STMicroelectronics LDK130PU-R

Overview

LDK130PU-R 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, 30 µA typical quiescent current, ±2.0% output voltage accuracy at 25 °C, and operation across -40 °C to 125 °C ambient. It serves as a precision power rail for ADAS sensor modules and automotive point-of-load (P.O.L.) systems requiring ultra-low noise and shutdown capability.

For engineers reviewing the LDK130PU-R datasheet, LDK130PU-R pinout, LDK130PU-R application, or LDK130PU-R equivalent, key selection criteria include its guaranteed 300 mA load capability under automotive temperature extremes, logic-controlled enable function with <1 µA shutdown current, compatibility with 1 µF ceramic output capacitors, and validated stability with optional 10 nF bypass capacitor for noise-sensitive analog rails.

Technical Context

The LDK130PU-R employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero ground current variation across load. Its internal bandgap reference and error amplifier deliver tight output regulation with ±2.0% initial tolerance and <0.006 %/mA static load regulation over full temperature range.

It integrates logic-level enable control (V_EN high threshold ≥1.2 V, low ≤0.4 V), thermal shutdown at 160 °C with 20 °C hysteresis, and short-circuit current limiting (~450 mA). The device achieves 55 dB supply voltage rejection from 120 Hz to 10 kHz and 51 µV_RMS output noise (10 Hz–100 kHz) when configured with 10 nF bypass capacitor on fixed versions.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.9 mm × 1.6 mm × 1.1 mm body, 0.95 mm pitch, exposed thermal pad not present. Compatible with standard reflow profiles and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS78033QDRVRQ1 and NCP114AMX330TBG, the LDK130PU-R uniquely combines AEC-Q100 Grade 1 qualification, 51 µV_RMS noise with bypass support, and ±2.0% accuracy - making it the only choice for safety-critical ADAS imaging and GNSS power domains.

Availability

LDK130PU-R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC core rails, and telematics GNSS RF supplies requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LDK130PU-R 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, and automotive-grade analog devices since 1987.

The LDK130 series belongs to ST's automotive-qualified LDO portfolio, engineered specifically for demanding point-of-load regulation in ADAS, body electronics, and infotainment systems where low noise, ultra-low IQ, and AEC-Q100 reliability are mandatory.

FAQ

What is the maximum output current capability of the LDK130PU-R across temperature?

The LDK130PU-R guarantees 300 mA output current over the full -40 °C to +125 °C ambient temperature range, verified per AEC-Q100 stress testing. At 125 °C ambient, thermal derating is not required due to its 104 °C/W junction-to-case thermal resistance in SOT23-5L and integrated thermal shutdown at 160 °C with 20 °C hysteresis.

Can the LDK130PU-R be used with a 1 µF ceramic output capacitor without stability issues?

Yes - the LDK130PU-R is explicitly characterized and guaranteed stable with a 1 µF X5R or X7R ceramic output capacitor (ESR < 1 Ω), as confirmed in Figure 24 of DS9465 Rev 10. No additional series resistance or compensation network is required, simplifying layout and reducing BOM count versus older LDOs needing tantalum or electrolytic capacitors.

How does the BYP/ADJ pin function in the fixed-output LDK130PU-R variant?

In the fixed-output LDK130PU-R, pin 4 is labeled BYP and serves as a bypass node for a 10 nF ceramic capacitor to GND, reducing output noise by >20 dB in the 10 Hz–100 kHz band. If unused, this pin must remain floating with no PCB routing - it is not connected internally and must not be tied to GND or OUT.

Is the LDK130PU-R pin-compatible with other ST LDOs in SOT23-5L package?

No - the LDK130PU-R has a unique pinout: IN (1), GND (2), EN (3), BYP/ADJ (4), OUT (5). This differs from ST's LD39050 (IN, GND, EN, OUT, NC) and LD39200 (IN, GND, EN, OUT, FB), making direct replacement impossible without PCB redesign. Pin mapping is validated in Table 1 and Figure 2 of DS9465 Rev 10.