TPS783xx

GND

EN

IN

OUT

V

IN

V

OUT

1 F

m

1 F

m

TPS783

SBVS133A – FEBRUARY 2010 – REVISED NOVEMBER 2014

www.ti.com

Feature Description (continued)

7.3.2 Shutdown

The enable pin (EN) is active high and is compatible with standard and low-voltage CMOS levels. When

shutdown capability is not required, connect EN to the IN pin, as shown in Figure 18.

Figure 18. Circuit Showing EN Tied High When Shutdown Capability is Not Required

7.4 Device Functional Modes

Table 1 provides a quick comparison between the normal, dropout, and disabled modes of operation.

Table 1. Device Functional Mode Comparison

PARAMETER

OPERATING MODE

EN

Normal

Dropout

Disabled

—

—

7.4.1 Normal Operation

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

•

•

decreased below the enable falling threshold.

•

•

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 mode, the output voltage

tracks the input voltage. During this mode, the transient performance of the device becomes 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 can result in large output-voltage deviations.

7.4.3 Disabled

The device is disabled under the following conditions:

•

the enable rising threshold.

•

10

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