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LTC1878 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1878 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LTC1878 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1878E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating 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 formulas: LTC1878EMS8: TJ = TA + (PD)(150°C/W) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IPK Peak Inductor Current VIN = 3.3V, VFB = 0.7V, Duty Cycle < 35% 0.8 1.0 1.25 A ILSW SW Leakage VRUN = 0V, VSW = 0V or 6V, VIN = 6V ±0.01 ±1 µA VSYNC/MODE SYNC/MODE Threshold VSYNC/MODE Rising q 0.3 1.0 1.5 V ISYNC/MODE SYNC/MODE Leakage Current ±0.01 ±1 µA VRUN RUN Threshold VRUN Rising q 0.3 0.7 1.5 V IRUN RUN Input Current ±0.01 ±1 µA The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN=3.6Vunlessotherwisespecified. Note 4: The LTC1878 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. ELECTRICAL CHARACTERISTICS TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage INPUT VOLTAGE (V) 2 75 80 85 5 7 1878 G01 70 65 60 34 6 90 95 100 8 Burst Mode OPERATION VOUT = 2.5V L = 10 µH ILOAD = 100mA ILOAD = 10mA ILOAD = 1mA ILOAD = 300mA ILOAD = 0.1mA OUTPUT CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 1878 G02 0 1 VIN = 3.6V VIN = 3.6V VIN = 4.2V VIN = 4.2V PULSE SKIPPING MODE Burst Mode OPERATION VOUT = 1.8V L = 10 µH OUTPUT CURRENT (mA) 60 70 75 85 95 0.1 10 100 1000 1878 G03 50 1 80 65 55 90 L = 15 µH L = 10 µH Burst Mode OPERATION VIN = 6V VOUT = 2.5V Efficiency vs Output Current Efficiency vs Output Current |
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