Datasheet LTC3769 (Analog Devices) - 3

LTC3769
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C, VBIAS = 12V, unless otherwise noted (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VBIAS Chip Bias Voltage Operating Range 4.5 60 V VIN SENSE Pins Common Mode Range (BOOST 2.3 60 V Converter Input Supply Voltage) VOUT Regulated Output Voltage Range VIN 60V V VFB Regulated Feedback Voltage ITH = 1.2V (Note 4) l 1.188 1.200 1.212 V Feedback Current (Note 4) ±5 ±50 nA Reference Line Voltage Regulation VBIAS = 6V to 60V 0.002 0.02 %/V Output Voltage Load Regulation Measured in Servo Loop; l 0.01 0.1 % (Note 4) ΔITH Voltage = 1.2V to 0.7V Measured in Servo Loop; l –0.01 –0.1 % ΔITH Voltage = 1.2V to 2V Error Amplifier Transconductance ITH = 1.2V 2 mmho IQ Input DC Supply Current (VBIAS Pin) (Note 5) Pulse-Skipping or Forced Continuous Mode RUN = 5V; VFB = 1.25V (No Load) 0.9 mA Sleep Mode RUN = 5V; VFB = 1.25V (No Load) 28 45 µA Shutdown RUN = 0V 4 10 µA SW Pin Current VSW = 12V; VBOOST = 16.5V; 700 µA FREQ = 0V, Forced Continuous or Pulse-Skipping Mode UVLO INTVCC Undervoltage Lockout Thresholds VINTVCC Ramping Up l 4.1 4.3 V VINTVCC Ramping Down l 3.6 3.8 V VRUN RUN Pin ON Threshold VRUN Rising l 1.18 1.28 1.38 V RUN Pin Hysteresis 100 mV RUN Pin Hysteresis Current VRUN > 1.28V 4.5 µA RUN Pin Current VRUN < 1.28V 0.5 µA Soft-Start Charge Current VSS = GND 7 10 13 µA VSENSE(MAX) Maximum Current Sense Threshold VFB = 1.1V, ILIM = INTVCC l 90 100 110 mV VFB = 1.1V, ILIM = Float l 68 75 82 mV VFB = 1.1V, ILIM = GND l 42 50 56 mV SENSE+ Pin Current VFB = 1.1V, ILIM = Float 200 300 µA SENSE– Pin Current VFB = 1.1V, ILIM = Float ±1 µA Top Gate Rise Time CLOAD = 3300pF (Note 6) 20 ns Top Gate Fall Time CLOAD = 3300pF (Note 6) 20 ns Bottom Gate Rise Time CLOAD = 3300pF (Note 6) 20 ns Bottom Gate Fall Time CLOAD = 3300pF (Note 6) 20 ns Top Gate Pull-Up Resistance 1.2 Ω Top Gate Pull-Down Resistance 1.2 Ω Bottom Gate Pull-Up Resistance 1.2 Ω Bottom Gate Pull-Down Resistance 1.2 Ω Top Gate Off to Bottom Gate On Switch-On CLOAD = 3300pF (Each Driver) 30 ns Delay Time Bottom Gate Off to Top Gate On Switch-On CLOAD = 3300pF (Each Driver) 30 ns Delay Time Maximum BG Duty Factor 96 % tON(MIN) Minimum BG On-Time (Note 7) 110 ns 3769fa For more information www.linear.com/LTC3769 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts