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TPS72118 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS72118 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 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) PROGRAMMING THE TPS72101 ADJUSTABLE LDO REGULATOR V O + V ref 1 ) R1 R2 (3) TPS72101 ,, TPS72115 TPS72116, TPS72118 SLVS352C – DECEMBER 2001 – REVISED MARCH 2006 APPLICATION INFORMATION (continued) Figure 19. 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 assured 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 output voltage of the TPS72101 adjustable regulator is programmed using an external resistor divider as shown in Figure 20. The output voltage is calculated using Equation 3: Where: • V ref = 1.225 V typ (the internal reference voltage) 8 Submit Documentation Feedback |
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