LM2937IMP-15/NOPB

Current - Output:	400mA
Base Part Number:	LM2937
Supplier Device Package:	SOT-223-4
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	--
Current - Supply (Max):	20mA
Current - Quiescent (Iq):	2mA
Series:	--
Voltage Dropout (Max):	1V @ 50mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	15V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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<p>The LM2937IMP-15/NOPB is a monolithic voltage regulator specially designed to supply microprocessor systems in the automotive environment. It features wide-input voltage operation, low dropout voltage, and very low ground current. This regulator combines internal and external components; it provides a wide range of voltage regulation to supply microprocessors and other components. The LM2937IMP-15/NOPB application field includes both 5 and 15V output regulated circuits, and is portrayed below.</p><h2>Application</h2><p>The LM2937IMP-15/NOPB integrated circuit is a low dropout voltage (LDO) low voltage, highly integrated linear voltage regulator specifically designed for automotive applications. It provides a wide range of overvoltage protection (OVP), and is suitable for applications where voltage fluctuations and fault conditions must be dealt with. LM2937IMP-15/NOPB is typically used in any application that requires a stable supply of current over a wide operating temperature range. This voltage regulator can be used in automotive, industrial and communication systems that must maintain supply voltage integrity over a wide range of environmental conditions, such as in PWM LED drivers and high efficiency power supplies.</p><h2>Features</h2><p>The LM2937IMP-15/NOPB offers a number of outstanding performance advantages over its competitors:</p><ul> <li>Wide operating input voltage range, from 4.5V to 40V</li> <li>200mA continuous output current</li> <li>Low dropout voltage (typical 1.3V @ 200mA)</li> <li>Very low ground current, typically 63μA @ 15Vout</li> <li>Enhanced power supply rejection ratio</li> <li>Overvoltage protection (OVP)</li></ul><p>The LM2937IMP-15/NOPB can also be used in battery-powered systems requiring more efficient operation, as it can supply more load current with minimum load voltage.</p><h2>Benefits and Advantages</h2><p>The LM2937IMP-15/NOPB offers a wide range of benefits and advantages over other LDO voltage regulators:</p><ul> <li>Very low power dissipation (typically 0.5mW @ 15V out at 1mA)</li> <li>Small physical size</li> <li>Wide operating temperature range (-40C to 150C)</li> <li>Overall output current capability of 200mA</li> <li>High ripple rejection (83dB typically)</li></ul><p>In addition, the LM2937IMP-15/NOPB offers an adjustable output voltage range (1.8V – 5V or 3.3V – 15V) which allows it to be used in a number of different applications. This regulator also offers fast transient response, requiring no external compensation.</p><h2>Working Principle</h2><p>The LM2937IMP-15/NOPB is an LDO voltage regulator which operates according to the following working principle. The circuit consists of an input voltage (Vin), an output voltage (Vout), and voltages across two resistors: R1, which divides the input voltage into two parts, and R2, which is connected to the base of the NPN transistor (T1). The NPN transistor T1 is connected as an emitter follower and functions as an output current limiting device. When the output voltage (Vout) is lower than the divided Vin by a certain value (Vdelta) , the voltage across R2 is less than the base-emitter voltage of the transistor (Vbe). This allows the transistor to be turn ON, and consequently, the output voltage (Vout) will rise until it reaches the required value. </p><p>The main advantage of this circuit is that it requires very low current to regulate the output voltage, thus making it more energy-efficient compared to other voltage regulators. Additionally, the use of an emitter follower configuration allows the circuit to maintain a relatively low dropout voltage. Moreover, the use of an intrinsically stable NPN transistor ensures that the circuit has excellent dynamic response characteristics. This makes it ideal for high-speed applications, such as those in automotive, automotive communication and industrial systems.</p><p>In conclusion, the LM2937IMP-15/NOPB is powerful and reliable LDO voltage regulator, ideally suited for automotive and other demanding applications, which require wide input voltage operation, low dropout voltage, and very low ground current.</p>

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