Datasheet LT3689, LT3689-5 (Analog Devices) - 6

LT3689/LT3689-5
TYPICAL PERFORMANCE CHARACTERISTICS BST Pin Current Feedback Voltage Output Voltage
25 0.810 5.05 TA = 125°C 5.04 20 5.03 0.805 5.02 TA = –50°C 15 TAGE (V) TAGE (V) 5.01 TA = 25°C 0.800 5.00 10 4.99 4.98 BST PIN CURRENT (mA) FEEDBACK VOL OUTPUT VOL 0.795 5 4.97 4.96 0 0.790 4.95 0 200 400 600 800 1000 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3689 G14 3689 G15 3689 G13
Switching Frequency vs RT Switching Frequency Frequency Foldback
50 900 1200 TA = 25°C RT = 20.5k TA = 25°C 850 RT = 12.7k 40 1000 800 800 30 750 (k) 700 600 R T 20 650 FREQUENCY (kHz) 400 600 10 SWITCHING FREQUENCY (kHz) 200 550 0 500 0 0 0.4 0.8 1.2 1.6 2 2.4 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 FREQUENCY (MHz) TEMPERATURE (°C) FB VOLTAGE (mV) 3689 G16 3689 G17 3689 G18
Minimum Switch On-Time Overvoltage Lockout VIN Fixed Undervoltage Lockout
140 40 3.6 ILOAD = 700mA 120 3.5 39 100 VIN RISING 80 3.4 38 VIN FALLING 60 TAGE LOCKOUT (V) UVLO (V) V IN 3.3 VOL MINIMUM ON-TIME (ns) 40 37 OVER 3.2 20 0 36 3.1 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3689 G20 3689 G21 3689 G19 3689fe 6 For more information www.linear.com/LT3689 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts