TLV704

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SBVS148D – OCTOBER 2010 – REVISED JANUARY 2015

7.4 Device Functional Modes

7.4.1 Normal Operation

The device regulates to the nominal output voltage under the following conditions:

•

The input voltage is greater than the nominal output voltage added to the dropout voltage.

•

The output current is less than the current limit.

7.4.2 Dropout Operation

If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other

conditions are met for normal operation, the device operates in dropout mode. In this condition, the output

voltage is the same the input voltage minus the dropout voltage. The transient performance of the device is

significantly degraded because the pass device is in a triode state and no longer controls the current through the

LDO. Line or load transients in dropout may result in large output voltage deviations.

Table 1 lists the conditions that lead to the different modes of operation.

Table 1. Device Functional Mode Comparison

PARAMETER

OPERATING MODE

Normal mode

Dropout mode

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