Datasheet LT3759 (Analog Devices) - 5

LT3759
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. FBX Positive Regulation Voltage FBX Negative Regulation Voltage Quiescent Current vs Temperature vs Temperature vs Temperature
1.62 –0.78 2.2 2.0 IQ (DRIVE) 1.8 1.61 –0.79 1.6 1.4 V 1.2 IN = 12V 1.60 –0.80 DRIVE = 6V (mA) I Q 1.0 0.8 1.59 –0.81 0.6 FBX REGULATION VOLTAGE (V) FBX REGULATION VOLTAGE (V) 0.4 IQ (VIN) 0.2 1.58 –0.82 0 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3759 G01 3759 G02 3759 G03
Dynamic Quiescent Current Normalized Switching Frequency vs Switching Frequency RT vs Switching Frequency vs FBX Voltage
25 100 120 CL = 3300pF, DRIVE = 6V 90 20 80 100 70 80 15 60 (mA) I (k) Q (DRIVE) 50 60 I Q R T 10 40 40 30 5 20 NORMALIZED FREQUENCY (%) 20 10 IQ (VIN) 0 0 0 0 200 400 600 800 1000 0 100 200 300 400 500 600 700 800 900 1000 –0.8 –0.4 0 0.4 0.8 1.2 1.6 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) FBX VOLTAGE (V) 3759 G04 3759 G05 3759 G06
Switching Frequency SENSE Current Limit Threshold SENSE Current Limit Threshold vs Temperature vs Temperature vs Duty Cycle
350 53 53 RT = 27.4k 52 52 325 51 51 300 50 50 49 49 275 SENSE THRESHOLD (mV) SENSE THRESHOLD (mV) SWITCHING FREQUENCY (kHz) 48 48 250 47 47 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE (%) 3759 G07 3759 G08 3759 G09 3759fc For more information www.linear.com/3759 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts