LK112SM27TR

Overview

The LK112SM27TR is a low-dropout linear voltage regulator manufactured by STMicroelectronics, belonging to the LK112S series. It provides a fixed output voltage of 2.7 V with a maximum output current capability of 200 mA. The device operates within an input voltage range from 3.2 V to 14 V and features a maximum dropout voltage of 500 mV at full load. Quiescent current is specified at a maximum of 250 μA in the ON state. The component utilizes an SOT-23-5 surface-mount package and supports an industrial operating temperature range from -40 °C to +125 °C.

Feature Summary

• Integrated shutdown function controllable via TTL or CMOS logic levels
• Low output noise performance suitable for sensitive analog circuits
• Built-in internal current limiting and thermal protection mechanisms

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Noise-sensitive analog signal conditioning stages
• Industrial control systems operating in harsh thermal environments

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure input voltage remains above the minimum threshold of 3.2 V to maintain regulation. Validate thermal dissipation requirements based on ambient conditions and load current.

Selection Notes

Select this component when a fixed 2.7 V rail is required with moderate current demands up to 200 mA. The SOT-23-5 package offers space efficiency for compact designs. Consider the shutdown pin functionality if system power cycling is necessary. Evaluate the 500 mV dropout characteristic against available supply headroom.

Part Context

This part belongs to the LK112S family of low-dropout regulators featuring shutdown capabilities. Variants within the series differ primarily by their fixed output voltage settings, such as 1.8 V, 2.5 V, 3.3 V, and 5.0 V options. All members share identical pinouts, package types, and core protection features, facilitating design flexibility across different voltage rails.

Replacement Considerations

Direct substitutes include other LK112S variants with different output voltages if the voltage level can be adjusted externally. Cross-reference with similar SOT-23-5 LDOs offering comparable current ratings and dropout characteristics. Verify pin compatibility before swapping with non-ST components.