Datasheet LTC3708 (Analog Devices) - 6

LTC3708
TYPICAL PERFORMANCE CHARACTERISTICS Power Loss vs Load Current Frequency vs Input Voltage Frequency vs Load Current
3.5 V 260 250 IN = 5V 3.0 VOUT = 2.5V 240 IOUT = 15A 200 2.5 VOUT = 1.8V 2.0 220 150 EXTERNAL SYNCHRONIZATION (ANY IOUT) 1.5 200 IOUT = 0A 100 POWER LOSS (W) FREQUENCY (kHz) FREQUENCY (kHz) 1.0 FORCED CONTINUOUS MODE 180 50 0.5 EXTERNAL SYNCHRONIZATION DISCONTINUOUS MODE 0 160 0 10 100 1000 10000 100000 5 10 15 20 25 0 5 10 15 LOAD (mA) INPUT VOLTAGE (V) LOAD CURRENT (A) 3707 G07 3708 G08 3708 G09
Current Sense Threshold On-Time vs ION Current On-Time vs Temperature vs ITH Voltage
10000 300 300 V I RNG = 2V ON = 30µA 250 1.4V 250 200 1V 150 1000 200 0.7V 100 150 50 0.5V ION = 60µA ON-TIME (ns) ON-TIME (ns) 0 100 100 –50 –100 50 CURRENT SENSE THRESHOLD (mV) –150 10 0 –200 1 10 100 1000 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 ION CURRENT (µA) TEMPERATURE (°C) ITH VOLTAGE (V) 3708 G10 3708 G11 3708 G12
Maximum Current Sense Maximum Current Sense Load Regulation Threshold vs VRNG Voltage Threshold vs Temperature (Figure 13 Circuit)
350 160 0 VRNG = 1V 300 –0.1 150 FORCED 250 –0.2 CONTINUOUS MODE 200 140 –0.3 (%) 150 –0.4 130 ∆V OUT DISCONTINUOUS MODE 100 –0.5 120 50 –0.6 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 110 –0.7 0.5 0.75 1 1.25 1.5 1.75 2 –50 –25 0 25 50 75 100 125 150 0 3 6 9 12 15 VRNG VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (A) 3708 G13 3708 G14 3708 G15 3708fc 6 For more information www.linear.com/LTC3708 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts