STMicroelectronics LDK130M29R

Overview

LDK130M29R 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 tolerance at 25 °C, and operation from 1.9 V to 5.5 V input. It powers ADAS domain controllers requiring ultra-low noise and stable PoL regulation under cold-crank conditions.

For engineers reviewing the LDK130M29R datasheet, LDK130M29R pinout, LDK130M29R application, or LDK130M29R equivalent, this page delivers verified electrical specs, validated SOT23-5L terminal mapping, automotive-grade thermal performance data, and real-world PoL use-case context for battery-powered safety-critical systems.

Technical Context

The LDK130M29R implements a PMOS pass transistor architecture enabling ultra-low dropout and near-zero gate-drive current dependency, supporting stable regulation down to 1.9 V input. Its internal bandgap reference and error amplifier deliver ±2.0% output accuracy over temperature and load, with integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typical).

Logic-controlled enable functionality provides <1 µA shutdown current, while compatibility with 1 µF ceramic output capacitors simplifies layout in space-constrained automotive modules. The device's 51 µV_RMS output noise (10 Hz–100 kHz) and 55 dB supply voltage rejection (120 Hz–10 kHz) meet stringent requirements for image sensor and radar SoC power rails.

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 tied 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 NCP114AMX290TBG, the LDK130M29R uniquely combines AEC-Q100 Grade 1 qualification, 300 mA output, sub-100 mV dropout, and 51 µV_RMS noise - making it the only validated choice for safety-critical automotive PoL where thermal margin, noise immunity, and functional safety compliance are mandatory.

Availability

LDK130M29R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, electric power steering sensor interfaces, and infotainment system core rails requiring stable component supply across extended temperature and lifecycle demands.

Supply support for LDK130M29R 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, ultra-low IQ, and AEC-Q100 reliability are non-negotiable.

FAQ

What is the exact output voltage of LDK130M29R?

The "M29R" suffix denotes a fixed 2.9 V output version, confirmed by STMicroelectronics' official order code documentation (DS9465 Rev 10, Table 11). Output voltage tolerance is ±2.0% at 25 °C and ±3.0% across −40 °C to +125 °C operating range, with line/load regulation of 0.05 %/V and 0.006 %/mA respectively.

Can LDK130M29R operate with a 1.8 V input supply?

No - the absolute minimum input voltage is 1.9 V per datasheet Table 2 (VIN: −0.3 V to 7 V), and functional operation requires VIN ≥ VOUT + VDROP. At 2.9 V output and 100 mV typical dropout, minimum valid input is 3.0 V under nominal load; at 300 mA, dropout rises to 200–400 mV, requiring ≥3.1 V input. Operation below 1.9 V risks undefined behavior or shutdown.

Is an external bypass capacitor required on the BYP pin for LDK130M29R?

No - the BYP pin is optional for fixed-output versions like LDK130M29R. When unused, it must be left floating with no PCB routing (per Table 1 pin description). Adding a 10 nF capacitor reduces output noise to 51 µV_RMS, but the regulator remains fully functional without it. For noise-critical imaging rails, ST recommends using the capacitor; for general logic rails, it may be omitted.

Does LDK130M29R support reverse polarity protection?

No - the device lacks integrated reverse-voltage protection. Absolute maximum rating for input voltage includes −0.3 V (Table 2), meaning brief negative transients below GND may not cause immediate failure, but sustained reverse bias will damage the internal PMOS pass device. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems prone to battery misconnection or load-dump reversal.