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LTC1649 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1649 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LTC1649 Note 1: Absolute Maximum Ratings are those values beyond which the life of a part may be impaired. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 3: Maximum Duty Cycle limitations will limit the output voltage obtainable at very low supply voltages. Note 4: Supply current at PVCC1 and PVCC2 is dominated by the current needed to charge and discharge the external MOSFET gates. This current will vary with the operating voltage and the external MOSFETs used. Note 5: Under normal operating conditions, the charge pump will skip cycles to maintain regulation and the apparent frequency will be lower than 700kHz. Note 6: The ILIM amplifier can sink but not source current. Under normal (not current limited) operation, the ILIM output current will be zero. Note 7: Driver rise and fall times are measured from 10% to 90%. TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE ( °C) –40 210 220 240 20 60 1649 G02 200 190 –20 0 40 80 100 180 170 230 VCC = 5V Oscillator Frequency vs Temperature TEMPERATURE ( °C) –40 12.5 13.0 14.0 20 60 1649 G01 12.0 11.5 –20 0 40 80 100 11.0 10.5 13.5 VCC = 5V IMAX Pin Current vs Temperature TEMPERATURE ( °C) –40 70 75 85 90 95 0 40 60 1649 G03 80 –20 20 80 100 100 VCOMP = VCC VFB = 1.265V VCC = 5V Maximum Duty Cycle vs Temperature Error Amplifier Transconductance vs Temperature TEMPERATURE ( °C) –40 350 400 500 550 600 850 700 0 40 60 100 1649 G04 450 750 800 650 –20 20 80 gm = ∆ICOMP ∆VFB VCC = 5V Output Voltage vs Load Current with Current Limit LOAD CURRENT (A) 0 1.5 2.0 2.5 6 10 1649 G07 1.0 0.5 0 24 8 3.0 3.5 4.0 12 TA = 25°C VCC = 5V FIGURE 1 RIMAX = 16k RIMAX = 33k Load Regulation LOAD CURRENT (A) 0 –1.0 – 0.8 – 0.4 – 0.2 0 0.4 1 5 7 1649 G06 – 0.6 0.2 4 9 10 2 3 68 TA = 25°C VOUT = 3.3V VCC = 5V FIGURE 1 ELECTRICAL CHARACTERISTICS |
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