LP2992_15 datasheet(14/33 Pages) TI

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LP2992

SNVS171H – NOVEMBER 2001 – REVISED JANUARY 2015

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Feature Description (continued)

The LP2992 is featured with the foldback current limit that allows a high peak current when VOUT > 0.5 V, and

then reduces the maximum output current as VOUT is forced to ground.

7.3.6 Overtemperature Protection

The LP2992 is designed with the thermal shutdown circuitry to turn off the output when excessive heat is

dissipated in the LDO. The internal protection circuitry of the LP2992 is designed to protect against thermal

overload conditions. Continuously running the device into thermal shutdown degrades its reliability.

7.4 Device Functional Modes

7.4.1 Operation with VOUT(TARGET) + 0.9 V ≥ VIN ≥ 16 V

The LP2992 operates if the input voltage is equal to or exceeds VOUT(TARGET) + 0.9 V. At input voltages below the

minimum VIN requirement, the device does not operate correctly and output voltage may not reach a target value.

7.4.2 Operation with ON/OFF Control

If the voltage on the ON/OFF pin is less than 0.15 V, the device is disabled and, in this shutdown state, current

does not exceed 2 µA. Raising the voltage at the ON/OFF pin above 1.6 V initiates the start-up sequence of the

device. If this feature is not to be used, the ON/OFF input should be tied to VIN to keep the regulator output on at

all times.

To assure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and

below the specified turn-on/turn-off voltage thresholds listed in the Electrical Characteristics section under

VON/OFF. To prevent mis-operation, the turn-on (and turn-off) voltage signals applied to the ON/OFF input must

have a slew rate which is

≥ 40 mV/µs.

CAUTION

The regulator output voltage can not be ensured if a slow-moving ac (or dc) signal is

applied that is in the range between the specified turn-on and turn-off voltages listed

under the electrical specification VON/OFF (see Electrical Characteristics).

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