TPS795

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SLVS350I – OCTOBER 2002 – REVISED MAY 2015

7.3 Feature Description

7.3.1 Shutdown

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

shutdown capability is not required, EN can be connected to IN.

7.3.2 Start-Up

Functional Block Diagrams). This circuit allows for the combination of very low output noise and fast start-up

appropriate for this configuration.

7.3.3 Undervoltage Lockout (UVLO)

The TPS795 uses an undervoltage lockout circuit to keep the output shut off until internal circuitry is operating

properly. The UVLO circuit has approximately 100 mV of hysteresis to help reject input voltage drops when the

regulator first turns on.

7.3.4 Regulator Protection

The TPS795 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input

voltage drops below the output voltage (for example, during power down). Current is conducted from the output

to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting

might be appropriate.

The TPS795 features internal current limiting and thermal protection. During normal operation, the TPS795 limits

output current to approximately 2.8 A. When current limiting engages, the output voltage scales back linearly until

the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be

taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds

than approximately 140°C, regulator operation resumes.

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