STMicroelectronics STLQ015XG15R

Overview

STLQ015XG15R from STMicroelectronics is a 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, delivering 1.5 V output with ±2% accuracy at 25 °C, 1.4 µA typical quiescent current at full load, and 1 nA shutdown current. It operates from 1.5 V to 5.5 V input, features logic-controlled enable, internal thermal/current protection, and stable operation with 1 µF ceramic output capacitor - deployed in battery-powered microcontroller power rails requiring multi-year standby life.

For engineers reviewing the STLQ015XG15R datasheet, STLQ015XG15R pinout, STLQ015XG15R application, or STLQ015XG15R equivalent, key selection criteria include guaranteed 150 mA output under 112 mV dropout, sub-µA quiescent behavior across temperature, EN-controlled shutdown, ceramic-capacitor compatibility, and -40 °C to 125 °C junction operation for portable sensor nodes and wearables.

Technical Context

The STLQ015XG15R implements a P-channel MOSFET pass element with precision bandgap reference and error amplifier, enabling low-dropout regulation with minimal bias current. Its enable circuitry uses CMOS-level thresholds (VEN_H ≥ 0.7×VIN, VEN_L ≤ 0.4×VIN) and delivers 160 µs turn-on time to 95% of nominal output.

Thermal protection activates at 170 °C with 15 °C hysteresis; short-circuit current is internally limited to 250–350 mA. Output noise is 75 µVRMS (10–100 kHz), and supply voltage rejection reaches 40 dB at 1 kHz - critical for noise-sensitive analog sensor front-ends powered from shared battery rails.

Key Specifications

Pinout & Package

STLQ015XG15R is housed in a RoHS-compliant, ECOPACK®-qualified SOT23-5L package (2.95 mm × 1.60 mm × 1.45 mm height), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B152MR-G and ADP160ACBZ-1.5-R7, STLQ015XG15R uniquely combines EN control, 1 nA shutdown, SOT23-5L manufacturability, and full -40 °C to 125 °C specification - making it optimal for thermally demanding, firmware-managed battery systems.

Availability

STLQ015XG15R is available at Aetrix Electronics and suitable for battery-powered wireless sensor nodes, wearable health monitors, industrial temperature transmitters, and smart meter RTC supplies requiring stable component supply across extended product lifecycles.

Supply support for STLQ015XG15R 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, and embedded applications.

The STLQ015 series belongs to ST's ultra-low-power linear regulator portfolio, engineered specifically for energy-constrained portable and sensor-edge devices where multi-year battery life and thermal resilience are primary design constraints.

FAQ

What is the minimum input voltage required for regulation at 1.5 V output?

The STLQ015XG15R requires a minimum input voltage of 1.55 V at 150 mA load and -40 °C to 125 °C junction temperature, per electrical characteristics Table 4. At room temperature and light load, regulation begins at 1.5 V input, but 1.55 V ensures guaranteed 150 mA output across full temperature and load range.

Can STLQ015XG15R operate with a 0.47 µF output capacitor?

Yes - the datasheet specifies stable operation with output capacitance from 0.47 µF to 10 µF, provided ESR remains between 0.056 Ω and 6 Ω. A 0.47 µF X5R ceramic capacitor meets these requirements and is validated in Figure 15 (COUT stability region) for all output voltages including 1.5 V.

Is the NC pin (Pin 4) required to be left floating, or may it be grounded?

Pin 4 is internally unconnected and must remain electrically floating - grounding or pulling it high or low may cause unpredictable behavior or increased leakage. The datasheet explicitly states "Not connected" in Table 1 and prohibits external connection in layout guidelines.

How does thermal shutdown hysteresis affect system recovery after an overtemperature event?

When junction temperature reaches 170 °C, thermal shutdown disables the regulator; hysteresis of 15 °C means the device re-enables only after temperature falls to 155 °C. This prevents oscillatory cycling during sustained overload and allows safe cooldown before resuming regulation, protecting downstream loads and PCB traces.