Datasheet LTC3562 (Analog Devices) - 5

LTC3562
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current Effi ciency vs Load Current Effi ciency vs Load Current
100 100 100 FORCED FORCED FORCED 90 Burst Mode OPERATION 90 Burst Mode OPERATION 90 Burst Mode OPERATION 80 Burst Mode 80 80 600mA 70 OPERATION 70 600mA 70 BUCKS 600mA BUCKS 60 BUCKS 60 60 50 50 PULSE SKIP 50 PULSE SKIP Burst Mode 40 PULSE SKIP 40 Burst Mode 40 OPERATION EFFICIENCY (%) EFFICIENCY (%) OPERATION EFFICIENCY (%) 30 30 30 20 20 20 10 VIN = 3.8V 10 VIN = 3.8V 10 VIN = 3.8V VOUT = 1.2V VOUT = 1.8V VOUT = 2.5V 0 0 0 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 IOUT (mA) IOUT (mA) IOUT (mA) 3562 G01 3562 G02 3562 G03
Effi ciency vs Input Voltage Effi ciency vs Input Voltage Effi ciency vs Load Current Burst Mode Operation Burst Mode Operation
100 100 100 FORCED Burst Mode V V OUT = 1.2V OUT = 1.8V 90 OPERATION 90 90 80 600mA 80 80 BUCKS 70 70 70 60 PULSE SKIP 60 60 50 Burst Mode 50 50 OPERATION 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 IOUT = 0.1mA 30 IOUT = 0.1mA I I 20 20 OUT = 1mA 20 OUT = 1mA IOUT = 10mA IOUT = 10mA 10 VIN = 3.8V 10 IOUT = 100mA 10 IOUT = 100mA VOUT = 3.3V IOUT = 400mA IOUT = 400mA 0 0 0 0.01 0.1 1 10 100 1000 2.5 3 3.5 4 4.5 5 5.5 2.5 3 3.5 4 4.5 5 5.5 IOUT (mA) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3562 G04 3562 G05 3562 G06
Output Transient Output Transient Start-Up Transient Burst Mode Operation Pulse Skip Mode Pulse Skip Mode
VOUT400B VOUT400B 50mV/DIV V 50mV/DIV OUT600A AC 500mV/DIV AC COUPLED COUPLED INDUCTOR VOUT400A VOUT600B CURRENT 50mV/DIV 50mV/DIV I AC AC L = 100mA/ DIV COUPLED COUPLED 300mA 300mA IOUT400B IOUT400B 5mA 5mA RUN600A OFF 2V/DIV ON 3562 G07 3562 G08 3562 G09 50μs/DIV 50μs/DIV 50μs/DIV VOUT400B = 1.2V VOUT400B = 1.8V VOUT600A = 1.2V VOUT400A = 1.2V VOUT600B = 1.2V RLOAD = 6Ω IOUT400A = 20mA IOUT600B = 15mA 3562fa 5