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TPS76201DBVRG4 データシート(PDF) 9 Page - Texas Instruments |
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TPS76201DBVRG4 データシート(HTML) 9 Page - Texas Instruments |
9 / 16 page TPS76201 LOW OUTPUT ADJUSTABLE ULTRALOW POWER 100mA LDO LINEAR REGULATOR SLVS323B − FEBRUARY 2001 − REVISED JANUARY 2007 9 APPLICATION INFORMATION power dissipation and junction temperature Specified regulator operation is assured to a junction temperature of 125 °C; the maximum junction temperature should be restricted to 125 °C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum-power-dissipation limit is determined using the following equation: P D(max) + T J max * T A RqJA Where: TJmax is the maximum allowable junction temperature. RθJA is the thermal resistance junction-to-ambient for the package, see the dissipation rating table. TA is the ambient temperature. The regulator dissipation is calculated using: P D + V I * V O I O Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the thermal protection circuit. regulator protection The TPS76201 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. The TPS76201 features internal current limiting and thermal protection. During normal operation, the TPS76201 limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds approximately 165 °C, thermal-protection circuitry shuts it down. Once the device has cooled down to below approximately 140 °C, regulator operation resumes. www.ti.com |
同様の部品番号 - TPS76201DBVRG4 |
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同様の説明 - TPS76201DBVRG4 |
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