Datasheet LTC3404 (Analog Devices) - 5

LTC3404
W U TYPICAL PERFOR A CE CHARACTERISTICS DC Supply Current RDS(ON) vs Input Voltage RDS(ON) vs Temperature vs Input Voltage
0.9 1.2 500 SYNCHRONOUS SWITCH VOUT = 1.8V 0.8 1.1 MAIN SWITCH 450 SYNCHRONOUS 400 0.7 1.0 PULSE SKIPPING SWITCH μA) MODE 0.9 350 ) 0.6 Ω ) Ω 300 ( 0.5 MAIN ( 0.8 VIN = 3V SWITCH 250 0.7 DS(ON) 0.4 DS(ON) VIN = 5V R R 200 0.3 0.6 150 0.2 0.5 DC SUPPLY CURRENT ( 100 0.1 0.4 Burst Mode 50 OPERATION 0 0.3 0 0 1 2 3 4 5 6 7 8 –50 –25 0 25 50 75 100 125 2 3 4 5 6 7 8 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3404 G09 3404 G10 3404 G11
DC Supply Current vs Temperature Switch Leakage vs Temperature Switch Leakage vs Input Voltage
450 2.5 1.2 VIN = 7V RUN = 0V 400 RUN = 0V PULSE SKIPPING 1.0 2.0 350 MODE SYNCHRONOUS μA) μA) SWITCH 300 0.8 1.5 V 250 IN = 3.6V VOUT = 1.5V 0.6 200 1.0 MAIN SWITCH 150 0.4 SUPPLY CURRENT ( SWITCH LEAKAGE ( SYNCHRONOUS SWITCH LEAKAGE (nA) MAIN 100 0.5 SWITCH SWITCH 0.2 Burst Mode 50 OPERATION 0 0 0 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 3404 G12 3404 G13 3404 G20
Burst Mode Operation Pulse Skipping Mode Operation Start-Up from Shutdown
SW SW RUN 5V/DIV 5V/DIV 2V/DIV V V OUT OUT 1V/DIV 50mV/DIV VOUT AC 10mV/DIV COUPLED IL I 500mA/DIV L IL 200mA/DIV 100mA/DIV 10μs/DIV 500ns/DIV 40μs/DIV VIN = 4.2V CIN = 10μF VIN = 4.2V CIN = 10μF VIN = 3.6V CIN = 10μF VOUT = 1.5V COUT = 22μF VOUT = 1.5V COUT = 22μF VOUT = 1.5V COUT = 22μF L = 4.7μH ILOAD = 30mA 3404 G14 L = 4.7μH ILOAD = 30mA 3404 G15 L = 4.7μH ILOAD = 500mA 3404 G16 3404fb 5