Datasheet LTC3863 (Analog Devices) - 7

LTC3863
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Free Running Frequency Over Free Running Frequency Over Frequency Foldback % Over Input Voltage Temperature Feedback Voltage
600 600 120 550 FREQ = OPEN 550 FREQ = OPEN 100 500 500 80 450 450 60 f (kHz) f (kHz) 400 400 40 FREQ = 0V FREQ = 0V FREQUENCY FOLDBACK (%) 350 350 20 300 300 0 0 10 20 30 40 50 60 –75 –25 25 75 125 175 0 200 400 600 800 VIN (V) TEMPERATURE (°C) VFB (mV) 3863 G19 3864 G20 3863 G21
GATE Bias LDO (VIN - VCAP) Load GATE Bias LDO (VIN - VCAP) Current Sense Voltage Over ITH Regulation Dropout Behavior Voltage
0.5 0.1 100 VIN = 5V Burst Mode OPERATION 90 0.0 PULSE-SKIPPING 0.0 80 –0.5 70 –0.1 –1.0 60 50 –1.5 ) DROPOUT (V) –0.2 ) REGULATION (%) 40 CAP CAP –2.0 30 - V –0.3 - V IN 20 IN –2.5 (V (V –0.4 CURRENT SENSE VOLTAGE (mV) 10 –3.0 0 –3.5 –0.5 –10 0 5 10 15 20 0 5 10 15 20 0 0.4 0.8 1.2 1.6 2 IGATE (mA) IGATE (mA) ITH VOLTAGE (V) 3863 G22 3863 G23 3863 G24
Current Sense Voltage Over SS Pin Pull-Up Current Over RUN Pin Pull-Up Current Over Temperature Temperature Temperature
100 14 0.65 V V SS = 0V RUN = 0V 98 12 0.55 96 10 0.45 94 8 0.35 92 SS PULL-UP CURRENT (µA) RUN PULL-UP CURRENT (µA) CURRENT LIMIT SENSE VOLTAGE (mV) 90 6 0.25 –75 –25 25 75 125 175 –75 –25 25 75 125 175 –75 –25 25 75 125 175 TEMPERATURE (°C) TEMPERATURE TEMPERATURE (°C) (°C) 3863 G25 3863 G26 3863 G27 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts