LM2941LD

Current - Output:	1A
Base Part Number:	LM2941
Supplier Device Package:	8-WSON (4x4)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Reverse Polarity, Short Circuit
Control Features:	Enable
PSRR:	--
Current - Supply (Max):	15mA
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1V @ 1A
Voltage - Output (Max):	20V
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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<h2>LM2941LD Application Field and Working Principle</h2><h3>Introduction</h3>The LM2941LD is a monolithic negative linear voltage regulator designed for use in power supplies, battery chargers, or for other applications with current requirements up to 2 A. This device can also be used in isolated supplies where the output voltage is negative relative to the input voltage. The LM2941 is a three-terminal adjustable or fixed output voltage device with line and load regulation comparable to many 5A SOT-223 devices.<h3>Application Field</h3>The LM2941LD is suitable for a wide range of applications due to its low quiescent currents and adjustable output voltage. The ability to be used in isolated supply applications make it ideal for applications such as power supplies, battery chargers, or other applications with current requirements up to 2A.<h3>Working Principle</h3>The LM2941LD is a three-terminal voltage regulator that provides a regulated output voltage from 0.8V to 37V. It is composed of an NPN transistor, a zener diode and two resistors that are connected in series between the input and output terminal (Vin and Vout) of the device. The zener diode is configured in the reverse direction and the resistors are used to set the output voltage, as well as the current limit.The quiescent current through the device is controlled by the current through the NPN transistor. The base of the transistor is connected to the output terminal (Vout). The transistor can be operated in either a "series pass" or "shunt pass" configuration. The series pass configuration reduces the output voltage slightly, while the shunt pass configuration increases it. The transistor also acts as a current limit when a large input voltage is applied, reducing the current to the output terminal.The NPN transistor and the zener diode form a voltage divider that sets the output voltage. The output voltage is determined by the dividing ratio of the resistors and the zener voltage. The zener voltage is set by the manufacturer and will remain constant unless the device is damaged or the temperature changes. As the output voltage changes, the current through the NPN transistor is also adjusted to provide the correct voltage across the load.The LM2941LD also has an enable pin that can be used to turn off the device in power saving mode. This pin can be connected to a TTL logic circuit, allowing the device to be turned on and off as needed.<h3>Conclusion</h3>The LM2941LD is an excellent choice for applications with current requirements up to 2A and requiring an adjustable or fixed output voltage. The low quiescent currents and the ability to be used in isolated supplies make it the perfect device for many different applications. The voltage regulator also has an enable pin for power saving mode and the NPN transistor provides excellent current limiting.

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