L4995RKTR Integrated Circuits (ICs)

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PMIC - Voltage Regulators - Linear

L4995RKTR is a high-efficiency, low-dropout regulator, featuring wide input of 2.25V to 28V, delivering up to 100 mA, suitable for adjusting the voltage of a system or providing isolated bias voltage rails. It is available in the package solutions of TO-92 and SOT223-6L, providing designers with flexible configuration and excellent thermal capability.

Application fields

This family of voltage regulators enables a range of cost- and space-effective solutions in many areas such as:

• Industrial control: the L3995RKTR regulator provides a cost-effective solution for industrial automation controlling system to supply noise-filtering voltages higher than the normal I/O voltages.
• Networking device: the L3995RKTR can provide pre-regulation and post-regulation voltage to the system, helping to make the system more reliable.
• Computer system: the L3995RKTR’s capability to eliminate ripple and noise makes it an ideal choice to be used in mini-sized circuit board with limited space.
• Telecommunication: the L3995RKTR provides stable and low dropout voltage to voltage-driven communication systems.

Working principle

The working principle of the L3995RKTR Linear Voltage Regulator is based on feedback regulation. It contains a control circuit, which detects the output voltage and regulates it. There is a reference voltage source in the control circuit, and this voltage is compared with the output voltage. In case the output voltage is higher than the reference, the circuit opens a feedback switch and decreases the output voltage. On the other hand, if the output voltage is lower than the reference, the circuit closes the switch to increase the output voltage.

The regulator also includes an output transistor with an internal current limiter, protection circuitry, and a voltage reference. The voltage reference is a constant voltage regulated by a responsive network. When the output voltage deviates from the reference voltage, the error amplifier cuts or opens the loop between the output and the GND, such that the output voltage can be adjusted until the reference voltage and output voltage match again. This process is iterative, and the output voltage will be stabilized at the reference voltage.

The biggest advantage of using a linear regulator is its low cost. Since it does not employ complicated switch mode circuits, it can work with lower conductive losses and lower noise compared with a switching regulator. Due to its low dropout voltage, it is also ideal for portable applications where the input voltage is close to the output voltage.

Conclusion

The L3995RKTR is a cost-effective linear voltage regulator with wide input of 2.25V to 28V, delivering up to 100 mA for the applications of industrial control, networking device, computer system, and telecommunication. Its output voltage is regulated by a feedback regulation circuitry with a reference voltage, an error amplifier, an output transistor and current limiter, and protection circuitry. It works with lower conductive losses and lower noise than a switching regulator, and is ideal for portable applications.

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