Datasheet LT3503 (Analog Devices) - 4

LT3503
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Maximum Load Current Maximum Load Current Switch Voltage Drop
1.8 1.8 500 V V OUT = 3.3V OUT = 5V L = 2.2µH 1.6 L = 3.3µH 450 1.6 TYPICAL TYPICAL 400 1.4 1.4 TA = 85°C 350 1.2 1.2 TA = 25°C MINIMUM MINIMUM (mV) 300 1.0 1.0 250 0.8 T 0.8 A = –45°C 200 CE(SWITCH) 0.6 0.6 V 150 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 0.4 0.4 100 0.2 0.2 50 0 0 0 4 5 6 7 8 9 10 11 12 6 7 8 9 10 11 12 13 14 15 0 300 600 900 1200 1500 INPUT VOLTAGE (V) INPUT VOLTAGE (V) SWITCH CURRENT (mA) 3503 G04 3503 G07 3503 G03
Undervoltage Lockout Switching Frequency
4.00 2.75 3.90 3.80 2.50 3.70 3.60 3.50 2.25 UVLO (V) 3.40 3.30 2.00 3.20 SWITCHING FREQUENCY (MHz) 3.10 3.00 1.75 –45 –25 –5 15 35 55 75 –45 –25 –5 15 35 55 75 TEMPERATURE (°C) TEMPERATURE (°C) 3503 G08 3503 G09
Frequency Foldback Soft-Start
2.5 2.0 1.8 2.0 1.6 1.4 1.5 1.2 1.0 1.0 0.8 0.6 SWITCH CURRENT LIMIT (A) SWITCHING FREQUENCY (MHz) 0.5 0.4 0.2 0 0 0 100 200 300 400 500 600 700 800 0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 FEEDBACK VOLTAGE (mV) SHDN PIN VOLTAGE (V) 3503 G10 3503 G11 3503f 4