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LTC1439 数据表(PDF) 4 Page - Linear Technology |
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LTC1439 数据表(HTML) 4 Page - Linear Technology |
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4 / 32 page  LTC1438/LTC1439 4 14389fb The ● denotes the specifications which apply over the full operating temperature range. TA = 25°C, VIN = 15V, VRUN/SS1,2 = 5V unless otherwise noted. ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1438CG, LTC1439CG: TJ = TA + (PD)(95°C/W) LTC1439CGW: TJ = TA + (PD)(85°C/W) Note 3: The LTC1438 and LTC1439 are tested in a feedback loop which servos VOSENSE1,2 to the balance point for the error amplifier (VITH1,2 = 1.19V). Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 5: Oscillator frequency is tested by measuring the COSC charge and discharge current (IOSC) and applying the formula: fOSC (kHz) = 8.4(108)[COSC (pF) + 11]–1 (1/ICHG + 1/IDISC) –1 Note 6: The auxiliary regulator is tested in a feedback loop which servos VAUXFB to the balance point for the error amplifier. For applications with VAUXDR > 9.5V, VAUXFB uses an internal resistive divider. See Applications Information section. Note 7: The LTC1439EG 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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Low-Battery Comparator VSATLBO LBO Saturation Voltage ILBO = 1.6mA, VLBI = 1.1V 0.6 1 V ILLBO LBO Leakage VLBO = 12V, VLBI = 1.4V ● 0.01 1 µA VTHLB1 LBI Trip Voltage High to Low Transition on LBO ● 1.16 1.19 1.22 V IINLB1 LBI Input Current VLBI = 1.19V ● 150 nA VHYSLBO LBO Hysteresis 20 mV Auxiliary Regulator/Comparator IAUXDR AUXDR Current VEXTVCC = 0V Max Current Sinking Capability VAUXDR = 4V, VAUXFB = 1.0V, VAUXON = 5V 10 15 mA Control Current VAUXDR = 5V, VAUXFB = 1.5V, VAUXON = 5V 1 5 µA Leakage when OFF VAUXDR = 24V, VAUXFB = 1.5V, VAUXON = 0V 0.01 1 µA IINAUXFB AUXFB Input Current VAUXFB = 1.19V, VAUXON = 5V 0.01 1 µA IINAUXON AUXON Input Current VAUXON = 5V 0.01 1 µA VTHAUXON AUXON Trip Voltage VAUXDR = 4V, VAUXFB = 1V 1.0 1.19 1.4 V VSATAUXDR AUXDR Saturation Voltage IAUXDR = 1.6mA, VAUXFB = 1V, VAUXON = 5V 0.4 0.8 V VAUXFB AUXFB Voltage VAUXON = 5V, 11V < VAUXDR < 24V (Note 6) ● 11.5 12.0 12.5 V VAUXON = 5V, 3V < VAUXDR < 7V ● 1.14 1.19 1.24 V VTHAUXDR AUXFB Divider Disconnect Voltage VAUXON = 5V (Note 6); Ramping Negative 7.5 8.5 9.5 V |
类似零件编号 - LTC1439_15 |
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类似说明 - LTC1439_15 |
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