STMicroelectronics LD39015XG10R

Overview

LD39015XG10R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator in SOT23-5L package, delivering fixed 1.0 V output with ±2.0% accuracy at 25 °C, 80 mV typical dropout at 100 mA, and 29 µVRMS output noise (1.1–100 kHz) without bypass capacitor - designed for power-sensitive RF and analog subsystems in portable electronics.

For engineers reviewing the LD39015XG10R datasheet, LD39015XG10R pinout, LD39015XG10R application, or LD39015XG10R equivalent, key selection criteria include guaranteed 150 mA load capability, logic-controlled shutdown (<1 µA OFF current), ceramic-capacitor stability (1 µF COUT), -40 °C to 125 °C operation, and ultra-low noise performance critical for ADC reference, PLL supply, and sensor signal chains.

Technical Context

The LD39015XG10R employs a bandgap-referenced error amplifier with internal trimming for precise 1.0 V output regulation, integrated thermal and short-circuit protection, and enable-controlled NMOS pass transistor architecture enabling fast 30 µs turn-on time and sub-1 µA shutdown current. Its feedback loop is optimized for stability with 1 µF ceramic output capacitors across the full operating temperature range.

Supply voltage rejection is 65 dB at 1 kHz but rolls off above 10 kHz (62 dB at 10 kHz), while output noise remains flat at 29 µVRMS (1.1–100 kHz) due to internal noise filtering - making it suitable for noise-sensitive analog rails where external bypassing is impractical.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.45 mm × 1.60 mm footprint, 0.95 mm pitch, 0.6 mm max height, ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with XC6206P102MR and RT9013-10GB, the LD39015XG10R uniquely combines ultra-low noise (29 µVRMS), sub-1 µA shutdown, and 80 mV dropout - making it optimal for noise-critical, battery-constrained applications where enable control and wide input range are mandatory.

Availability

LD39015XG10R is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, low-power MCU subsystems, and industrial transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD39015XG10R 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 microcontrollers, power management ICs, sensors, and analog components for automotive, industrial, and consumer markets.

The LD39015 series belongs to ST's high-performance LDO portfolio, engineered specifically for ultra-low-power, low-noise applications in battery-powered portable and industrial equipment where efficiency, precision, and reliability are non-negotiable.

FAQ

What is the minimum input voltage required for the LD39015XG10R to regulate 1.0 V output?

The LD39015XG10R requires VIN ≥ VOUT + VDROP to maintain regulation. With 80 mV typical dropout at 100 mA, the minimum functional input is 1.08 V. However, the absolute minimum specified operating input is 1.5 V per datasheet - below which regulation, PSRR, and noise performance are not guaranteed.

Can the LD39015XG10R be used with a 1 µF ceramic output capacitor only?

Yes - the LD39015XG10R is explicitly characterized and guaranteed stable with a 1 µF X5R/X7R ceramic capacitor (ESR <2.4 Ω). No additional bulk capacitance or ESR tuning is required, simplifying layout and reducing bill-of-materials cost.

Does the LD39015XG10R require an input capacitor?

Yes - a 1 µF ceramic input capacitor is recommended and required for stability and transient response. It must be placed within 2 mm of the IN and GND pins to minimize parasitic inductance and prevent oscillation under load steps.

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

The EN pin has TTL-compatible thresholds: logic high (>0.9 V) enables regulation; logic low (<0.4 V) forces shutdown. With no pull-up, EN floats high by default - but for controlled sequencing, a dedicated pull-up to VIN or system controller GPIO is recommended to avoid undefined startup states.