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TLV741P

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SBVS309 – JULY 2017

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8.4 Device Functional Modes

8.4.1 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 enable voltage has previously exceeded the enable rising threshold voltage and has not decreased

below the enable falling threshold.

•

The output current is less than the current limit.

•

The device junction temperature is less than the maximum specified junction temperature.

8.4.2 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 mode of operation, the

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

device is significantly degraded because the pass device is in the linear region and no longer controls the current

through the LDO. Line or load transients in dropout can result in large output voltage deviations.

8.4.3 Disabled

The device is disabled under the following conditions:

•

The enable voltage is less than the enable falling threshold voltage or has not yet exceeded the enable rising

threshold.

•

The device junction temperature is greater than the thermal shutdown temperature.

Table 1 lists conditions that result in different operating modes.

Table 1. Device Functional Mode Comparison

OPERATING MODE

PARAMETER

Normal mode

Dropout mode

—

Disabled mode

(any true condition disables the

device)

—

—