Datasheet LTC3448 (Analog Devices) - 4

LTC3448
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Efficiency vs Input Voltage Efficiency vs Load Current Efficiency vs Load Current
100 100 100 VOUT = 1.8V VOUT = 1.2V VOUT = 1.5V 95 IOUT = 100mA TA = 25°C 90 T 90 A = 25°C TA = 25°C 90 80 80 85 IOUT = 30mA 70 70 80 I 60 60 OUT = 600mA 75 50 50 70 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 30 30 60 20 V 20 IN = 2.7V VIN = 2.7V 55 10 VIN = 3.6V 10 VIN = 3.6V VIN = 4.2V VIN = 4.2V 50 0 0 2 3 4 5 6 0.0001 0.001 0.01 0.1 1 0.0001 0.001 0.01 0.1 1 INPUT VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3448 G01 23448 G02 23448 G03
Efficiency vs Load Current Reference Voltage Oscillator Frequency (Switcher Only) vs Temperature vs Temperature
100 0.615 1.70 VIN = 2.7V VIN = 3.6V VIN = 3.6V 90 VOUT = 2.5V 1.65 T 0.610 80 A = 25°C 1.60 70 0.605 1.55 60 50 0.600 1.50 40 1.45 EFFICIENCY (%) 0.595 30 FREQUENCY (MHz) REFERENCE VOLTAGE (V) 1.40 20 0.590 1.35 10 0 0.585 1.30 0.0001 0.001 0.01 0.1 1 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 LOAD CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 23448 G04 3448 G05 3448 G06
Oscillator Frequency vs Supply Voltage Output Voltage vs Load Current RDS(ON) vs Input Voltage
1.8 1.525 0.40 TA = 25°C VIN = 3.6V TA = 25°C 1.520 TA = 25°C 0.38 1.7 1.515 0.36 MAIN 1.510 0.34 1.6 SWITCH ) 1.505 Ω 0.32 ( 1.5 1.500 0.30 SYNCHRONOUS 1.495 DS(ON)R 0.28 SWITCH FREQUENCY (MHz) 1.4 OUTPUT VOLTAGE (V) 1.490 0.26 1.485 0.24 1.3 1.480 0.22 1.2 1.475 0.20 2 3 4 5 6 0.0001 0.001 0.01 0.1 1 2 3 4 5 6 SUPPLY VOLTAGE (V) LOAD CURRENT (A) INPUT VOLTAGE (V) 3448 G07 3448 G08 3448 G09 3448f 4