Overview of the L4978 2A Step Down Switching Regulator
The L4978 is a monolithic power switching regulator designed for step down conversion, delivering up to 2A with an adjustable output voltage ranging from 3.3V to 50V. It supports an operating input voltage from 8V to 55V and features a precise 3.3V (+1%) internal reference voltage. The switching frequency is adjustable up to 300KHz, facilitating efficient and high-speed switching performance to meet the demands of various applications.
Key Features
- Operating input voltage from 8V to 55V.
- Output voltage adjustable between 3.3V to 50V.
- Switching frequency can be adjusted up to 300KHz.
- Voltage feedforward and zero load current operation for enhanced regulation.
- Includes internal current limiting features, such as pulse-by-pulse and hiccup mode, for improved protection.
- Inhibiting functionality for reducing consumption to zero current.
- Protection against feedback disconnection and thermal shutdown.
- A soft start function to mitigate initial power surges.
Applications and Implementation
The versatile input and output voltage ranges of the L4978 make it suitable for a broad spectrum of applications. With features such as pulse-by-pulse current limiting, short circuit protection through hiccup mode, voltage feedforward regulation, soft-start capability, protection against feedback loop disconnection, and thermal shutdown, the device is well-equipped to handle various operational scenarios.
It is available in different package forms, including the plastic dual-in-line DIP-8 for standard assembly and SO16W for SMD assembly, increasing its adaptability for different installation requirements. Tables and figures showcasing order codes, typical application circuits, block diagrams, and pin connections are included for comprehensive guidance during the device’s integration into electronic circuits.
Protection and Regulation Features
This DC-DC converter module ensures dependable operation with its slew of protective mechanisms. Voltage feedforward regulation and the device’s inherent capability for zero-load current operation enable a stable output even when the load varies or is nonexistent. Integrated safety functionalities combat overheating and the risks posed by electrical anomalies.
Ordering Information and Pin Descriptions
The datasheet provides detailed ordering information, including part numbers for the standard and tape & reel packaging options. A block diagram is also presented, depicting the internal operational architecture, followed by a comprehensive pin description table to assist users in understanding the functionality of each pin and how the regulator can be seamlessly integrated into their setups.
References:
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