Datasheet LTC3897-2 (Analog Devices) - 4

LTC3897-2
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). VIN = 12V, VBIAS = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SENSE+ Pin Current VFB = 1.1V, ILIM = Float 250 350 µA SENSE– Pin Current VFB = 1.1V, ILIM = Float ±2 µA Top Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Top Gate Pull-Down Resistance DRVCC = 10V 1.5 Ω Bottom Gate Pull-Up Resistance DRVCC = 10V 2.5 Ω Bottom Gate Pull-Down Resistance DRVCC = 10V 1 Ω BDSW BOOST to DRVCC Switch On-Resistance VSW = 0V, VDRVSET = INTVCC 2.6 3.7 Ω Top Gate Off to Bottom Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Bottom Gate Off to Top Gate On Switch-On DTC = 0V 55 75 ns Delay Time DTC = Float 90 130 ns DTC = INTVCC 170 275 ns Maximum BG Duty Factor 96 % tON(MIN) Minimum BG On-Time (Note 7) VDRVSET = INTVCC 90 ns
DRVCC LDO Regulator
DRVCC Voltage from Internal VBIAS LDO VEXTVCC = 0V 7V < VBIAS < 75V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VBIAS < 75V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from VBIAS LDO ICC = 0mA to 50mA, VEXTVCC = 0V, 0.7 2 % VDRVSET = INTVCC DRVCC Voltage from Internal EXTVCC LDO 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from ICC = 0mA to 50mA, VEXTVCC = 8.5V, 0.7 2 % Internal EXTVCC LDO VDRVSET = 0V EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVUV = 0V 4.5 4.7 4.9 V DRVUV = INTVCC 7.4 7.7 8.0 V EXTVCC Hysteresis 250 mV Programmable DRVCC RDRVSET = 50kΩ, VEXTVCC = 0V 5.0 V Programmable DRVCC RDRVSET = 70kΩ, VEXTVCC = 0V 6.4 7.0 7.6 V Programmable DRVCC RDRVSET = 90kΩ, VEXTVCC = 0V 9.0 V
Oscillator and Phase-Locked Loop
Programmable Frequency RFREQ = 25k 105 kHz RFREQ = 60k 335 400 465 kHz Lowest Fixed Frequency VFREQ = 0V 320 350 380 kHz Highest Fixed Frequency VFREQ = INTVCC 488 535 585 kHz fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 75 550 kHz PLLIN/MODE Input High Level PLLIN/MODE = External Clock l 2.5 V PLLIN/MODE Input Low Level PLLIN/MODE = External Clock l 0.5 V Rev. A 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 Typical Applications Typical Application Related Parts