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LP2982

SNVS128K – MARCH 2000 – REVISED JUNE 2016

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Copyright © 2000–2016, Texas Instruments Incorporated

Feature Description (continued)

7.3.4 Low Ground Current

The LP2982 uses a vertical PNP process which allows for quiescent currents that are considerably lower than

those associated with traditional lateral PNP regulators, typically 375 μA at 50-mA load and 80 μA at 1-mA load.

7.3.5 Sleep Mode

quiescent current is consumed. This function is designed for the application which needs a sleep mode to

effectively enhance battery life cycle.

7.3.6 Short-Circuit Protection (Current Limit)

The internal current-limit circuit is used to protect the LDO against high-load current faults or shorting events. The

LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources

constant current. Therefore, the output voltage falls when load impedance decreases. If a current limit occurs

and the resulting output voltage is low, excessive power may be dissipated across the LDO resulting in a thermal

shutdown of the output. A foldback feature limits the short-circuit current to protect the regulator from damage

under all load conditions. If OUT is forced below 0 V before EN goes high, and the load current required exceeds

the foldback current limit, the device may not start up correctly.

7.3.7 Thermal Protection

The LP2982 contains a thermal shutdown protection circuit to turn off the output current when excessive heat is

dissipated in the LDO. The thermal time-constant of the semiconductor die is fairly short, and thus the output

cycles on and off at a high rate when thermal shutdown is reached until the power dissipation is reduced. The

internal protection circuitry of the LM2982 is designed to protect against thermal overload conditions. The

circuitry is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown

degrades its reliability.

7.4 Device Functional Modes

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 the shutdown current does not

exceed 1 μA. Raising ON/OFF above 1.4 V initiates the start-up sequence of the device.