LM2941LD/NOPB IC

Technical Specifications of LM2941LD/NOPB

Datasheet	LM2941LD/NOPB datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Regulators – Linear
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Regulator Topology	Positive Adjustable
Voltage – Output	5 V ~ 20 V
Current – Output	1A
Voltage – Dropout (Typical)	0.5V @ 1A
Number of Regulators	1
Voltage – Input	6 V ~ 26 V
Current – Limit (Min)	–
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-WDFN Exposed Pad
Supplier Device Package	8-WSON (4×4)

LM2941LD/NOPB Description

The LM2941 positive voltage regulator can provide 1 A of output current with a normal dropout voltage of 0.5 V and a maximum of 1 V across the entire operating temperature range. When the difference between the input and output voltage is more than 3 V, a quiescent current reduction circuit is activated to lower the current flowing through the ground pin. With a 5 V difference between input and output and 1 A of output current, the standby current is only 30 mA. Only in the dropout mode (VIN VOUT 3 V) does the regulator provide a higher quiescent current.

The LM2941 and its associated regulated circuitry are protected against two-battery jumps and reverse battery installations, making them ideal for vehicle use. The regulator will shut down immediately to protect its internal circuits and the load during line transients like load dump, where the input voltage can suddenly exceed the stipulated maximum operating voltage. Common regulator functions like short circuit and thermal overload protection are also included.

LM2941LD/NOPB Features

• functioning VIN From 6 to 26 volts.
• Adjustable output voltage ranges from 5 to 20 volts.
• Normally, the dropout voltage is 0.5 V at 1 A for IOUT.
• output current greater than one amp.
• Trim reference voltage.
• Battery protection in reverse.
• Restriction on the internal short-circuit current.
• Insertion Protection for Mirror Images.
• Product Improvement Tested using a P+.
• On/Off Switch for CMOS Compatible TTL.
• Space-saving WSON package.

LM2941LD/NOPB Applications

• Industrial
• Automotive

LM2941LD/NOPB Detailed Description

The LM2941 positive voltage regulator can provide 1 A of output current with a dropout voltage of approximately 0.5 V and a maximum of 1 V across its operating temperature range. In addition, the ground current is lowered by a quiescent current reduction circuit whenever the gap between the input and output voltages is larger than about 3 V. With a 5 V input-to-output voltage difference and a 1 A load, the quiescent current is only 30 mA. Higher quiescent currents exist in the dropout mode of the regulator (VIN – VOUT 3 V).

Feature Description

The Maximum Allowable Current in a Short Circuit Protecting the LDO from high-load current faults or shorting events is the job of the LDO’s internal current limit circuit. This LDO was not built to handle the continuous currents. The LDO maintains a continuous current source during a current-limit event. Hence, a lower load impedance results in a lower output voltage. However, remember that the LDO’s output could shut down due to overheating if the current restriction causes the voltage to drop below a certain level.

● Overvoltage Shutdown (OVSD)

When the input voltage exceeds 30 V, the LM2941’s output is disabled. However, the device’s functioning is not guaranteed when the input voltage exceeds the maximum suggested input voltage of 26 V. It is not advised to run continuously at an input voltage higher than the maximum allowed.

● Thermal Shutdown (TSD)

When the LDO’s internal temperature becomes too high, the output is turned down by the thermal shutdown circuitry contained in the LM2941. The LM2941 has built-in safeguards to prevent damage in the event of a thermal overload. Proper heat sinking is still required, and the TSD circuitry is not meant to replace it. The device’s reliability suffers as the junction temperature rises above the maximum junction temperature rating if the thermal shutdown is repeatedly triggered.

● Thermal Overload Protection

The junction temperature (TJ) in an LM2941 is normally capped at 155 degrees Celsius, thanks to the device’s linear thermal protection. In the event of a failure that causes excessive power dissipation, the LM2941 will respond by lowering the output current (and hence the power dissipation) to maintain the junction temperature at 155°C. Safeguards against thermal overload are not a given under normal conditions. Long-term use at or near the thermal overload state reduces the expected lifespan of the device and is therefore discouraged.

Device Functional Modes

Switchable On/Off Function There is no internal pull-up or pull-down on the ON/OFF pin; therefore, it must be actively or passively terminated somewhere to set a default state. The output can be turned on by setting the ON/OFF pin’s level low, and it can be turned off by setting its level high. The output is reliably turned off when the ON/OFF pin voltage is greater than the maximum ON/OFF(OFF) voltage threshold of 2 V, and turned on when it drops below the minimum ON/OFF(ON) voltage threshold of 0.8 V. Connecting this pin to Ground is an option if turning it on and off is not required. It is important to account for the voltage drop across the pull-up resistor if the ON/OFF pin is driven high by a series resistor.

Application and Implementation

● Output Capacitor

A tantalum capacitor with an ESR of 0.01 to 5 at the output pin is necessary for loop stability. The minimum capacitor value is 22 F. There can’t be more than 1 cm between it and the gadget. Any additional capacitance is permitted. It is also possible to use a good grade X5R/X7R 22 F ceramic capacitor for the output, but this will require simulating the ESR requirement with an adequate value of series resistance. The capacitance value of the ceramic capacitor used must be appropriately de-rated for the output voltage. For ESR modeling, use a series resistor between 0.1 and 1.

Conclusion

The LM2941 positive voltage regulator is a versatile and reliable device suitable for industrial and automotive applications. With a maximum output current of 1A, a low dropout voltage, and multiple protection mechanisms, the LM2941 can perform efficiently in various scenarios. However, proper heat sinking and junction temperature control are necessary, and an output capacitor and active/passive termination of the ON/OFF pin are required for loop stability. If you’re looking for a trusted supplier, ICRFQ provides excellent customer service and top-quality products. Upgrade your power system today with the LM2941 from ICRFQ to experience the best reliable and high-quality components.

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