Datasheet LTC3374 (Analog Devices) - 7

LTC3374
TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Frequency vs RT VTEMP vs Temperature Enable Threshold vs Temperature
4.0 1400 900 VCC = 3.3V ALL REGULATORS DISABLED 850 3.5 1200 VCC = 3.3V 800 3.0 1000 750 2.5 800 EN RISING 700 (MHz) (mV) 2.0 600 650 EN FALLING f OSC 1.5 V TEMP 400 ACTUAL V 600 TEMP EN THRESHOLD (mV) 550 1.0 200 500 0.5 0 IDEAL V 450 TEMP 0 –200 400 250 300 350 400 450 500 550 600 650 700 750 800 0 20 40 60 80 100 120 140 –50 –25 0 25 50 75 100 125 150 RRT (kΩ) TEMPERATURE (°C) TEMPERATURE (°C) 3374 G09 3374 G10 3374 G11
Enable Pin Precision Threshold Buck VIN Supply Current Buck VIN Supply Current vs Temperature vs Temperature vs Temperature
420 50 550 Burst Mode OPERATION FORCED CONTINUOUS MODE 500 415 FB = 850mV FB = 0V 40 450 VIN = 5.5V 410 (µA) 400 VIN = 3.3V 405 350 (µA) 30 VIN = 2.25V EN RISING 300 400 VIN = 5.5V EN FALLING 250 395 20 I VIN_BURST 200 V EN THRESHOLD (mV) IN = 2.25V 390 V 150 IN = 3.3V 10 I VIN_FORCED_CONTINUOUS 100 385 50 380 0 0 –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) 3374 G12 3374 G13 3374 G14
PMOS Current Limit VOUT vs Temperature vs Temperature
1.88 FORCED CONTINUOUS MODE 2.6 V I IN = 3.3V 1.86 LOAD = 0mA 2.5 1.84 2.4 1.82 VIN = 5.5V (V) (A) 1.80 2.3 V OUT VIN = 2.25V I FWD 1.78 VIN = 3.3V 2.2 1.76 2.1 1.74 1.72 2.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) 3374 G15 3374 G16 3374fc For more information www.linear.com/LTC3374 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via PGOOD_ALL Pin Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Regulators Input and Output Decoupling Capacitor Selection PCB Considerations Package Description Revision History Typical Application Related Parts