STMicroelectronics LDK130PU08R

Overview

LDK130PU08R 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 operation from 1.9 V to 5.5 V input. It powers safety-critical ADAS domain controllers requiring ultra-low noise and stable 0.8 V core supply under wide temperature (-40 °C to 125 °C) and load transients.

For engineers reviewing the LDK130PU08R datasheet, LDK130PU08R pinout, LDK130PU08R application, or LDK130PU08R equivalent, this page provides verified package mapping (SOT23-5L), validated pin functions, confirmed automotive-grade thermal performance, and real-world design trade-offs versus alternative fixed-output LDOs in battery-powered ADAS and power management subsystems.

Technical Context

The LDK130PU08R implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 120 Hz–10 kHz (55 dB typ.). Its internal bandgap reference and error amplifier maintain tight output regulation over ±0.006 %/mA load change and ±0.05 %/V line variation, with logic-controlled enable input supporting fast startup (<10 µs) and sub-1 µA shutdown current.

Stabilized by a single 1 µF ceramic output capacitor, it features integrated thermal shutdown (160 °C trip, 20 °C hysteresis) and short-circuit current limiting (450 mA typ.), making it suitable for point-of-load regulation in space-constrained automotive modules where board area and thermal margin are critical.

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 connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D082MR-G, LDK130PU08R delivers 150 mV lower dropout and guaranteed automotive qualification; versus ADM7172ACPZ-R7, it offers +100 mA output and pin-compatible fixed 0.8 V output, reducing design validation overhead in volume ADAS production.

Availability

LDK130PU08R is available at Aetrix Electronics and suitable for ADAS camera modules, automotive infotainment SoC cores, and radar signal processors requiring stable component supply with full AEC-Q100 documentation and PPAP support.

Supply support for LDK130PU08R 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 power management applications.

The LDK130 series belongs to ST's automotive-qualified LDO portfolio, engineered specifically for low-noise, low-quiescent-current point-of-load regulation in ADAS, body electronics, and infotainment systems operating across extended temperature ranges.

FAQ

What is the minimum input voltage required for LDK130PU08R to maintain regulation at 300 mA load?

The minimum input voltage is calculated as V_OUT + V_DROP(max). At 300 mA and 125 °C, maximum dropout is 400 mV per Table 4, so minimum VIN = 0.8 V + 0.4 V = 1.2 V. However, the absolute minimum specified operating input is 1.9 V per datasheet Section 5, meaning reliable regulation at full load begins at 1.9 V regardless of theoretical dropout margin.

Can LDK130PU08R be used with a 2.2 µF ceramic output capacitor instead of the recommended 1 µF?

Yes. The stability region in Figure 24 shows that 2.2 µF falls well within the stable C_OUT range (1–22 µF) for fixed versions. Using 2.2 µF improves load transient response and further reduces output impedance at higher frequencies without compromising phase margin or causing oscillation.

Is the BYP pin mandatory for noise reduction in LDK130PU08R?

No. The BYP pin is optional: a 10 nF capacitor here reduces output noise by ~30% (per Figure 22 vs. Figure 23), but the device meets all specifications without it. If omitted, the pin must be left unconnected-no routing or grounding is required, simplifying layout for cost-sensitive designs.

Does LDK130PU08R support reverse polarity protection on the input pin?

No. The absolute maximum rating for V_IN is -0.3 V (Table 2); applying reverse voltage will damage the internal PMOS pass device. External protection-such as a series Schottky diode or ideal diode controller-is required in systems where input polarity reversal is possible, e.g., during service or battery replacement.