6.3.5 Reverse Current

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

regulator to the input when the gate of the pass transistor is pulled low. To make sure all charge is removed from

the gate of the pass transistor, drive the EN pin low before the input voltage is removed. If this process is not

done, the pass transistor is potentially left on because of stored charge on the transistor.

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 resulting from the voltage applied on the OUT pin. Additional

current flows into the OUT pin from the 80kΩ internal resistor divider to ground (see Figure 6-1 and Figure 6-2 ).

For the TPS73201, reverse current potentially flows when VFB is more than 1V above VIN.

6.4 Device Functional Modes

6.4.1 Normal Operation With 1.7V ≤ VIN ≤ 5.5V and VEN ≥ 1.7V

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

When operating the device near 5.5V, suppress any transient spikes that exceed the 6V absolute maximum

voltage rating. Never operate the device at a DC voltage greater than 5.5V.

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TPS732

SBVS037R – AUGUST 2003 – REVISED MAY 2025

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