t

=

120·R

L

120+R

L

·C

OUT

TLV713P-Q1

www.ti.com

SBVS266 – MAY 2015

7.3 Feature Description

7.3.1 Undervoltage Lockout (UVLO)

The TLV713P-Q1 uses a UVLO circuit that disables the output until the input voltage is greater than the rising

UVLO voltage. This circuit ensures that the device does not exhibit any unpredictable behavior when the supply

the TLV713P-Q1 is connected to ground with a 120-

Ω pulldown resistor.

7.3.2 Shutdown

Turn off the device by forcing the EN pin to drop below 0.4 V. If shutdown capability is not required, connect EN

to IN.

The TLV713P-Q1 has an internal pulldown MOSFET that connects a 120-

Ω resistor to ground when the device is

(1)

7.3.3 Foldback Current Limit

The TLV713P-Q1 has an internal foldback current limit that helps protect the regulator during fault conditions.

The current supplied by the device is gradually reduced when the output voltage decreases. When the output is

shorted, the LDO supplies a typical current of 40 mA. Output voltage is not regulated when the device is in

current limit, and is calculated by Equation 2:

(2)

turns off. The device is turned on by the internal thermal shutdown circuit during cool down. If the fault condition

continues, the device cycles between current limit and thermal shutdown. See the Thermal Information section

for more details.

The TLV713P-Q1 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.

7.3.4 Thermal Protection

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 regulator dissipation, protecting the device 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 must be limited to 125°C maximum. To estimate the margin

of safety in a complete design (including heatsink), increase the ambient temperature until the thermal protection

is triggered; use worst-case loads and signal conditions.

The TLV713P-Q1 internal protection circuitry is designed to protect against overload conditions. This circuitry is

not intended to replace proper heatsinking. Continuously running the TLV713P-Q1 into thermal shutdown

degrades device reliability.

Copyright © 2015, Texas Instruments Incorporated

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