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LTC1705 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1705 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LTC1705 3 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, VINCLK = 3.3V unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AFB Feedback Amplifier DC Gain q 74 85 dB GBW Feedback Amplifier Gain Bandwidth Product f = 100kHz (Note 7) 20 MHz ICOMP Feedback Amplifier Output Sink/Source Current q ±3 ±10 mA VPGOOD Negative Power Good Threshold Relative to Nominal Output Voltage q –15 –10 – 6 % Positive Power Good Threshold q 610 15 % AILIM Current Limit Amplifier DC Gain q 40 60 dB IIMAX IMAX Source Current VIMAXC = VIMAXIO = 0V q –12 –10 – 8 µA Core, I/O Supply Switching Characteristics fOSC Oscillator Frequency Test Circuit 1 q 460 550 650 kHz ΦOSC Core and I/O Oscillator Phase Difference (Note 7) 180 DEG DCMAX Maximum Duty Cycle q 87 90 93 % tNOV Driver Nonoverlap Test Circuit 1, 50% to 50% q 10 25 120 ns tr, tf Driver Rise/Fall Time Test Circuit 1, 10% to 90% q 15 100 ns Clock Supply Output VOUTCLK CLK Output Voltage IVOUTCLK = 0mA q 2.45 2.50 2.55 V dVOUTCLK Output Voltage Line Regulation VINCLK = 3.0V to 5.5V q ±0.02 ±0.1 %/V Output Voltage Load Regulation IVOUTCLK = 0mA to 150mA q – 0.1 – 0.05 % ILMCLK CLK Output Short-Circuit Current IVOUTCLK = 0V q – 240 –150 mA VDROPOUT CLK Output Dropout Voltage IVOUTCLK = 150mA, dVOUTCLK = –1% (Note 8) q 0.3 0.5 V VPGOOD Negative VOUTCLK Power Good Threshold Relative to VOUTCLK q –15 –10 – 6 % Positive VOUTCLK Power Good Threshold Relative to VOUTCLK q 610 15 % VID Inputs R1 Resistance Across SENSEC and FBC 10 k Ω RVID VID Input Pull-Up Resistance (Note 9) 30 k Ω VVID VID Input Threshold q 0.4 1.6 V PGOOD IPGOOD VPGOOD Sink Current Power Good q 10 µA Power Bad q 10 mA VOLPG PGOOD Output Low Voltage IPGOOD = 1mA q 0.03 0.1 V TPGOOD VPGOOD Falling Edge Delay q 248 µs VPGOOD Rising Edge Delay q 10 20 40 µs VPBAD Pulse VID Code Change q 10 20 40 µs Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1705 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 capacitance of the external MOSFET gates. This current varies with supply voltage and the choice of external MOSFETs. Note 6: Supply current in shutdown is dominated by external MOSFET leakage and may be significantly higher than the quiescent current drawn by the LTC1705, especially at elevated temperature. Note 7: Guaranteed by design, not subject to test. Note 8: Dropout voltage is the minimum input-to-output voltage differential required to maintain regulation at the specified output current. In dropout, the output voltage will be equal to VINCLK – VDROPOUT. Note 9: Each internal pull-up resistor attached to the VID inputs has a series diode connected to VCC to allow input voltages higher than the VCC supply without damage or clamping. (See Block Diagram.) Note 10: The core feedback voltage accuracy is guaranteed by the VSENSE output voltage accuracy test. |
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