Datasheet LT3581 (Analog Devices) - 5

LT3581
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switch Fault Current Limit vs Switch Saturation Voltage with Current Sharing Between SW1 and Duty Cycle SW1 and SW2 Tied Together SW2 When Tied Together
6 450 100 400 90 5 350 80 4 70 300 TAGE (mV) 60 250 T CURRENT LIMIT (A) 3 50 200 AUL TION VOL 40 2 150 TURA 30 + SW2 F SA 100 1 20 SW1 50 CURRENT SHARING = SW2/SW1 (%) 10 0 0 0 20 30 40 50 60 70 80 0 1 2 3 4 5 0 1 2 3 4 5 DUTY CYCLE (%) SW1 + SW2 CURRENT (A) SW1 + SW2 CURRENT (A) 3581 G01 3581 G02 3581 G03
Switch Fault Current Limit vs Positive Feedback Voltage CLKOUT Duty Cycle Temperature vs Temperature vs Temperature
6 1.2200 80 5 70 1.2175 60 4 50 T CURRENT LIMIT (A) 3 1.2150 40 AUL 2 CLKOUT DC (%) 30 + SW2 F POSITIVE FB VOLTAGE (V) 1.2125 1 20 SW1 0 1.2100 10 –50 –25 0 25 50 75 100 125 150 –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) 3581 G04 3581 G05 3581 G06
Oscillator Frequency Frequency Foldback Gate Current vs Gate Voltage
3200 1000 ) 1 2800 900 R /f OSC T = 34k –40°C SW 800 2400 700 125°C 25°C 2000 600 1600 1/2 500 1200 400 TE CURRENT (µA) FREQUENCY (kHz) 1/3 GA 300 800 1/4 1/5 200 400 1/6 RT = 432k INVERTING BOOSTING 100 SWITCHING FREQUENCY RATIO (f CONFIGURATIONS CONFIGURATIONS 0 0 0 –50 –25 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 1.2 0 20 40 60 80 TEMPERATURE (°C) FB VOLTAGE (V) GATE VOLTAGE (V) 3581 G07 3581 G08 3581 G09 3581fb For more information www.linear.com/LT3581 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram State Diagram Operation Applications Information Appendix Typical Applications Typical Application Related Parts