Datasheet LTC7812 (Analog Devices) - 8

LTC7812
TYPICAL PERFORMANCE CHARACTERISTICS Buck Inductor Current at Light Boost Inductor Current at Light Load Load Start-Up
FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE V 2V/DIV OUT Burst Mode OPERATION Burst Mode OPERATION I RUN PINS L1 IL2 2A/DIV 5A/DIV 2V/DIV PULSE-SKIPPING MODE PULSE-SKIPPING MODE 5µs/DIV 7812 G19 5µs/DIV 7812 G20 5µs/DIV 7812 G21 FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT VIN = 18V VIN = 8V VIN = 8V VOUT = 12V VOUT = 12V VOUT = 12V IOUT = 1mA IOUT = 1mA IOUT = 0mA
INTVCC and EXTVCC EXTVCC Switchover and INTVCC INTVCC Line Regulation vs Load Current Voltages vs Temperature
5.5 5.6 6.0 5.4 EXTVCC = 0V 5.8 5.4 EXTVCC = 8.5V 5.6 5.2 INTVCC TAGE (V) 5.4 5.3 5.0 VOL 5.2 TAGE (V) TAGE (V) 4.8 V CC 5.0 VOL VOL EXTVCC = 5V EXTV V CC 5.2 V CC 4.6 4.8 CC RISING INT INT AND INT 4.6 4.4 V CC 5.1 4.4 EXTVCC FALLING EXT 4.2 4.2 V 5.0 BIAS = 12V 4.0 4.0 0 5 10 15 20 25 30 35 40 0 20 40 60 80 100 –75 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C) 7812 G22 7812 G23 7812 G24
SENSE Pins Total Input Current Buck SENSE1– Pin Input Bias Boost SENSE Pin Total Input vs VSENSE Voltage Current vs Temperature Current vs Temperature
800 900 200 VIN = 12V 700 SENSE1 PIN 180 800 VOUT > INTVCC + 0.5V 160 SENSE2+ PIN 600 700 140 500 600 120 500 400 100 – CURRENT (µA) 400 300 80 300 SENSE CURRENT (µA) 60 200 SENSE2 PIN SENSE CURRENT (µA) SENSE1 200 40 100 100 20 V SENSE2– PIN 0 0 OUT < INTVCC – 0.5V 0 0 5 10 15 20 25 30 35 40 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 VSENSE COMMON MODE VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 7812 G25 7812 G26 7812 G27 7812fc 8 For more information www.linear.com/LTC7812 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Typical Application Related Parts