Datasheet LT3959 (Analog Devices) - 5

LT3959
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 2.4 IQ (DRIVE) 2.0 1.61 –0.79 1.6 VIN = 12V 1.60 –0.80 DRIVE = 6V (mA) 1.2 I Q 0.8 1.59 –0.81 FBX REGULATION VOLTAGE (V) FBX REGULATION VOLTAGE (V) 0.4 IQ (VIN) 1.58 –0.82 0.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3959 G01 3959 G02 3959 G03
Dynamic Quiescent Current Normalized Switching Frequency vs Switching Frequency RT vs Switching Frequency vs FBX Voltage
25 100 120 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) 3959 G04 3959 G05 3959 G06
Switching Frequency vs Temperature SW Current Limit vs Temperature SW Current Limit vs Duty Cycle
350 7.6 8.0 7.4 7.5 325 7.2 7.0 300 7.0 6.5 6.8 6.0 275 SW CURRENT LIMIT (A) SW CURRENT LIMIT (A) SWITCHING FREQUENCY (kHz) 6.6 5.5 250 6.4 5.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE (%) 3959 G07 3959 G08 3959 G09 3959fa For more information www.linear.com/LT3959 5 Document Outline Features Description Applications 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