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TLV741P_1808 Datasheet(PDF) 12 Page - Texas Instruments

Part # TLV741P_1808
Description  150-mA, Low-Dropout Regulator With Foldback Current Limit for Portable Devices
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV741P_1808 Datasheet(HTML) 12 Page - Texas Instruments

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OUT
LIMIT
LOAD
V
I
R
=
´
t
=
120·R
L
120+R
L
·C
OUT
12
TLV741P
SBVS309 – JULY 2017
www.ti.com
Product Folder Links: TLV741P
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Undervoltage Lockout (UVLO)
The TLV741P device uses a UVLO circuit that disables the output until the input voltage is greater than the rising
UVLO voltage. The circuit ensures that the device does not exhibit any unpredictable behavior when the supply
voltage is lower than the operational range of the internal circuitry, VIN(min). During UVLO disable, the output of
the TLV741P version is connected to ground with a 120-Ω pulldown resistor.
8.3.2 Shutdown
The enable pin (EN) is active high. Enable the device by forcing the EN pin to exceed VEN(high) (0.9 V, minimum).
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 TLV741P has an internal pulldown MOSFET that connects a 120-Ω resistor to ground when the device is
disabled. The discharge time after disabling depends on the output capacitance (COUT) and the load resistance
(RL) in parallel with the 120-Ω pulldown resistor. The time constant is calculated in Equation 1.
(1)
8.3.3 Foldback Current Limit
The TLV741P device has an internal foldback current limit that helps protect the regulator during fault conditions.
The current supplied by the device is gradually reduced while the output voltage decreases. When the output
shorts, 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)
The PMOS pass transistor dissipates [(VIN – VOUT) × ILIMIT] until thermal shutdown is triggered and the device
turns off. The internal thermal shutdown circuit turns on the device during cool down. If the fault condition
continues, the device cycles between current limit and thermal shutdown. See Thermal Information for more
details.
The TLV741P 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, TI
recommends externally limiting the rated output current to 5%.
8.3.4 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, which protects the device from damage as a
result of overheating.
Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate
heat sink. For reliable operation, junction temperature must be limited to 125°C maximum. To estimate the
margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal
protection is triggered; use worst-case loads and signal conditions.
The TLV741P internal protection circuitry is designed to protect against overload conditions. This circuitry is not
intended to replace proper heat sinking. Continuously running the TLV741P device into thermal shutdown
degrades device reliability.


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