SLVSAF7C September 2010 – April 2019 TPS61251
The output voltage can be calculated using Equation 4.
To minimize the current through the feedback divider network and therefore increase efficiency during snooze mode operation, R2 must be > 240 k. To keep the network robust against noise the resistor divider can also be in the lower 100-k values. In this case, R1 is 1000 kΩ and R2 is 280 kΩ.
An external feed forward capacitor C1 is required for optimum load transient response. The value of C1 must be 1000 pF. The connection from FB pin to the resistor divider should be kept short and away from noise sources, such as the inductor or the SW line.