STMicroelectronics STLQ015M30R

Overview

STLQ015M30R from STMicroelectronics is an ultra-low-quiescent-current linear voltage regulator delivering 150 mA output at 3.0 V with input range 1.5–5.5 V, 112 mV typical dropout, ±2% output tolerance at 25 °C, and logic-controlled shutdown. It powers microcontroller cores and sensors in battery-constrained portable systems requiring multi-year standby life.

For engineers reviewing the STLQ015M30R datasheet, STLQ015M30R pinout, STLQ015M30R application, or STLQ015M30R equivalent, key selection criteria include shutdown current (1 nA typ.), ceramic capacitor compatibility (1 µF), thermal/overcurrent protection, and SOT23-5L footprint constraints for space-limited PCBs.

Technical Context

This LDO employs a P-channel MOSFET pass element enabling low dropout and near-zero gate drive current, directly contributing to its 1.4 µA quiescent current at full 150 mA load. Internal bandgap reference and error amplifier maintain ±2% output accuracy across –40 °C to 125 °C.

The enable input (EN) controls NMOS-driven shutdown, reducing total supply current to 1 nA typ. Short-circuit constant-current limiting and thermal shutdown (170 °C, 15 °C hysteresis) operate independently of EN state, ensuring robust fault handling during active or standby modes.

Key Specifications

Pinout & Package

SOT23-5L package: 2.95 mm × 1.60 mm × 1.45 mm body height, 0.95 mm pin pitch, thermally enhanced pad-less construction suitable for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P302MR and RT9013-30GB, STLQ015M30R uniquely combines 1.4 µA active I_Q, 1 nA shutdown, integrated thermal protection, and 1 µF ceramic stability - making it the only option meeting stringent 10-year coin-cell lifetime and safety requirements in medical wearables.

Availability

STLQ015M30R is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, portable medical dataloggers, and energy-harvesting remote controllers requiring stable component supply with long-term lifecycle assurance.

Supply support for STLQ015M30R 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 portable electronics, specifically engineered to maximize battery life in always-on, intermittently active devices such as wearables and wireless sensors.

FAQ

What is the minimum input voltage required for 3.0 V output at 150 mA?

The minimum input is 3.112 V, calculated from the 112 mV typical dropout voltage at 150 mA load. At elevated temperatures up to 125 °C, dropout rises to 300 mV, requiring ≥3.3 V input for guaranteed regulation. This ensures reliable operation across full industrial temperature range and battery discharge profiles.

Can STLQ015M30R be used with a 0.47 µF output capacitor?

No - the datasheet specifies a minimum 0.47 µF capacitance but requires ESR between 0.056 Ω and 6 Ω for stability. A 0.47 µF ceramic capacitor typically has ESR < 0.01 Ω, risking oscillation. Use 1 µF X5R/X7R MLCC (ESR ~0.1 Ω) as validated in Figure 15's stability region.

How does the NC pin affect PCB layout?

Pin 4 is internally unconnected and must remain electrically floating - no trace, pad, or solder mask opening is required. Leaving it unconnected avoids parasitic coupling and simplifies routing in dense SOT23-5L layouts, unlike exposed thermal pads that demand specific copper pour rules.

Is thermal shutdown latched or auto-recovering?

Thermal shutdown is auto-recovering with 15 °C hysteresis: the device shuts down at 170 °C and resumes regulation once junction temperature falls below 155 °C. This prevents thermal runaway during transient overloads while avoiding manual reset requirements in sealed enclosures.