TPS732

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SBVS037P – AUGUST 2003 – REVISED DECEMBER 2015

Feature Description (continued)

7.3.5 Reverse Current

The NMOS pass element of the TPS732 provides inherent protection against current flow from the output of the

regulator to the input when the gate of the pass device is pulled low. To ensure that all charge is removed from

the gate of the pass element, the EN pin must be driven low before the input voltage is removed. If this is not

done, the pass element may be left on due to stored charge on the gate.

After the EN pin is driven low, no bias voltage is needed on any pin for reverse current blocking. Reverse current

is specified as the current flowing out of the IN pin due to voltage applied on the OUT pin. Additional current will

flow into the OUT pin due to the 80-k

Ω internal resistor divider to ground (see Figure 29 and Figure 30).

7.4 Device Functional Modes

7.4.1 Normal Operation With 1.7 V

The TPS732 family requires an input voltage of at least 1.7 V to function properly and attempt to maintain

regulation.

When operating the device near 5.5 V, take care to suppress any transient spikes that may exceed the 6-V

absolute maximum voltage rating. The device should never operate at a DC voltage greater than 5.5 V.

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