Datasheet LTC3405A-1.5, LTC3405A-1.8 (Analog Devices) - 3

LTC3405A-1.5/LTC3405A-1.8
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a) Efficiency vs Input Voltage Efficiency vs Output Current Efficiency vs Output Current
95 100 100 IOUT = 100mA 90 90 V V IN = 3.6V IN = 2.7V 90 85 80 I IOUT = 10mA V OUT = 250mA IN = 4.2V I 70 80 OUT = 1mA 80 VIN = 3.6V 60 75 V V IN = 3.6V IN = 4.2V 50 70 70 V V IN = 4.2V IN = 5.5V 40 EFFICIENCY (%) 65 EFFICIENCY (%) EFFICIENCY (%) 60 30 IOUT = 0.1mA 60 20 PULSE SKIPPING MODE Burst Mode OPERATION 50 55 Burst Mode OPERATION 10 VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V 50 0 40 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.1 1 10 100 1000 0.1 1 10 100 1000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3405A1518 G02 3405A1518 G03 3405A1518 G04
Oscillator Frequency vs Oscillator Frequency vs Efficiency vs Output Current Temperature Supply Voltage
100 1.70 1.8 VOUT = 1.5V VIN = 3.6V VIN = 2.7V 1.65 90 1.7 1.60 VIN = 3.6V 80 1.6 1.55 VIN = 4.2V 70 1.50 1.5 1.45 EFFICIENCY (%) 60 FREQUENCY (MHz) 1.4 1.40 50 OSCILLATOR FREQUENCY (MHz) 1.3 1.35 40 1.30 1.2 0.1 1 10 100 1000 –50 –25 0 25 50 75 100 125 2 3 4 5 6 OUTPUT CURRENT (mA) TEMPERATURE (°C) SUPPLY VOLTAGE (V) 3405A1518 G08 3405A1518 G05 3405A1518 G07
Output Voltage vs Load Current RDS(ON) vs Input Voltage RDS(ON) vs Temperature
1.834 1.2 1.2 1.1 VIN = 4.2V 1.824 1.0 1.0 VIN = 2.7V VIN = 3.6V 0.9 MAIN SWITCH 1.814 0.8 0.8 Burst Mode ) Ω OPERATION Ω ( 0.7 ( 1.804 0.6 0.6 SYNCHRONOUS DS(0N) DS(ON) R 0.5 SWITCH R 1.794 0.4 0.4 OUTPUT VOLTAGE (V) PULSE SKIPPING MODE 0.3 1.784 0.2 0.2 SYNCHRONOUS SWITCH 0.1 MAIN SWITCH 1.774 0 0 0 100 200 300 400 500 600 0 1 2 3 4 5 6 7 –50 –25 0 25 50 75 100 125 LOAD CURRENT (mA) INPUT VOLTAGE (V) TEMPERATURE (°C) 3405A1518 G09 3405A1518 G10 3405F G11 3405a1518fa 3