Datasheet LTC3544 (Analog Devices) - 5

LTC3544
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current 300mA Effi ciency vs Load Current 200mA Effi ciency vs Load Current 200mA Channel. All Other Channels Off Channel A. All Other Channels Off Channel B. All Other Channels Off
100 100 100 VIN = 2.25V 90 90 V 90 IN = 3.6V VIN = 4.2V 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 V V OUT = 1.8V OUT = 1.5V 20 20 20 V T IN = 2.25V A = 25°C V V T OUT = 0.8V IN = 2.25V A = 25°C 10 V ALL OTHER IN = 3.6V 10 T V ALL OTHER A = 25°C 10 IN = 3.6V V CHANNELS OFF IN = 4.2V ALL OTHER CHANNELS OFF V CHANNELS OFF IN = 4.2V 0 0 0 0.0001 0.001 0.01 0.1 1 0.0001 0.001 0.01 0.1 1 0.0001 0.001 0.01 0.1 1 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3544 G07 3544 G08 3544 G09
Effi ciency vs Load Current 100mA Load Regulation Start-Up Curves Channel. All Other Channels Off All Channels All Channels
100 1.2 100mA = 1.2V VIN = 3.6V 90 200mA (A) = 0.8V T 1.0 A = 25°C 200mA (B) = 1.5V 80 V 300mA = 1.8V OUT100 70 0.8 VOUT200A 60 V 0.6 OUT200B 50 Burst Mode OPERATION VOUT300 ERROR (%) 0.4 RIPPLE 40 EFFICIENCY (%) OUTV RUNx 30 0.2 20 VOUT = 1.2V VIN = 2.25V TA = 25°C 0 V 200 3544 G12 IN = 3.6V μs/DIV 10 VIN = 3.6V ALL OTHER T V A = 25°C IN = 4.2V CHANNELS OFF 0 –0.2 ALL CHANNELS UNLOADED 0.0001 0.001 0.01 0.1 1 0 100 200 300 400 LOAD CURRENT (A) LOAD (mA) 3544 G10 3544 G11
Load Step Response Load Step Response Load Step Response 300mA Channel 200mA Channel A 200mA Channel B
V V OUT300 OUT200A V 100mV/DIV 50mV/DIV OUT200B 50mV/DIV AC AC AC COUPLED COUPLED COUPLED I I I L L L 250mA/DIV 250mA/DIV 250mA/DIV I I I LOAD LOAD LOAD 250mA/DIV 250mA/DIV 250mA/DIV 3544 G14 3544 G15 V 20 3544 G13 V 20 IN = 3.6V μs/DIV V 20 IN = 3.6V μs/DIV IN = 3.6V μs/DIV V V V OUT = 1.8V OUT = 0.8V OUT = 1.5V T T T A = 25°C A = 25°C A = 25°C I I I LOAD = 600μA TO 300mA LOAD = 600μA TO 200mA LOAD = 600μA TO 200mA 3544fa 5