Datasheet LTC3405A-1.5, LTC3405A-1.8 (Analog Devices) - 4

LTC3405A-1.5/LTC3405A-1.8
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a) Dynamic Supply Current Dynamic Supply Current vs Supply Voltage vs Temperature Switch Leakage vs Temperature
1800 160 340 VOUT = 1.8V V V IN = 3.6V IN = 5.5V 1600 ILOAD = 0A 300 VOUT = 1.8V 140 RUN = 0V ILOAD = 0A 1400 260 PULSE SKIPPING MODE 120 A) A) µ 1200 µ 220 100 1000 180 80 800 140 60 600 SYNCHRONOUS 100 SUPPLY CURRENT ( SWITCH LEAKAGE (nA) SUPPLY CURRENT ( 40 400 PULSE SKIPPING MODE SWITCH 60 MAIN SWITCH 200 20 BURST MODE OPERATION BURST MODE OPERATION 20 0 0 0 2 2.5 3 3.5 4 4.5 5 5.5 –50 50 100 125 –25 0 25 50 75 100 125 –50 –25 0 25 75 SUPPLY VOLTAGE (V) TEMPERATURE ( TEMPERATURE ( °C) °C) 3405A1518 G12 3405F G14 3405A1518 G13
Switch Leakage vs Input Voltage Burst Mode Operation Pulse Skipping Mode Operation
60 RUN = 0V 50 SW SW SYNCHRONOUS 5V/DIV 5V/DIV SWITCH 40 VOUT V 100mV/DIV OUT 10mV/DIV 30 AC COUPLED AC COUPLED 20 SWITCH LEAKAGE (pA) I MAIN SWITCH L 100mA/DIV IL 10 100mA/DIV 0 0 1 2 3 4 5 6 V 5 IN = 3.6V µs/DIV V 500ns/DIV IN = 3.6V INPUT VOLTAGE (V) VOUT = 1.8V VOUT = 1.8V ILOAD = 20mA ILOAD = 20mA 3405F G15 3405A1518 G16 3405A1518 G17
Start-Up from Shutdown Load Step
VOUT RUN 100mV/DIV 2V/DIV AC COUPLED VOUT 1V/DIV IL 200mA/DIV IL 200mA/DIV ILOAD 200mA/DIV V 100 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV VOUT = 1.8V VOUT = 1.8V ILOAD = 250mA ILOAD = 0mA TO 250mA 3405A1518 G18 3405A1518 G19 PULSE SKIPPING MODE 3405a1518fa 4