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TPS72118MDBVREP Datasheet(PDF) 8 Page - Texas Instruments |
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TPS72118MDBVREP Datasheet(HTML) 8 Page - Texas Instruments |
8 / 14 page www.ti.com TPS72115 1.8 V 1.5 V Boost Converter 3.3 V 1.8 V – 3 V VIO VCORE DSP or Controller Two AAA Batteries EXTERNAL CAPACITOR REQUIREMENTS POWER DISSIPATION AND JUNCTION TEMPERATURE P D(max) + T J max * TA R q JA (1) P D + V I * V O I O (2) REGULATOR PROTECTION TPS72118-EP SGDS037A – OCTOBER 2007 – REVISED DECEMBER 2007 Figure 18. Dual Supply Application Circuit A 0.1- µF ceramic bypass capacitor is required on both the input and output for stability. Larger capacitors improve transient response, noise rejection, and ripple rejection. A higher value electrolytic input capacitor may be necessary if large, fast rise time load transient are anticipated, and/or there is significant input resistance from the device to the input power supply. Specified regulator operation is ensured to a junction temperature of 125 °C; the maximum junction temperature allowable without damaging the device is 150 °C. 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 Equation 1 : Where: • T Jmax is the maximum allowable junction temperature. • Rθ JA is the thermal resistance junction-to-ambient for the package; see the package dissipation rating table. • T A is the ambient temperature. The regulator dissipation is calculated using Equation 2: Power dissipation resulting from quiescent current is negligible. The TPS72118 pass element has a built-in back diode that safely conducts reverse current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be appropriate. The TPS72118 also features internal current limiting and thermal protection. During normal operation, the TPS72118 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 170 °C, thermal-protection circuitry shuts it down. Once the device has cooled down to below 150 °C, regulator operation resumes. 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPS72118-EP |
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