Datasheet LT3579, LT3579-1 (Analog Devices) - 5

LT3579/LT3579-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switch Current Limit Switch Saturation Voltage Switch Current Sharing
10 350 1.0 9 0.9 300 8 VSW1 = VSW2 0.8 7 250 0.7 6 TAGE (mV) 200 (A/A) 0.6 5 0.5 /I SW1 4 150 TION VOL 0.4 I SW2 3 100 0.3 SW1 + SW2 CURRENT (A) TURA 2 SA 0.2 50 1 0.1 0 0 0.0 20 30 40 50 60 70 80 0 1 2 3 4 5 6 7 8 0 0.5 1 1.5 2 2.5 3 3.5 4 DUTY CYCLE (%) SW1 + SW2 CURRENT (A) SW1 CURRENT (A) 35791 G01 35791 G02 35791 G03
Switch Current Limit vs Temperature Commanded Switch Current vs SS Positive Feedback Voltage
10 10 1.23 9 9 8 1.225 8 7 7 1.22 6 6 5 5 TAGE (V) 1.215 4 4 FB VOL 3 1.21 3 SW1 + SW2 CURRENT (A) SW1 + SW2 CURRENT (A) 2 2 1.205 1 1 0 0 1.2 –50 –25 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1 1.2 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) SS VOLTAGE (V) TEMPERATURE (°C) 35791 G04 35791 G05 35791 G06
Oscillator Frequency During Oscillator Frequency
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Soft-Start CLKOUT Duty Cycle
3.0 NOM 1 80 2.8 /F 2.6 SW 70 2.4 RT = 34k 2.2 60 2.0 1.8 50 1.6 1/2 Y CYCLE (%) 1.4 TOR FREQUENCY (F 1.2 40 1.0 FREQUENCY (MHz) 1/3 0.8 1/4 30 CLKOUT DUT 0.6 1/5 0.4 R 1/6 T = 432k INVERTING BOOSTING 20 0.2 CONFIGURATIONS CONFIGURATIONS 0.0 0 0 –50 –25 0 25 50 75 100 125 150 NORMALIZED OSCILLA 0 0.2 0.4 0.6 0.8 1 1.2 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FB VOLTAGE (V) TEMPERATURE (°C) 35791 G07 35791 G08 35791 G09 Rev. B For more information www.analog.com 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 Application Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram State Diagram Operation Applications Information Appendix Typical Application Package Description Revision History Typical Application Related Parts