STMicroelectronics STLQ015M15R

Overview

STLQ015M15R from STMicroelectronics is a 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, delivering fixed 1.5 V output with ±2% tolerance at 25 °C, 112 mV typical dropout at 150 mA, and 1.4 µA typical quiescent current under full load - designed for microcontroller core supply and sensor biasing in battery-powered portable electronics.

For engineers reviewing the STLQ015M15R datasheet, STLQ015M15R pinout, STLQ015M15R application, or STLQ015M15R equivalent, key selection criteria include shutdown current (1 nA typ.), ceramic capacitor compatibility (1 µF), thermal protection, logic-controlled enable, and operation across –40 °C to 125 °C junction temperature.

Technical Context

The STLQ015M15R employs a P-channel MOSFET pass element with internal reference and error amplifier, enabling stable regulation with minimal input-output differential. Its enable-controlled shutdown path reduces total current to 1 nA by disconnecting internal bias networks and disabling the reference.

Thermal foldback and constant-current short-circuit limiting are implemented via on-die sensing; the device maintains regulation over input voltages from 1.5 V to 5.5 V and supports output capacitors from 0.47 µF to 10 µF with ESR between 0.056 Ω and 6 Ω.

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 ECOPACK2 grade.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Compared with XC6219B152MR-G and MIC5205-1.5YM5, the STLQ015M15R uniquely combines sub-µA quiescent current, integrated thermal shutdown, and 1 nA OFF-mode draw - making it optimal for thermally isolated, long-duration battery systems where reliability and runtime are co-prioritized.

Availability

STLQ015M15R is available at Aetrix Electronics and suitable for mobile phone subsystems, digital still camera sensor biasing, and portable medical wearables requiring stable component supply with guaranteed long-term manufacturability.

Supply support for STLQ015M15R 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 battery-constrained applications demanding nanoscale shutdown current and extended temperature operation without sacrificing output accuracy or transient response.

FAQ

What is the minimum input voltage required for regulation at 150 mA load?

The STLQ015M15R maintains regulation down to 1.55 V input at 150 mA load and 25 °C, per Table 4 of DS6765 Rev 7. At –40 °C, minimum VIN rises to 1.55 V; at 125 °C, it remains 1.55 V. Below this, dropout behavior occurs - output drops linearly with input.

Can the STLQ015M15R be used with a 0.47 µF ceramic output capacitor?

Yes - the device is stable with output capacitance as low as 0.47 µF, provided ESR stays within 0.056 Ω to 6 Ω (Figure 15). A 0.47 µF X7R 0603 capacitor meets this requirement and reduces PCB area in space-constrained designs.

Does the NC pin require any PCB routing or grounding?

No - Pin 4 is internally unconnected. ST recommends leaving it floating or connecting it to GND only if required for mechanical stability or thermal relief; no electrical function is associated with this terminal.

How does the enable pin behave during power-up sequencing?

The EN pin has 1 nA input leakage and requires ≥0.7×VIN to assert. With slow-rising VIN (e.g., from charging capacitor), turn-on delay is 160 µs after EN crosses threshold (Table 4). No external pull-up is needed - internal bias ensures defined state at power-on reset.