Datasheet LTC3405A (Analog Devices) - 4

LTC3405A
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Dynamic Supply Current RDS(ON) vs Temperature Dynamic Supply Current vs Temperature
1.2 1600 600 V V OUT = 1.8V IN = 3.6V VIN = 4.2V 1400 I V LOAD = 0A OUT = 1.8V 1.0 A) A) V 500 I IN = 2.7V VIN = 3.6V µ µ LOAD = 0A 1200 0.8 400 PULSE SKIPPING MODE ) 1000 Ω ( 0.6 800 300 DS(ON)R 600 0.4 PULSE SKIPPING MODE 200 400 0.2 DYNAMIC SUPPLY CURRENT ( DYNAMIC SUPPLY CURRENT ( 100 SYNCHRONOUS SWITCH 200 Burst Mode OPERATION MAIN SWITCH Burst Mode OPERATION 0 0 0 –50 –25 0 25 50 75 100 125 2 3 4 5 6 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SUPPLY VOLTAGE (V) TEMPERATURE (°C) 3405A G12 3405A G11 3405A G13
Switch Leakage vs Temperature Switch Leakage vs Input Voltage Burst Mode Operation
160 60 VIN = 5.5V RUN = 0V 140 RUN = 0V 50 SW 120 SYNCHRONOUS 5V/DIV SWITCH 40 100 VOUT 100mV/DIV 80 30 AC COUPLED 60 20 SWITCH LEAKAGE (nA) SYNCHRONOUS SWITCH LEAKAGE (pA) 40 SWITCH I MAIN SWITCH L 100mA/DIV 10 20 MAIN SWITCH 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 V 5 IN = 3.6V µs/DIV TEMPERATURE (°C) INPUT VOLTAGE (V) VOUT = 1.8V ILOAD = 20mA 3405A G14 3405A G15 3405A G16
Pulse Skipping Mode Operation Start-Up from Shutdown Load Step
VOUT SW RUN 100mV/DIV 5V/DIV 2V/DIV AC COUPLED VOUT VOUT 1V/DIV 10mV/DIV IL AC 200mA/DIV COUPLED IL 200mA/DIV I I LOAD L 200mA/DIV 100mA/DIV V 500ns/DIV IN = 3.6V V 100 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 20mA ILOAD = 250mA ILOAD = 0mA TO 250mA 3405A G17 3405A G18 3405A G19 PULSE SKIPPING MODE 3405afa 4