Datasheet LTC3499, LTC3499B (Analog Devices) - 5

LTC3499/LTC3499B
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Burst Mode Quiescent Current VIN and SW Reverse-Battery FB Voltage vs Temperature vs Temperature Current vs VIN and SW Voltage
1.2225 30 1.0 SHDN = 0V 1.2220 VOUT = 0V 25 1.2215 0.5 20 1.2210 TAGE (V) 1.2205 Y CURRENT (µA) 15 0 TTER FB VOL 1.2200 10 1.2195 –0.5 5 1.2190 REVERSE-BA Burst Mode QUIESCENT CURRENT (µA) 1.2185 0 –1.0 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –6 –4 –2 0 2 4 6 TEMPERATURE (°C) TEMPERATURE (°C) VIN AND SW VOLTAGE (V) 3499 G09 3499 G08 3499 G11
Burst Mode Operation Fixed Frequency Discontinous (LTC3499 Only) Load Transient 50mA to 200mA Mode Operation
SW V V OUT 2V/DIV OUT 200mV/DIV 50mV/DIV I 200mA LOAD IL IL 100mA/DIV 100mA/DIV 50mA/DIV 50mA 20µs/DIV 3499 G12 VIN = 2.4V 200µs/DIV 3499 G13 VIN = 2.4V 200ns/DIV 3499 G14 VIN = 2.4V VOUT = 5V VOUT = 5V VOUT = 5V L = 4.7µH ILOAD = 50mA to 200mA L = 4.7µH COUT = 10µF RZ = 100k CFF = 10pF (FEEDFORWARD CAPACITOR FROM CF = 680pF VOUT TO FB) COUT = 10µF L = 4.7µH
Soft-Start into 25Ω Load Fixed Frequency Operation
VIN 2V/DIV SS SW 2V/DIV 2V/DIV VOUT 2V/DIV IL 100mA/DIV IL 200mA/DIV 1ms/DIV 3499G15 VIN = 2.4V 200ns/DIV 3499 G16 VIN = 2.4V VOUT = 5V VOUT = 5V L = 4.7µH L = 4.7µH CSS = 0.01µF COUT = 10µF 3499fc 5