TLV716, TLV716P

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SBVS217B – JUNE 2013 – REVISED NOVEMBER 2015

7.3 Feature Description

7.3.1 Internal Current Limit

The TLV716 and TLV716P have 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 regulated and VOUT = IOUT × RLOAD; see Figure 10 and Figure 11. The PMOS pass transistor

dissipates [(VIN – VOUT) × ILIMIT] until thermal shutdown is triggered and the device turns off. When the device

cools down, the 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 Considerations 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.

7.3.2 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.

7.3.3 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.

7.4 Device Functional Modes

7.4.1 Capacitor-Free Operation

The TLV716 and TLV716P are stable without the use of input or output capacitors. This functionality results in a

reduction of component count, cost, and solution size. In addition, without the need of external capacitors, the

ultra-small, 1.2-mm × 1.2-mm DPQ package optimizes the solution size for board space-constrained applications.

To optimize device AC performance, an input and output capacitor is recommended, as described in the Input

and Output Capacitor Requirements section.

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Product Folder Links: TLV716 TLV716P