Device

IN

OUT

GND

Schottky Diode

Internal Body Diode

Input Voltage

Output Voltage

Output Voltage in

normal regulation.

Dropout

Response time for

LDO to get back into

regulation.

Load current discharges

output voltage.

Time

11

TLV757P

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Application Information (continued)

Figure 8. Startup into Dropout

8.1.4 Reverse Current

As with most LDOs, excessive reverse current can damage this device.

Reverse current flows through the body diode on the pass element instead of the normal conducting channel. At

high magnitudes, this current flow degrades the long-term reliability of the device, as a result of one of the

following conditions:

•

Degradation caused by electromigration

•

Excessive heat dissipation

•

Potential for a latch-up condition

Conditions where reverse current can occur are outlined in this section, all of which can exceed the absolute

•

•

The output is biased when the input supply is not established

•

The output is biased above the input supply

If reverse current flow is expected in the application, external protection must be used to protect the device.

Figure 9 shows one approach of protecting the device.

Figure 9. Example Circuit for Reverse Current Protection Using a Schottky Diode