L4931 series Very Low Drop Voltage Regulators with Inhibit

Category: Electronics, Regulators, ST Microelectronics Inc

Overview

The L4931 series datasheet introduces a collection of very low drop voltage regulators, offering a significant feature set that makes them ideal for low noise, low power applications, particularly in battery-powered systems. Important characteristics include a dropout voltage of only 0.4V, quiescent current of roughly 50µA when off and 60µA when on, and the ability to support output currents up to 250 mA.

Standout Features

The regulators are not only efficient in their power consumption but are also user-friendly with logic-controlled electronic shutdown, facilitating a reduction in total power consumption via a standby mode. Complementing this feature is the availability of a Shutdown Logic Control function that is TTL compatible, offered in PPAK and SO-8 packages. To enhance stability, only a 2.2µF capacitor is required, which leads to savings in both space and cost.

Technical Specifications and Packaging

Output voltages provided by the L4931 series vary widely, allowing choices between 1.5V up to 12V. The series boasts exceptional supply voltage rejection (70dB typical for the 5V version) and comes with an internal current and thermal limit for added protection. Users can select from a precision of either ±1% (AB) or ±2% (C) at 25°C.

The regulators are available in several different package types, including TO-220, TO-92, PPAK, DPAK, and SO-8, catering to diverse application needs. These regulators are designed to operate within a broad temperature range of -40°C to 125°C, thus ensuring reliability across various environmental conditions.

Applications and Uses

Because of their low power consumption and voltage drop, the L4931 series regulators are particularly suitable for applications where noise reduction and energy efficiency are paramount. The presence of an inhibit control feature additionally aids in energy management by allowing parts of a device or electronic board to enter standby mode, further decreasing power usage.

Reliability and Stability

The L4931 series regulators emphasize reliability with built-in current and thermal limit protection, ensuring safe operation under a range of conditions. Also mentioned is the requirement for only a minimal capacity capacitor to achieve stability, showcasing the regulators’ compatibility with compact and cost-effective designs.

Version Information and Availability

This datasheet, denoted by the reference number CS12740 and revision number 12, was made available in June 2006 and can be found on the manufacturer’s website.