Datasheet LTC3871, LTC3871-1 (Analog Devices) - 4

LTC3871/LTC3871-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C, VHIGH = 50V, VRUN = 5V unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSENSE(MAX) Maximum Current Sense Threshold 0°C to 150°C (DCR Sensing) (Buck and Boost Mode) VILIM = 0V l 8 10 14.5 mV VILIM = 1/4 VV5 l 17 20 24 mV VILIM = Float l 26.5 30 33.5 mV VILIM = 3/4 VV5 l 36 40 44.5 mV VILIM = VV5 (LTC3871) l 44.5 50 55.5 mV VILIM = VV5 (LTC3871-1) l 44.5 50 58.5 mV VSENSE(MAX) Maximum Current Sense Threshold 0°C to 150°C (RSENSE (Buck and Boost Mode) VILIM = 0V l 10 12.5 18.2 mV Sensing) VILIM = 1/4 VV5 l 21.3 25 30 mV VILIM = Float l 33.2 37.5 41.9 mV VILIM = 3/4 VV5 l 45 50 55.6 mV VILIM = VV5 (LTC3871) l 55.6 62.5 69.4 mV VILIM = VV5 (LTC3871-1) l 55.6 62.5 73.1 mV VSENSE(MAX) Maximum Current Sense Threshold –40°C to 150°C (DCR Sensing) (Buck and Boost Mode) VILIM = 0V l 7 10 14.5 mV VILIM = 1/4 VV5 l 16 20 24 mV VILIM = Float l 26 30 33.5 mV VILIM = 3/4 VV5 l 35 40 44.5 mV VILIM = VV5 (LTC3871) l 42 50 55.5 mV VILIM = VV5 (LTC3871-1) l 42 50 58.5 mV VSENSE(MAX) Maximum Current Sense Threshold –40°C to 150°C (RSENSE (Buck and Boost Mode) VILIM = 0V l 8.8 12.5 18.2 mV Sensing) VILIM = 1/4 VV5 l 20 25 30 mV VILIM = Float l 32.5 37.5 41.9 mV VILIM = 3/4 VV5 l 43.8 50 55.6 mV VILIM = VV5 (LTC3871) l 52.5 62.5 69.4 mV VILIM = VV5 (LTC3871-1) l 52.5 62.5 73.1 mV TG tr Top Gate Rise Time (Note 6) 60 ns TG tf Top Gate Fall Time BG tr Bottom Gate Rise Time (Note 6) 60 ns BG tf Bottom Gate Fall Time Top Gate Off to Bottom Gate On Delay (Note 6) CLOAD = 3300pF Each Driver 60 ns Synchronous Switch-On Delay Time Bottom Gate Off to Top Gate On Delay (Note 6) CLOAD = 3300pF Each Driver 60 ns Top Switch-On Delay Time V5 Regulation Voltage 6V < VDRVCC < 10V 5.3 5.5 5.7 V V5 Load Regulation IV5 = 0mA to 20mA 0.5 1 % VDRVCC DRVCC Regulation Voltage 12V < VEXTVCC < 30V, VDRVSET = VV5 9.5 10 10.5 V 12V < VEXTVCC < 30V, VDRVSET = 3/4 VV5 8.5 9 9.5 V 12V < VEXTVCC < 30V, VDRVSET = Float 7.5 8 8.5 V 12V < VEXTVCC < 30V, VDRVSET = 1/4 VV5 6.5 7 7.5 V 12V < VEXTVCC < 30V, VDRVSET = 0V 5.5 6 6.5 V DRVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 10V 0.2 1 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive DRVCC –0.5V V EXTVCC Hysteresis 10 % CLKOUT Phasing Phase Relative to Channel 1 VPHSMD = 0V 60 Deg VPHSMD = 1/4 VV5 60 Deg VPHSMD = Float 90 Deg VPHSMD = 3/4 VV5 45 Deg VPHSMD = VV5 240 Deg Rev. B 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts