Datasheet LTC7800 (Analog Devices) - 7

LTC7800
TYPICAL PERFORMANCE CHARACTERISTICS Foldback Current Limit Quiescent Current vs Temperature INTVCC vs Load Current
80 80 5.50 I V V LIM = FLOAT IN = 12V IN = 12V 70 75 5.25 70 TAGE (mV) 60 EXTVCC = 0V I 65 LIM = INTVCC 5.00 50 EXTVCC = 8.5V 60 40 55 4.75 VOLTAGE (V) 30 50 CC EXTV I 4.50 CC = 5V LIM = GND 45 INTV 20 QUIESCENT CURRENT (µA) 40 4.25 10 35 MAXIMUM CURRENT SENSE VOL 0 30 4.00 0 100 200 300 400 500 600 700 800 –75 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 FEEDBACK VOLTAGE (mV) TEMPERATURE (°C) LOAD CURRENT (mA) 7800 G16 7800 G17 7800 G18
TRACK/SS Pull-Up Current Shutdown (RUN) Threshold Regulated Feedback Voltage vs Temperature vs Temperature vs Temperature
12.0 1.30 808 11.5 806 11.0 1.25 804 10.5 RUN RISING 802 10.0 1.20 800 9.5 798 RUN PIN VOLTAGE (V) RUN FALLING TRACK/SS CURRENT (µA) 9.0 1.15 796 8.5 REGULATED FEEDBACK VOLTAGE (mV) 794 8.0 1.10 792 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 7800 G19 7800 G20 7800 G21
SENSE– Pin Input Bias Current Maximum Duty Factor vs Oscillator Frequency vs Temperature Frequency vs Temperature
800 100.0 2.25 FREQ = 100k 700 99.5 2.05 VOUT > INTVCC + 0.5V 600 99.0 1.85 500 98.5 400 (%) 1.65 98.0 FREQ = INTV 300 MAX CC – CURRENT (µA) DF 1.45 97.5 200 FREQUENCY (MHz) SENSE 1.25 97.0 100 VOUT < INTVCC – 0.5V 0 96.5 1.05 FREQ = GND –100 96.0 0.85 –75 –50 –25 0 25 50 75 100 125 150 300 740 1180 1620 2060 2500 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FREQUENCY (kHz) TEMPERATURE (°C) 7800 G23 7800 G24 7800 G22 7800f For more information www.linear.com/LTC7800 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Typical Application Related Parts