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LTC3703EG Datasheet(PDF) 3 Page - Linear Technology |
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LTC3703EG Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3703 3 3703f Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3703E 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 formula: LTC3703: TJ = TA + (PD • 100 °C/W) G Package Note 4: The LTC3703 is tested in a feedback loop that servos VFB to the reference voltage with the COMP pin forced to a voltage between 1V and 2V. ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = DRVCC = VBOOST = VIN = 10V, VMODE/SYNC = VINV = VSW = BGRTN = 0V, RUN/SS = IMAX = open, RSET = 25k, unless otherwise specified. Note 5: The dynamic input supply current is higher due to the power MOSFET gate charging being delivered at the switching frequency (QG • fOSC). Note 6: Guaranteed by design. Not subject to test. Note 7: 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. Note 8: RDS(ON) guaranteed by correlation to wafer level measurement. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop VFB Feedback Voltage (Note 4) 0.792 0.800 0.808 V q 0.788 0.812 V ∆VFB, LINE Feedback Voltage Line Regulation 9V < VCC < 15V (Note 4) q 0.007 0.05 %/V ∆VFB, LOAD Feedback Voltage Load Regulation 1V < VCOMP < 2V (Note 4) q 0.01 0.1 % VMODE/SYNC MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.8 0.87 V ∆V MODE/SYNC MODE/SYNC Hysteresis 20 mV IMODE/SYNC MODE/SYNC Current 0 ≤ VMODE/SYNC ≤ 15V 0 1 µA VINV Invert Threshold 1 1.5 2 V IINV Invert Current 0 ≤ VINV ≤ 15V 0 1 µA IVIN VIN Sense Input Current VIN = 100V 100 140 µA RUN/SS = 0V, VIN = 10V 0 1 µA IMAX IMAX Source Current VIMAX = 0V 10.5 12 13.5 µA VOS, IMAX VIMAX Offset Voltage |VSW| – VIMAX at IRUN/SS = 0µA – 25 10 55 mV VRUN/SS Shutdown Threshold 0.7 0.9 1.2 V IRUN/SS RUN/SS Source Current RUN/SS = 0V 2.5 4 5.5 µA Maximum RUN/SS Sink Current |VSW| – VIMAX > 100mV 9 17 25 µA VUV Undervoltage Lockout VCC Rising q 8.0 8.7 9.3 V VCC Falling q 5.7 6.2 6.8 V Oscillator fOSC Oscillator Frequency RSET = 25kΩ 270 300 330 kHz fSYNC External Sync Frequency Range 100 600 kHz tON, MIN Minimum On-Time 200 ns DCMAX Maximum Duty Cycle f < 200kHz 89 93 96 % Driver IBG, PEAK BG Driver Peak Source Current 1.5 2 A RBG, SINK BG Driver Pull-Down RDS, ON (Note 8) 1 1.5 Ω ITG, PEAK TG Driver Peak Source Current 1.5 2 A RTG, SINK TG Driver Pull-Down RDS, ON (Note 8) 1 1.5 Ω Feedback Amplifier AVOL Op Amp DC Open Loop Gain (Note 4) 74 85 dB fU Op Amp Unity Gain Crossover Frequency (Note 6) 25 MHz IFB FB Input Current 0 ≤ VFB ≤ 3V 0 1 µA ICOMP COMP Sink/Source Current ±5 ±10 mA |
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