SBVS233B January 2016 – June 2021 TPS7A84
The TPS7A84 can be used either with the internal ANY-OUT network or by using external resistors. Using the ANY-OUT network allows the TPS7A84 to be programmed from 0.8 V to 3.95 V. To extend this output voltage range to 5.0 V, external resistors must be used. This configuration is referred to as the adjustable configuration of the TPS7A84 throughout this document. Regardless whether the internal resistor network or whether external resistors are used, the output voltage is set by two resistors, as shown in Figure 8-4. Using the internal resistor ensures a 1% accuracy and minimizes the number of external components.
R1 and R2 can be calculated for any output voltage range using Equation 8. This resistive network must provide a current equal to or greater than 5 μA for dc accuracy. Using an R1 of 12.1 kΩ is recommended to optimize the noise and PSRR.
Table 8-5 shows the resistor combinations required to achieve several common rails using standard 1%-tolerance resistors.
|TARGETED OUTPUT VOLTAGE|
|FEEDBACK RESISTOR VALUES||CALCULATED OUTPUT VOLTAGE |
|R1 (kΩ)||R2 (kΩ)|