STMicroelectronics LDK130PU29R

Overview

LDK130PU29R 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 from 1.9 V to 5.5 V input. It powers safety-critical ADAS domain controllers requiring ultra-low noise and stable PoL regulation under wide temperature (-40 °C to 125 °C).

For engineers reviewing the LDK130PU29R datasheet, LDK130PU29R pinout, LDK130PU29R application, or LDK130PU29R equivalent, this page delivers verified electrical specs, validated SOT23-5L terminal mapping, confirmed automotive-grade thermal and shutdown behavior, and real-world PoL use cases for battery-powered ADAS modules.

Technical Context

The LDK130PU29R implements a PMOS pass transistor architecture enabling ultra-low dropout and near-zero gate-drive current, supporting stable regulation down to 1.9 V input while maintaining 300 mA output capability. Its internal bandgap reference and error amplifier deliver ±2.0% initial output tolerance and <0.006 %/mA load regulation over full temperature range.

Logic-controlled enable (EN) pin provides clean 1 µA shutdown current, while integrated thermal foldback and constant-current short-circuit protection operate without external components. The device achieves 55 dB supply voltage rejection from 120 Hz to 10 kHz and 51 µV_RMS output noise (10 Hz–100 kHz) with 10 nF bypass capacitor.

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, connect to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B292MR-G and ADM7172ACPZ-2.9-R7, the LDK130PU29R uniquely combines 300 mA drive, 100 mV dropout, AEC-Q100 Grade 1, and SOT23-5L footprint-enabling compact, high-reliability PoL in space-constrained ADAS ECUs where thermal and noise margins are critical.

Availability

LDK130PU29R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, electric power steering systems, and infotainment SoC core rails requiring stable component supply across extended temperature and long production lifecycles.

Supply support for LDK130PU29R 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 automotive-grade analog products since 1987.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for power integrity in ADAS, body electronics, and infotainment systems where low noise, high PSRR, and AEC-Q100 compliance are mandatory.

FAQ

What is the maximum allowable output capacitance for stable operation of LDK130PU29R?

The LDK130PU29R supports output capacitors from 1 µF to 22 µF with ESR ≤10 Ω at 100 kHz. Stability is guaranteed across this range for both fixed and adjustable versions when using X5R/X7R ceramic types. Larger values may cause phase margin degradation; refer to Figure 24 and Figure 25 in DS9465 Rev 10 for exact COUT–ESR boundaries.

Does LDK130PU29R require a bypass capacitor on the BYP pin for fixed-output variants?

A 10 nF ceramic bypass capacitor on the BYP pin is optional for fixed-output versions and reduces output noise by ~30%. If omitted, the BYP pin must be left unconnected-no routing or stubs-to prevent parasitic coupling. The device remains fully functional and stable without it, as confirmed in Table 1 and Section 3 of DS9465 Rev 10.

Can LDK130PU29R operate with input voltage below 1.9 V?

No. Absolute maximum ratings specify minimum VIN = −0.3 V, but functional operation begins at 1.9 V per Table 4. Below this, regulation fails: output collapses, dropout increases nonlinearly, and quiescent current rises unpredictably. For sub-1.9 V inputs, consider ST's STLQ015 or alternative ultra-low-VIN LDOs-not LDK130PU29R.

How does thermal shutdown hysteresis affect recovery behavior after overtemperature event?

LDK130PU29R shuts down at 160 °C junction temperature and resumes regulation only after cooling to 140 °C (20 °C hysteresis). This prevents rapid cycling during transient overloads. Recovery is automatic-no reset pulse or EN toggle required-and output re-establishes within 100 µs once T_J falls below 140 °C, as validated in Figure 33–34 and Table 3.