2 Pull-Down On-Resistance 1.2 1.0 Ω Ω BG2 Pull-Up On-Resistance BG2 Pull-Down On-Resistance 1.2 1.0 Ω Ω TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 16 ns ns BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 28 13 ns ns Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver Buck (Channel 1) Boost (Channel 2) 30 70 ns ns Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver Buck (Channel 1) Boost (Channel 2) 30 70 ns ns tON(MIN)1 Buck Minimum On-Time (Note 7) 95 ns tON(MIN)2 Boost Minimum On-Time (Note 7) 120 ns INTVCC Linear Regulator Internal VCC Voltage 6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA 5.0 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 2 % Internal VCC Voltage 6V < VEXTVCC < 13V, IINTVCC = 0mA 5.0 5.4 5.6 V INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 8.5V 0.7 2 % EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V EXTVCC Hysteresis 200 mV Oscillator and Phase-Locked Loop Programmable Frequency RFREQ = 25k; PLLIN/MODE = DC Voltage 115 kHz RFREQ = 65k; PLLIN/MODE = DC Voltage 440 kHz RFREQ = 105k; PLLIN/MODE = DC Voltage 835 kHz Low Fixed Frequency VFREQ = 0V PLLIN/MODE = DC Voltage 320 350 380 kHz |
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