Datasheet LTC3374A (Analog Devices) - 6

LTC3374A
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. EN Pin Rising Threshold vs Oscillator Frequency vs RT VTEMP vs Temperature Temperature
4.0 1200 900 V FIRST BUCK TURNING ON CC = 3.3V 3.5 1000 850 3.0 800 800 2.5 750 600 (mV) (MHz) 2.0 700 f OSC 400 1.5 V TEMP ACTUAL V 650 TEMP 200 EN THRESHOLD (mV) 1.0 600 0.5 0 550 IDEAL VTEMP 0 –200 500 250 300 350 400 450 500 550 600 650 700 750 800 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 R TEMPERATURE (°C) TEMPERATURE (°C) T (kΩ) 3374A G10 3374A G11 3374A G09
EN Pin Rising Threshold vs EN Pin Falling Threshold vs Buck VIN Quiescent Current Temperature Temperature vs Temperature
420 340 50 ONE BUCK ALREADY ENABLED BURST MODE OPERATION 415 335 FB = 850mV 40 410 330 405 325 30 400 320 (µA) I VIN 395 315 20 EN THRESHOLD (mV) EN THRESHOLD (mV) 390 310 10 V 385 305 IN = 2.25V VIN = 3.3V V 380 IN = 5.5V 300 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) 3374A G12 3374A G13 3374A G14
Buck VIN Quiescent Current PMOS Current Limit vs Temperature VFB vs Temperature vs Temperature
550 808 2.2 FORCED CONTINUOUS MODE VIN = 3.3V 500 FB = 0V 806 2.1 450 804 2.0 400 350 802 1.9 300 (µA) (A) (mV) 800 1.8 250 I VIN I LIM V FB 200 798 1.7 150 796 1.6 100 VIN = 2.25V VIN = 2.25V V 794 1.5 50 IN = 3.3V VIN = 3.3V VIN = 5.5V V 0 IN = 5.5V 792 1.4 –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) 3374A G15 3374A G16 3374A G17 3374af 6 For more information www.linear.com/LTC3374A Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information (http://www.linear.com/product/LTC3374A#orderinfo) 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 Input and Output Decoupling Capacitor Selection Combined Buck Regulators Buck Regulators PCB Considerations Package Description Typical Application Related Parts