The SNS pin of the device can be used to monitor the output voltage of the device or another voltage rail. The pin can be configured with an external resistor divider to set the desired trip point for the voltage being monitored or be tied to OUT directly. If the voltage on the SNS pin exceeds V_IH,SNS, the voltage being monitored on the SNS pin is considered to be valid high. The voltage on the SNS pin must be greater than V_IH,SNS for at least t_BLANK before PG is asserted high. If the voltage on the SNS pin goes below V_IL,SNS, then the switch powers cycle (that is, the switch is disabled and re-enabled). For proper functionality of the device, this pin must not be left floating. If a resistor divider is not being used for voltage sensing, this pin can be tied directly to V_OUT.

The SNS pin has a blanking time of t_BLANK on the rising edge after the V_IH,SNS threshold has been exceeded. The SNS pin has a de-glitch time of t_DEGLITCH when the voltage has gone below V_IL,SNS.

See Equation 2 and Figure 9-2 on how to configure the SNS pin for voltage monitoring.

Equation 2.

where

• V_IH,SNS is the the rising threshold of the SNS pin (see Electrical Characteristics table)
• V_OUT is the voltage on the OUTpin
• R_SNS1, R_SNS2 are the resistor divider values

Figure 9-2 Voltage Divdier (SNS Pin)