LM2937ES-5.0

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PMIC - Voltage Regulators - Linear is one of the most important categories of electrical components used for the regulation of current and voltage. The device used for this purpose is called the Linear Voltage Regulator, or the LVR. LM2937ES-5.0 is one of such voltage regulator, widely used in various battery applications, charger applications and small electronic equipment applications. This article will provide information about the applications and working principles of LM2937ES-5.0.

Application Field of LM2937ES-5.0:

LM2937ES-5.0 is a 5.0V low dropout voltage regulator which can be used to power mobile phones, PDA’s, digital cameras and many other small electronic devices. The device is small in size and is suitable for hand held applications where size occupied by the device is critical. It is a single-output, high current or low current compatible, space-saving solution.

The key features of LM2937ES-5.0 are as follows:

• High Output Current - up to 1.5A
• Low Dropout Voltage - typically 1V
• High PSRR - typically 100dB at 1kHz
• Ripple Rejection - typically 70dB at 10kHz
• High Input Voltage - up to 16V
• Reverse Voltage Protection
• Low Quiescent Current - typically 8mA
• Available in an 8- pin PDIP package

LM2937ES-5.0 is widely used in mobile phone chargers which requires input voltage of 10-16V and output of 5.0V. The low dropout voltage of the device ensures that the voltage output is the same no matter what the input voltage is. It also offers an additional feature which is thermal shutdown protection, for when there is a short circuit and the device overheats. This makes LM2937ES-5.0 a very reliable and efficient device.

The device is also suitable for various other battery applications such as, power backup systems, automotive system, battery management systems and so on. LM2937ES-5.0 is also used in camera modules, handheld devices like PDA and similar small electronic equipment. Its power saving design and low quiescent current is perfect for such applications.

Working Principle of LM2937ES-5.0:

The basic operation of the LM2937ES-5.0 is actually quite simple. The device is a linear voltage regulator which means that it operates on the principle of reducing a higher input voltage down to the desired output voltage. This is done with the help of a series of resistors which form the voltage divider or voltage control circuit. A voltage divider is an electronic circuit which divides an input voltage into two parts by the use of two resistors. As the name suggests, the two resistors are connected in series with each other and the input voltage is divided between the two. The output is taken across the lower resistor. The LM2937ES-5.0 works in a similar way where the resistors form the voltage control circuit that is used to adjust the output to the required level.

When the input voltage is higher than the output voltage, the LM2937ES-5.0 is activated and the internal circuitry works to reduce the input voltage and regulate it to the required output voltage. For this, the voltage control circuit is used to adjust the output voltage. To do this, the LM2937ES-5.0 uses two feedback loops with two separate resistor networks; one for the regulated output and the other for the unregulated input. The output voltage from the LM2937ES-5.0 is determined by the ratio of the two resistors in the voltage control circuit. During operation, the input voltage is reduced to the required output level and this is compared to a reference voltage. When the two voltages are equal, the device is operating at regulation. If the output voltage is greater than the reference voltage, then the LM2937ES-5.0 will reduce the input voltage until it reaches the required level.

The LM2937ES-5.0 can also offer additional features such as thermal shutdown protection which prevents the device from overheating in the event of a short circuit. The device is a very efficient voltage regulator that is well suited for a wide range of applications.

In conclusion, LM2937ES-5.0 is a single-output, low-dropout voltage regulator that can be used to power a wide range of mobile devices, PDA’s and electronic equipment. Its low dropout voltage and high PSRR makes it a very efficient device for such applications. In addition, the device also offers additional features such as thermal shutdown protection which protect it from short circuits and excessive heat.

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