Datasheet LTC3423, LTC3424 (Analog Devices) - 4

LTC3423/LTC3424
W U TYPICAL PERFOR A CE CHARACTERISTICS Converter Efficiency 1.2V to 1.8V LTC3424 Current Limit LTC3423 Current Limit
100 3.4 1.80 300MHz 90 Burst Mode 3.2 1.75 80 OPERATION 3MHz 1.70 70 3.0 60 1.65 1MHz 2.8 50 1.60 40 2.6 EFFICIENCY (%) CURRENT (A) CURRENT (A) 1.55 30 2.4 1.50 20 2.2 10 1.45 WITH MBRM120T3 SCHOTTKY 0 2.0 1.40 0.1 1 10 100 1000 –55 –15 25 65 105 125 –55 –15 25 65 105 125 OUTPUT CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3223/24 G05 3423/24 G06 3423/24 G07
EA FB Voltage Oscillator Frequency Accuracy NMOS RDS(ON)
1.28 2.10 0.30 RT = 15k VOUT = 1.8V VDD = 3.3V 1.27 0.25 2.05 ) 1.26 Ω 0.20 1.25 2.00 VOLTAGE (V) 0.15 1.24 FREQUENCY (MHz) RESISTANCE ( 1.95 0.10 1.23 1.22 1.90 0.05 –55 –15 25 65 105 125 –55 –15 25 65 105 125 –55 –15 25 65 105 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3423/24 G08 3423/24 G09 3423/24 G10
Efficiency Loss Without Schottky PMOS R vs Frequency DS(ON)
0.40 14 VOUT = 1.8V TA = 25°C VDD = 3.3V 12 0.35 10 ) Ω 0.30 8 6 0.25 RESISTANCE ( EFFICIENCY LOSS (%) 4 0.20 2 0.15 0 –55 –15 25 65 105 125 0.2 0.6 1.0 1.4 1.8 2.2 2.6 3.0 TEMPERATURE (°C) FREQUENCY (MHz) 3423/24 G11 3423/24 G12 34234f 4