Datasheet LTC3897 (Analog Devices) - 5

LTC3897
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
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 RFREQ = 100k 760 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 75 850 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
BOOST1 and BOOST2 Charge Pump
BOOST Charge Pump Available Output FREQ = 0V, Forced Continuous or Current Pulse-Skipping Mode VSW1,2 = 12V; VBOOST1,2 = 16.5V 70 µA VSW1,2 = 12V; VBOOST1,2 = 19.5V 30 µA
Surge Stopper
SGEN Pin ON Threshold VSGEN Rising l 1.16 1.26 1.36 V SGEN Pin Hysteresis 100 mV SG Pin Output High Voltage (VSG – VCS) VIN = 4.2V, ISG = 0, –1µA, DG – CS = 1V l 4.5 8 V VIN = 8V to 70V, ISG = 0, −1µA l 10 12 16 V SG Pin Pull-Up Current VIN = SG = DG = CS = 12V l –5 –10 –15 µA SG Pin Pull-Down Current Overvoltage: SPFB = 1.5V, SG – CS = 5V l 50 130 mA Overcurrent: ΔVIS = 100mV, SG – CS = 5V l 50 130 mA Shutdown: DGEN = SGEN = 0V, SG – CS = 5V l 0.4 1 mA CS Pin Input Current VIN = CS = 12V, IS+ = IS– = 11.9V, SGEN = Float l 2 6 µA VIN = CS = 12V, SGEN = 0V l 25 100 µA VCS = –30V l –2.5 –3.5 mA VSPFB Regulated Surge Protection Feedback Voltage l 1.205 1.235 1.265 V ΔVIS Overcurrent Fault Threshold, (VIS+ – VIS–) IS– > 2.5V l 45 50 55 mV IS– = 1.5V l 21 27 33 mV IS+ Pin Input Current IS+ = IS– = VIN = CS = 12V, SGEN = DGEN = Float l 35 100 µA IS+ = IS– = VIN = CS = 12V, SGEN = DGEN = 0V l 1 15 µA SPFB Pin Input Current SPFB = 1.235V l ±20 ±500 nA IS– Pin Input Current IS+ = IS– = VIN = CS = 12V, SGEN = DGEN = Float l 20 100 µA IS+ = IS– = VIN = CS = 12V, SGEN = DGEN = 0V l 5 15 µA Rev. A For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts