Datasheet LTC3405A (Analog Devices) - 3

LTC3405A
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) 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) 3405A G02 3405A G03 3405A G04
Reference Voltage vs Oscillator Frequency vs Efficiency vs Output Current Temperature Temperature
100 0.814 1.70 VIN = 3.6V VIN = 3.6V 1.65 90 VIN = 2.7V 0.809 1.60 80 0.804 1.55 VIN = 3.6V 70 0.799 1.50 1.45 EFFICIENCY (%) 60 0.794 FREQUENCY (MHz) VIN = 4.2V REFERENCE VOLTAGE (V) 1.40 50 0.789 1.35 VOUT = 1.3V 40 0.784 1.30 0.1 1 10 100 1000 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 OUTPUT CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3405A G05 3405A G06 3405A G07
Oscillator Frequency vs Supply Voltage Output Voltage vs Load Current RDS(ON) vs Input Voltage
1.8 1.834 1.2 1.1 1.7 1.824 1.0 0.9 MAIN SWITCH 1.6 1.814 0.8 Burst Mode ) OPERATION Ω ( 0.7 1.5 1.804 0.6 SYNCHRONOUS DS(0N)R 0.5 SWITCH 1.4 1.794 0.4 OUTPUT VOLTAGE (V) PULSE SKIPPING MODE 0.3 OSCILLATOR FREQUENCY (MHz) 1.3 1.784 0.2 0.1 1.2 1.774 0 2 3 4 5 6 0 100 200 300 400 500 600 0 1 2 3 4 5 6 7 SUPPLY VOLTAGE (V) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3405A G08 3405A G09 3405A G10 3405afa 3