Datasheet LT8631 (Analog Devices) - 6

LT8631
TYPICAL PERFORMANCE CHARACTERISTICS Switching Frequency Burst Frequency No Load Supply Current
525 450 60 RRT = 19.6k VIN = 12V VIN = 12V 520 400 VOUT = 5V L = 22µH 515 50 350 FREQUENCY = 400kHz 510 300 40 505 250 500 30 200 495 CURRENT (µA) FREQUENCY (kHz) 490 150 20 BURST FREQUENCY (kHz) 485 100 10 480 50 VOUT = 3.3V VOUT = 5V 475 0 0 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 45 45 50 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) LOAD CURRENT (mA) TEMPERATURE (°C) 8631 G10 8631 G11 8631 G12
No Load Supply Current Sleep Quiescent Currents Peak Switch Current
25 20 2.1 I 18 QVIN IQVOUT 2.0 20 16 1.9 14 15 12 1.8 10 1.7 10 8 CURRENT (µA) CURRENT (µA) CURRENT (A) 1.6 DUTY CYCLE = 20% 6 DUTY CYCLE = 80% 1.5 5 4 V 1.4 OUT = 3.3V 2 VOUT = 5V 0 0 1.3 0 10 20 30 40 50 60 70 80 90 100 2.5 2.75 3 3.25 3.5 3.75 4 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) TEMPERATURE (°C) 8631 G13 8631 G14 8631 G15
Peak Switch Current Minimum On-Time Switch Resistance
2.3 200 1.4 LOAD = 500mA 180 2.1 1.2 160 1.0 1.9 140 120 0.8 1.7 100 ANCE (Ω) ON-TIME 0.6 TIME (ns) CURRENT (A) 80 1.5 RESIST 60 0.4 40 1.3 0.2 TOP SWITCH 20 BOTTOM SWITCH 1.1 0 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 8631 G16 8631 G17 8631 G18 8631fb 6 For more information www.linear.com/LT8631