Datasheet LTC3370 (Analog Devices) - 6

LTC3370
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. VCC Undervoltage Threshold vs Buck Efficiency vs ILOAD Buck Power Loss vs ILOAD Temperature
100 3000 2.70 Burst Mode OPERATION 90 VIN = 3.3V 2.65 2500 80 VOUT = 1.8V fOSC = 2MHz 2.60 70 L = 2.2µH 2000 VCC RISING 60 2.55 Burst Mode OPERATION 1A BUCK 50 VIN = 3.3V 1500 2A BUCK 2.50 VOUT = 1.8V 3A BUCK V 40 f CC FALLING OSC = 2MHz 4A BUCK EFFICIENCY (%) 2.45 L = 2.2µH 1000 30 POWER LOSS (mW) UV THRESHOLD (V) 2.40 20 1A BUCK 2A BUCK 500 10 3A BUCK 2.35 4A BUCK 0 0 2.30 1 10 100 1000 1 10 100 1000 –55 –25 5 35 65 95 125 155 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 3370 G01 3370 G02 3370 G03
Buck VIN Undervoltage Threshold VCC Supply Current vs VCC Supply Current vs vs Temperature Temperature Temperature
2.30 125 400 AT LEAST ONE BUCK ENABLED AT LEAST ONE BUCK ENABLED 2.25 PLL/MODE = 0V 360 PLL/MODE = 2MHz FB = 850mV 100 320 2.20 VIN RISING 280 2.15 75 240 2.10 (µA) (µA) 200 VIN FALLING I VCC I VCC 2.05 50 160 UV THRESHOLD (V) 120 2.00 25 V 80 V 1.95 CC = 2.7V CC = 2.7V VCC = 3.3V 40 VCC = 3.3V V V 1.90 CC = 5.5V CC = 5.5V 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) 3370 G04 3370 G05 3370 G06
RT Programmed Oscillator Default Oscillator Frequency vs Frequency vs Temperature Temperature Oscillator Frequency vs VCC
2.20 2.20 2.20 RT = 400k VCC = 2.7V VRT = VCC VCC = 2.7V 2.15 V 2.15 CC = 3.3V 2.15 VCC = 3.3V V V 2.10 CC = 5.5V 2.10 CC = 5.5V 2.10 2.05 2.05 2.05 VRT = VCC (MHz) 2.00 (MHz) 2.00 (MHz) 2.00 RT = 400k f OSC f OSC 1.95 f OSC 1.95 1.95 1.90 1.90 1.90 1.85 1.85 1.85 1.80 1.80 1.80 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 TEMPERATURE (°C) TEMPERATURE (°C) VCC (V) 3371 G07 3370 G08 3370 G09 3370fb 6 For more information www.linear.com/LTC3370 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via PGOODALL Pin Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency 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 Typical Application Related Parts