STMicroelectronics STLQ015M25R

Overview

STLQ015M25R from STMicroelectronics is a 2.5 V, 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, designed for battery-powered systems requiring extended standby life. It delivers ±2% output voltage accuracy at 25 °C, features 112 mV typical dropout at 150 mA, and operates from 1.5 V to 5.5 V input with logic-controlled shutdown.

For engineers reviewing the STLQ015M25R datasheet, STLQ015M25R pinout, STLQ015M25R application, or STLQ015M25R equivalent, key selection criteria include sub-2 µA quiescent current across temperature, ceramic-capacitor compatibility (1 µF), thermal/overcurrent protection, and enable-controlled 1 nA OFF-mode current - critical for portable medical sensors and always-on IoT nodes.

Technical Context

This LDO employs a P-channel MOSFET pass element with internal voltage reference, enabling low dropout and stable regulation down to 0.8 V output. Its enable input directly controls the pass transistor gate via internal logic, supporting fast 160 µs turn-on time and precise 0.4 V logic-low / 0.7 V logic-high thresholds.

Thermal shutdown activates at 170 °C with 15 °C hysteresis, and short-circuit protection limits output current to 250–350 mA. The device maintains stability with 0.47–10 µF ceramic output capacitors having ESR between 0.056 Ω and 6 Ω, verified per Figure 15 of DS6765 Rev 7.

Key Specifications

Pinout & Package

SOT23-5L package: 2.95 mm × 1.60 mm × 1.45 mm body height, 0.95 mm pitch, ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR and MIC5205-2.5YM5, STLQ015M25R uniquely combines 1.4 µA IQ, integrated enable, and 112 mV dropout - delivering optimal energy efficiency for battery-constrained edge nodes where every nanoamp impacts field deployment duration.

Availability

STLQ015M25R is available at Aetrix Electronics and suitable for portable medical monitors, industrial wireless sensors, smart home controllers, and Bluetooth audio accessories requiring stable component supply over extended product lifecycles.

Supply support for STLQ015M25R 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 belongs to ST's ultra-low-power LDO portfolio, engineered specifically for energy-harvesting and battery-operated applications demanding nanoscale quiescent current and robust thermal reliability.

FAQ

What is the minimum input voltage required to maintain 2.5 V output at 150 mA load?

The minimum input voltage is 2.612 V, calculated from the typical 112 mV dropout voltage (2.5 V + 0.112 V). At −40 °C to +125 °C, maximum dropout rises to 300 mV, requiring ≥2.8 V input for full-load regulation. This ensures reliable operation across temperature extremes in automotive and industrial deployments.

Can STLQ015M25R be used with a 0.47 µF ceramic output capacitor?

Yes - the device is stable with output capacitors from 0.47 µF to 10 µF, provided ESR remains between 0.056 Ω and 6 Ω at 100 kHz (per Figure 15). A 0.47 µF X7R capacitor meets these criteria and reduces solution size, though 1 µF is recommended for optimal transient response in dynamic loads like BLE radio bursts.

Does the NC pin require any PCB layout consideration?

Pin 4 (NC) is internally unconnected and must not be soldered to any net. ST recommends leaving it floating or connecting it to GND via a separate copper pour to minimize parasitic coupling - but never routing signal traces or vias to it, as this may induce noise into the sensitive feedback path.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 170 °C, thermal shutdown disables the pass transistor, dropping output to near zero. After 15 °C hysteresis (cooling to ≤155 °C), the device automatically recovers without external intervention. This cycle repeats under continuous overload, protecting against permanent damage while maintaining system-level fault resilience.