LK115D33-TR

Overview

The LK115D33-TR is a fixed-output linear voltage regulator from STMicroelectronics, providing a nominal 3.3 V output with a maximum load current of 100 mA. It operates within an input voltage range up to 20 V and features a typical dropout voltage of 0.17 V at 60 mA. The device incorporates two logic-controlled shutdown pins for power management, achieving a quiescent current as low as 0.01 µA in the off state. It includes internal thermal overload and short-circuit protection, ensuring stability with a minimum output capacitance of 2.2 µF.

Feature Summary

• Dual logic-controlled electronic shutdowns allow independent control via active high or active low signals to minimize standby power consumption.
• Very low dropout voltage capability ensures efficient regulation even when the input-to-output differential is minimal.
• Integrated thermal limit and current limit protection mechanisms safeguard the device against overheating and overcurrent conditions.

Applications

• Battery-powered portable systems requiring ultra-low standby current
• Low noise analog circuitry powered by regulated supply rails
• Embedded microcontroller boards utilizing local voltage regulation

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package integrity and pin alignment upon receipt. Ensure storage conditions comply with moisture sensitivity level requirements before soldering. Review the official datasheet for absolute maximum ratings to prevent operational damage during integration.

Selection Notes

Select this regulator for applications demanding precise 3.3 V generation with minimal power loss. Evaluate the input voltage headroom against the specified dropout characteristics to maintain regulation. Consider the dual shutdown feature if system-level power sequencing or deep sleep modes are required. Verify that the external capacitor meets the equivalent series resistance specifications for loop stability.

Part Context

This component belongs to the LK115XX family of very low drop regulators manufactured by STMicroelectronics. The series offers fixed output voltages including 3.0 V, 3.3 V, and 5.0 V variants. These devices are designed for space-constrained designs using the SO-8 package and are suitable for industrial temperature ranges.

Replacement Considerations

LK115D30-TR (3.0 V Output)

FAQ

How does the LK115D33-TR handle shutdown states?

It features two dedicated shutdown pins allowing control via either active high or active low logic levels to reduce quiescent current significantly.

What is the minimum output capacitance required for stability?

The device requires a minimum output bypass capacitance of 2.2 µF with an equivalent series resistance between 0.5 Ω and 10 Ω.