E-L5973D

Introduction

The E-L5973D is a DC-DC switching regulator designed for use in applications with a wide range of input voltages. It is a highly efficient power management integrated circuit, offering low quiescent current and efficient power conversion from one voltage input to another. The E-L5973D is designed to convert an unregulated, wide-range input voltage (3.3V to 18V) into a regulated output voltage (1.8V to 5.5V). The on-board switching frequency can be externally adjusted between 250kHz and 500kHz, providing flexible performance in different applications.

Features and Benefits

• Wide input voltage support (3.3V to 18V)
• Integrated 4A buck switching regulator
• High efficiency operation (up to 95%)
• Low quiescent current operation
• User-adjustable switching frequency (250kHz to 500kHz)
• Soft start feature to reduce inrush current
• Current limit, over temperature and open loop protection
• Small package size (8-Pin SOIC)

Applications

The E-L5973D is designed for a range of applications, including automotive, industrial and consumer markets. It is particularly suitable for applications with several power rails, such as notebook computers and wireless communication systems. The wide input voltage range, low quiescent current operation and adjustable switching frequency make the E-L5973D ideal for powering low power, high efficiency and cost-sensitive systems.

Working Principle

The E-L5973D works by converting an unregulated input voltage into a regulated output voltage. The main components of the circuit are an input switch, an inductor, a feedback loop, an error amplifier and a control logic circuit. The operation of the E-L5973D starts when the input voltage is applied to the input switch. The input switch then transfers the input voltage to the inductor, storing energy in the form of a magnetic field. The energy stored in the inductor is then transferred, via the output diode, to the load, converting the input voltage into the desired output voltage.

The feedback loop within the E-L5973D includes an error amplifier, which compares the output voltage to a reference voltage. If the output voltage is higher than the reference voltage, the error amplifier reduces the duty cycle of the input switch, thus reducing the output voltage. If the output voltage is too low, the error amplifier increases the duty cycle of the input switch, increasing the output voltage. The E-L5973D also features a soft start feature to reduce inrush current and a current limit to protect the device from over-current conditions.

Conclusion

The E-L5973D is a highly efficient DC-DC switching regulator designed for use in wide range of applications. It offers low quiescent current and high efficiency operation from 3.3V to 18V input voltages. The switching frequency can be externally adjusted between 250kHz and 500kHz, allowing for flexible performance in different applications. The device also features a soft start feature to reduce inrush current and a current limit for protection.