STMicroelectronics LK112M60TR

Overview

LK112M60TR from STMicroelectronics is a low-noise, low-dropout linear voltage regulator with integrated shutdown control and 6.0 V fixed output. It delivers up to 150 mA, maintains 350 mV dropout at full load, achieves 30 µV_rms output noise (10 Hz–80 kHz), and draws only 250 µA quiescent current in ON mode-ideal for battery-powered sensor nodes and precision analog front-ends.

For engineers reviewing the LK112M60TR datasheet, LK112M60TR pinout, LK112M60TR application, or LK112M60TR equivalent, key selection criteria include its SOT23-5L package footprint, TTL/CMOS-compatible SHDN pin, 0.1 µF bypass capacitor requirement for noise reduction, and thermal/current protection behavior under overloads.

Technical Context

The LK112M60TR uses an internal PNP pass transistor to achieve low dropout and high PSRR (55 dB at 400 Hz). Its shutdown function reduces quiescent current to ≤0.1 µA when SHDN is pulled below 0.6 V, enabling ultra-low-power sleep states in portable systems.

It integrates thermal shutdown (trip at <150 °C) and current limiting (150 mA typical), with line regulation of 0.8–40 mV across input range and load regulation of 15–90 mV from 1–150 mA-ensuring stable 6.0 V output under dynamic load and supply variations.

Key Specifications

Pinout & Package

The LK112M60TR is housed in a compact SOT23-5L package (2.95 mm × 1.60 mm × 1.45 mm), optimized for thermal dissipation via internal die-attach flag connection to GND pin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO regulator applications.

Compared with AP2210K-6.0TRG1 and MCP1703T-6002E/MB, the LK112M60TR uniquely combines sub-0.4 V dropout, 30 µV_rms noise with bypass pin, and <0.1 µA shutdown-making it optimal for ultra-low-power, high-fidelity analog systems where all three traits are simultaneously required.

Availability

LK112M60TR is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial analog signal chains, portable medical monitors, and test & measurement front-ends requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LK112M60TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The LK112 series belongs to ST's precision linear regulator product line, engineered specifically for ultra-low-noise, low-quiescent-current applications in battery-constrained and signal-integrity-sensitive systems.

FAQ

What is the minimum input voltage required for regulation at 6.0 V output?

The LK112M60TR requires a minimum input voltage of V_OUT + 0.5 V = 6.5 V for stable regulation, per ST's datasheet specification for devices with V_OUT > 2 V. Below this threshold, dropout behavior begins and output voltage drops linearly with input.

Can the Bypass pin be left unconnected?

No-the Bypass pin must be connected to a 0.1 µF ceramic capacitor to ground to achieve the specified 30 µV_rms output noise. Leaving it open increases noise to ~120 µV_rms, degrading performance in noise-sensitive analog circuits.

Does the LK112M60TR include reverse-voltage protection?

Yes-the device incorporates internal reverse-current blocking between IN and OUT pins, preventing backfeed when input falls below output voltage. This eliminates need for external reverse-polarity diodes in most applications.

How does thermal shutdown behave during sustained overload?

When junction temperature exceeds ~150 °C, the LK112M60TR disables output and holds shutdown until temperature falls below ~135 °C hysteresis threshold. Recovery is automatic and does not require cycling SHDN-enabling robust fault recovery in enclosed enclosures.