Datasheet LTC3371 (Analog Devices) - 6

LTC3371
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. VCC Undervoltage Threshold Buck Efficiency vs ILOAD Buck Power Loss vs ILOAD vs Temperature
100 3000 2.70 1A BUCK 90 2A BUCK 2.65 2500 80 3A BUCK 4A BUCK 2.60 70 2000 60 2.55 50 1500 2.50 40 EFFICIENCY (%) 2.45 1000 30 Burst Mode OPERATION POWER LOSS (mW) Burst Mode OPERATION UV THRESHOLD (V) V 1A BUCK V 2.40 20 IN = 3.3V IN = 3.3V VOUT = 1.8V 2A BUCK 500 VOUT = 1.8V V 10 f CC RISING OSC = 2MHz 3A BUCK fOSC = 2MHz 2.35 L = 2.2µH 4A BUCK L = 2.2µH VCC FALLING 0 0 2.30 1 10 100 1000 4000 1 10 100 1000 4000 –55 –25 5 35 65 95 125 155 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 3371 G03 3371 G01 3371 G02
Buck VIN Undervoltage Threshold VCC Supply Current VCC Supply Current vs Temperature vs Temperature vs Temperature
2.30 40 125 ALL REGULATORS AT LEAST ONE BUCK ENABLED 2.25 35 IN SHUTDOWN PLL/MODE = 0V FB = 850mV 100 2.20 30 2.15 25 (µA) 75 2.10 20 (µA) I VCC 2.05 15 50 I VCC_ALLOFF UV THRESHOLD (V) 2.00 10 VCC = 2.7V 25 VCC = 2.7V 1.95 VIN RISING 5 VCC = 3.3V VCC = 3.3V VIN FALLING VCC = 5.5V VCC = 5.5V 1.90 0 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3371 G04 3371 G05 3371 G06
VCC Supply Current RT Programmed Oscillator Default Oscillator Frequency vs Temperature Frequency vs Temperature vs Temperature
400 2.20 2.20 AT LEAST ONE BUCK ENABLED R V 360 T = 400k RT = VCC PLL/MODE = 2MHz 2.15 2.15 320 2.10 2.10 280 240 2.05 2.05 (µA) 200 (MHz) 2.00 (MHz) 2.00 I VCC 160 f OSC 1.95 f OSC 1.95 120 1.90 1.90 80 VCC = 2.7V VCC = 2.7V VCC = 2.7V V V V 40 CC = 3.3V 1.85 CC = 3.3V 1.85 CC = 3.3V VCC = 5.5V VCC = 5.5V VCC = 5.5V 0 1.80 1.80 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3371 G07 3371 G08 3371 G09 3371fb 6 For more information www.linear.com/LTC3371 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 RST Pins Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Windowed Watchdog Timer Choosing the CT Capacitor Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Power Stages Input and Output Decoupling Capacitor Selection PCB Considerations Typical Applications Package Description Revision History Typical Application Related Parts