Datasheet LTC3541-1 (Analog Devices) - 5

LTC3541-1
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Input Voltage for Efficiency vs Input Voltage for Efficiency vs Load Current for Buck (Burst) Buck (Pulse Skip) Buck (Burst)
100 100 100 VOUT = 1.8V VOUT = 1.8V 95 95 90 VIN = 2.7V 90 IOUT = 500mA 90 IOUT = 500mA 80 VIN = 4.2V 85 85 70 VIN = 3.6V IOUT = 100mA 80 IOUT = 30mA 80 60 75 75 50 IOUT = 100mA 70 70 40 EFFICIENCY (%) EFFICIENCY (%) IOUT = 30mA EFFICIENCY (%) 65 65 30 60 60 20 55 55 10 V 50 50 0 OUT = 1.8V 2 3 4 5 6 2 3 4 5 6 0.1 1 10 100 1000 INPUT VOLTAGE (V) INPUT VOLTAGE (V) LOAD CURRENT (mA) 35411 G01 35411 G02 35411 G03
Efficiency vs Load Current for Efficiency vs Load Current for Efficiency vs Load Current for Buck (Pulse Skip) Buck (Burst) Buck (Pulse Skip)
100 100 100 VOUT = 1.8V VIN = 2.7V VOUT = 2.5V 90 VIN = 2.7V 90 90 VIN = 4.2V VIN = 2.7V 80 VIN = 3.6V 80 V 80 V IN = 3.6V VIN = 3.6V VIN = 4.2V 70 IN = 4.2V 70 70 60 60 60 50 50 50 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 20 20 20 10 10 10 VOUT = 2.5V 0 0 0 0.1 1 10 100 1000 0.1 1 10 100 1000 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 35411 G04 35411 G05 35411 G06
VLDO Dropout Voltage vs Buck (Burst) Plus VLDO Bias Output (Auto Start-Up Sequence, Load Current Current vs VLDO Load Current Buck in Pulse Skip) vs Time
100 250 VOUT = 1.5V VIN = 3.6V V V I OUT IN = 3V LOAD(BUCK) = 0 2V/DIV 80 200 IBIAS = IVIN + ILVIN – ILOAD VIN = 3.6V LV µA) OUT 2V/DIV 60 150 VIN = 4.2V VIN 40 100 2V/DIV BIAS CURRENT ( DROPOUT VOLTAGE (mV) 20 50 IVOUT = 400mA 4ms/DIV 35411 G09 ILVOUT = 30mA 0 0 0 50 100 150 200 250 300 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) 35411 G07 35411 G08 35411fb For more information www.linear.com/LTC3541-1 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts