TLV716

TLV716P

www.ti.com

SBVS217A – JUNE 2013 – REVISED SEPTEMBER 2013

INTERNAL CURRENT LIMIT

The TLV716 has an internal foldback current limit that helps protect the regulator during fault conditions. The

current supplied by the device gradually reduces while the output voltage decreases. When the output is

connected to ground, the LDO supplies a typical current of 40 mA. When in current limit, the output voltage is not

internal thermal shutdown circuit turns on the device. If the fault condition continues, the device cycles between

current limit and thermal shutdown. See the Thermal Information section for more details.

The TLV716 PMOS pass element has a built-in body diode that conducts current when the voltage at OUT

exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated,

external limiting to 5% of the rated output current is recommended. A small schottky diode connected with the

anode to OUT and the cathode to IN can accomplish this limiting.

SHUTDOWN

The enable pin (EN) is active high. The device is enabled when the EN pin goes above 0.9 V. This relatively low

value of voltage required to turn the LDO regulator on can be used to enable the device with the general-purpose

input/output (GPIO) of recent processors whose GPIO voltage is lower than traditional microcontrollers.

The device is turned off when the EN pin is held at less than 0.4 V. When shutdown capability is not required, the

EN pin can connected to the IN pin. The TLV716P will pull down the output with a 120

Ω resistor when the EN pin

falls below 0.4 V.

DROPOUT VOLTAGE

the PMOS device behaves like a resistor in dropout.

UNDERVOLTAGE LOCKOUT (UVLO)

The TLV716 and TLV716P use an undervoltage lockout circuit (1.3 V, typical) to keep the output shut off until the

internal circuitry is operating properly.

THERMAL INFORMATION

Thermal protection disables the output when the junction temperature rises to approximately +158°C, allowing

the device to cool. When the junction temperature cools to approximately +140°C, the output circuitry is again

enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection

circuit may cycle on and off. This cycling limits the dissipation of the regulator, protecting it from damage as a

result of overheating.

Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate

heatsink. For reliable operation, junction temperature should be limited to +125°C maximum. To estimate the

margin of safety in a complete design, increase the ambient temperature until the thermal protection is triggered;

use worst-case loads and signal conditions. The ambient temperature at which thermal shutdown occurs on the

device is 33°C higher (158°C - 125°C) than the maximum recommended operating conditions.

The internal protection circuitry of the TLV716 and TLV716P is designed to protect against overload conditions.

This circuitry is not intended to replace proper PCB layout and heatsinking. Continuously running the device into

thermal shutdown degrades reliability.

Copyright © 2013, Texas Instruments Incorporated

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