Datasheet LTC1878 (Analog Devices) - 4

LTC1878
W U TYPICAL PERFOR A CE CHARACTERISTICS Reference Voltage Oscillator Frequency Efficiency vs Output Current vs Temperature vs Temperature
95 0.814 605 VIN = 3.6V VIN = 3.6V 595 V 90 IN = 3V 0.809 585 575 85 V 0.804 IN = 3.6V 565 VIN = 4.2V 555 80 0.799 VIN = 6V 545 EFFICIENCY (%) 75 535 0.794 FREQUENCY (kHz) REFERENCE VOLTAGE (V) 525 70 0.789 515 VOUT = 1.8V 505 L = 10µH 65 0.784 495 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) 1878 G04 1878 G05 1878 G06
Oscillator Frequency vs Supply Voltage Output Voltage vs Load Current RDS(ON) vs Input Voltage
605 1.83 0.9 595 0.8 1.82 585 SYNCHRONOUS 0.7 575 SWITCH 1.81 0.6 565 ) Ω ( 555 0.5 MAIN 1.80 SWITCH 545 DS(ON) 0.4 R 535 1.79 0.3 525 OUTPUT VOLTAGE (V) 0.2 OSCILLATOR FREQUENCY (kHz) 515 1.78 PULSE SKIPPING MODE V 505 IN = 3.6V 0.1 L = 10µH 495 1.77 0 0 2 4 6 8 0 100 200 300 400 500 600 700 800 900 0 1 2 3 4 5 6 7 8 SUPPLY VOLTAGE (V) LOAD CURRENT (mA) INPUT VOLTAGE (V) 1878 G07 1878 G08 1878 G09
DC Supply Current DC Supply Current RDS(ON) vs Temperature vs Input Voltage vs Temperature
1.2 250 300 SYNCHRONOUS SWITCH VOUT = 1.8V VIN = 3.6V 1.1 MAIN SWITCH PULSE SKIPPING 200 250 MODE 1.0 µA) µA) PULSE SKIPPING 0.9 200 ) MODE Ω 150 ( 0.8 VIN = 3V 150 0.7 DS(ON) VIN = 5V R 100 0.6 100 SUPPLY CURRENT ( 0.5 DC SUPPLY CURRENT ( 50 Burst Mode 50 Burst Mode 0.4 OPERATION OPERATION 0.3 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 1878 G10 1878 G11 1878 G12 4