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LTC1704EGN Datasheet(PDF) 3 Page - Linear Technology |
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LTC1704EGN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LTC1704/LTC1704B 3 1704bfa ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = PVCC = BOOST = 5V, unless otherwise specified. (Note 3) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1704E 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: 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 4: PVCC and BVCC (VBOOST – VSW) must be greater than VGS(ON) of the external MOSFETs to ensure proper operation. Note 5: Supply current in normal operation is dominated by the current needed to charge and discharge the external MOSFET gates. This current will vary with supply voltage and the external MOSFETs used. Note 6: Supply current in shutdown is dominated by external MOSFET leakage and may be significantly higher than the quiescent current drawn by the LTC1704, especially at elevated temperature. Note 7: Guaranteed by design, not subject to test. Note 8: Rise and fall times are measured using 10% and 90% levels. Delay and nonoverlap times are measured using 50% levels. Note 9: Dropout voltage is the minimum VCC to VREGDR voltage differential required to maintain regulation at the specified driver output current. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switcher Switching Characteristics fOSC Oscillator Frequency Test Circuit q 460 550 650 kHz DCMAX Maximum Duty Cycle q 87 90 93 % tNOV Driver Nonoverlap Test Circuit (Note 8) q 10 25 120 ns tr, tf Driver Rise/Fall Time Test Circuit (Note 8) q 15 100 ns Linear Regulator Controller VREGFB Feedback Voltage Test Circuit, RREGILM = 680k 0.784 0.800 0.816 V q 0.780 0.800 0.820 V IREGFB REGFB Input Current q ±1 µA dVREGFB Feedback Voltage Line Regulation Test Circuit, VCC = 4.5V to 5.5V q ±0.05 ±0.2 %/V Feedback Voltage Load Regulation Test Circuit, IREGDR = 0mA to 30mA q –0.2 –0.05 % IREGDR Driver Output Current Test Circuit q 30 mA RREGILM = 680k, VREGFB = 0.76V, VREGDR = 3.3V 20 mA RREGILM = 680k, VREGFB = 0V, VREGDR = 1V 6 mA VDROPOUT Driver Dropout Voltage Test Circuit, IREGDR = 30mA, VREGDR = 3.3V, q 0.65 1.1 V dVREGFB = –1% (Note 9) VREGILM REGILM Threshold Test Circuit, RREGILM = 680k 0.8 V IREGILMINT REGILM Internal Pull-Up Current VREGILM = 0V –1.9 µA VPGOOD Negative REGFB Power Good Threshold q –15 –10 –6 % Positive REGFB Power Good Threshold q 610 15 % PGOOD IPGOOD VPGOOD Sink Current Power Good q 10 µA Power Bad q 10 mA VOLPG VPGOOD Output Low Voltage IPGOOD = 1mA q 0.03 0.1 V tPGOOD VPGOOD Falling Edge Delay (Note 8) q 0.5 1 4 µs VPGOOD Rising Edge Delay (Note 8) q 10 20 40 µs |
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