STMicroelectronics LD39015M08R

Overview

LD39015M08R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator delivering fixed 0.8 V output with ±2.0% tolerance at 25 °C, 80 mV typical dropout at 100 mA, and 29 µV_RMS output noise (1.1–100 kHz) without bypass capacitor-designed for power-sensitive battery-operated systems such as mobile phone baseband processors.

For engineers reviewing the LD39015M08R datasheet, LD39015M08R pinout, LD39015M08R application, or LD39015M08R equivalent, key selection criteria include guaranteed 150 mA load capability at 0.8 V, logic-controlled shutdown (<1 µA OFF current), SOT23-5L package compatibility with 1 µF ceramic output capacitors, and operation across –40 °C to 125 °C junction temperature.

Technical Context

The LD39015M08R employs a bandgap reference trimmed to 1.22 V and internal resistor divider to regulate 0.8 V output. Its enable-controlled NMOS pass transistor architecture enables fast 30 µs turn-on time and sub-1 µA shutdown current.

Stability is ensured with ≥1 µF ceramic output capacitance (ESR < 2.4 Ω), while thermal shutdown (160 °C) and short-circuit current limiting (350 mA) provide robust protection under fault conditions across its 1.5–5.5 V input range.

Key Specifications

Pinout & Package

SOT23-5L surface-mount package (3.0 × 1.6 × 1.3 mm, 5-pin, ECOPACK® compliant) with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B082MR-G and RT9013-12GB, the LD39015M08R uniquely combines 0.8 V output, 150 mA capability, enable control, and ultra-low noise in a single SOT23-5L package-making it optimal for space-constrained, battery-powered 0.8 V core supplies where both precision and power efficiency are critical.

Availability

LD39015M08R is available at Aetrix Electronics and suitable for mobile baseband power, wearable sensor hubs, Bluetooth LE audio modules, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LD39015M08R 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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The LD39015 series belongs to ST's high-performance LDO portfolio targeting ultra-low-power, low-noise portable electronics-specifically engineered to replace legacy regulators in battery-critical applications demanding minimal quiescent current and exceptional noise performance.

FAQ

What is the minimum input voltage required for regulation at 0.8 V output?

The LD39015M08R requires VIN ≥ VOUT + VDROP to maintain regulation. With 80 mV typical dropout at 100 mA, the minimum functional input is 0.88 V. However, the absolute minimum specified operating input is 1.5 V per datasheet Section 4 - below this, the device may not meet electrical characteristics or remain enabled reliably.

Can the LD39015M08R be used with a 0.47 µF output capacitor?

No. The datasheet specifies a minimum 1 µF ceramic output capacitor for stability (Figure 7, Table 5). Using 0.47 µF violates the stability region and risks oscillation or poor transient response, especially under load steps. The recommended COUT range is 1–22 µF with ESR < 2.4 Ω at 100 kHz.

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

Pin 4 is internally unconnected and must remain electrically floating. ST's layout guidelines advise against connecting it to GND or any net - doing so may compromise thermal performance or induce parasitic coupling. It should be left un-routed or covered with solder mask.

How does the LD39015M08R behave during thermal shutdown?

When junction temperature reaches 160 °C, the device disables the pass transistor and forces output to 0 V while drawing <1 µA. It remains latched off until temperature falls by ≥20 °C (hysteresis), then automatically resumes regulation if EN is high and input conditions are valid - no external reset is needed.