STMicroelectronics STLQ015M28R

Overview

STLQ015M28R from STMicroelectronics is a 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, delivering fixed 2.8 V output with ±2% tolerance at 25 °C, 112 mV typical dropout at 150 mA, and 1.4 µA typical quiescent current under full load - optimized for battery-powered microcontroller and sensor power rails in portable electronics.

For engineers reviewing the STLQ015M28R datasheet, STLQ015M28R pinout, STLQ015M28R application, or STLQ015M28R equivalent, this page delivers verified electrical specs, thermal behavior, enable-controlled shutdown performance (1 nA OFF current), ceramic-capacitor stability (1 µF COUT), and real-world use context for low-power embedded system design.

Technical Context

The STLQ015M28R employs a P-channel MOSFET pass element enabling ultra-low dropout and nanoscale shutdown current. Its internal reference and error amplifier maintain tight output regulation across -40 °C to 125 °C while supporting logic-controlled EN input with 0.4 V logic-low threshold and 0.7 V logic-high threshold.

It integrates short-circuit constant-current limiting (250–350 mA) and thermal shutdown (170 °C with 15 °C hysteresis), and achieves 40 dB supply voltage rejection at 1 kHz for 0.8 V output - critical for noise-sensitive analog and RF subsystems powered from shared battery rails.

Key Specifications

Pinout & Package

SOT23-5L package: 2.95 mm × 1.60 mm × 1.45 mm body height, 0.95 mm pitch, ECOPACK® compliant, tape-and-reel packaging (3,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-IQ LDO applications.

Compared with XC6219B282MR and RT9013-28GB, the STLQ015M28R uniquely combines sub-1.5 µA full-load IQ, true 1 nA shutdown, 1.5 V minimum input, and robust 6 Ω ESR stability - making it the only option for long-life coin-cell designs requiring deep-sleep autonomy and wide-input flexibility.

Availability

STLQ015M28R is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, portable medical devices, and industrial control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for STLQ015M28R 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The STLQ015 series targets ultra-low-power battery-operated systems, emphasizing nanoscale quiescent current, wide input range, and integrated protection - directly addressing design constraints in IoT edge nodes and portable medical electronics.

FAQ

What is the minimum input voltage required for 2.8 V output regulation at 150 mA?

The STLQ015M28R maintains regulation down to 2.912 V input (2.8 V + 112 mV dropout) at 150 mA and 25 °C. At -40 °C to 125 °C, maximum dropout rises to 300 mV, requiring ≥3.1 V input for full-load operation across temperature. Below 1.5 V input, the device ceases regulation entirely per absolute maximum ratings.

Can the STLQ015M28R be used with a 0.47 µF ceramic output capacitor?

No - the datasheet specifies a minimum 0.47 µF capacitance but mandates 1 µF for guaranteed stability across all operating conditions. Figure 15 shows the 1 µF point lies within the stable ESR region (0.056–6 Ω); using 0.47 µF risks oscillation due to insufficient phase margin, especially at high temperatures or light loads.

How does the EN pin behave during power-up when VIN ramps slowly?

The EN pin has no internal pull-up or pull-down; it must be actively driven. If left floating during VIN ramp, the regulator may power up unpredictably due to noise coupling. ST recommends tying EN to VIN through a 100 kΩ resistor for automatic turn-on, or driving it from a GPIO with controlled timing to avoid brown-out during startup.

Is thermal shutdown reversible without cycling VIN?

Yes - thermal shutdown is fully autonomous and self-resetting. When junction temperature exceeds 170 °C, the device shuts down output and enters thermal protection mode. Once temperature falls by ≥15 °C (hysteresis), regulation resumes automatically without requiring EN toggling or VIN interruption.