Datasheet LT3509 (Analog Devices) - 5

LT3509
Typical perForMance characTerisTics fSW vs Temperature Max VIN for Constant Frequency FB Pin Voltage vs Temperature (Measured at 1MHz) VOUT = 3.3V, fSW = 2MHz
0.810 1.04 30 TA = 25ºC 1.03 25 TA = 85ºC 0.805 ) 1.02 SW (V) 20 IN 1.01 0.800 15 1.00 NORMALIZED (f MAXIMUM V 10 0.795 0.99 FEEDBACK PIN VOLTAGE (V) 5 0.98 0.790 0.97 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 TEMPERATURE (°C) TEMPERATURE (˚C) ILOAD (A) 3509 G08 3509 G09 3509 G10
Max VIN for Constant Frequency Minimum On-Time vs VOUT = 5V, fSW = 2MHz Temperature, ILOAD = 0.3A
45 160 40 T 140 A = 25ºC 35 T 120 A = 85ºC (V) 30 IN 100 25 80 20 60 MAXIMUM V 15 MINIMUM ON-TIME (ns) 10 40 5 20 0 0 0 0.2 0.4 0.6 0.8 –50 –25 0 25 50 75 100 125 150 ILOAD (A) TEMPERATURE (°C) 3509 G11 3509 G12
ILIM vs Temperature ILIM vs Duty Cycle
1.5 1.8 TA = 25ºC 1.6 1.3 SWITCH 1.4 1.2 1.0 DA (A) (A) 1 I LIM I LIM 0.8 0.9 0.6 0.4 0.7 0.2 0.5 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (°C) DUTY CYCLE (%) 3509 G13 3509 G14 3509fd For more information www.linear.com/LT3509 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Related Parts