STMicroelectronics LDK130M18RY

Overview

LDK130M18RY 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, ±2.0% output voltage tolerance at 25 °C, and 30 µA typical quiescent current. It powers safety-critical ADAS domain controllers and automotive point-of-load (P.O.L.) rails where ultra-low noise and thermal robustness are required.

For engineers reviewing the LDK130M18RY datasheet, LDK130M18RY pinout, LDK130M18RY application, or LDK130M18RY equivalent, this page delivers verified electrical specs, validated SOT23-5L pin mapping, automotive-grade thermal performance data, and real-world P.O.L. implementation guidance - all extracted from ST's production datasheet DS9465 Rev 10.

Technical Context

The LDK130M18RY implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with 1 µF ceramic output capacitors. Its internal bandgap reference and error amplifier maintain tight regulation across -40 °C to 125 °C junction temperature range while supporting logic-controlled shutdown via dedicated EN pin.

It integrates thermal shutdown with 160 °C trip point and 20 °C hysteresis, plus short-circuit current limiting (450 mA typ.), ensuring fault resilience in automotive environments. The fixed 1.8 V output version eliminates external feedback components and reduces PCB footprint versus adjustable variants.

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 connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G, LDK130M18RY delivers 50% higher current and full automotive qualification; versus ADP7102ARDZ-1.8-R7, it trades 41 µV_RMS extra noise for 100 mA more output and 35% smaller PCB area in SOT23-5L.

Availability

LDK130M18RY is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC core rails, and telematics RTC backup systems requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for LDK130M18RY 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-optimized LDO portfolio, engineered specifically for demanding point-of-load regulation in ADAS, body electronics, and infotainment systems where low noise, low IQ, and AEC-Q100 compliance are mandatory.

FAQ

What is the minimum input voltage required for LDK130M18RY to maintain 1.8 V output at 300 mA?

The minimum input voltage is determined by dropout voltage. At 300 mA and 125 °C, maximum dropout is 400 mV per Table 4. Therefore, minimum VIN = 1.8 V + 0.4 V = 2.2 V. At room temperature and 100 mA, typical dropout is 100 mV, allowing VIN as low as 1.9 V - matching the device's specified 1.9 V lower input limit.

Can LDK130M18RY operate with a 0.47 µF output capacitor?

No. The datasheet specifies minimum COUT = 1 µF for stability (Section 6, Figures 24–25). Using 0.47 µF risks oscillation due to insufficient phase margin, especially under load transients. ST validates stability only within 1–22 µF range with ESR ≤ 10 Ω - 0.47 µF falls outside this region and is not recommended.

Is the BYP pin on LDK130M18RY required to be connected?

No. The BYP pin is optional for noise reduction: a 10 nF capacitor between BYP and GND lowers output noise by ~30%. If omitted, the pin must be left floating with no PCB trace - not tied to GND or OUT. This is explicitly stated in Table 1: "if not used the relevant pin must be left floating with no routing on the board."

Does LDK130M18RY support reverse polarity protection on the input?

No. The device lacks integrated reverse-voltage protection. Absolute maximum rating for VIN is -0.3 V (Table 2); applying reverse polarity will damage the internal PMOS pass element. External protection - such as a series Schottky diode or ideal diode controller - must be added if reverse input is possible in the application.