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LTC1148L 数据表(PDF) 4 Page - Linear Technology |
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LTC1148L 数据表(HTML) 4 Page - Linear Technology |
4 / 20 page 4 LTC1148 LTC1148-3.3/LTC1148-5 ELECTRICAL C C HARA TERISTICS The q denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1148CN, LTC1148CN-3.3, LTC1148CN-5: TJ = TA + (PD × 70°C/W) LTC1148CS, LTC1148CS-3.3, LTC1148CS-5: TJ = TA + (PD × 110°C/W) Note 3: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 4: The LTC1148 and LTC1148HV versions are tested with external feedback resistors resulting in a nominal output voltage of 5V. The LTC1148L version is tested with external feedback resistors resulting in a nominal output voltage of 2.5V. Note 5: In applications where RSENSE is placed at ground potential, the off time increases approximately 40%. Note 6: The LTC1148, LTC1148HV and LTC1148L series are not tested and not quality assurance sampled at –40 °C and 85°C. These specifications are guaranteed by design and/or correlation. Note 7: The LTC1148L and LTC1148L-3.3 allow operation to VIN = 3.5V. CC HARA TERISTICS A TYPICALPERFOR CE Line Regulation Efficiency vs Input Voltage LOAD CURRENT (A) 0 –100 –80 –60 –40 –20 0 20 0.5 1 1.5 2 LTC1148 • TPC03 2.5 FIGURE 1 CIRCUIT RSENSE = 0.05Ω VIN = 6V VIN = 12V INPUT VOLTAGE (V) 0 80 82 86 88 90 100 94 4 8 LTC1148 • TPC01 84 96 98 92 12 16 20 ILOAD = 100mA FIGURE 1 CIRCUIT ILOAD = 1A DC Supply Current Supply Current in Shutdown Load Regulation Operating Frequency vs (VIN – VOUT) (VIN – VOUT) VOLTAGE (V) 0 0.6 1.0 8 LTC1148 • TPC06 0.4 0 2 4 6 0.2 1.2 0.8 10 12 1.4 1.6 VOUT = 5V 0°C 70°C 25°C INPUT VOLTAGE 0 0 0.3 0.9 1.2 1.5 4 LTC1148 • TPC04 0.6 26 1.8 2.1 8 10 12 14 16 18 SLEEP MODE ACTIVE MODE NOT INCLUDING GATE CHARGE CURRENT 20 INPUT VOLTAGE (V) 0 0 2 6 8 10 20 14 4 8 10 18 LTC1148 • TPC05 4 16 18 12 26 12 14 16 VSHUTDOWN = 2V 20 INPUT VOLTAGE (V) 0 0 10 20 16 LTC1148 • TPC02 –10 –20 –40 4 812 –30 40 30 FIGURE 1 CIRCUIT ILOAD = 1A 20 |
类似零件编号 - LTC1148L |
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类似说明 - LTC1148L |
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