Datasheet LTC3569 (Analog Devices) - 6

LTC3569
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Buck1 Load Regulation Buck2 Load Regulation
0.6 0.6 BUCK2, 3 OFF BUCK1, 3 OFF 0.4 0.4 VIN = 5.5V VIN = 5.5V 0.2 VIN = 4.5V 0.2 VIN = 4.5V PULSE-SKIPPING PULSE-SKIPPING 0.0 0.0 ERROR (%) ERROR (%) V OUT –0.2 VIN = 2.5V V V OUT –0.2 IN = 3.5V VIN = 2.5V VIN = 3.5V –0.4 –0.4 –0.6 –0.6 0 0.2 0.4 0.6 0.8 1 1.2 0 0.1 0.2 0.3 0.4 0.5 0.6 ILOAD (A) ILOAD (A) 3569 G13 3569 G14
Buck3 Load Regulation Line Regulation
0.6 0.15 BUCK1, 2 OFF EACH BUCK TESTED INDIVIDUALLY 0.4 0.10 BUCK2 = 1.2V 0.2 0.05 BUCK1 = 1.8V 0.0 0.00 ERROR (%) ERROR (%) PULSE-SKIPPING V OUT –0.2 V OUT BUCK3 = 1.5V –0.05 –0.4 –0.10 PULSE-SKIPPING MODE ILOAD1 = 200mA VOUT3 = 1.5V ILOAD2, 3 = 150mA –0.6 –0.15 0 0.1 0.2 0.3 0.4 0.5 0.6 2 3 4 5 6 ILOAD (A) VSUPPLY (V) 3569 G15 3569 G16
FB Pin Leakage IQSD vs Temperature
1000 10000 VIN = 5.5V SLAVE VIN = 5.5V 100 DETECTOR = 250nA 1000 10 100 (nA) 1 I (nA) FB2,3 I FB I SVIN 10 0.1 IFB1 1 0.01 0.001 0.1 0 1 2 3 4 5 6 –50 0 50 100 150 VFB (V) TEMPERATURE (°C) 3569 G17 3569 G18 3569fe 6 For more information www.linear.com/LTC3569 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