L4963D

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DC-DC switching regulators are an important component of power management integrated circuit (PMIC) technology. One such device is the STMicroelectronics L4963D, a single-channel, current-mode, synchronous buck regulator that delivers up to 3A output current with integrated low dropout (LDO) linear regulator and a shutdown mode. The L4963D is designed for usage in automotive, consumer, and industrial applications as well as aerospace. In this article, we will look at its application field, operation and working principle.

Application Field of the L4963D

The L4963D is designed for use in automotive, consumer, industrial and aerospace applications such as automotive microcontrollers and digital engine controllers, switching power supplies, battery chargers, industrial, consumer and automotive electronics and more. It is also suitable for applications in automotive vehicles, industrial automation applications, consumer electronics, and other equipment where high-efficiency power conversion is necessary. The device is also UL-recognized and rated for automotive applications.

Operational Features

The L4963D offers a wide input voltage range from 2.5V to 16V and an adjustable output voltage. It also features programmable frequency and ramp frequency for improved efficiency. It also has an integrated low-dropout (LDO) linear regulator, allowing for low-power applications without the need for an additional regulator to support low voltage level. The device also features a shutdown mode and over-current protection (OCP) features. The L4963D also features cycle by cycle current limitation, thermal protection and over-temperature protection.

Working Principle

The L4963D uses PWM control to regulate the output voltage. This is accomplished by using a fixed frequency, current-mode control. The input voltage is converted to a current which is then switched at a fixed frequency, with the duty cycle adjusted depending on the output voltage. The current-mode control ensures that the output voltage is tightly regulated, regardless of load changes. The integrated feedback loop ensures that the output remains within a small tolerance. The L4963D has an adjustable output voltage and response time. The output voltage is also monitored to ensure that it stays within tolerance.

Conclusion

The STMicroelectronics L4963D is an integrated, single-channel, current-mode, synchronous buck regulator designed for use in automotive, consumer and industrial applications as well as aerospace. It features an integrated LDO linear regulator, provides up to 3A output current, offers a wide input voltage range, adjustable output voltage, programmable frequency and ramp frequency, and offers a range of operational features and protections. The device uses PWM current-mode control, which provides tight output voltage regulation, and is rated for automotive industry applications. Joining STmicro\'s range of PMICs, the L4963D offers a flexible and reliable solution for any power management application.

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