Datasheet LTC3544B (Analog Devices) - 4

LTC3544B Typical perForMance characTerisTics
Efficiency vs Load Current 300mA VREF vs Temperature at 2.25V, Switching Frequency vs Supply Channel. All Other Channels at 3.6V, 5.5V Voltage and Temperature 50% Peak Current
0.815 3.0 100 CHANNEL 200A ILOAD CHANNEL 100 = 50mA ILOAD = 100mA ALL CHANNELS OPERATING 90 0.810 ALL CHANNELS OPERATING 80 70 0805 2.5 60 (V) 0.800 50 V REF 40 0.795 2.0 EFFICIENCY (%) 30 fOSC –40°C 20 VIN = 3.6V 0.790 VIN = 2.25V SWITCHING FREQUENCY (MHz) fOSC 0°C VOUT = 1.8V VIN = 3.6V fOSC 25°C 10 TA = 25°C VIN = 5.5V fOSC 80°C ALL OTHER CHANNELS LOADED 50% 0.785 1.5 0 –50 0 50 100 2 3 4 5 6 0.0001 0.001 0.01 0.1 1 TEMPERATURE (°C) SUPPLY VOLTAGE (V) LOAD CURRENT 300mA CHANNEL (A) 3544B G01 3544B G02 3544B G03
Efficiency vs Load Current 300mA Efficiency vs Load Current 200mA Efficiency vs Load Current 200mA Channel. All Other Channels Off Channel A. All Other Channels Off Channel B. All Other Channels Off
100 90 100 VIN = 2.25V VIN = 2.25V VIN = 2.25V 90 VIN = 3.6V 80 VIN = 3.6V 90 VIN = 3.6V V 80 VIN = 5.5V IN = 5.5V VIN = 5.5V 70 80 70 70 60 60 60 50 50 50 40 40 40 EFFICIENCY (%) EFFICIENCY (%) 30 EFFICIENCY (%) 30 30 20 20 20 VOUT = 1.8V VOUT = 0.8V VOUT = 1.5V 10 TA = 25°C 10 TA = 25°C 10 TA = 25°C ALL OTHER CHANNELS OFF ALL OTHER CHANNELS OFF ALL OTHER CHANNELS OFF 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) 3544B G04 3544B G05 3544B G06
Efficiency vs Load Current 100mA Efficiency vs Supply Voltage, All Channel. All Other Channels Off Channels 50% Loaded Load Regulation, All Channels
100 100 1.2 VIN = 2.25V V 90 IN = 3.6V VIN = 3.6V 1.0 TA = 25°C 80 VIN = 5.5V CHANNELS NOT UNDER 90 TEST HELD AT CONSTANT 70 0.8 50% MAXIMUM LOAD 60 100mA 80 0.6 200mA (A) 50 200mA (B) ERROR (%) 300mA 40 0.4 70 EFFICIENCY (%) EFFICIENCY (%) V OUT 30 VOUT100 = 1.2V 0.2 V 20 OUT200A = 0.8V V 60 V OUT = 1.2V OUT200B = 1.5V 0 10 T V A = 25°C OUT300 = 1.8V ALL OTHER CHANNELS OFF TA = 25°C 0 50 –0.2 0.0001 0.001 0.01 0.1 1 2 3 4 5 0 100 200 300 400 LOAD CURRENT (A) SUPPLY VOLTAGE (V) LOAD (mA) 3544B G07 3544B G08 3544B G09 3544bfb Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagrams Operation Applications Information Package Description Revision History Related Parts