Datasheet LT1913 (Analog Devices) - 4

LT1913
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency Effi ciency Effi ciency
100 100 100 3.0 VIN = 12V 90 90 VIN = 12V 90 2.5 TOT AL POWER LOSS (W) 80 VIN = 24V 80 80 2.0 VIN = 24V 70 70 70 1.5 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) V 60 IN = 12V V 60 60 1.0 OUT = 5V VOUT = 3.3V VOUT = 5V L = 4.7μH L = 3.3μH L = 4.7μH f = 600kHz f = 600kHz f = 600kHz 50 50 50 0.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 OUTPUT CURRENT (A) OUTPUT CURRENT (A) OUTPUT CURRENT (A) 1913 G01 1913 G02 1913 G03
Maximum Load Current Maximum Load Current Switch Current Limit
5.5 5.5 6.0 TYPICAL 5.0 5.5 5.0 TYPICAL 4.5 5.0 MINIMUM 4.5 4.0 MINIMUM 4.5 4.0 3.5 4.0 LOAD CURRENT (A) LOAD CURRENT (A) VOUT = 3.3V VOUT = 5V SWITCH CURRENT LIMIT(A) 3.5 3.0 TA = 25°C TA = 25°C 3.5 L = 4.7μH L = 4.7μH f = 600kHz f = 600kHz 2.5 3.0 3.0 5 10 15 20 25 5 10 15 20 25 0 20 40 60 80 100 INPUT VOLTAGE (V) INPUT VOLTAGE (V) DUTY CYCLE (%) 1913 G06 1913 G08 1913 G07
Switch Current Limit Switch Voltage Drop Boost Pin Current
6.5 700 120 6.0 105 600 5.5 DUTY CYCLE = 10 % 90 500 5.0 75 DUTY CYCLE = 90 % 4.5 400 60 4.0 300 TAGE DROP (mV) 45 3.5 VOL 200 SWITCH CURRENT LIMIT (A) 3.0 BOOST PIN CURRENT (mA) 30 100 2.5 15 2.0 0 0 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 0 1 2 3 4 5 TEMPERATURE (°C) SWITCH CURRENT (A) SWITCH CURRENT (A) 1913 G09 1913 G10 1913 G11 1913f 4