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LTC1876 데이터시트(PDF) 4 Page - Linear Technology |
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LTC1876 데이터시트(HTML) 4 Page - Linear Technology |
4 / 36 page LTC1876 4 1876fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 3.3V Linear Regulator V3.3OUT 3.3V Regulator Output Voltage No Load q 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V 0.05 0.2 % PGOOD Output VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative –6 –7.5 –9.5 % VOSENSE Ramping Positive 6 7.5 9.5 % Aux Output AUXVINMIN AUX Minimum Operating Voltage q 2.4 2.6 V AUXVFB AUX Regulated Feedback Voltage q 1.23 1.26 1.28 V AUXIFB AUX Feedback Pin Bias Current q 120 360 nA AUXIQ AUX Input DC Supply Current Normal Mode VAUXSD = 2.4V, Not Switching 4 mA Shutdown VAUXSD = 0V 0.01 1 µA AUXVLINEREG AUX Line Regulation 2.6V ≤ AUXVIN ≤ 16V 0.01 0.05 %/V AUXfOSC AUX Oscillator Frequency q 0.8 1.2 1.6 MHz AUXDCMAX AUX Oscillator Maximum Duty Cycle q 84 86 % AUXILIMIT AUX Switch Current Limit (Note 9) 1 1.4 2 A AUXVCESAT AUX Switch Saturation Voltage ISW = 900mA (Note 10) 330 550 mV AUXILEAKAGE AUX Switch Leakage Current VSW = 5V 0.01 1 µA AUXVAUXSD AUX Shutdown Input Voltage AUX Shutdown Upper Trip Point 2.4 V AUX Shutdown Lower Trip Point 0.5 V IAUXSD AUXSD Pin Bias Current VAUXSD = 3V 16 32 µA VAUXSD = 0V 0.01 0.1 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1876E 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: LTC1876EG: TJ = TA + (PD • 95°C/W) Note 4: The LTC1876 is tested in a feedback loop that servos VITH1, 2 to a specified voltage and measures the resultant VOSENSE1, 2. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 6: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 7: The minimum on-time condition is specified for an inductor peak- to-peak ripple current ≥40% of IMAX (see Minimum On-Time Considerations in the Applications Information section). Note 8: VFREQSET pin internally tied to 1.19V reference through a large resistance. Note 9: Current limit guaranteed by design and/or correlation to static test. Note 10: 100% tested at wafer level. ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted. |
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