STMicroelectronics LD39015J12R

Overview

LD39015J12R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator delivering a fixed 1.2 V output with ±2.0% tolerance at 25 °C, 90 mV typical dropout at 100 mA, 54 µV_RMS output noise (10 Hz–100 kHz), and logic-controlled shutdown. It operates from 1.5 V to 5.5 V input and supports ceramic output capacitors as low as 1 µF - ideal for power-sensitive battery-powered systems like mobile handsets and wearables.

For engineers reviewing the LD39015J12R datasheet, LD39012R pinout, LD39015J12R application, or LD39015J12R equivalent, key selection criteria include dropout performance under light-to-moderate load, sub-µA shutdown current, noise-sensitive analog rail requirements, and flip-chip package integration in space-constrained portable designs.

Technical Context

The LD39015J12R employs a bandgap reference and internal trimming network to maintain tight output accuracy across temperature and load. Its enable-controlled shutdown reduces total supply current to ≤1 µA, and built-in thermal and short-circuit protection ensure robust operation without external circuitry.

Designed for stability with 1 µF ceramic output capacitors, it achieves 74 dB PSRR at 1 kHz and maintains ≥67 dB up to 10 kHz. The flip-chip 4-bump construction (1.1 × 1.1 mm) minimizes parasitic inductance and supports high-frequency transient response in compact layouts.

Key Specifications

Pinout & Package

LD39015J12R uses a flip-chip 4-bump package (1.1 × 1.1 mm, 0.65 mm typical height) with solder bumps on the die underside - enabling ultra-low profile mounting and minimal PCB footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B122MR-G and RT9013-12GB, LD39015J12R uniquely balances ultra-low dropout (90 mV), ultra-low noise (54 µV_RMS), and AEC-Q200-compatible temperature range in a 1.1 × 1.1 mm flip-chip package - making it optimal for miniaturized, battery-critical, and thermally demanding applications.

Availability

LD39015J12R is available at Aetrix Electronics and suitable for wearable health sensors, BLE modules, and automotive cabin controllers requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LD39015J12R 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 industrial, automotive, and consumer markets.

The LD39015 series belongs to ST's ultra-low-noise, low-I_Q LDO portfolio - engineered specifically for powering noise-sensitive analog and RF blocks in battery-operated portable and automotive electronics.

FAQ

What is the minimum input voltage required for regulation at 1.2 V output?

The LD39015J12R requires VIN ≥ VOUT + VDROP. With 90 mV typical dropout at 100 mA, regulation is maintained down to ~1.29 V input. Absolute minimum VIN is 1.5 V per datasheet specification, ensuring guaranteed 150 mA output and full parameter compliance across temperature.

Can LD39015J12R be used with a 1 µF ceramic output capacitor?

Yes - the device is explicitly characterized and guaranteed stable with 1 µF X5R/X7R ceramic capacitors (ESR < 100 mΩ). Figure 7 in the datasheet defines the stable COUT–ESR region, and no external compensation is needed, reducing design complexity and bill-of-materials count.

Does LD39015J12R support reverse current blocking?

No - the LD39015J12R does not integrate reverse current blocking. When VIN < VOUT, reverse current may flow through the internal pass transistor. For applications requiring backflow prevention (e.g., OR-ing configurations), an external Schottky diode or dedicated ideal diode controller is required.

What is the enable pin voltage threshold for shutdown activation?

The EN pin asserts shutdown when voltage falls below 0.4 V (max) over the full temperature range. Active mode begins at ≥0.9 V (min). This 0.5 V hysteresis ensures noise immunity and avoids chatter during slow-rising enable signals from microcontroller GPIOs.