Datasheet LTC3897-2 (Analog Devices) - 3

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 Supply Voltage and Operating Current
VBIAS Bias Voltage Operating Range 4.5 75 V SENSE Pins Common Mode Range 2.3 65 V (BOOST Converter Input Supply Voltage) VIN Input Supply Voltage Operating Range 4.2 75 V Reverse Input Current VIN = –30V 0 –10 µA IQ Input DC Supply Current (Note 5) Pulse-Skipping or Forced Continuous Mode RUN = 12V, VFB = 1.25V (No Load) 1.32 mA Burst Mode (Sleep) RUN = 12V, DGEN = SGEN = 0V, VFB = 1.25V 55 90 µA (No Load), CS = IS+ = IS– = VSPFB = 0V RUN = DGEN = 12V, SGEN = 0V, VFB = 1.25V 125 190 µA (No Load), CS = 12V, IS+ = IS– = CS – 0.1V RUN = 12V, DGEN = 0V, SGEN = 12V, 260 380 µA VFB = 1.25V (No Load), CS = IS+ = IS– = 12V RUN = DGEN = SGEN = 12V, VFB = 1.25V 325 450 µA (No Load), CS = 12V, IS+ = IS– = CS – 0.1V Shutdown RUN = DGEN = SGEN = 0V 15 22 µA
BOOST Controller Main Control Loop
VOUT Regulated Boost Output Voltage in 60 V Synchronous Configuration VFB Regulated Feedback Voltage ITH = 1.2 V (Note 4) l 1.188 1.200 1.212 V IFB Feedback Current (Note 4) ±10 ±50 nA Reference Line Voltage Regulation (Note 4) VIN = 6V to 75V 0.002 0.02 %/V Output Voltage Load Regulation (Note 4) (Note 4) Measured in Servo Loop, l 0.01 0.1 % ITH Voltage = 1V to 0.6V (Note 4) Measured in Servo Loop, l –0.01 –0.1 % ITH Voltage = 1V to 1.4V gm Error Amplifier Transconductance ITH = 1.2 V 2 mmho UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V l 4.0 4.2 V DRVUV = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVUV = 0V l 3.6 3.8 4.0 V DRVUV = INTVCC l 6.4 6.7 7.0 V VRUN RUN Pin ON Threshold VRUN Rising l 1.18 1.28 1.38 V RUN Pin Hysteresis 100 mV ISS Soft-Start Charge Current VSS = GND 7 10 13 µA VSENSE1,2(MAX) Maximum Current Sense Threshold VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l 125 140 155 mV VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l 85 95 105 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l 41 48 55 mV Matching Between VSENSE1(MAX) and VFB = 1.15V, ILIM = INTVCC, VSENSE+ = 12V l –12 0 12 mV VSENSE2(MAX) VFB = 1.15V, ILIM = Float, VSENSE+ = 12V l –10 0 10 mV VFB = 1.15V, ILIM = GND, VSENSE+ = 12V l –9 0 9 mV Rev. A For more information www.analog.com 3 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