Datasheet LT3684 (Analog Devices) - 4

LT3684
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Efficiency (VOUT = 5.0V) Efficiency (VOUT = 3.3V) Efficiency
100 90 90 VIN = 7V VIN = 12V V 85 85 IN = 12V 90 80 80 VIN = 24V V V IN = 12V VIN = 24V IN = 24V 80 75 75 70 70 70 EFFICIENCY (%) EFFICIENCY (%) 65 EFFICIENCY (%) 65 60 60 60 VOUT = 3.3V L: NEC PLC-0745-4R7 55 L: NEC PLC-0745-4R7 55 L = 10µH f = 800kHz f = 800kHz LOAD = 1A 50 50 50 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.5 1 1.5 2 2.5 3 LOAD CURRENT (A) LOAD CURRENT (A) SWITCHING FREQUENCY (MHz) 3684 G01 3684 G02 3684 G03
Maximum Load Current Maximum Load Current Switch Current Limit
4.0 4.0 4.0 3.5 3.5 3.5 TYPICAL TYPICAL 3.0 3.0 3.0 2.5 2.5 2.5 MINIMUM MINIMUM LOAD CURRENT (A) 2.0 LOAD CURRENT (A) 2.0 2.0 VOUT = 3.3V VOUT = 5V SWITCH CURRENT LIMIT (A) 1.5 TA = 25°C 1.5 TA = 25°C 1.5 L = 4.7µH L = 4.7µH f = 800kHz f = 800kHz 1.0 1.0 1.0 5 10 15 20 25 30 5 10 15 20 25 30 0 20 40 60 80 100 INPUT VOLTAGE (V) INPUT VOLTAGE (V) DUTY CYCLE (%) 3684 G04 3684 G05 3684 G06
Switch Current Limit Switch Voltage Drop Boost Pin Current
4.5 700 90 4.0 DUTY CYCLE = 10 % 600 80 3.0 70 500 60 2.5 DUTY CYCLE = 90 % 400 50 2.0 300 40 1.5 30 VOLTAGE DROP (mV) 200 SWITCH CURRENT LIMIT (A) 1.0 BOOST PIN CURRENT (mA) 20 0.5 100 10 0 0 0 –50 –25 0 25 50 75 100 125 0 500 1000 1500 2000 2500 3000 3500 0 500 1000 1500 2000 2500 3000 3500 TEMPERATURE (°C) SWITCH CURRENT (mA) SWITCH CURRENT (mA) 3684 G07 3684 G08 3684 G09 3684fa 4 For more information www.linear.com/LT3684