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PMIC - Voltage Regulators - DC DC Switching Regulators

The E-L4971D is a highly integrated dc-dc step-down regulator dedicated for automotive and industrial applications. This regulator provides an output power of 6W-15W with typical input voltages of 4.5v-18v. The regulator provides multiple system protection features including over-voltage, over-temperature, overload, and short circuit protection. The internal structure consists of a high-performance synchronous buck converter with a high-side and a low-side switch.

E-L4971D Application Field

The E-L4971D is ideal for automotive and industrial applications, especially those requiring a wide input voltage range. It is suitable for applications such as vehicle cameras, power switching, electric tool/chargers, automotive start-stop systems and vehicle infotainment systems. Its ability to provide high efficiency and excellent power conversion and thermal performance makes it suitable for automotive applications such as vehicles and heavy-duty machinery.

E-L4971D Working Principle

The E-L4971D contains a synchronous buck converter with a high-side and a low-side switch. The high-side switch is responsible for connecting the input voltage to the inductor while the low-side switch is responsible for connecting the inductor to the output voltage. The on-time of the switch is controlled by the error amplifier.When the output voltage is above the set value, the error amplifier closes the high-side switch and opens the low-side switch, allowing the inductor to store energy. As the inductor stores energy, the output voltage decreases. When the output voltage is below the set value, the error amplifier opens the high-side switch and closes the low-side switch, allowing the inductor to release energy. As the inductor releases energy, the output voltage increases. The cycle will continue until the output voltage reaches the set value.The E-L4971D also includes multiple system protection features including over-voltage, over-temperature, overload, and short circuit protection. These features help ensure that the regulator has a long life and a reliable operation even in harsh environments.

Conclusion

E-L4971D is a high performance synchronous buck regulator dedicated for automotive and industrial applications. It offers excellent power conversion and thermal performance with wide input voltage range of 4.5V-18V and automatic protection features such as over-voltage, over-temperature, overload, and short circuit protection. The regulator is suitable for applications such as vehicle cameras, power switching, electric tool/chargers, automotive start-stop systems and vehicle infotainment systems.

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