Datasheet LT3748 (Analog Devices) - 5

LT3748
typical perForMance characteristics TA = 25°C, unless otherwise noted. EN/UVLO Threshold EN/UVLO Current vs Temperature vs Temperature TC Pin Voltage vs Temperature
3.0 1.40 0.9 1.35 0.8 2.5 VEN/UVLO = 1.1V 1.30 0.7 2.0 0.6 VEN/UVLO = 0.9V 1.25 0.5 1.5 1.20 0.4 1.15 1.0 TC VOLTAGE (V) 0.3 EN/UVLO CURRENT (µA) EN/UVLO THRESHOLD (V) 1.10 0.2 0.5 1.05 0.1 VEN/UVLO = 1.3V 0 1.00 0 –55 –25 0 25 50 75 100 125 150 –55 –25 0 25 50 75 100 125 150 –55 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3748 G10 3748 G11 3748 G12
Error Amplifier Transconductance Error Amplifier Output Current SENSE Pin Threshold vs Temperature vs RREF Pin Voltage vs Temperature
200 60 160 190 50 140 OVERCURRENT 40 180 30 120 170 20 VC = 2.2V 160 100 10 150 (µA) 0 80 I VC 140 –10 60 –20 130 –30 150°C SENSE THRESHOLD (mV) 40 TRANSCONDUCTANCE (µmhos) 120 –40 100°C V 110 VIN = 100V 25°C 20 C = 0.2V V –50 IN = 6V –50°C 100 –60 0 –55 –25 0 25 50 75 100 125 150 0 0.5 1.0 1.5 2.0 2.5 –55 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VREF (V) TEMPERATURE (°C) 3748 G13 3748 G14 3748 G15
Maximum Discontinuous Off-Time GATE Rise and Fall Time vs Temperature GATE Rise and Fall Time vs Charge vs INTVCC Voltage
30 2.0 AVERAGE GATE SOURCE, SINK CURRENT (A) 25 CGATE = 3.3nF 29 t AVERAGE 1.5 r, tf 10% TO 90% 28 CURRENT 20 FALLING 27 50 1.0 26 RISING 40 0.5 15 ALL TIME (ns) 25 RISE TIME 30 0 24 10 FALL TIME 23 20 TE RISE AND F 22 GATE RISE AND FALL TIME (ns) Q = C • V GA 5 10 21 VINTVCC = 7V MAXIMUM DISCONTINUOUS OFF-TIME (µs) tr, tf 10% TO 90% 20 0 0 –55 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 120 0 5 10 15 20 TEMPERATURE (°C) TOTAL GATE CHARGE (nC) VINTVCC (V) 3748 G16 3748 G17 3748 G18 3748fb For more information www.linear.com/LT3748 5 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 Package Description Typical Application Related Parts