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LTC3544 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3544 Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page LTC3544 4 3544fa 2 μs/DIV VOUT300 50mV/DIV AC COUPLED IL 100mA/DIV SW300 5V/DIV 3544 G04 VIN = 3.6V VOUT = 1.8V TA = 25°C ILOAD = 20mA Burst Mode Operation 300mA Channel Burst Mode Operation 200mA, A-B Channels Burst Mode Operation 100mA Channel VREF vs Temperature at 2.25V, 3.6V, 5.5V Switching Frequency vs Supply Voltage and Temperature Efficiency vs Load Current 300mA Channel. All Other Channels at 50% Peak Current TEMPERATURE ( °C) –50 0.785 0.790 0.795 0.800 0805 0.810 0.815 0 50 100 3544 G01 VIN = 2.25V VIN = 3.6V VIN = 5.5V CHANNEL 200A ILOAD = 100mA ALL CHANNELS OPERATING SUPPLY VOLTAGE (V) 2 1.5 2.0 2.5 3.0 34 3544 G02 56 fOSC –40°C fOSC 0°C fOSC 25°C fOSC 80°C ILOAD CHANNEL 100 = 50mA ALL CHANNELS OPERATING LOAD CURRENT 300mA CHANNEL (A) 30 90 100 20 10 80 50 70 60 40 0.0001 0.01 0.1 1 3544B G03 0 0.001 VIN = 3.6V TA = 25°C VOUT100 = 1.2V VOUT200A = 0.8V VOUT200B = 1.5V VOUT300 = 1.8V ALL OTHER CHANNELS LOADED 50% 2 μs/DIV VOUT200B 50mV/DIV AC COUPLED IL 50mA/DIV SW2B 5V/DIV 3544 G05 VIN = 3.6V VOUT = 1.5V TA = 25°C ILOAD = 15mA 2 μs/DIV VOUT100 50mV/DIV AC COUPLED IL 50mA/DIV SW100 5V/DIV 3544 G06 VIN = 3.6V VOUT = 1.2V TA = 25°C ILOAD = 12mA TYPICAL PERFORMANCE CHARACTERISTICS Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD)(68°C/W). Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 5: The LTC3544 is tested in a proprietary test mode that connects VFB to the output of the error amplifier. Note 6: Load regulation is inferred by measuring the regulation loop gain. Note 7: The QFN switch on-resistance is guaranteed by correlation to wafer level measurements. Note 8: Guaranteed by long-term current density limitations. ELECTRICAL CHARACTERISTICS |
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