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LTC3859AL Datasheet(PDF) 5 Page - Linear Technology |
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LTC3859AL Datasheet(HTML) 5 Page - Linear Technology |
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5 / 38 page  LTC3899 5 3899fa For more information www.linear.com/LTC3899 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VBIAS = 12V, VRUN1,2,3 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG3 = Float unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS BDSW1,2,3 BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 3.7 Ω TG1,2,3 tr TG1,2,3 tf TG Transition Time: Rise Time Fall Time (Note 6) VDRVSET = INTVCC CLOAD = 3300pF CLOAD = 3300pF 25 15 ns ns BG1,2,3 tr BG1,2,3 tf BG Transition Time: Rise Time Fall Time (Note 6) VDRVSET = INTVCC CLOAD = 3300pF CLOAD = 3300pF 25 15 ns ns TG1,2/BG1,2 t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 55 ns BG1,2/TG1,2 t1D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 50 ns TG3/BG3 t1D CH3 Top Gate Off to Bottom Gate On Delay Bottom Switch-On Delay Time CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 85 ns BG3/TG3 t1D CH3 Bottom Gate Off to Top Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 80 ns tON(MIN)1,2 Buck Minimum On-Time (Note 7) VDRVSET = INTVCC 80 ns tON(MIN)3 Boost Minimum On-Time (Note 7) VDRVSET = INTVCC 120 ns DRVCC Linear Regulator VDRVCC(INT) DRVCC Voltage from Internal VBIAS LDO VEXTVCC = 0V 7V < VBIAS < 60V, DRVSET = 0V 11V < VBIAS < 60V, DRVSET = INTVCC 5.8 9.6 6.0 10.0 6.2 10.4 V V VLDOREG(INT) DRVCC Load Regulation from VBIAS LDO ICC = 0mA to 50mA, VEXTVCC = 0V 0.9 2.0 % VDRVCC(EXT) DRVCC Voltage from Internal EXTVCC LDO 7V < VEXTVCC < 13V, DRVSET = 0V 11V < VEXTVCC < 13V, DRVSET = INTVCC 5.8 9.6 6.0 10.0 6.2 10.4 V V VLDOREG(EXT) DRVCC Load Regulation from Internal EXTVCC LDO ICC = 0mA to 50mA, VEXTVCC = 8.5V, VDRVSET = 0V 0.7 2.0 % VEXTVCC EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVSET = 0V or RDRVSET ≤ 100kΩ DRVSET = INTVCC 4.5 7.4 4.7 7.7 4.9 8.0 V V VLDOHYS EXTVCC Hysteresis 250 mV VDRVCC(50kΩ) Programmable DRVCC RDRVSET = 50kΩ, VEXTVCC = 0V 5.0 V VDRVCC(70kΩ) Programmable DRVCC RDRVSET = 70kΩ, VEXTVCC = 0V 6.4 7.0 7.6 V VDRVCC(90kΩ) Programmable DRVCC RDRVSET = 90kΩ, VEXTVCC = 0V 9.0 V Oscillator and Phase-Locked Loop f25kΩ Programmable Frequency RFREQ =25kΩ, PLLIN/MODE = DC Voltage 105 kHz f65kΩ Programmable Frequency RFREQ = 65kΩ, PLLIN/MODE = DC Voltage 375 440 505 kHz f105kΩ Programmable Frequency RFREQ = 105kΩ, PLLIN/MODE = DC Voltage 835 kHz fLOW Low Fixed Frequency VFREQ = 0V, PLLIN/MODE = DC Voltage 320 350 380 kHz fHIGH High Fixed Frequency VFREQ = INTVCC, PLLIN/MODE = DC Voltage 485 535 585 kHz fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 850 kHz PLLIN VIH PLLIN VIL PLLIN/MODE Input High Level PLLIN/MODE Input Low Level PLLIN/MODE = External Clock PLLIN/MODE = External Clock l l 2.5 0.5 V V BOOST3 Charge Pump IBST3 BOOST3 Charge Pump Available Output Current FREQ = 0V, PLLIN/MODE = INTVCC VBOOST3 = 16.5V, VSW3 = 12V VBOOST3 = 19V, VSW3 = 12V 75 35 µA µA |
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