Datasheet LT3757, LT3757A (Analog Devices) - 5

LT3757/LT3757A
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Dynamic Quiescent Current Normalized Switching Frequency vs Switching Frequency RT vs Switching Frequency vs FBX
35 1000 120 CL = 3300pF 30 100 25 80 20 (mA) (kΩ) 100 60 I Q 15 R T 40 10 NORMALIZED FREQUENCY (%) 20 5 0 10 0 0 100 200 300 400 500 600 700 800 900 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) 3757 G04 3757 G05 3757 G06
Switching Frequency SENSE Current Limit Threshold SENSE Current Limit Threshold vs Temperature vs Temperature vs Duty Cycle
330 120 115 RT = 41.2K 320 115 110 310 300 110 105 290 SENSE THRESHOLD (mV) 105 SENSE THRESHOLD (mV) 100 SWITCHING FREQUENCY (kHz) 280 270 100 95 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE (%) 3757 G07 3757 G08 3757 G09
SHDN/UVLO Threshold SHDN/UVLO Hysteresis Current vs Temperature SHDN/UVLO Current vs Voltage vs Temperature
1.28 40 2.4 1.26 30 2.2 1.24 SHDN/UVLO RISING (µA) 20 2.0 /UVLO 1.22 /UVLO VOLTAGE (V) /UVLO CURRENT (µA) I SHDN SHDN/UVLO FALLING SHDN SHDN 10 1.8 1.20 1.18 0 1.6 –75 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) SHDN/UVLO VOLTAGE (V) TEMPERATURE (°C) 3757 G10 3757 G12 3757 G11 Rev. F For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts