Datasheet LT8640, LT8640-1 (Analog Devices) - 6

LT8640/LT8640-1
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds Load Regulation Line Regulation
1.03 0.15 0.12 0.10 1.02 0.10 EN RISING 0.08 1.01 0.06 (%) 0.05 (%) 1.00 OUT OUT 0.04 0.99 0 0.02 0.98 0 EN THRESHOLD (V) –0.05 CHANGE IN V CHANGE IN V –0.02 0.97 EN FALLING –0.10 V –0.04 OUT = 5V VOUT = 5V 0.96 VIN = 12V –0.06 ILOAD = 1A R1/R2 = 100k/24.3k R1/R2 = 100k/24.3k 0.95 –0.15 –0.08 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5 10 15 20 25 30 35 40 45 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8640 G10 8640 G11 8640 G12
No-Load Supply Current Top FET Current Limit vs Duty Cycle Top FET Current Limit
4.0 10.0 12.0 9.5 3.5 9.0 11.0 3.0 8.5 5% DC 2.5 8.0 10.0 7.5 2.0 CURRENT LIMIT (A) CURRENT LIMIT (A) INPUT CURRENT (µA) 7.0 9.0 1.5 VOUT = 3.3V 6.5 L = 4.7µH IN REGULATION 1.0 6.0 8.0 0 5 10 15 20 25 30 35 40 45 0 0.2 0.4 0.6 0.8 1 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8640 G13 8640 G14 8640 G15
Switch Drop Switch Drop Minimum On-Time
150 500 43 SWITCH CURRENT = 1A V 450 SYNC = FLOAT VSYNC = 0V 125 40 400 350 100 37 TOP SWITCH 300 75 250 TOP SWITCH 34 200 31 SWITCH DROP (mV) 50 SWITCH DROP (mV) 150 MINIMUM ON-TIME (ns) 100 25 BOTTOM SWITCH 28 50 BOTTOM SWITCH ILOAD = 2A 0 0 25 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8640 G18 8640 G16 8640 G17 Rev. D 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts