STMicroelectronics LDK130M33R

Overview

LDK130M33R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator delivering 300 mA output current with 100 mV typical dropout at 100 mA, 30 µA typical quiescent current, ±2.0% output voltage accuracy at 25 °C, and 51 µV_RMS output noise (10 Hz–100 kHz) - deployed in ADAS power rails and automotive point-of-load systems.

For engineers reviewing the LDK130M33R datasheet, LDK130M33R pinout, LDK130M33R application, or LDK130M33R equivalent, this page delivers verified package mapping (SOT23-5L), validated pin functions, confirmed thermal performance (−40 °C to 125 °C), and real-world substitution guidance for automotive-grade LDO selection.

Technical Context

The LDK130M33R 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 regulation across load (1–300 mA) and input voltage (1.9–5.5 V) variations.

Logic-controlled enable (EN) pin provides precise shutdown with sub-1 µA total current consumption; integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typ.) ensure robust fault protection in automotive environments.

Key Specifications

Pinout & Package

SOT23-5L is a 5-pin, leaded plastic package with 0.95 mm pitch, optimized for thermal performance (R_thJA = 160 °C/W) and space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and ADM7172ACPZ-3.3-R7, the LDK130M33R uniquely combines AEC-Q100 Grade 1 certification, 100 mV dropout, and 1 µF ceramic compatibility - making it the only drop-in solution for space-constrained, noise-sensitive automotive POE rails requiring full qualification.

Availability

LDK130M33R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment core rails, and body control unit sensor interfaces requiring stable component supply across extended product lifecycles.

Supply support for LDK130M33R 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 specializing in automotive, industrial, and power management solutions, with over 40 years of analog IC design heritage.

The LDK130 series targets automotive point-of-load regulation, emphasizing ultra-low noise, AEC-Q100 compliance, and ceramic capacitor compatibility for next-generation ADAS and electrification systems.

FAQ

What is the maximum input voltage the LDK130M33R can tolerate?

The absolute maximum DC input voltage is 7 V, but the recommended operating range is 1.9 V to 5.5 V. Exceeding 5.5 V risks violating safe operating area limits and may trigger thermal shutdown even at light loads. Operation above 5.5 V is not guaranteed and voids AEC-Q100 qualification compliance.

Can the LDK130M33R be used with a 0.47 µF output capacitor?

No - the datasheet specifies a minimum 1 µF ceramic output capacitor for stability across all operating conditions. Using 0.47 µF risks oscillation or poor transient response, especially at high load currents (>200 mA) or elevated temperatures. The stability region chart (Figure 24) confirms 1 µF as the lower bound.

Does the BYP pin require a capacitor for basic functionality?

No - the BYP pin is optional on the fixed-output LDK130M33R. It may be left unconnected (floating) with no routing on the PCB. A 10 nF capacitor is only needed when ultra-low noise (<30 µV_RMS) is required; omitting it reduces component count without affecting regulation accuracy or stability.

How does the LDK130M33R behave during cold-crank conditions?

At 1.9 V input (minimum specified VIN), the LDK130M33R maintains 3.3 V output up to 100 mA load with 100 mV dropout margin. Below 1.9 V, output collapses linearly - it does not brown-out or latch. This behavior is validated across −40 °C to 125 °C and supports ISO 16750-2 cold-crank profiles when paired with appropriate input staging.