Datasheet LTC3569 (Analog Devices) - 5

LTC3569
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs VSUPPLY Efficiency vs VSUPPLY Efficiency vs VSUPPLY OUT1 = 1.8V OUT2 = 1.2V OUT3 = 1.5V
95 95 95 BUCK1 ONLY BUCK2 ONLY BUCK3 ONLY 90 90 90 85 85 85 80 80 80 EFFICIENCY (%) 75 EFFICIENCY (%) 75 EFFICIENCY (%) 75 ILOAD = 270mA ILOAD = 210mA ILOAD = 210mA 70 ILOAD = 220mA 70 ILOAD = 170mA 70 ILOAD = 170mA ILOAD = 170mA ILOAD = 110mA ILOAD = 110mA ILOAD = 120mA ILOAD = 70mA ILOAD = 70mA 65 65 65 2 3 4 5 6 2 3 4 5 6 2 3 4 5 6 VSUPPLY (V) VSUPPLY (V) VSUPPLY (V) 3569 G04 3569 G05 3569 G06
Oscillator Frequency RDS(ON) SW1 RDS(ON) SW2 and SW3 vs Temperature vs VSUPPLY and Temperature vs VSUPPLY and Temperature
2.40 0.35 0.50 V NSW1 NSW2 & 3 IN = 5.5V 100°C 100°C PSW1 0.45 PSW3 & 3 0.30 2.30 VIN = 3.5V 0.40 25°C 25°C 0.25 0.35 (Ω) (Ω) (MHz) 2.20 VIN = 2.5V 0.30 f CLK R DS(ON) 0.20 R DS(ON) 0.25 –50°C 2.10 0.20 0.15 –50°C 0.15 VRT = SVIN 2.00 0.10 0.10 –50 0 50 100 150 2 3 4 5 6 2 3 4 5 6 TEMPERATURE (°C) VSUPPLY (V) VSUPPLY (V) 3569 G07 3569 G08 3569 G09
ISVIN VFB vs Temperature ISVIN vs VSUPPLY Pulse-Skipping vs VSUPPLY Burst Mode Operation
0.3 700 120 VREF SET TO MAX 0.2 600 ALL 3 100 ALL 3 500 0.1 80 2 BUCKS ENABLED 2 BUCKS ENABLED 400 0.0 (µA) (µA) 60 ERROR (%) 1 BUCK ENABLED I SVIN 300 1 BUCK ENABLED I SVIN V FB –0.1 40 200 –0.2 VFB1 20 V 100 FB2 VFB3 NO LOAD NO LOAD –0.3 0 0 –50 0 50 100 150 2 3 4 5 6 2 3 4 5 6 TEMPERATURE (°C) VSUPPLY (V) VSUPPLY (V) 3569 G10 3569 G11 3569 G12 3569fe For more information www.linear.com/LTC3569 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts