Datasheet LT3493-3 (Analog Devices) - 4

LT3493-3
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Maximum Load Current, Maximum Load Current, Maximum Load Current, VOUT = 5V, L = 8.2
µ
H V V OUT = 5V, L = 33
µ
H OUT = 3.3V, L = 4.7
µ
H
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) V V IN (V) IN (V) 3493-3 G04 3493-3 G22 3493-3 G05
Maximum Load Current, VOUT = 3.3V, L = 10
µ
H Switch Voltage Drop Undervoltage Lockout
1.60 550 7.0 500 6.9 1.50 450 TYPICAL T 6.8 A = 85°C 400 1.40 T 6.7 A = 25°C 350 6.6 1.30 (mV) 300 TA = –40°C MINIMUM 6.5 250 1.20 CE(SW) UVLO (V) V 6.4 200 OUTPUT CURRENT (A) 1.10 150 6.3 100 6.2 1.00 50 6.1 0.90 0 6.0 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 V SWITCH CURRENT (A) IN (V) TEMPERATURE (°C) 3493-3 G21 3493-3 G06 3493-3 G07
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 SWITCH CURRENT LIMIT (A) SWITCHING FREQUENCY (kHz) 0.4 100 620 0.2 600 0 0 –50 –25 0 25 50 75 100 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) 3493-3 G09 3493-3 G11 3493-3 G13 3493-3f 4