Datasheet LT3493 (Analog Devices) - 4

LT3493
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Maximum Load Current, Maximum Load Current, Maximum Load Current, VOUT = 5V, L = 8.2μH VOUT = 5V, L = 33μH VOUT = 3.3V, L = 4.7μH
1.60 1.60 1.60 1.50 1.50 1.50 TYPICAL TYPICAL TYPICAL 1.40 1.40 1.40 1.30 1.30 1.30 MINIMUM 1.20 1.20 1.20 MINIMUM MINIMUM OUTPUT CURRENT (A) 1.10 OUTPUT CURRENT (A) 1.10 OUTPUT CURRENT (A) 1.10 1.00 1.00 1.00 0.90 0.90 0.90 8 12 16 20 24 28 8 12 16 20 24 28 5 10 15 20 25 30 VIN (V) VIN (V) VIN (V) 3493 G04 3493 G22 3493 G05
Maximum Load Current, VOUT = 3.3V, L = 10μH Switch Voltage Drop Undervoltage Lockout
1.60 550 4.00 500 3.90 1.50 450 TYPICAL T 3.80 A = 85°C 400 1.40 TA = 25°C 3.70 350 3.60 1.30 (mV) 300 T MINIMUM A = –40°C 3.50 250 1.20 CE(SW) UVLO (V) V 3.40 200 OUTPUT CURRENT (A) 1.10 150 3.30 100 3.20 1.00 50 3.10 0.90 0 3.00 5 10 15 20 25 30 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 –50 –25 0 25 50 75 100 125 150 VIN (V) SWITCH CURRENT (A) TEMPERATURE (°C) 3493 G21 3493 G06 3493 G08
Switching Frequency Frequency Foldback Soft-Start
800 800 2.0 780 1.8 700 760 1.6 600 740 1.4 720 500 1.2 700 400 1.0 680 0.8 300 FREQUENCY (kHz) 660 0.6 200 640 SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT (A) 0.4 620 100 0.2 600 0 0 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 TEMPERATURE (°C) FEEDBACK VOLTAGE (mV) SHDN PIN VOLTAGE (V) 3493 G09 3493 G11 3493 G13 3493fb 4