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LTC1879EGN Datasheet(PDF) 3 Page - Linear Technology |
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LTC1879EGN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 20 page  3 LTC1879 1879f The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 5V unless otherwise noted. ELECTRICAL CHARACTERISTICS VRUN RUN Threshold VRUN Ramping Up q 0.2 0.7 1.5 V IRUN RUN Input Current VRUN = 0V ±0.01 ±1 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1879E is guaranteed to meet specified performance from 0 °C to 70°C. Specifications over the –40°C to 85°C operating ambient temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: LTC1879: TJ = TA + (PD × 140°C/W) Note 4: The LTC1879 is tested in a feedback loop which servos VFB to the balance point for the error amplifier (VITH = 1.2V) Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 6: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125 °C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. RDS(ON) vs Temperature Oscillator Frequency vs Temperature Oscillator Frequency vs Supply Voltage TYPICAL PERFOR A CE CHARACTERISTICS DC Supply Current vs Temperature SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RDS(ON) vs Input Voltage TEMPERATURE ( °C) –50 –25 0 25 50 75 100 125 1879 G01 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VIN = 5V VIN = 5V VIN = 10V VIN = 10V SYNCHRONOUS SWITCH MAIN SWITCH TEMPERATURE ( °C) –50 –25 0 25 50 75 100 125 1879 G02 595 575 555 535 515 495 VIN = 5V SUPPLY VOLTAGE (V) 2 4 68 10 1879 G03 600 590 580 570 560 550 540 530 520 510 500 TEMPERATURE ( °C) –50 0 50 100 125 1879 G04 300 250 200 150 100 50 0 PULSE SKIPPING MODE Burst Mode OPERATON VIN = 5V DC Supply Current vs Input Voltage INPUT VOLTAGE (V) 0 0 50 100 150 200 250 300 246 8 1879 G05 10 PULSE SKIPPING MODE Burst Mode OPERATION INPUT VOLTAGE (V) 2 0 0.1 0.2 0.3 0.4 46 8 10 1879 G06 0.5 0.6 35 7 9 SYNCHRONOUS SWITCH MAIN SWITCH |
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