The TPS7H1210-SEP provides a dual-polarity enable pin (EN) that turns on the regulator when |V_EN| > 2 V, whether the voltage is positive or negative, as shown in Figure 7-1. Specifically, if V_EN ≥ V_EN(+HI) or V_EN ≤ V_EN(–HI), the regulator is enabled. If V_EN(+LO) ≥ V_EN ≥ V_EN(–LO), the regulator is disabled.

This functionality allows for different system power management topologies; for example:

• Connecting the EN pin directly to a negative voltage, such as V_IN.
• Connecting the EN pin directly to a positive voltage, such as the output of digital logic circuitry.
• Connecting the EN pin to a resistor divider from V_IN to GND to turn-on at a specific input voltage level (programmable turn-on voltage).

Figure 7-1 Enable Pin Positive and Negative Threshold