The TPS709xx datasheet states that the enable pin includes a clamping zener:
"Enabled: When EN goes above 0.9 V, the device is enabled. Enable is pulled high by a 300-nA current source; therefore, the enable pin (EN) can be left floating to enable the device. Do not connect EN to VIN.The enable pin is clamped by a 6.5-V zener. Do not exceed the 7-V absolute maximum rating on the enable pin or excessive current flowing into the zener clamp will destroy the device."
Can we bias this pin with a higher current than 300 nA by tying it through a resistor to a higher voltage than 7V, such as the input supply, and rely on the zener clamp to limit the pin voltage? This could provide additional robustness in the presence of noise or board leakage.
If this is possible, what is the maximum current allowed into the pin / clamp?
