Datasheet LTC3541 (Analog Devices) - 3

LTC3541
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPK Peak Inductor Current VIN = 4.2V (Note 8) 0.8 0.95 1.25 A IBUCKFB BUCKFB Pin Input Current VBUCKFB = 0.9V l ±50 nA ILFB LFB Pin Input Current VLFB = 0.45V l –200 –40 nA VIN Input Voltage Range (Note 4) l 2.7 5.5 V VIN(LINEREG) Buck VIN Line Regulation VIN = 2.7V to 5.5V, ENBUCK = VIN, l 0.04 0.4 %/V ENVLDO = 0V, MODE = VIN (Note 6) VLDO VIN Line Regulation VIN = 2.7V to 5.5V, LVOUT = 1.2V, ENBUCK = VIN, 0.6 mV/V (Referred to LFB) ENVLDO = VIN, IOUT(VLDO) = 100mA, LVIN = 1.5V Linear Regulator VIN Line VIN = 2.7V to 5.5V, LVOUT = 1.2V, ENBUCK = 0V, 0.6 mV/V Regulation (Referred to LFB) ENVLDO = VIN, IOUT(LREG) = 10mA LVIN(LINEREG) LVIN Line Regulation LVIN = 0.9V to 5.5V, VIN = 5.5V, LVOUT = 0.4V, 0.3 mV/V (Referred to LFB) ENBUCK = VIN, ENVLDO = VIN, MODE = VIN, IOUT(VLDO) = 100mA VLDODO LVIN – LVOUT Dropout Voltage LVIN = 1.5V, ENBUCK = VIN, ENVLDO = VIN, 28 60 mV (Note 9) MODE = VIN, IOUT(VLDO) = 50mA, VLFB = 0.3V VLOADREG Buck Output Load Regulation ENBUCK = VIN, ENVLDO = 0V, MODE = VIN (Note 6) 0.5 % VLDO Output Load Regulation IOUT(VLDO) = 1mA – 300mA, LVIN = 1.5V, LVOUT = l 0.25 0.5 % 1.2V, ENBUCK = VIN, ENVLDO = VIN, MODE = VIN Linear Regulator Output Load IOUT(LREG) = 1mA – 30mA, LVOUT = 1.2V, l 0.25 0.5 % ENBUCK = 0V, ENVLDO = VIN VBUCKFB Reference Regulation Voltage ENBUCK = VIN, ENVLDO = 0V, TA = 25°C 0.784 0.8 0.816 V (Note 6) ENBUCK = VIN, ENVLDO = 0V, 0°C ≤ TA ≤ 85°C 0.782 0.8 0.818 V ENBUCK = VIN, ENVLDO = 0V, –40°C ≤ TA ≤ 85°C l 0.78 0.8 0.82 V VLFB Reference Regulation Voltage ENBUCK = 0V, ENVLDO = VIN, TA = 25°C 0.392 0.4 0.408 V (Note 7) ENBUCK = 0V, ENVLDO = VIN, 0°C ≤ TA ≤ 85°C 0.391 0.4 0.409 V ENBUCK = 0V, ENVLDO = VIN, –40°C ≤ TA ≤ 85°C l 0.390 0.4 0.410 V IS Buck + VLDO LVIN = 1.5V, LVOUT = 1.2V, ENBUCK = VIN, 85 μA Burst Mode Sleep ENVLDO = VIN, MODE = 0V, IOUT(VLDO) = 10μA, VIN Quiescent Current VBUCKFB = 0.9V Buck + VLDO LVIN = 1.5V, LVOUT = 1.2V, ENBUCK = VIN, 315 μA Burst Mode Active ENVLDO = VIN, MODE = 0V, IOUT(VLDO) = 10μA, VIN Quiescent Current VBUCKFB = 0.7V Buck + VLDO LVIN = 1.5V, LVOUT = 1.2V, ENBUCK = VIN, 300 μA Pulse-Skip Mode Active ENVLDO = VIN, MODE = VIN, IOUT(VLDO) = 10μA, VIN Quiescent Current VBUCKFB = 0.7V Buck VBUCKFB = 0.9V, IOUT(BUCK) = 0A, ENBUCK = VIN, 55 μA Burst Mode Sleep ENVLDO = 0V, MODE = 0V VIN Quiescent Current Buck VBUCKFB = 0.7V, IOUT(BUCK) = 0A, ENBUCK = VIN, 300 μA Burst Mode Active ENVLDO = 0V, MODE = 0V VIN Quiscent Current Buck VBUCKFB = 0.7V, IOUT(BUCK) = 0A, ENBUCK = VIN, 285 μA Pulse-Skip Mode Active ENVLDO = 0V, MODE = VIN VIN Quiescent Current Linear Regulator VIN Quiescent LVOUT = 1.2V, ENBUCK = 0V, ENVLDO = VIN, 50 μA Current IOUT(LREG) = 10μA VIN Shutdown Quiescent Current ENBUCK = 0V, ENVLDO = 0V 2.5 μA LVIN Shutdown Quiescent Current LVIN = 3.6V, ENBUCK = 0V, ENVLDO = 0V 0.1 μA 3541fb For more information www.linear.com/LTC3541 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information BUCK Regulator VLDO/Linear regulator Applications Information Efficiency Considerations Thermal Considerations Applications Information Pc Board Layout Checklist Design Example Typical Applications Package Description Revision History Related Parts