STMicroelectronics STLQ015XG12R

Overview

STLQ015XG12R from STMicroelectronics is a 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, delivering 1.2 V output with ±2% accuracy at 25 °C, 112 mV typical dropout at 150 mA, and 1.4 µA quiescent current under full load - designed for microcontroller core supply in battery-constrained portable systems.

For engineers reviewing the STLQ015XG12R datasheet, STLQ015XG12R pinout, STLQ015XG12R application, or STLQ015XG12R equivalent, key selection criteria include shutdown current (≤200 nA at 125 °C), ceramic capacitor compatibility (1 µF min), logic-controlled enable, thermal protection, and operation across –40 °C to 125 °C junction temperature.

Technical Context

This LDO employs a P-channel MOSFET pass element enabling ultra-low IQ via optimized biasing and integrated shutdown control. Its internal current limiting and thermal shutdown (170 °C trip, 15 °C hysteresis) ensure robustness under fault conditions without external components.

The regulator maintains stability with 0.47–10 µF ceramic output capacitors (ESR 0.056–6 Ω), achieves 40 dB PSRR at 1 kHz, and delivers 75 µVRMS output noise (10–100 kHz) - critical for low-noise analog and RF subsystems powered from the same battery rail.

Key Specifications

Pinout & Package

SOT23-5L package: 2.95 mm × 1.60 mm × 1.30 mm body, 0.95 mm pitch, exposed pad not electrically connected, RoHS-compliant ECOPACK®2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B122MR-G and RP111N121D-TR-F, STLQ015XG12R uniquely combines active-high enable, 1 nA shutdown, and 1.4 µA loaded IQ in a single SOT23-5L footprint - simplifying design for battery-gated systems requiring precise timing of power-up sequences.

Availability

STLQ015XG12R is available at Aetrix Electronics and suitable for wearable health monitors, smart meter sensor nodes, industrial wireless sensors, and portable medical diagnostic devices requiring stable component supply with guaranteed long-term availability.

Supply support for STLQ015XG12R 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 products for automotive, industrial, power management, and microcontroller markets.

The STLQ015 series belongs to ST's ultra-low-power linear regulator product line, engineered specifically for energy-harvesting and battery-operated applications where multi-year operational lifetime and minimal standby leakage are mandatory design requirements.

FAQ

What is the minimum input voltage required for regulation at 1.2 V output?

The STLQ015XG12R requires VIN ≥ 1.312 V to maintain regulation (112 mV dropout + 1.2 V), verified across –40 °C to 125 °C. At 1.5 V input, it delivers full 150 mA with margin; operation below 1.5 V is permitted but reduces available output current due to internal headroom limits.

Can the STLQ015XG12R be used with a 0.47 µF ceramic output capacitor?

No - the datasheet specifies a minimum COUT of 0.47 µF only for stability analysis; the recommended minimum is 1 µF (±20%). Using 0.47 µF risks instability and oscillation, especially under transient load steps. Always use ≥1 µF X5R/X7R ceramic capacitor with ESR between 0.056 Ω and 6 Ω.

Does the NC pin (Pin 4) require any PCB routing or grounding?

Pin 4 (NC) is internally unconnected and must remain unconnected on the PCB. It may be left floating or tied to GND for mechanical stability - ST recommends grounding it to reduce potential EMI coupling, but no electrical function is affected either way.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches 170 °C, the device shuts down output and enters thermal protection mode. After cooling by ≥15 °C (to ≤155 °C), it automatically recovers and resumes regulation - no external reset or enable toggling is needed, ensuring autonomous fault recovery in sealed enclosures.