Datasheet LT3745-1 (Analog Devices) - 8

LT3745-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Buck Efficiency Shutdown IVIN vs VIN Quiescent IVIN vs VIN
100 5 0.43 95 24VIN, 12VOUT at 1MHz 4 0.42 90 T = 125°C 85 T = 125°C 12VIN, 4VOUT at 500kHz 3 0.41 80 (µA) (mA) I VIN T = 25°C 2 I VIN 0.40 EFFICIENCY (%) 75 48VIN, 4VOUT at 200kHz 70 T = –40°C 1 0.39 65 T = 25°C T = –40°C 60 0 0.38 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 10 20 30 40 50 60 0 10 20 30 40 50 60 LOAD CURRENT (A) VIN (V) VIN (V) 37451 G10 37451 G11 37451 G12
IVCC vs VCC – Channel Off, VCC UVLO Threshold IVCC vs VCC – Shutdown Mode Data Off vs Temperature
500 12.0 2.90 UVLO+ T = 125°C 2.85 400 T = 125°C 11.5 2.80 T = 25°C 300 T = 25°C (µA) (mA) 11.0 (V) 2.75 T = –40°C I VCC V CC 200 T = –40°C I VCC UVLO– 2.70 10.5 100 2.65 0 10.0 2.60 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.0 3.1 3.2 3.3 3.4 3.5 3.6 –50 –25 0 25 50 75 100 125 VCC (V) VCC(V) JUNCTION TEMPERATURE (°C) 37451 G15 37451 G13 37451 G14
EN/UVLO UVLO Threshold (VIN-VCAP) UVLO Threshold vs Temperature vs Temperature Oscillator Frequency fOSC vs RT
1.32 4.90 1000 UVLO+ UVLO+ 1.30 4.80 800 1.28 (V) (V) 4.70 600 1.26 CAP (kHz) - V V EN/UVLO f OSC V IN 4.60 400 1.24 UVLO– UVLO– 1.22 4.50 200 1.20 4.40 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 20 60 100 140 180 220 260 300 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) RT (kΩ) 37451 G16 37451 G17 37451 G18 37451f 8 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Typical Application Related Parts