SBVS338E March 2020 – December 2021 TPS7A20
The load-step transient response is the output voltage response by the LDO to a step in load current, whereby output voltage regulation is maintained. There are two key transitions during a load transient response: the transition from a light to a heavy load and the transition from a heavy to a light load. The regions shown in Figure 8-1 are broken down as follows. Regions A, E, and H are where the output voltage is in steady-state.
During transitions from a light load to a heavy load, the:
During transitions from a heavy load to a light load, the:
A larger output capacitance reduces the peaks during a load transient but slows down the response time of the device. A larger DC load also reduces the peaks because the amplitude of the transition is lowered and a higher current discharge path is provided for the output capacitor.