STMicroelectronics LDK130PU18R

Overview

LDK130PU18R 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 LDK130PU18R datasheet, LDK130PU18R pinout, LDK130PU18R application, or LDK130PU18R equivalent, this page provides verified electrical characteristics, validated SOT23-5L terminal mapping, confirmed automotive-grade thermal performance (−40 °C to 125 °C), and real-world P.O.L. and ADAS use-case implementation guidance - all derived from ST's production datasheet DS9465 Rev 10.

Technical Context

The LDK130PU18R implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with 1 µF ceramic output capacitance. Its internal bandgap reference and error amplifier deliver tight line/load regulation (0.05 %/V and 0.006 %/mA) across −40 °C to 125 °C junction temperature.

Logic-controlled enable (EN) input supports system-level power sequencing with <0.4 V logic-low threshold and >1.2 V logic-high threshold; shutdown mode draws <1 µA total current. Integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typ.) ensure fault resilience in automotive environments.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.9 mm × 1.6 mm × 1.1 mm body, exposed thermal pad not present, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G, LDK130PU18R delivers 50% higher current and full AEC-Q100 Grade 1 compliance; versus ADP125ARHZ-1.8-R7, it offers superior high-temp operation and lower dropout - making it the sole choice for thermally demanding ADAS P.O.L. rails.

Availability

LDK130PU18R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, and body control module sensor interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LDK130PU18R 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 high-reliability point-of-load regulation in ADAS, infotainment, and powertrain systems where low noise, low I_Q, and AEC-Q100 compliance are mandatory.

FAQ

What is the exact output voltage tolerance of LDK130PU18R over temperature?

The LDK130PU18R has ±2.0% output voltage tolerance at 25 °C and ±3.0% over the full −40 °C to +125 °C operating junction temperature range, as specified in Table 4 of DS9465 Rev 10. This applies to the fixed 1.8 V version (PU18R suffix) under 1 mA load conditions.

Can LDK130PU18R operate with a 1 µF ceramic output capacitor without stability issues?

Yes - the LDK130PU18R is explicitly characterized and guaranteed stable with 1 µF ceramic output capacitors (X5R/X7R), as confirmed in Section 6 "Typical performance characteristics" and Figure 24 of DS9465 Rev 10. No minimum ESR requirement exists.

Is the BYP pin required for proper operation in the fixed-output version?

No - the BYP pin is optional on the fixed-output LDK130PU18R. When unused, it must be left floating with no PCB routing, as stated in Table 1 Pin Description. Adding a 10 nF capacitor improves noise performance but is not necessary for basic regulation.

Does LDK130PU18R support reverse polarity protection on its input pin?

No - the LDK130PU18R does not include reverse polarity protection. Absolute maximum rating for VIN is −0.3 V (Table 2), meaning any negative input voltage exceeding this threshold risks permanent damage. External protection diode or MOSFET-based reverse-voltage circuitry is required in systems prone to battery misconnection.