STMicroelectronics STLQ015M20R

Overview

STLQ015M20R from STMicroelectronics is a 2.0 V fixed-output, 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package. It operates from 1.5 V to 5.5 V input, delivers ±2% output accuracy at 25 °C, features 112 mV typical dropout at full load, and supports logic-controlled shutdown with 1 nA OFF-mode current. It powers microcontroller cores and sensors in battery-constrained portable systems.

For engineers reviewing the STLQ015M20R datasheet, STLQ015M20R pinout, STLQ015M20R application, or STLQ015M20R equivalent, key selection criteria include quiescent current behavior across temperature/load, ceramic-capacitor stability (1 µF COUT), thermal/overcurrent protection, and enable-input logic thresholds for low-power sequencing.

Technical Context

This LDO employs a P-channel MOSFET pass element enabling near-zero dropout at light loads and stable operation with low-ESR ceramic capacitors. Its bandgap reference and internal resistor divider set the 2.0 V output with ±2% tolerance at room temperature and ±3% over –40 °C to 125 °C.

The device integrates thermal shutdown (170 °C trip, 15 °C hysteresis) and constant-current short-circuit limiting (~300 mA). Enable control uses TTL-compatible thresholds: VEN < 0.4 V disables the regulator, reducing total supply current to 1 nA (typ.), while VEN > 0.7 V enables regulation with 160 µs turn-on time.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P202MR and ADP160ACBZ-2.0-R7, STLQ015M20R uniquely balances 1.4 µA loaded IQ, integrated thermal/short-circuit protection, and SOT23-5L compactness-making it optimal for space-constrained, long-life, safety-aware portable medical and industrial endpoints.

Availability

STLQ015M20R is available at Aetrix Electronics and suitable for wearable health monitors, industrial wireless sensor nodes, smart meter RTC backup systems, and portable medical glucometers requiring stable component supply with guaranteed long-term availability.

Supply support for STLQ015M20R 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 family, engineered specifically for battery-operated devices demanding nanoscale shutdown current, wide input range, and ceramic-capacitor simplicity in minimal footprints.

FAQ

What is the minimum input voltage required to maintain 2.0 V output at 150 mA load?

The STLQ015M20R requires VIN ≥ 2.112 V (2.0 V + 112 mV dropout) to sustain regulation at full 150 mA load. At lower input voltages, output collapses linearly; the absolute minimum VIN is 1.5 V, but regulation is only guaranteed above the dropout threshold. This enables use with partially discharged single-cell Li-ion (≥3.0 V) or two-alkaline (≥3.2 V) sources.

Can STLQ015M20R operate stably with a 0.47 µF ceramic output capacitor?

Yes-ST's DS6765 specifies 0.47 µF as the minimum stable ceramic output capacitance (X5R/X7R, ESR 0.056–6 Ω). The device's internal compensation is optimized for this range, and Figure 15 confirms stability down to 0.47 µF. Using smaller values risks oscillation; larger values (up to 10 µF) improve transient response without instability.

How does the enable pin behave under fast voltage transitions?

The EN pin has 1 nA input leakage (max) and TTL-compatible thresholds: logic low ≤0.4 V, logic high ≥0.7 V. With 160 µs turn-on time (measured from VEN crossing 0.7 V to VOUT reaching 95% of 2.0 V), it supports clean power sequencing in microcontroller-driven systems. No external pull-up/down is required unless noise immunity in high-EMI environments is needed.

Is STLQ015M20R qualified for automotive applications?

While rated for –40 °C to +125 °C junction temperature and featuring automotive-grade thermal shutdown (170 °C trip), STLQ015M20R is not AEC-Q100 qualified. It is intended for industrial and consumer portable equipment. For automotive cabin or engine bay use, ST recommends the pin-compatible AEC-Q100 qualified STLQ020 series (e.g., STLQ020M20R) with identical electrical specs and enhanced reliability testing.