The low open-loop output impedance provided by the NMOS pass transistor in a voltage follower configuration allows operation without an output capacitor for many applications. As with any regulator, the addition of a capacitor (nominal value 1μF) from the OUT pin to ground reduces undershoot magnitude but increases the duration. In the adjustable version, the addition of a capacitor, C_FB, from the OUT pin to the FB pin also improves transient response.

The TPS732 does not have active pulldown when the output is overvoltage. This feature allows applications that connect higher voltage sources, such as alternate power supplies, to the output. This feature also results in an output overshoot of several percent if the load current quickly drops to zero when a capacitor is connected to the output. The duration of overshoot is reduced by adding a load resistor. The overshoot decays at a rate determined by output capacitor C_OUT and the internal or external load resistance. The rate of decay is given by:

(Fixed voltage versions)

Equation 4.

(Adjustable voltage version)

Equation 5.