Datasheet LTC3769 (Analog Devices) - 7

LTC3769
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. EXTVCC Switchover and INTVCC Oscillator Frequency INTV Voltages vs Temperature CC vs INTVCC Load Current vs Temperature
5.50 V 6.0 600 IN = 12V 5.45 5.8 FREQ = INTVCC 5.40 5.6 550 EXTVCC = 0V INTV 5.35 CC 5.4 500 5.30 5.2 TAGE (V) VOLTAGE (V) 5.25 CC 5.0 VOL 450 EXTVCC RISING V CC 5.20 4.8 EXTVCC = 6V INT 5.15 AND INTV 4.6 FREQUENCY (kHz) 400 CC 5.10 4.4 EXTV FREQ = GND CC FALLING EXTV 350 5.05 4.2 5.00 4.0 300 0 20 40 60 80 100 120 140 160 180 200 –60 –35 –10 15 40 65 90 115 140 –60 –35 –10 15 40 65 90 115 140 INTVCC LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3769 G17 3769 G18 3769 G19
Oscillator Frequency Maximum Current Sense SENSE Pin Input Current vs Input Voltage Threshold vs ITH Voltage vs Temperature
360 120 260 FREQ = GND VSENSE = 12V 358 100 240 ILIM = FLOAT 220 356 SENSE+ PIN 80 PULSE-SKIPPING MODE 200 354 60 Burst Mode 180 352 OPERATION 160 40 140 350 20 120 348 I 100 0 LIM = GND 346 ILIM = FLOAT SENSE CURRENT (µA) 80 –20 ILIM = INTVCC 60 OSCILLATOR FREQUENCY (kHz) 344 40 342 –40 FORCED CONTINUOUS MODE MAXIMUM CURRENT SENSE VOLTAGE (mV) 20 SENSE– PIN 340 –60 0 5 10 15 20 25 30 35 40 45 50 55 60 65 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 –60 –35 –10 15 40 65 90 115 140 INPUT VOLTAGE (V) I TEMPERATURE (°C) 3769 G20 TH VOLTAGE (V) 3769 G21 3769 G22
SENSE Pin Input Current SENSE Pin Input Current vs ITH Voltage vs VSENSE Voltage
260 260 240 VSENSE = 12V ILIM = INTVCC 240 SENSE+ PIN ILIM = INTVCC 220 I 220 LIM = FLOAT ILIM = FLOAT 200 SENSE+ PIN 200 180 ILIM = GND 180 ILIM = GND 160 160 140 140 120 120 100 100 SENSE CURRENT (µA) 80 SENSE CURRENT (µA) 80 60 60 ILIM = INTVCC 40 ILIM = INTVCC 40 I I LIM = FLOAT 20 LIM = FLOAT 20 SENSE– PIN I I LIM = GND LIM = GND SENSE– PIN 0 0 0 0.5 1 1.5 2 2.5 3 5 10 15 20 25 30 35 40 45 50 55 60 65 ITH VOLTAGE (V) VSENSE COMMON MODE VOLTAGE (V) 3769 G23 3769 G24 3769fa For more information www.linear.com/LTC3769 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts