STMicroelectronics LDK130M25R

Overview

LDK130M25R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator in SOT23-5L package, delivering 300 mA output current with 100 mV typical dropout at 100 mA, ±2.0% output voltage accuracy at 25 °C, and 30 µA typical quiescent current. It serves as a precision post-regulator in battery-powered ADAS domain controllers and automotive point-of-load (P.O.L.) rails.

For engineers reviewing the LDK130M25R datasheet, LDK130M25R pinout, LDK130M25R application, or LDK130M25R equivalent, this page provides verified electrical specifications, validated SOT23-5L pin mapping, automotive-grade thermal performance data, and real-world P.O.L. implementation guidance for noise-sensitive 2.5 V rail generation.

Technical Context

The LDK130M25R implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with 1 µF ceramic output capacitance. Its internal bandgap reference and error amplifier maintain tight output regulation across -40 °C to 125 °C junction temperature.

Logic-controlled enable input (EN) supports system-level power sequencing, while integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typ.) ensure robust fault protection without external components.

Key Specifications

Pinout & Package

SOT23-5L package: 2.9 mm × 1.6 mm × 1.1 mm body, 0.95 mm pitch, thermally enhanced exposed pad (pin 5 N/C connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B25MR-G and NCP114AMX25T2G, the LDK130M25R uniquely combines AEC-Q100 Grade 1 qualification, 30 µA quiescent current, and 51 µV_RMS noise-making it the only choice for safety-relevant 2.5 V analog rails in ADAS and instrument cluster systems.

Availability

LDK130M25R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC I/O rails, and telematics RTC backup circuits requiring stable component supply with full AEC-Q100 traceability and long-term production commitment through July 2026.

Supply support for LDK130M25R 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 LDK130 series belongs to ST's automotive-qualified LDO portfolio, engineered specifically for low-noise, low-quiescent-current point-of-load regulation in safety-critical vehicle subsystems including ADAS, body electronics, and powertrain interfaces.

FAQ

What is the recommended output capacitor for LDK130M25R?

The LDK130M25R is stable with 1 µF to 22 µF ceramic capacitors (X5R/X7R dielectric). ST specifies 1 µF as minimum for stability across all operating conditions, and recommends placing it within 2 mm of the OUT and GND pins. Larger values (e.g., 10 µF) improve transient response but do not affect loop stability per Figure 24 in DS9465 Rev 10.

Does LDK130M25R require a bypass capacitor on the BYP pin?

No. The LDK130M25R is the fixed 2.5 V version; the BYP/ADJ pin (pin 4) must be left unconnected and un-routed per Table 1 of the datasheet. Adding a capacitor or trace to this pin may cause instability or regulation error. Only adjustable versions use this pin for feedback resistor networks.

How does thermal performance differ between SOT23-5L and DFN6 packages?

The SOT23-5L package has R_thJA = 160 °C/W, while DFN6 1.2×1.3 offers R_thJA = 237 °C/W - meaning the SOT23-5L dissipates heat more effectively in standard PCB layouts. However, DFN6 achieves lower R_thJC (104 vs. 68 °C/W), making it preferable when using thermal vias to an internal ground plane. Both meet AEC-Q100 thermal requirements.

Can LDK130M25R operate with input voltage below 2.5 V?

Yes - the LDK130M25R supports input voltages as low as 1.9 V. At VIN = 2.4 V, it delivers 2.5 V output with 100 mV dropout only if load current is ≤100 mA (per Figure 33). For 300 mA loads, VIN must be ≥2.7 V to maintain regulation, as dropout rises to 200–400 mV across temperature per Table 4.