An external capacitor, C_SS, connected between the VOUT and SS pins sets the slew rate. The desired slew rate VOUT_SR is determined by t_r, the rise time in seconds, and ΔV, the change in VOUT voltage in Volts as shown in Equation 3.

Equation 3.

In order to avoid false trips due to the programmable current limit, the desired slew rate must be less than VOUT_SR,MAX as shown in Equation 4, where I_L is the programmed current limit, I_VOUT is the normal operation current flowing through the switch, and C_OUT is the output capacitor.

Equation 4.

Once the slew rate has been calculated and meeting the constraint in Equation 4, the C_SS capacitor is then calculated using Equation 5 for VIN < 3-V and IOUT ≥ 3-A applications. For all other applications, use Equation 6.

Equation 5.

for VIN < 3 V and IOUT ≥ 3 A

Equation 6.

for all other conditions