Datasheet LT3745 (Analog Devices) - 8

LT3745
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 12V 3 IN, 4VOUT at 500kHz 0.41 80 (µA) (mA) I VIN 2 I VIN T = 25°C 0.40 EFFICIENCY (%) 75 48VIN, 4VOUT at 200kHz 70 T = –40°C 1 0.39 T = 25°C 65 T = –40°C 0 60 0 10 20 30 40 50 60 0.38 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 V 0 10 20 30 40 50 60 LOAD CURRENT (A) IN (V) 3745 G11 VIN (V) 3745 G10 3745 G12
VCC UVLO Threshold IVCC vs VCC – Shutdown Mode IVCC vs VCC – Channel Off, Data Off vs Temperature
8 3.35 2.90 UVLO+ 3.30 2.85 6 T = 125°C 3.25 T = 125°C 2.80 3.20 (µA) 4 (mA) T = 25°C (V) 2.75 I VCC I VCC 3.15 V CC UVLO– 2.70 2 3.10 T = –40°C T = 25°C T = –40°C 3.05 2.65 0 3.00 2.60 3.0 3.5 4.0 4.5 5.0 5.5 3.0 3.5 4.0 4.5 5.0 5.5 –50 –25 0 25 50 75 100 125 VCC (V) VCC (V) JUNCTION TEMPERATURE (°C) 3745 G13 3745 G14 3745 G15
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) 4.70 600 (V) CAP (kHz) 1.26 - V f OSC V EN/UVLO V IN 4.60 400 1.24 UVLO– UVLO– 4.50 200 1.22 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) R 3745 G16 3745 G17 T (kΩ) 3745 G18 3745f 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